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Technical University of Crete
Technical University of Crete
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| URI | http://purl.tuc.gr/dl/dias/1357A6B8-A8FF-49FE-A98D-C5C2D9B19806 | - |
| Identifier | https://doi.org/10.1016/j.jenvman.2020.111680 | - |
| Identifier | https://www.sciencedirect.com/science/article/pii/S0301479720316054 | - |
| Language | en | - |
| Extent | 12 pages | en |
| Title | Hexametaphosphate cross-linked chitosan beads for the eco-efficient removal of organic dyes: tackling water quality | en |
| Creator | Raval Nirav | en |
| Creator | Mukherjee Santanu | en |
| Creator | Shah Nisha K. | en |
| Creator | Gikas Petros | en |
| Creator | Γκικας Πετρος | el |
| Creator | Kumar Manish | en |
| Publisher | Elsevier | en |
| Content Summary | 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. | en |
| Type of Item | Peer-Reviewed Journal Publication | en |
| Type of Item | Δημοσίευση σε Περιοδικό με Κριτές | el |
| License | http://creativecommons.org/licenses/by/4.0/ | en |
| Date of Item | 2023-04-27 | - |
| Date of Publication | 2021 | - |
| Subject | Hexametaphosphate | en |
| Subject | Malachite green | en |
| Subject | Reactive red–195 | en |
| Subject | Biosorption | en |
| Subject | Chitosan | en |
| Subject | Thermodynamic | en |
| Bibliographic Citation | N. P. Raval, S. Mukherjee, N. K. Shah, P. Gikas, and M. Kumar, "Hexametaphosphate cross-linked chitosan beads for the eco-efficient removal of organic dyes: tackling water quality," J. Environ. Manage., vol. 280, Feb. 2021, doi: 10.1016/j.jenvman.2020.111680. | en |
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