赤泥基吸附剂对废水中重金属离子吸附机理研究

利用赤泥基吸附剂对废水中重金属离子开展吸附特性研究，以酸性废水中Cu²⁺、Zn²⁺为研究对象，借助吸附动力学模型、吸附等温线、FTIR、XRD等手段探究了赤泥基吸附剂的吸附机理。结果表明：赤泥基吸附剂对重金属离子Cu²⁺、Zn²⁺的吸附过程属于单分子层吸附，Langmuir吸附等温线拟合得出吸附剂对Cu²⁺、Zn²⁺的最大吸附量分别为33.12 mg/g、129.88 mg/g，符合准二级动力学模型。赤泥基吸附剂中Si-O-Si键与Cu²⁺、Zn²⁺发生相互作用，吸附过程为化学吸附。该研究为铝工业固废赤泥的回收利用提供了新途径。

Heavy Metal Adsorption Mechanism of Red Mud-based Adsorbent in Acidic Wastewater

The adsorption characteristics of heavy metal ions in wastewater were investigated by using red mud-based adsorbent. The adsorption mechanism of red mud-based adsorbent was investigated by means of adsorption kinetic model, adsorption isotherm, FTIR and XRD with Cu2+and Zn2+ in acidic wastewater as the target. The results showed that the adsorption process of heavy metal ions Cu2+ and Zn2+ by the red mud-based adsorbent belonged to monomolecular layer adsorption, and the maximum adsorption amounts of Cu2+ and Zn2+ by Langmuir adsorption isotherms were 33.12 mg/g and 129.88 mg/g, respectively, which were in accordance with the quasi-secondary kinetic model. The Si-O-Si in the red mud-based adsorbent interacted with Cu2+ and Zn2+ and the adsorption process was chemisorption. This study provides a new way for the recycling of solid waste red mud from aluminum industry.