Efficient catalytic reduction of hazardous hexavalent chromium by cobalt sulfide nanoparticles
| Autor: | Kalyan Raj, T. N. Ravishankar, K. Arathi, K. L. Nagashree |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
inorganic chemicals
General Chemical Engineering technology industry and agriculture chemistry.chemical_element Sulfuric acid Selective catalytic reduction 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Biochemistry Cobalt sulfide Industrial and Manufacturing Engineering 0104 chemical sciences Catalysis Chromium chemistry.chemical_compound chemistry Specific surface area Materials Chemistry Methanol Hexavalent chromium 0210 nano-technology Nuclear chemistry |
| Zdroj: | Chemical Papers. 75:4707-4718 |
| ISSN: | 1336-9075 2585-7290 |
| DOI: | 10.1007/s11696-021-01655-2 |
| Popis: | Aiming at the catalytic reduction of hazardous hexavalent chromium, cobalt sulfide nanoparticles (CoS2 NPs) were synthesized solvothermally from 1:1 v/v ratio of methanol and water. The nanoparticles were characterized by XRD, SEM, TEM, FTIR and BET for their composition, crystal structure, morphology and specific surface area. Reduction of carcinogenic hexavalent chromium to non-toxic trivalent chromium was found to occur efficiently on these CoS2 NPs. Effect of various parameters such as catalyst loading, initial chromium concentration, pH, reaction time and recyclability was studied. At pH 2 in sulfuric acid, reduction of 50 mL of 50 ppm Cr(VI) with 1.5 g/L of catalyst was found to be complete within 16 min with ~ 99.63% efficiency. The catalyst was found to be efficient up to 17 cycles after which the activity decreased. Column studies with effluent sample from electroplating industry indicated that these nanoparticles are promising for treatment of chromium contaminated industrial water. |
| Databáze: | OpenAIRE |
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