Garg, S and Singh, S and Khan, NA and Samuel, J and Ramamurthy, PC and Singh, J (2024) Equilibrium and kinetic modeling of Cr(VI) removal by novel tolerant bacteria species along with zero-valent iron nanoparticles. In: Scientific Reports, 14 (1).
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Abstract
This work describes the study of the removal of a refractory contaminant, i.e., Hexavalent chromium (Cr(VI)) from aqueous systems by a novel adsorbent comprising Cr(VI) tolerant bacteria and zero valent iron nanoparticle (nZVI). A gram-positive, rod-shaped bacteria used in the study were isolated from wastewater (WW) received from the effluent of leather industries. The adsorbents were prepared with bacteria, nZVI alone, and a combination of both. The adsorbent comprising both elements was found to remove Cr(VI) with a higher percentage (93) and higher capacities (0.58 mg/g) as compared to adsorbent with bacteria (Cr(VI) removal = 63, qe = 0.163 mg/g) or nanoparticles (Cr(VI) removal = 80, qe = 0.45 mg/g) alone. The adsorbent worked best at neutral pH, and the removal became saturated after 90 min of incubation. Equilibrium studies with isotherm modeling suggested that the adsorption process follows sips isotherm (R2 = 0.9955), which is expected to bean intra-particle diffusion process before the actual adsorption. Process kinetics was modeled with pseudo-first order, pseudo-second order, and Vermeulen model. The diffusion coefficient determined by fitting the kinetic data to Vermeulen model was found to be 0.0000314 cm2/s. The adsorbent can be tested further for continuous flow processes to find more insights about the usage on a large scale. © The Author(s) 2024.
| Item Type: | Journal Article |
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| Publication: | Scientific Reports |
| Publisher: | Nature Research |
| Additional Information: | The copyright for this article belongs to authors. |
| Keywords: | chromium; chromium hexavalent ion; iron; nanoparticle, adsorption; bacterium, Adsorption; Bacteria; Chromium; Iron; Nanoparticles |
| Department/Centre: | Division of Interdisciplinary Sciences > Interdisciplinary Centre for Water Research |
| Date Deposited: | 08 Jul 2024 05:57 |
| Last Modified: | 08 Jul 2024 05:57 |
| URI: | http://eprints.iisc.ac.in/id/eprint/84725 |
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