Equilibrium and kinetic modeling of Cr(VI) removal by novel tolerant bacteria species along with zero-valent iron nanoparticles
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 is...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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Nature Portfolio
2024-04-01
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| Series: | Scientific Reports |
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| Online Access: | https://doi.org/10.1038/s41598-024-57835-z |
| _version_ | 1797209406942740480 |
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| author | Shashank Garg Simranjeet Singh Nadeem A. Khan Jastin Samuel Praveen C. Ramamurthy Joginder Singh |
| author_facet | Shashank Garg Simranjeet Singh Nadeem A. Khan Jastin Samuel Praveen C. Ramamurthy Joginder Singh |
| author_sort | Shashank Garg |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-04-24T09:54:12Z |
| format | Article |
| id | doaj.art-54c75229d39345e9a24993753db3b616 |
| institution | Directory Open Access Journal |
| issn | 2045-2322 |
| language | English |
| last_indexed | 2024-04-24T09:54:12Z |
| publishDate | 2024-04-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | Scientific Reports |
| spelling | doaj.art-54c75229d39345e9a24993753db3b6162024-04-14T11:13:13ZengNature PortfolioScientific Reports2045-23222024-04-0114111210.1038/s41598-024-57835-zEquilibrium and kinetic modeling of Cr(VI) removal by novel tolerant bacteria species along with zero-valent iron nanoparticlesShashank Garg0Simranjeet Singh1Nadeem A. Khan2Jastin Samuel3Praveen C. Ramamurthy4Joginder Singh5Department of Biotechnology, Lovely Professional UniversityInterdisciplinary Centre for Water Research (ICWaR), Indian Institute of ScienceInterdisciplinary Research Center for Membranes and Water Security, King Fahd University of Petroleum and MineralsWaste Valorization Research Lab, Lovely Professional UniversityInterdisciplinary Centre for Water Research (ICWaR), Indian Institute of ScienceDepartment of Botany, Nagaland UniversityAbstract 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.https://doi.org/10.1038/s41598-024-57835-zHexavalent chromiumNanobioadsorbentZerovalent ironIsothermModelingKinetics |
| spellingShingle | Shashank Garg Simranjeet Singh Nadeem A. Khan Jastin Samuel Praveen C. Ramamurthy Joginder Singh Equilibrium and kinetic modeling of Cr(VI) removal by novel tolerant bacteria species along with zero-valent iron nanoparticles Scientific Reports Hexavalent chromium Nanobioadsorbent Zerovalent iron Isotherm Modeling Kinetics |
| title | Equilibrium and kinetic modeling of Cr(VI) removal by novel tolerant bacteria species along with zero-valent iron nanoparticles |
| title_full | Equilibrium and kinetic modeling of Cr(VI) removal by novel tolerant bacteria species along with zero-valent iron nanoparticles |
| title_fullStr | Equilibrium and kinetic modeling of Cr(VI) removal by novel tolerant bacteria species along with zero-valent iron nanoparticles |
| title_full_unstemmed | Equilibrium and kinetic modeling of Cr(VI) removal by novel tolerant bacteria species along with zero-valent iron nanoparticles |
| title_short | Equilibrium and kinetic modeling of Cr(VI) removal by novel tolerant bacteria species along with zero-valent iron nanoparticles |
| title_sort | equilibrium and kinetic modeling of cr vi removal by novel tolerant bacteria species along with zero valent iron nanoparticles |
| topic | Hexavalent chromium Nanobioadsorbent Zerovalent iron Isotherm Modeling Kinetics |
| url | https://doi.org/10.1038/s41598-024-57835-z |
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