中文摘要：

通过吸附实验,研究了凹凸棒土-腐植酸复合体对Pb（Ⅱ）的吸附特性及机理。结果表明,复合体对Pb（Ⅱ）的吸附量显著高于各自单一的吸附量;当pH〉4,凹凸棒土-腐植酸复合体对Pb（Ⅱ）的吸附量有所增加,这与其等电点有关;凹凸棒土-腐植酸复合体较凹凸棒土上Pb（Ⅱ）的解吸率小,且解吸率随Pb（Ⅱ）吸附浓度升高而降低;凹凸棒土-腐植酸复合体溶液中溶解态腐植酸的量较单一腐植酸溶液有显著增加;红外光谱（IR）表明凹凸棒土-腐植酸复合体在吸附Pb（Ⅱ）后,大量特征峰变宽或消失,而腐植酸吸附Pb（Ⅱ）后仍可发现羟基等基团特征峰,说明腐植酸、凹凸棒土-腐植酸复合体的某些表面基团虽然相同,但混合物的基团更易与Pb（Ⅱ）结合。

英文摘要：

The characteristics and mechanisms of Pb（ Ⅱ ） adsorption by the complex of palygorskite and humic acid were studied in the present paper. The results showed that the quantity of Pb（ Ⅱ） adsorption on the complex of palygorskite and humic acid was higher than those on the palygorskite or humic acid alone. The sorption quantity of Pb （ Ⅱ ） on the complex of palygorskite and humic acid increased significantly with pH〉4. The desorption percentage of Pb （ Ⅱ ） from the complex of palygorskite and humic acid was lower than those from palygorskite, and decreased with the increasing Pb （ Ⅱ ） concentrations in the solution. The content of dissolved organic carbon was significantly greater in the solution of the complex of palygorskite and humic acid than that in the solution of humic acid. The analysis of infrared spectrum indicated that many absorption peaks were broadened or disappeared after Pb （ Ⅱ ） adsorption on the complex of palygorskite and humie acid, while some absorption peaks were still observed when the single humic acid adsorbed Pb（ Ⅱ ）. This showed that the groups on the complex of palygorskite and humic acid were combined with Pb（ Ⅱ ） strongly.