Hexametaphosphate cross-linked chitosan beads for the eco-efficient removal of organic dyes: tackling water quality

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dc.contributor.author Raval, Nirav P.
dc.contributor.author Mukherjee, Santanu
dc.contributor.author Shah, Nisha K.
dc.contributor.author Gikas, Petros
dc.contributor.author Kumar, Manish
dc.coverage.spatial United States of America
dc.date.accessioned 2021-03-06T15:08:14Z
dc.date.available 2021-03-06T15:08:14Z
dc.date.issued 2021-02
dc.identifier.citation Raval, Nirav P.; Mukherjee, Santanu; Shah, Nisha K.; Gikas, Petros and Kumar, Manish, "Hexametaphosphate cross-linked chitosan beads for the eco-efficient removal of organic dyes: tackling water quality", Journal of Environmental Management, DOI: 10.1016/j.jenvman.2020.111680, vol. 280, Feb. 2021. en_US
dc.identifier.issn 0301-4797
dc.identifier.uri https://doi.org/10.1016/j.jenvman.2020.111680
dc.identifier.uri https://repository.iitgn.ac.in/handle/123456789/6338
dc.description.abstract There is an increasing trend of developing various low-cost grafted natural amino polysaccharides for the biosorptive removal of noxious dye effluents like Malachite green (MG) and anionic Reactive Red-195 (RR-195) dyes from aqueous solution. Chemically cross-linked chitosan microsphere (CTS-HMP), a promising non-toxic biosorbent possessing high charge density and thermal stability was prepared by using hexametaphosphate as ionic cross-linker. Batch biosorption experiments were carried out under different temperatures (298, 308 and 318 K), pH (2.0-10.0), initial concentrations (25-250 mg L?1), adsorbent dosage (0.01-0.1 g) and contact times (0-180 min) to understand the optimum experimental conditions and simultaneously evaluate the adsorption isotherms and kinetics of CTS-HMP. Biosorption equilibrium was established in 120 and 60 min for MG and RR-195 removal process. The pseudo-equilibrium process was best described by the pseudo-second-order kinetic (R2 ? 0.98), Freundlich and Temkin isotherm model (R2 ? 0.90). The removal rate of MG and RR-195 gradually increased (69.40 and 148 mg g?1) at 250 mg L?1 of initial concentration till 100 and 50 min of contact period in a single contaminant system, though the removal efficiency of acid dye was ~2 times higher compared to basic dye under optimum conditions (p < 0.05; t-test). Thermodynamic parameters indicated exothermic (MG) and endothermic (RR-195) nature of spontaneous dye removal. The activation energy of sorption (Ea) was <50 kJ mol?1 which highlighted the importance of physical adsorption process. Therefore, the obtained results clearly validate the sustainable utilization of CTS-HMP as a promising functionalized chitosan microparticles/agent for removing dye effluents from the contaminated aqueous phase.
dc.description.statementofresponsibility by Nirav P. Raval, Santanu Mukherjee, Nisha K. Shah, Petros Gikas and Manish Kumar
dc.format.extent vol. 280
dc.language.iso en-Us en_US
dc.publisher Elsevier en_US
dc.subject Hexametaphosphate en_US
dc.subject Malachite green en_US
dc.subject Reactive red�195 en_US
dc.subject Biosorption en_US
dc.subject Chitosan en_US
dc.subject Thermodynamic en_US
dc.title Hexametaphosphate cross-linked chitosan beads for the eco-efficient removal of organic dyes: tackling water quality en_US
dc.type Article en_US
dc.relation.journal Journal of Environmental Management

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