Abstract:

Sepiolite ore powder adsorbent was prepared by heat treatment. Its structure was characterized by FTIR and XRD. Adsorption and regeneration properties of sepiolite ore powder for nickel containing simulated wastewater were studied. The experimental results showed that sepiolite ore powder had good crystallinity, contained many functional groups, such as hydroxyl group, silicon hydroxyl group and carbonyl group. It could improve the adsorption efficiency of nickel ions in the wastewater. When initial mass concentration of simulated wastewater was 10 mg/L, pH was 6, the amount of adsorbent was 2 g, the adsorption time was 320 minutes, the adsorption removal rate of nickel ions was 97.33%, and the adsorption process of nickel ions was more in line with the Freunndlichr isotherm model and the quasi second order kinetic equation. The regeneration of oxalic acid was the best. After three adsorption regeneration cycles, the removal rate of nickel ions was still maintained at 94.44%.

Key words: sepiolite, nickel, adsorption, regeneration

摘要：

采用热处理法制备了海泡石矿粉吸附剂，研究其对含镍模拟废水的吸附及再生性能，用FTIR和XRD对其结构进行表征。实验结果表明，海泡石矿粉的结晶度较好，表面含有羟基、硅羟基、羰基等多种官能团，可提高对废水中镍的吸附性能；当模拟废水初始质量浓度为10 mg/L、pH为6、吸附剂用量为2 g、吸附时间为320 min时，对镍的去除率为97.33%；海泡石矿粉对镍的吸附过程更符合Freundlich等温模型和准二级动力学方程。草酸的再生效果最好，经过3次吸附-再生循环后，对镍的去除率仍维持在94.44%。

关键词: 海泡石, 镍, 吸附, 再生

CLC Number: 

• X703