Wang Hongyu, Xiao Henglin, Huang Mengyuan, Wu Zhengyang, Tan Xibei, Wang Bin, Guo Wenbin, Chen Rongfan, Lu Wangye, Zheng Zihan, Zhou Dao, Chen Ling
School of Civil Engineering, Wuhan University, Wuhan 430072, China.
Key Laboratory of Intelligent Health Perception and Ecological Restoration of Rivers and Lakes, Ministry of Education, Hubei University of Technology, Wuhan 430068, China.
J Contam Hydrol. 2025 Sep;274:104648. doi: 10.1016/j.jconhyd.2025.104648. Epub 2025 Jun 10.
In this work, the sludge-derived humic acid (SHA), extracted from the remaining sludge of landfill leachate, was utilized to modify sodium alginate (SA) and prepare SA/SHA aerogel. The adsorption characteristics and underlying mechanisms of Cu(II) by SA/SHA aerogel in aqueous solutions were systematically investigated. The findings revealed that SA/SHA aerogel exhibited superior adsorption capabilities, with a maximum adsorption capacity for Cu(II) reaching 188.38 mg/g. The results aligned well with the pseudo-second-order kinetic model and the Langmuir isotherm model, indicating a uniform distribution of adsorption sites on the aerogel's surface, primarily driven by chemisorption-mediated monolayer adsorption of Cu(II). An examination of heavy metal leaching during the adsorption process confirmed the absence of secondary contamination in the solution after SA/SHA treatment. Studies on the presence of co-ions indicated that monovalent cations had a minimal impact on the selective adsorption of Cu(II) by SA/SHA aerogel, whereas divalent cations exerted a more significant influence. Furthermore, SA/SHA aerogel retained its structural integrity without disintegration even after five cycles of adsorption-desorption. Characterization techniques indicated that the adsorption mechanism of SA/SHA aerogel was dominated by complexation reactions and ion exchange of cations, supplemented by redox reactions.
在这项工作中，从垃圾渗滤液剩余污泥中提取的污泥衍生腐殖酸（SHA）被用于改性海藻酸钠（SA）并制备SA/SHA气凝胶。系统研究了SA/SHA气凝胶在水溶液中对Cu(II)的吸附特性及潜在机制。研究结果表明，SA/SHA气凝胶表现出优异的吸附能力，对Cu(II)的最大吸附容量达到188.38 mg/g。结果与准二级动力学模型和朗缪尔等温线模型吻合良好，表明气凝胶表面吸附位点分布均匀，主要由Cu(II)的化学吸附介导的单层吸附驱动。对吸附过程中重金属浸出的检查证实，SA/SHA处理后溶液中不存在二次污染。对共存离子的研究表明，单价阳离子对SA/SHA气凝胶对Cu(II)的选择性吸附影响最小，而二价阳离子的影响更为显著。此外，即使经过五个吸附-解吸循环，SA/SHA气凝胶仍保持其结构完整性而不分解。表征技术表明，SA/SHA气凝胶的吸附机制以阳离子的络合反应和离子交换为主，辅以氧化还原反应。
