Highly Efficient Removal of Cu(II) with Modified Electrolytic Manganese Residue as A Novel Adsorbent
Arabian Journal for Science and Engineering, ISSN: 2191-4281, Vol: 47, Issue: 5, Page: 6577-6589
2022
- 6Citations
- 2Captures
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Article Description
Electrolytic manganese residue (EMR) is a solid waste generated during the process of electrolytic manganese production, and stockpiling EMR causes serious pollution. Therefore, the resource utilization of EMR is receiving increasing attention. In this study, EMR is modified by KOH and ultrasonic etching. The modified electrolytic manganese residue (M-EMR) was used as a novel adsorbent to remove Cu(II). The results showed that the Cu(II) concentration in the liquid decreased from 80 to 0.047 mg/L when the dosage of M-EMR was 1.2 g/L, the pH value was 6, and contact time was 40 min. The maximum theoretical adsorption capacity of M-EMR for Cu(II) was 114.286 mg/g. The kinetic data of adsorption conform to the pseudo-second-order model. The equilibrium isotherm results are consistent with the Langmuir isotherm equation. Adsorption thermodynamics indicate that the adsorption is a spontaneous endothermic reaction and mainly based on chemisorption. Furthermore, plausible mechanisms were proposed: EMR was modified to M-EMR that has a strong ability to remove Cu(II). The main reason is that Cu(II) can react with FeO, FeOOH, and MnO that are on the surface of M-EMR. MnO, FeO, SiO and some part of the Cu(II) on the surface of the sample were adsorbed by van der Waals force, and the remaining Cu(II) was adsorbed on the surface of M-EMR by electrostatic attraction. Preliminary analysis indicates the application potential of M-EMR in Cu-contaminated industrial wastewater.
Bibliographic Details
Springer Science and Business Media LLC
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