The present study was carried out using dead biomass of isolated yeast species viz. Candida rugosa and Candida laurentii as biosorbents for the removal of Zn(II) from aqueous environment. C. rugosa and C. laurentii exhibited 65.4{\%} and 54.8{\%} removal of zinc at pH 6.0 in presence of 90mgL -1 Zn(II) at 30°C in batch system. Remarkable increase in Zn(II) removal was noted using dead yeast biomass treated with anionic surfactant sodium dodecyl sulphate (SDS) which was confirmed through SEM analysis. Kinetic studies based on various models were carried out and the results showed a very good compliance with the fractional power model. The experimental data were analyzed using two, three and four parameter isotherm models. The most appropriate equation for describing the isotherm profile was Freundlich model. The biosorbent performance was evaluated in column mode packed with SDS treated dead biomass of C. rugosa entrapped in sodium alginate beads. FT-IR analysis showed the involvement of -NH, -CO and -COOH functional groups in the binding of Zn(II) by yeast. The present study confirmed that immobilized SDS treated dead biomass of C. rugosa may serve as potential and eco-friendly biosorbent for removal of Zn(II) ions from aqueous solution. {\textcopyright} 2012 Elsevier B.V.

Lakshmi B

Electronics

School of Electronics Engineering

Chennai Campus

Nilanjana Mitra

Department of Bio-Medical Sciences

School of Bio Sciences and Technology

Vellore Campus

Das D

Basak G

Vellore Institute of Technology (VIT) is a private university located in&nbsp;Tamil Nadu, India. Founded in 1984, as Vellore Engineering College, the institution offers 20 undergraduate, 34 postgraduate, four integrated and four research programs. It has campuses in Vellore, Amravati, Bhopal and Chennai.

VIT is one of the top ranked private universities in India according to NIRF, THE and QS Rankings.&nbsp;Govt. of India has recognized&nbsp;VIT, Vellore as an&nbsp;Institution of Eminence. This has allowed VIT to take independent quality initiatives and move up in world ranking.

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VIT University

Biochemical Engineering Journal

Korean Journal of Chemical Engineering

Adsorptive removal of nickel(II) ions from aqueous environments using gum based and clay based polyaniline/chitosan nanobiocomposite beads and microspheres: Equilibrium, kinetic, thermodynamics and ex-situ studies

The current study presents a novel approach for the removal of Ni(II) from aqueous environments using plant gum-based (PG) and clay-based (CL) nanobiocomposite (NBC) composed of ZnO nanoparticles and chitosan. Parameters like pH, contact time, temperature, initial metal concentration and adsorbent dosage were optimized. Under optimized conditions, maximum removal of Ni(II) was noted as 90.1{\%} and 95.5{\%} in the case of PG-NBC and CL-NBC, respectively. Equilibrium studies suggested a homogeneous mode of adsorption. Good linearity was observed for the pseudo-first order kinetic model, suggesting a physical mode of adsorption. Thermodynamic studies showed an endothermic and spontaneous nature of adsorption. The mechanism was further elucidated using SEM, EDX, AFM and FT-IR analysis. Ex-situ studies showed a maximum Ni(II) removal of 87.34{\%} from electroplating wastewater using CL-NBC in column mode. Regeneration studies suggested that CL-NBC could be consistently reused up to 4 cycles.

Application of novel nanobiocomposites for removal of nickel(II) from aqueous environments: Equilibrium, kinetics, thermodynamics and ex-situ studies

The present study is focused on the removal of Hg (II) ions from aqueous environment using a new nanobiocomposite (NBC) hydrogel modified by triethylene tetra amine (TETA-NBC) and $\beta$-cyclodextrin (CD-NBC). Optimization of various parameters was done using 4-level Box-Behnken design. Maximum mercury removal (97.9{\%}; 70.1{\%}) and uptake (407.9. mg/g; 292.1. mg/g) was noted at central values of various parameters (pH: 6.0, time: 6. h, initial metal: 250. mg/L, biomass dosage: 0.6. g/L). Mode of biosorption was evaluated using equilibrium studies. Among the various equilibrium and kinetic models, Freundlich isotherm and fractional power model exhibited the best fit. Intraparticle diffusion and Boyd plot suggested two-phase diffusion in case of CD-NBC and single phase diffusion in case of TETA-NBC. The mechanism was further elucidated using SEM, EDX and FT-IR analysis. Spectroscopic analysis showed a higher mercury uptake due to enhanced surface roughness, less compaction and higher availability of functional groups in case of TETA-NBC compared to CD-NBC. Ex situ studies were conducted using a packed bed column in upflow mode. TETA-NBC could be reused upto six cycles. Comparative studies using Amberlite (commercial resin) showed that TETA-NBC could serve as alternative and cost effective agent for remediation of mining wastewater.

Ecological Engineering

Removal of Hg (II) ions from aqueous environment using glutaraldehyde crosslinked nanobiocomposite hydrogel modified by TETA and β-cyclodextrin: Optimization, equilibrium, kinetic and ex situ studies

Journal of Molecular Liquids

Effective removal of dichlorvos from aqueous solution using biopolymer modified MMT–CuO composites: Equilibrium, kinetic and thermodynamic studies

In the present study, response surface methodology (RSM) employing Box-Behnken design was used to optimize the parameters for biosorption of praseodymium(III) onto biowaste materials viz., crab shell (C{\textless}inf{\textgreater}R{\textless}/inf{\textgreater}S) and orange peel (OP). Various process parameters viz., pH (A: 3.0-9.0), biomass dosage (B: 0.05-0.35g/L), initial metal concentration (C: 50-350mg/L), temperature (D: 20-60°C) and contact time (E: 5-60min) were chosen for optimization. A square root transformation was suggested by the Box-Cox plot in the present case. A low p-value of {\textless}0.0001 validated the significance of the model. Maximum Pr(III) uptake of 57.8mg/g for (C{\textless}inf{\textgreater}R{\textless}/inf{\textgreater}S) and 49.9mg/g for OP was noted under optimum conditions. Among the equilibrium isotherms tested, Langmuir was found to be the best fitted model suggesting a homogeneous mode of biosorption for both the biosorbents. Kinetic studies showed better applicability of pseudo-first order model for C{\textless}inf{\textgreater}R{\textless}/inf{\textgreater}S suggesting physisorption and pseudo-second order model for OP confirming chemisorption as phenomena underlying the process. SEM analysis confirmed the homogeneous mode of biosorption. FTIR studies confirmed the involvement of amine, alcohol, ketone and amide groups in the process of Pr(III) biosorption onto C{\textless}inf{\textgreater}R{\textless}/inf{\textgreater}S and OP. Regeneration studies suggested that the biosorbents could be consistently reused upto 7 cycles with a minor metal leaching of 0.97{\%} and 0.89{\%}.

Optimization of parameters for praseodymium(III) biosorption onto biowaste materials using response surface methodology: Equilibrium, kinetic and regeneration studies

Bioaccumulation of synthetic dyes viz. Acid Blue 93, Direct Red 28 and Basic Violet 3 by growing cells of yeast, Pichia fermentans MTCC 189 was investigated in growth media prepared from sugarcane bagasse extract. The maximum dye bioaccumulation was determined at pH 5.0 for all the dyes tested. Two kinetic models viz. Noncompetitive and Uncompetitive models were tested in order to determine the toxic effects of dyes on the specific growth rate of P. fermentans MTCC 189. Basic Violet 3 was found to be more toxic than the other two dyes. The combined effects of sugarcane bagasse extract and initial Basic Violet 3 dye concentrations on the specific growth rate and dye bioaccumulation efficiency of P. fermentans MTCC 189 was investigated and optimized using Response Surface Methodology (RSM). A 22 full factorial central composite design was successfully used for analysis of results. The optimum combination predicted via RSM confirmed that P. fermentans MTCC 189 was capable of bioaccumulating Basic Violet 3 dye upto 69.8{\%} in the medium containing 10mg/L of dye and 24g/L sugar extracted from sugarcane bagasse. {\textcopyright} 2010 Elsevier B.V.

Journal of Hazardous Materials

Combined effects of sugarcane bagasse extract and synthetic dyes on the growth and bioaccumulation properties of Pichia fermentans MTCC 189

The Grants Register 2019

Ministry of Environment & Forests (MoEF) Government of India

Benezit Dictionary of Artists

Brierly, Oswald Walter (Sir)

Journal of Environmental Management

Biosorption of Reactive Black 5 from aqueous solutions by chitosan: Column studies

Removal of zinc by live, dead, and dried biomass of Fusarium spp. isolated from the abandoned-metal mine in South Korea and its perspective of producing nanocrystals

Kinetics and equilibrium studies on removal of zinc(II) by untreated and anionic surfactant treated dead biomass of yeast: Batch and column mode

Journal	Data powered by TypesetBiochemical Engineering Journal
Publisher	Data powered by TypesetElsevier BV
ISSN	1369-703X
Open Access	0