Water treatment residuals produced after addition of polyaluminium chloride and anionic polyacrylamide (PAC-APAM WTRs) were evaluated for the potential to remove Cd²⁺ and Zn²⁺ from aqueous solutions by batch adsorption studies. The maximum adsorption capacity obtained from Langmuir modeling was 85.5 mg Cd²⁺/g PAC-APAM WTRs or 25.6 mg Zn²⁺/g PAC-APAM WTRs. A Dubinin-Radushkevich (D-R) model study showed that the adsorption process was chemically controlled. The pseudo-second-order model described the adsorption kinetic data better than the pseudo-first-order model, while kinetic studies showed that the adsorption process included external surface adsorption and intraparticle diffusion, which was likely the rate-limiting step. PAC-APAM WTRs adsorbed Cd²⁺ and Zn²⁺ in the pH range of 3–9 and in the temperature of 20–40 °C, and the immobilization ability for both ions increased with the increase of pH or an increase in temperature. FT-IR spectroscopy analysis illustrated that the carboxyl groups from APAM in WTRs participated in the adsorption reactions in addition to Fe(Al)-O functional groups and O–H groups. This short-term study showed that PAC-APAM WTRs could be a cost-effective media for the remediation of Cd²⁺ and Zn²⁺ contaminated soils. Further studies are needed to examine the slow adsorption mechanisms and determine the optimum mass ratio of soil to PAC-APAM WTRs under various soil conditions.

通过分批吸附研究，评估了添加聚氯化铝和阴离子聚丙烯酰胺（PAC-APAM WTR）后产生的水处理残留物，用于从水溶液中去除Cd ²⁺和Zn ²⁺的潜力。从Langmuir模型获得的最大吸附容量为85.5 mg Cd ²⁺ / g PAC-APAM WTRs或25.6 mg Zn ²⁺/ g PAC-APAM WTR。Dubinin-Radushkevich（DR）模型研究表明，吸附过程是化学控制的。拟二级模型比拟一级模型描述的吸附动力学数据更好，而动力学研究表明吸附过程包括外表面吸附和颗粒内扩散，这很可能是限速步骤。PAC-APAM WTR吸附Cd ²⁺和Zn ²⁺在3-9的pH范围和20-40°C的温度下，两种离子的固定能力随pH的增加或温度的升高而增加。FT-IR光谱分析表明，WTR中APAM的羧基除了Fe（Al）-O官能团和O-H基团外，还参与了吸附反应。这项短期研究表明，PAC-APAM WTR可能是修复Cd ²⁺和Zn ²⁺污染土壤的一种经济有效的介质。需要进一步研究以研究缓慢的吸附机理，并确定在各种土壤条件下土壤与PAC-APAM WTR的最佳质量比。