- 22 December, 2024
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- ONECSIR
| Designation: |
Chief Scientist & Head
|
| Email Id: | s_basha[at]neeri[dot]res[dot]in |
| Qualification: |
M.E, Ph.D (Chemical Engg.) |
| Specialization: |
Environmental Chemical Engineering
|
| Address: |
CSIR-NEERI, Hyderabad Zonal Centre, Tarnaka, Uppal Road, Hyderabad-500007
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| Biodata: |
-
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| Sr. No. | Project Name |
|---|---|
| 1 |
Environmental Assessment of ARCI Complex as per TSPCB Consent Order
M/s. ARCI retained CSIR-NEERI for conducting an environmental assessment study with reference to the consent order given by TSPCB. CSIR-NEERI Hyderabad zonal centre conducted an environmental assessment study for the assessment of impacts due to the identified sources on various environmental components like air, noise and water/wastewater within the ARCI campus. Based on the existing environmental data and the information given by the ARCI, evaluated and predicted environmental impacts and prepared environmental management plan. |
| 2 |
EIA for Strengthening/Re-construction of Jetties at Eastern Naval Command, Visakhapatnam
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| 3 |
Ground Water Quality Modelling and Contamination Assessment in Choutuppal Industrial Area
Assessment of groundwater quality, surface water quality and soil quality has been carried out in and around the Choutuppal industrial area during April 2016. Groundwater modelling and contamination assessment has been carried out based on both primary and secondary data collected during the study period. Remedial measures have been suggested to minimize the contamination of ground water. |
| Sr. No. | Publication Name |
|---|---|
| 1 |
Hexabromocyclododecane in the environment –Issues and Challenges
The brominated flame retardant, hexabromocyclododecane (HBCD) is extensively used in Europe, and to smaller extent in India, has become of increasing concern to scientists over the past decade. HBCD is not produced in India and the current industrial use-is moderate. Possible emission sources of this chemical in India were identified through a systematic analysis of the use in a life cycle perspective. The information on the environmental concentrations of HBCD is scarce. Environmental studies conducted primarily in Europe, Japan and North America indicates that HBCDs are ubiquitous in sediment and biota. The levels of HBCD seem to be increasing and several trends indicate that this increase may be rapid. The relatively high concentrations detected in herring and foodstuffs provide evidence for bioaccumulation of HBCD. The presence of HBCD in remote background air implies that HBCD has potential for long-range atmospheric transport. The occurrence of high concentrations of HBCD may be sufficient to elicit adverse effects in some wildlife. There is also concern that levels of HBCD could cause adverse effects in sensitive human populations, such as young children, indigenous peoples, and fish consumers. However, our knowledge about these chemicals, their sources, environmental behaviour, and toxicity is limited, making risk assessment difficult. In this paper, the current state of knowledge about HBCD is reviewed and areas for further research recommended for improving future monitoring and risk assessment efforts. |
| 2 |
On the biosorption, by brown seaweed, Lobophora variegata, of Ni(II) from aqueous solutions: Equilibrium and thermodynamic studies
The biosorption equilibrium isotherms of Ni(II) onto marine brown algae Lobophora variegata, which was chemically-modified by CaCl(2) were studied and modeled. To predict the biosorption isotherms and to determine the characteristic parameters for process design, twenty-three one-, two-, three-, four- and five-parameter isotherm models were applied to experimental data. The interaction among biosorbed molecules is attractive and biosorption is carried out on energetically different sites and is an endothermic process. The five-parameter Fritz-Schluender model gives the most accurate fit with high regression coefficient, R (2) (0.9911-0.9975) and F-ratio (118.03-179.96), and low standard error, SE (0.0902-0.0.1556) and the residual or sum of square error, SSE (0.0012-0.1789) values to all experimental data in comparison to other models. The biosorption isotherm models fitted the experimental data in the order: Fritz-Schluender (five-parameter) > Freundlich (two-parameter) > Langmuir (two-parameter) > Khan (three-parameter) > Fritz-Schluender (four-parameter). The thermodynamic parameters such as DeltaG (0), DeltaH (0) and DeltaS (0) have been determined, which indicates the sorption of Ni(II) onto L. variegata was spontaneous and endothermic in nature. |
| 3 |
Assessment of heavy metal content in suspended particulate matter of coastal industrial town, Mithapur, Gujarat, India
Heavy metal concentrations in suspended particulate matter (SPM) were investigated for their distribution and source in the atmosphere of coastal industrial town, Mithapur, Gujarat, India. SPM, at 10 locations covering three seasons, were trapped on glass fibre filters using high volume samplers and quantification of metals (Cd, Co, Cr, Cu, Fe, Mn, Ni, Pb and Zn) was done using Atomic Absorption Spectrometry employing HNO3 based wet digestion. Results show relatively low concentrations of SPM (211.3 to 375.2 ?g/m3) compared to National Ambient Air Quality Standard (NAAQS), specified By Central Pollution Control Board (CPCB, India), however, they were 2–3 times higher as compared to reference site. Among the heavy metals Cr, Mn and Pb levels were low, while Ni and Cd found to be exceeding the USEPA standards. The metal levels were also compared with those reported for other rural, coastal, industrial and urban parts around the world. Enrichment Factor analysis indicated that Cd, Zn, Cu, Pb and Ni were highly enriched relative to their crustal ratios (to Fe) and correspond to substantial contribution of anthropogenic source of these metals. The source identification was carried out by principal component analysis by applying a Varimax Rotated Component Matrix. |
| 4 |
Studies on the adsorption and kinetics of photodegradation of pharmaceutical compound, Indomethacin using novel photocatalytic adsorbents IPCAs
Integrated photocatalytic adsorbents (IPCAs) based on TiO2-activated carbon synthesized by an ultrasonic impregnation technique have been used for the photodegradation of indomethacin (IND) in aqueous solutions. The IPCAs in dark adsorption studies had high affinity toward IND with the amount adsorbed proportional to the TiO2 loading. The adsorption capacity increased from 0.597 to 0.657 mmol/g with increase in TiO2 content from 0.5 to 10% in IPCAs. Three adsorption models, Langmuir, Freundlich and Sips, were used to describe the adsorption isotherms while the adsorption kinetic data were fitted to pseudofirst order and pseudosecond order models. The adsorption isotherm study showed that the adsorption followed both Sips and Langmuir models with high regression coefficients (R2) and low standard error (SE) and sum of residual square error (SSE) values. The adsorption kinetic data are well represented by pseudosecond order model. The kinetics of photocatalytic degradation under UV were found to follow a Langmuir?Hinshelwood model for the various IPCAs. The adsorption rate constant (Kads) was considerably higher than the photocatalytic rate constant (kL-H), suggesting that the photocatalysis of IND is the rate-determining step during the adsorption/photocatalysis process. The proportion of TiO2 played a significant role upon the photoefficiency of the IPCAs. The photocatalytic efficiency of the 10% TiO2 IPCA remained greater than 70% after five cycles of use. |
| 5 |
Equilibrium modeling for biosorption of safranin onto chemically modified biomass of marine Aspergillus wentii
Safranin was used as a model reactive dye for biosorption studies onto various forms of chemically modified biomass of Aspergillus wentii. The experimental equilibrium data was analyzed by various single-, two-, three-, four-, and five-parameter isotherms to understand the biosorption process. Biosorption isotherms modeling shows that the interaction of safranin with A. wentii surface is localized monolayer sorption. Results show that in general the accuracy of models to fit experimental data improves with the degree of freedom. The interaction among adsorbed molecules is repulsive having no association between them and sorption is carried out on energetically different sites and is an endothermic process. The five-parameter Fritz–Schluender model gives the most accurate fit with high regression coefficients (0.9902–0.9941), low standard errors (0.0389–0.0758), and sum of squares error (0.0075–0.0230) values to all experimental data in comparison to other models. The results disclose that the sorption isotherm models fitted the experimental data in the order: Fritz–Schluender (five-parameter) > Langmuir > Khan > Fritz–Schluender (four-parameter) > Temkin. This systematic evaluation of the more important equilibrium isotherm models provided the general basis for making a preliminary selection of an effective model for a given application. |
| 6 |
Kinetics, Isotherms and Thermodynamics for the biosorption of Hg(II) onto Carica papaya
Carica papaya, a novel sorbent, was evaluated for sorption of Hg(II) from synthetic aqueous solutions using various pseudo-second order kinetic models as well as equilibrium sorption models. Batch kinetic and equilibrium experiments were carried out for the sorption of Hg(II) onto C. papaya at pH 6.5 and solid to liquid ratio (s/l) 1.0 g L?1. The kinetic data were fitted to second order models of Sobkowsk and Czerwinski, Ritchie, Blanchard, Ho and McKay, whereas Langmuir, Freundlich, and Redlich-Peterson models were used for the equilibrium data. A comparative study on both linear and nonlinear regression showed that the Sobkowsk and Czerwinski and Ritchie's second order model were the same. Ho and McKay's pseudo-second order model fitted well to the experimental data when compared with the other second order kinetic expressions. Langmuir isotherm parameters obtained from the four Langmuir linear equations by using linear method were dissimilar, but were the same when nonlinear method was used. Additionally, various thermodynamic parameters, such as ?G 0, ?H 0, and ?S 0, were calculated. The negative values of Gibbs free energy (?G 0) and ?H 0 confirmed the intrinsic nature of biosorption process and exothermic, respectively. The negative value of ?S 0 showed the decreased randomness at the solid-solution interface during biosorption. |
| 7 |
Biosorption of safranin onto chemically modified biomass of marine Aspergilluswentii: A kinetic study
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| 8 |
Photodegradation of famotidine by integrated photocatalytic adsorbent (IPCA) and kinetic study,
Integrated photocatalytic adsorbents (IPCAs) comprised of nanocrystalline titanium dioxide (TiO2) and activated carbon (AC) were prepared using an ultrasonic impregnation technique. The IPCAs were characterised by scanning electron microscopy (SEM) and Fourier-transform infrared (FT-IR) spectroscopy and were employed as catalysts for the photodegradation of famotidine-an active pharmaceutical ingredient-in aqueous solutions using illumination from a 125 W medium pressure mercury lamp. The degradation kinetics were found to follow a pseudo-first-order rate law and varying TiO2 loadings induced different increases in the apparent first-order rate constant of the process. The kinetic behaviour can be described in terms of a modified Langmuir–Hinshelwood (LH) model. The IPCA prepared using a 10% TiO2 to AC loading exhibited the highest rate constant with a K C and k r of 0.0172 L/mg and 0.237 mg/L/min, respectively. The LH model fits the experimental data and elucidates the effect of the TiO2 content of the IPCA on the degradation rate. The use of calcination (heat treatment) in IPCA preparation and its effect on photocatalytic and adsorption performance were also investigated. The present work demonstrates that the combination of TiO2 and AC results in a promising material for application in the degradation of organic pollutants. |
| 9 |
On the adsorption/photodegradation of Amoxicillin in aqueous solutions by an integrated photocatalytic adsorbent (IPCA): Experimental studies and kinetics analysis
Activated carbon-supported TiO(2) nanoparticles, termed integrated photocatalytic adsorbents (IPCAs), were prepared using an ultrasonic impregnation technique and investigated for the photocatalytic degradation of amoxicillin (AMO), a ?-lactam antibiotic. The IPCAs had high adsorption affinity for AMO with the amount adsorbed proportional to the TiO(2) loading and the highest adsorption was at 10 wt% TiO(2) loading. A pseudo-second-order model was found to fit the experimental data and consistently predicted the amount of AMO adsorbed over the adsorption period. Equilibrium isotherm studies showed that the adsorption followed the Redlich-Peterson model with maximum adsorption capacity of 441.3 mg g(-1) for 10% IPCA, 23% higher than the pure activated carbon (AC). Kinetic studies on the photocatalytic degradation of AMO using non-linear regression analysis suggest that the degradation followed Langmuir-Hinshelwood (L-H) kinetics. The adsorption rate constant (K(ad)) was considerably higher than the photocatalytic rate constant (k(L-H)), indicating that the photocatalysis of AMO is the rate-determining step during the adsorption/photocatalysis process. The 10% IPCA exhibited excellent stability and reusability over four photodegradation cycles. |
| 10 |
Occurrence of pharmaceutical compounds in wastewater process streams in Dublin, Ireland
The aim of this work is to establish baseline levels of pharmaceuticals in three wastewater treatment plant (WWTP) streams in the greater Dublin region to assess the removal efficiency of the selected WWTPs and to investigate the existence of any seasonal variability. Twenty compounds including several classes of antibiotics, acidic and basic pharmaceuticals, and prescribed medications were selected for investigation using a combination of membrane filtration, solid phase extraction (SPE) cleanup, and liquid chromatography-electrospray ionization tandem mass spectrometry. Fourteen of the selected compounds were found in the samples. Increased effluent concentrations, compared to influent concentrations, for a number of compounds (carbamazepine, clotrimazole, propranolol, nimesulide, furosemide, mefenamic acid, diclofenac, metoprolol, and gemfibrozil) were observed. The detected concentrations were generally below toxicity levels and based on current knowledge are unlikely to pose any threat to aquatic species. Mefenamic acid concentrations detected in both Leixlip and Swords effluents may potentially exert ecotoxicological effects with maximum risk quotients (i.e., ratio of predicted exposure concentration to predicted no effect concentration) of 4.04 and 1.33, respectively. |
| 11 |
Treatment options for wastewater from pharmaceutical companies: a review
" In recent years, concerns about the occurrence and fate of active pharmaceutical ingredients, solvents, intermediates and raw materials that could be present in water and wastewater including pharmaceutical industry wastewater has gained increasing attention. Traditional wastewater treatment methods, such as activated sludge, are not sufficient for the complete removal of active pharmaceutical ingredients and other wastewater constituents from these waters. As a result, complementary treatment methods such as membrane filtration, reverse osmosis and activated carbon are often used in conjunction with the traditional methods for treatment of industrial wastewater. Most of the literature published to date has been on the treatment of municipal wastewater. However, there is a growing body of research that looks at the presence of active pharmaceutical ingredients in industrial wastewater, the treatment of these wastewaters and the removal rates. This article, reviews these treatment methods and includes both traditional methods and advanced oxidation processes. The paper concludes by showing that the problem of pharmaceuticals in wastewaters cannot be solved merely by adopting end of pipe measures. At source measures, such as replacement of critical chemicals, reduction in raw material consumption should continue to be pursued as the top priority" |
| 12 |
Novel integrated photocatalytic adsorbents (IPCAs) for degradation of pharmaceuticals from water and wastewater
The presence of pharmaceuticals and personal care products in the aquatic environment and their possible effects on living organisms has emerged as a serious environmental concern. There is an increasing need for a cost- and energy-effective clean technology for the removal and degradation of organic compounds before they find their way into ground water wells and surface waters. Photocatalysis using cheap and non-toxic TiO2 has been recently used to degrade pharmaceuticals and pesticides in water, and was found to be superior to conventional methods. However, large scale application has been hindered by problems associated with its preferential use in slurry form and the high cost of radiation of large slurry volumes. Therefore, it is proposed to combine ell-established adsorption on activated carbon with rather novel TiO2 photocatalysis. This strategy will lead to the development of TiO2-coated activated carbon materials, i.e. integrated photocatalytic adsorbents (IPCAs). |
| 13 |
Efficient removal of Brilliant Blue G (BBG) from aqueous solutions by marine Aspergillus wentii: Kinetics, equilibrium and process design
The sorption of Brilliant Blue G (BBG) by dead biomass of marine fungus Aspergillus wentii, which was chemically modified by esterification of the carboxylic acids (CB), or methylation of amine (NB), or raw biomass (RB) was studied with variation in the parameters of contact time (0–80 min), initial concentration of dye (119.3–544.8 mg/L) and solution pH (2–10). The contact time necessary to reach equilibrium was 180 min. The BBG biosorption was strictly pH dependent, and maximum uptake capacity of all three biosorbents was observed at initial pH 2. The biosorption isotherm data were fitted well to the Langmuir isotherm and the monolayer sorption capacity was found to be 384.6, 370.4 and 312.5 mg/g for CB, NB and RB, respectively. For each biosorbent-dye system, kinetic models were applied to the experimental data to examine the mechanisms of sorption and potential rate-controlling steps. The pseudo-second-order kinetic model described the biosorption kinetics accurately and the sorption process was found to be controlled by pore and surface diffusion. From the design of a single-batch biosorber it is predicted that the biosorbent, CB will require 20% less of the sorbent to treat certain volumes of wastewater containing 500 mg/L of BBG when compared with the unmodified biosorbent (RB). |
| 14 |
Biosorption of ammoniacal nitrogen (N-NH4+) from aqueous solutions with low cost biomaterials: Kinetics and optimization of contact time
The biosorption of ammoniacal nitrogen (NNH4 ) from aqueous solutions by dead biomass of brown seaweed Cystoseira indica and Jatropha oil cake (JOC), which is generated in the process of biodiesel recovery from its seeds, was studied under diverse experimental conditions. The N-NH4 biosorption was strictly pH dependent, and maximum uptake capacity of C. indica (15.21 mg/g) and JOC (13.59 mg/g) was observed at initial pH 7 and 3, respectively. For each biosorbent–N-NH4 system, kinetic models were applied to the experimental data to examine the mechanisms of sorption and potential rate-controlling steps. The generalized rate model and pseudo-second-order kinetic models described the biosorption kinetics accurately, and the sorption process was found to be controlled by pore and surface diffusion for these biosorbents. Results of four-stage batch biosorber design analysis revealed that the required time for the 99 % efficiency removal of 40 mg/L N-NH4 from 500 L of aqueous solution were 76 and 96 min for C. indica and JOC, respectively. The Fourier transform infrared spectroscopy analysis before and after biosorption of ammonium onto C. indica and JOC revealed involvement of carboxylic and hydroxyl functional groups. |
| 15 |
Occurrence and distribution of selected heavy metals and boron in ground water of Gulf of Khambhat region, Gujarat, India
The concentration of selected heavy metals, like As, Co, Cr, Cu, Fe, Mn, Ni, Pb, and Zn as well as B, was measured by inductively coupled plasma-optical emission spectrometry (ICP-OES) in groundwater samples from various locations in the Gulf of Khambhat (GoK), an inlet of the Arabian Sea in the state of Gujarat, India, during post-monsoon, winter, and pre-monsoon seasons in a year. Most heavy elements are characterized by low mobility under slightly alkaline and reducing conditions; concentrations in confined aquifers are smaller than the maximum permissible values for drinking water. The temporal changes indicate that a majority of metals is entering the aquifer during monsoon. Principle component analysis of the heavy metal data suggests that Co, Cu, Cd, and Zn are interrelated with each other and derived significantly from anthropogenic route, while input of Pb and Cr may be due to atmospheric deposition in the study area. Both weathering of rocks and anthropogenic input were found to be main sources of elements in the groundwater. The heavy metal levels in groundwaters of the GoK region in comparison with some of the European and Asian sites were higher; however, these metal levels were found to be comparable with few urban sites in the world. |
| 16 |
Water pollution of Sabarmati River- A Harbinger to Potential Disaster
River Sabarmati is one of the biggest and major river of Gujarat that runs through two major cities of Gujarat, Gandhinagar and Ahmedabad and finally meets the Gulf of Khambhat (GoK) in the Arabian Sea. A study was conducted to evaluate the water quality of this river, as it could possibly be one of the major sources for filling up Kalpasar, the proposed man-made freshwater reservoir supposed to be the biggest one in the world. A total of nine sampling stations were established covering 163 km stretch of the river from upstream of Gandhinagar city to Vataman near Sabarmati estuary. Physicochemical (temprature, pH, salinity, chloride, total dissolved solids, turbidity, dissolved oxygen, biochemical oxygen demand, phenol, and petroleum hydrocarbons), biological (phytoplankton), and microbiological (total and selective bacterial count) analyses indicated that the river stretch from Ahmedabad-Vasana barriage to Vataman was highly polluted due to perennial waste discharges mainly from municipal drainage and industries. An implementation of sustainable management plan with proper treatment of both municipal and industrial effluents is essential to prevent further deterioration of the water quality of this river. |
| 17 |
Efficient removal of phosphate from aqueous solutions by red seaweed, Kappaphycus alverezii
In the present study, dead biomass of marine macro algae, Kappaphycus alverezii (K. alverezii) was used for the removal of phosphate from water. The effect of different parameters such as contact time, adsorbate concentration, biosorbent dose and temperature was investigated. The biosorption kinetics data were best described by the pseudo-second order rate equation, and equilibrium was achieved after 80 min. The phosphate biosorption was governed by film diffusion process. The maximum phosphate biosorption on K. alverezii was 59.77 mg/g at 25 °C and it followed the Redlich-Peterson model. The biosorption on K. alverezii increased with increasing temperature and was the highest at pH 6.0. The calculated thermodynamic parameters (?G°, ?H° and ?S°) showed that the biosorption of phosphate onto K. alverezii biomass was feasible, spontaneous and endothermic at 15–45 °C. Results suggest that the prepared biomass of K. alverezii has potential in remediation of phosphate contaminated waters. |
| 18 |
Synthesis of acetone reduced graphene oxide/Fe3O4 composite through simple and efficient chemical reduction of exfoliated graphene oxide for removal of dye from aqueous solution
A simple and effective technique for reduction of graphene oxide at low temperature (70 °C) using acetone was reported for the first time. Magnetically recoverable acetone reduced graphene oxide (ARGO)/Fe3O4 composite was synthesized by uniformly decorating Fe3O4 on ARGO. The synthesized ARGO/Fe3O4 composite was characterized by the powder X-ray diffraction, scanning electron microscopy, transmission electron microscopy, Fourier transform-infrared spectroscopy and thermogravimetric analysis. An organic dye rhodamine 6G was used as an adsorbate for investigating the adsorption characteristics of the composite. The adsorption kinetic data were best described by the pseudo-second-order model, and equilibrium was achieved within 2 h. Dye adsorption was favored in basic conditions (pH 9–11) and governed by intraparticle diffusion process. The maximum dye adsorption on the composite was 93.37 mg/g at 293 K, and it followed the Langmuir–Freundlich model. The calculated thermodynamic parameters (?G°, ?H° and ?S°) showed that the dye adsorption onto composite was feasible, spontaneous and exothermic. The ARGO/Fe3O4 composite was easily controlled in magnetic field for desired separation, leading to an easy removal of the dye from wastewater, which holds great potential for dye decontamination. |
| 19 |
UV induced photocatalytic degradation of aqueous acetaminophen: the role of adsorption and reaction kinetics
Nanostructured titania supported on activated carbon (AC), termed as integrated photocatalytic adsorbents (IPCAs), were prepared by ultrasonication and investigated for the photocatalytic degradation of acetaminophen (AMP), a common analgesic and antipyretic drug. The IPCAs showed high affinity towards AMP (in dark adsorption studies), with the amount adsorbed proportional to the TiO2 content; the highest adsorption was at 10 wt% TiO2. Equilibrium isotherm studies showed that the adsorption followed the Langmuir model, indicating the dependence of the reaction on an initial adsorption step, with maximum adsorption capacity of 28.4 mg/g for 10 % TiO2 IPCA. The effects of initial pH, catalyst amount and initial AMP concentration on the photocatalytic degradation rates were studied. Generally, the AMP photodegradation activity of the IPCAs was better than that of bare TiO2. Kinetic studies on the photocatalytic degradation of AMP under UV suggest that the degradation followed Langmuir–Hinshelwood (L–H) kinetics, with an adsorption rate constant (K) that was considerably higher than the photocatalytic rate constant (k r), indicating that the photocatalysis of AMP is the rate-determining step during the adsorption/photocatalysis process. |
| 20 |
Application of graphene oxide as a hydrothermal catalyst support for synthesis of TiO2 whiskers
How graphene oxide (GO) with its step edges and wrinkles (?1–2 nm) acts as a catalyst in hydrothermal nucleation and growth is demonstrated. TiO2 whiskers were prepared by using GO as a support, while TiO2 nanograss was prepared without using GO. |
| 21 |
Removal of m-phenylenediamine by adsorption onto activated carbon: Kinetics, equilibrium and process design
The adsorption behavior of m-phenylene diamine (m-PDA) from aqueous solution onto activated carbon was investigated under various experimental conditions, such as contact time, adsorbate concentration, and temperature. Maximum adsorption capacity for m-PDA was found to be 33.17 mg?g?1 at pH 7.0 and temperature 303 K. The adsorption kinetics data were best described by the pseudo-second-order rate equation and the equilibrium was achieved after 120 min. The m-PDA adsorption was governed by film diffusion process. Besides, equilibrium data were very well represented by the Redlich–Peterson model. A model for prediction of the dose of adsorbent required to achieve a range of m-PDA removals for a given number of adsorption–desorption cycles has been developed and validated based on the Langmuir isotherm. Thermodynamic parameters indicated the spontaneous, endothermic, and increased random nature of m-PDA adsorption. The amide, carboxylic acid, and nitro groups of the activated carbon were involved in chemical interaction with the m-PDA molecules. Results suggested that the activated carbon has good potential for remediation of m-PDA contaminated waters. |
| 22 |
Nanocellulose for biosorption of chlorpyrifos from water: chemometric optimization, kinetics and equilibrium
The study explores the biosorption potential of nanocellulose (NC) to remove an insecticide, chlorpyrifos (CP), from aqueous solutions using the batch method. Biosorption kinetics were very fast and reached equilibrium in 60 min, and the experimental kinetic data had fit well with the pseudo-second-order model. Film diffusion was the rate-limiting step for the biosorption of CP onto crystalline nanocellulose (CNC). The equilibrium sorption was well described by the Sips and Langmuir isotherm models. The values of maximum sorption capacities (7.237–5.017 mg/g for the Sips and 12.325–7.247 mg/g for the Langmuir model) decreased with an increase in temperature from 288 to 308 K, signifying biosorption of CP is an exothermic process. Based on the central composite design (CCD), two-factor interaction (2FI) and quadratic models, the correlation between the effects of variable parameters on the CP biosorption onto NC was evaluated. The chemometric analyses suggested that 1.5 g/l NC required 20 min to biosorb 5 mg/l CP to yield an efficiency of 99.3%. Overall, the results demonstrated that NCs can be a promising biosorbent for the removal of pesticides from aqueous streams. |
| Sr. No. | Training Program Title |
|---|---|
| 1 |
Organised a National Workshop on "Urban Environmental Management - Solutions for Sustainability UEM 2017"
This workshop will provide a platform to discuss about the existing environmental problems in the urban areas and to delineate sustainable solutions and new technologies in mitigating the pollution and prepare a road map for future environmental management in urban areas. |
| 2 |
Organised a National Symposium on "Emerging Environmental Challenges: An Engineering Approach"
Environmental issues are one of the primary causes of disease, health and long-term livelihood impact for India. The main objective of the symposium is to address the emerging environmental issues in India by providing necessary and relevant engineering solutions for remediation/abatement/control. |
| Sr. No. | Achievement / Award | Awarded By |
|---|---|---|
| 1 |
Accreditation by QCI - NABET, New Delhi Certification No. NABET/EIA/1720/RA0088 dt.15/03/2018
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Training Program