Abstract Palygorskite was applied in complexation-ultrafiltration treatment of heavy metals in wastewater under different pH and ionic strength. The results indicated that the rejection of heavy metals increased significantly with pH value, and decreased slightly with an increase of ionic strength of Na+ and Cl–. A certain concentration of NaCl significantly reduced the rejection rate of Cu2+. The rejection of Cu2+, Zn2+ and Cd2+ could reach over 86.8%, 93.6% and 93.7% at pH of 7 and 0.1 mol/L NaCl. The rejection of heavy metals was severely affected by low molecular weight competing complexing agents and the effect of sodium tartrate was greater than triethanolamine. In the presence of sodium tartrate, the rejection of Cu2+, Zn2+ and Cd2+ could arrive over 81.4%, 57.6% and 60.5% at pH of 7 in 20 min. Palygorskite was offered a potential complexing agent for the removal of heavy metals in wastewater at the complexation-ultrafiltration process.

中文翻译：

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坡缕石络合重金属废水超滤处理

摘要 坡缕石应用于不同pH和离子强度下废水中重金属的络合超滤处理。结果表明，重金属截留率随pH值显着增加，随Na+和Cl-离子强度的增加略有下降。一定浓度的NaCl显着降低了Cu2+的去除率。在 pH 为 7 和 0.1 mol/L NaCl 的条件下，Cu2+、Zn2+ 和 Cd2+ 的去除率可达到 86.8%、93.6% 和 93.7% 以上。低分子量竞争络合剂对重金属的排斥作用严重，酒石酸钠的作用大于三乙醇胺。在酒石酸钠存在下，在 pH 值为 7 时，Cu2+、Zn2+ 和 Cd2+ 的去除率在 20 分钟内可达到 81.4%、57.6% 和 60.5% 以上。