采用制备的聚(丙烯酸-co-丙烯酰胺)/蒙脱土/腐殖酸钠复合吸附剂,研究了溶液pH值、吸附时间和Pb~(2+)溶液初始浓度等因素对重金属Pb~(2+)的吸附性能,探讨了复合吸附剂对Pb~(2+)的吸附机理. 结果表明,在pH=6.0、吸附时间2 h、Pb~(2+)溶液初始浓度0.01 mol/L和吸附剂用量0.10 g的条件下,复合吸附剂对Pb~(2+)的吸附量达到364.05 mg/g,平衡所需的时间为15 min. 与蒙脱土相比,复合吸附剂具有更高的吸附容量和更快的吸附速率.
A composite adsorbent based on acrylic acid, acrylamide, montmorillonite and sodium humate was prepared, and the effects of pH value, contact time, and initial Pb~(2+) concentration on removing Pb~(2+) from the aqueous solution by the composite adsorbent were evaluated. The adsorption mechanism of Pb~(2+) onto the as-prepared adsorbent was discussed. Under the conditions of pH=6.00, contact time of 2 h, an initial Pb~(2+) concentration of 0.01 mol/L and an amount of adsorbent of 0.10 g, the adsorption capacity of the as-prepared adsorbent for Pb~(2+) was found to be 364.05 mg/g and the adsorption system reached equilibrium within 15 min. Compared with Ca-montmorillonite and other adsorbents reported, the as-prepared composite adsorbent has a higher adsorption capacity and a faster adsorption rate.
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