Adsorption of Heavy Metals on Silica Gel Loaded with Manganese Dioxide
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摘要:
该文以原位合成法制得S-MnO2吸附剂，并采用XRD、FT-IR、SEM、BET/BJH等方法进行表征。考察了吸附反应时间、吸附剂用量、水浴温度、反应溶液酸碱度对S-MnO2吸附重金属离子的影响。结果表明，S-MnO2的吸附效果良好，去除率近100%，尤其是Cu2+、Pb2+、Zn2+等重金属离子都达到了饮用水标准。As5+在5 min内即可达到吸附平衡且S-MnO2几乎不受溶液酸碱度的影响，可在大范围pH（2~10）条件下使用。该材料成本低、效率高、使用范围广、固液分离快、无二次污染，在未来的矿山废水处理领域中有着广泛的应用前景。
Abstract:S-MnO2 adsorbent was synthesized by in-situ method and characterized by XRD, FT-IR, SEM, and BET/BJH. The effects of reaction time, amount of adsorbent, temperature and pH of solution on the adsorption performance of S-MnO2 were investigated. The results showed that S-MnO2 with excellent adsorption capacity, the removal efficiency was close to 100%, especially Cu2+, Pb2+, Zn2+, etc, which reached the drinking water standard. It could reach the adsorption equilibrium within 5min for the adsorption of As5+, and S-MnO2 was hardly affected by the pH of the solution, which could be used in a wide range of pH (2—10). The material has low cost, high efficiency, widely apply, easy to solid-liquid separation and no secondary pollution. S-MnO2 could be used as a promising adsorbent for the treatment of mine wastewater in the future.
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Key words:
- mine wastewater /
- heavy metal ions /
- manganese dioxide /
- silica gel /
- adsorption
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表 1 不同类型MnO2吸附材料比表面积的比较
Table 1. Comparison of specific surface areas of different types of MnO2 adsorption materials
Adsorbents Specific surface area (m2/g) S-MnO2 334.6 MnO2/CNT 102.92 MnO2 117 FMBO 261 
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表 2 S-MnO2对重金属的吸附效果
Table 2. Adsorption capacity of S-MnO2 on heavy metals
Heavy metal ions As5+ Cu2+ Pb2+ Zn2+ Ni2+ Co2+ Cd2+ Sb3+ Removal efficiency /% 97.75 100.00 99.99 98.33 96.63 99.45 98.95 95.60 Adsorption minimum /(mg·L-1) 0.04 0 0 0.01 0.2 0.2 0.3 0.1 Limit of drinking water standard /(mg·L-1) 0.01 1 0.01 1 0.02 0.005 0.005 0.01
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