凹凸棒土对废水中Pb(Ⅱ)吸附的初步研究

Primary study on absorption behavior of Pb(Ⅱ)on attapulgite clay

研究了凹凸棒土对重金属离子Pb（Ⅱ）的吸附性能．考察了平衡时间、凹凸棒土用量、pH等对Pb（Ⅱ）在凹凸棒土上吸附性能的影响．结果表明，凹凸棒土对Pb（Ⅱ）具有较强的吸附性能，在Ph（Ⅱ）质量浓度为9．375×10^-3／L，6h时达到吸附平钠；凹凸棒土质量浓度在0．05g／L时，吸附效果较好；Pb（Ⅱ）在凹凸棒土上的吸附受pH影响较大，在pH为6．5～9．5时吸附率达到最大．

The absorption behavior of Pb（Ⅱ） on attapulgite clay was studied. The effects of equilibrium time, attapulgite clay dosage, pH on the absorption behavior of Pb（Ⅱ） on attapulgite clay were investigated. The results showed that attapulgite clay had high absorption ability, and the absorption equilibrium could be at- tained at 6 h when Pb（Ⅱ） concentration was 9.375×10^-3 g/L. The optimal adsorption effect could be obtained when the mass content of attapulgite clay was 0.05 g/L. The pH of the solution played an important role on the adsorption of Pb（ Ⅱ ） to attapulgite clay. The removal of Pb（ Ⅱ） maintained a high level at pH=6.5-9.5.