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| Research on extracting cobalt from low concentration cobalt containing leaching solution using modified montmorillonite loaded with sulfur |
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Received:March 04, 2024
Revised:March 22, 2024
Accepted:March 26, 2024
Published Online:March 24, 2025
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| DOI： |
| KeyWord:Cobalt-containing;waste residue,Montmorillonite, Adsorption, Kinetics |
| Author | Institution |
| shaomingjie |
Kunming University of Science and Technology |
| zhangliping |
Ganjiang Innovation Academy,Chinese Academy of Sciences, |
| xiaowanhai |
Ganjiang Innovation Academy,Chinese Academy of Sciences, |
| tanning |
Kunming University of Science and Technology |
| wangzhi |
Institute of Process Engineering, Chinese Academy of Sciences,Beijing |
| weikuixian |
Kunming University of Science and Technology |
| wangdong |
Institute of Process Engineering, Chinese Academy of Sciences,Beijing |
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| Abstract: |
| To address the difficulty of extracting low-concentration Co2+ from acidic leachate of cobalt-containing waste residues, a sulfur-modified montmorillonite composite material was prepared using a method involving the mixed calcination of NaOH and S with montmorillonite. This material was employed for the adsorption of Co2+ in the acidic leachate. The adsorption performance of the prepared sulfur-modified montmorillonite composite material for Co2+ was investigated. The study indicates that S is successfully encapsulated into the montmorillonite and is uniformly distributed with Na in the montmorillonite structure. Under the conditions of an initial Co2+ concentration of 100 ppm, solution pH of 8, adsorbent dosage of 3 g.L-1, and adsorption time of 10 hours, the maximum adsorption capacity of the sulfur-modified montmorillonite composite material is 90 mg.g-1, and the recovery rate of Co2+ can reach 95%. Furthermore, the study on the adsorption process of Co2+ by sulfur-modified montmorillonite composite material reveals that the process conforms to a pseudo-second-order kinetic model with an R2 value of 0.9990. Co2+ in the solution enters the modified montmorillonite in two ways: firstly, through the combination of Co2+ and S2- via soft and hard acid-base interactions, and secondly, Co2+ replaces Na in the interlayer structure of montmorillonite, achieving efficient extraction of Co2+. |
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