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| Study on Adsorption of Zn(Ⅱ) by Modified Electrolytic Manganese Slag |
| Received:January 12, 2021 Revised:January 14, 2021 |
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| DOI：doi：10.3969/j.issn.1007-7545.2021.05.019 |
| KeyWord:electrolytic manganese slag; composite modification; Zn(Ⅱ); adsorption |
| Author | Institution |
| HUANG Yan |
贵州大学矿业学院 |
| ZHANG Qin |
贵州科学院 |
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| Abstract: |
| To address high Zn(Ⅱ) content in mine wastewater and low resource utilization of electrolytic manganese residues, modified electrolytic manganese slag (M-EMR) adsorption material was prepared by way of composite modification of strong alkali, ultrasonic and thermal activation, which was used to adsorb Zn(Ⅱ) in liquor. The results show that modification of electrolytic manganese residue has good adsorption effect on removing Zn(Ⅱ), and Zn(Ⅱ) removal rate is 99.94% under the conditions including pH value of 6, M-EMR dosage of 1.8 g/L, and adsorption time of 40 min. Adsorption of Zn(Ⅱ) by M-EMR consistents with the pseudo-second-order kinetics model and adsorption isotherm conforms to Langmuir model. The maximum adsorption capacity of M-EMR for Zn(Ⅱ) is 99.11 mg/g. The thermodynamic parameter of ΔH° is calculated to be 49.60 kJ/mol, moreover, ΔG°＜0, indicating that adsorption process is spontaneous and endothermic reaction. |
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