Copper ions removal in water by sodium alginate/sludge-derived humic acid aerogel: Adsorption mechanism and removal effect

IF 3.5 3区环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES

Journal of contaminant hydrology Pub Date : 2025-06-10 DOI:10.1016/j.jconhyd.2025.104648

Hongyu Wang , Henglin Xiao , Mengyuan Huang , Zhengyang Wu , Xibei Tan , Bin Wang , Wenbin Guo , Rongfan Chen , Wangye Lu , Zihan Zheng , Dao Zhou , Ling Chen

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Abstract

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.

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海藻酸钠/污泥源腐植酸气凝胶去除水中铜离子：吸附机理及去除效果

以垃圾渗滤液剩余污泥为原料，提取污泥源腐植酸（SHA）对海藻酸钠（SA）进行改性，制备SA/SHA气凝胶。研究了SA/SHA气凝胶在水溶液中对Cu（II）的吸附特性及其机理。结果表明，SA/SHA气凝胶对Cu（II）的最大吸附量可达188.38 mg/g。结果与拟二级动力学模型和Langmuir等温线模型吻合良好，表明气凝胶表面的吸附位点分布均匀，主要由化学吸附介导的Cu（II）的单层吸附驱动。对吸附过程中重金属浸出的检测证实，经SA/SHA处理后的溶液中没有二次污染。对共离子存在的研究表明，一价阳离子对SA/SHA气凝胶对Cu（II）的选择性吸附影响很小，而二价阳离子的影响更为显著。此外，即使经过5次吸附-解吸循环，SA/SHA气凝胶仍保持其结构完整性而未发生崩解。表征技术表明，SA/SHA气凝胶的吸附机理以络合反应和阳离子离子交换为主，氧化还原反应为辅。

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来源期刊

Journal of contaminant hydrology 环境科学-地球科学综合

CiteScore

6.80

自引率

2.80%

发文量

129

审稿时长

68 days

期刊介绍： The Journal of Contaminant Hydrology is an international journal publishing scientific articles pertaining to the contamination of subsurface water resources. Emphasis is placed on investigations of the physical, chemical, and biological processes influencing the behavior and fate of organic and inorganic contaminants in the unsaturated (vadose) and saturated (groundwater) zones, as well as at groundwater-surface water interfaces. The ecological impacts of contaminants transported both from and to aquifers are of interest. Articles on contamination of surface water only, without a link to groundwater, are out of the scope. Broad latitude is allowed in identifying contaminants of interest, and include legacy and emerging pollutants, nutrients, nanoparticles, pathogenic microorganisms (e.g., bacteria, viruses, protozoa), microplastics, and various constituents associated with energy production (e.g., methane, carbon dioxide, hydrogen sulfide). The journal''s scope embraces a wide range of topics including: experimental investigations of contaminant sorption, diffusion, transformation, volatilization and transport in the surface and subsurface; characterization of soil and aquifer properties only as they influence contaminant behavior; development and testing of mathematical models of contaminant behaviour; innovative techniques for restoration of contaminated sites; development of new tools or techniques for monitoring the extent of soil and groundwater contamination; transformation of contaminants in the hyporheic zone; effects of contaminants traversing the hyporheic zone on surface water and groundwater ecosystems; subsurface carbon sequestration and/or turnover; and migration of fluids associated with energy production into groundwater.