The development of environment friendly and practically feasible technologies or adsorbents to treat water pollution due to heavy metals is urgently required. Herein, Sulphate aluminate cement - bentonite (SAC-bentonite) composites were synthesized and used as low-cost and high-efficiency adsorbents to remove Cr³⁺, Pb²⁺, and Cd²⁺ from aqueous solution. The characteristics of SAC-bentonite were analyzed via X-ray diffraction (XRD) and scanning electron microscopy (SEM). Effects of the amount of adsorbent, solution pH, and contact time on the adsorption performance of SAC-bentonite were also studied. The adsorption mechanism was analyzed via XRD, X-ray photoelectron spectroscopy (XPS), and SEM. The results demonstrate that the adsorption capacities of SAC-bentonite for Cr³⁺ were similar to that of pure bentonite or pure SAC, while the adsorption capacities for Pb²⁺ and Cd²⁺ were significantly higher than those for bentonite or SAC. When the ratio of bentonite to SAC was 1:1, the removal efficiency of SAC-bentonite for Cr³⁺, Pb²⁺, and Cd²⁺ was 99.956%, 99.838%, and 99.717%, respectively. The adsorption kinetics was well described by Pseudo-second-order equation.

迫切需要开发环保和在实践中可行的技术或吸附剂来处理由于重金属引起的水污染。在此，合成了硫酸盐铝酸盐水泥-膨润土（SAC-膨润土）复合材料，并将其用作低成本和高效吸附剂，以去除Cr ³⁺，Pb ²⁺和Cd ²⁺从水溶液。通过X射线衍射（XRD）和扫描电子显微镜（SEM）分析了SAC膨润土的特性。还研究了吸附剂的量，溶液的pH值和接触时间对SAC膨润土吸附性能的影响。通过XRD，X射线光电子能谱（XPS）和SEM分析了吸附机理。结果表明，SAC膨润土对Cr ³⁺的吸附能力与纯膨润土或纯SAC相似，而Pb ²⁺和Cd ²⁺的吸附能力明显高于膨润土或SAC。当膨润土与SAC的比例为1：1时，SAC-膨润土对Cr ³⁺，Pb ²⁺的去除效率，Cd ^2+分别为99.956％，99.838％和99.717％。吸附动力学用伪二级方程很好地描述了。