Thiourea-modified magnetic sodium alginate pellets for passivation of lead and cadmium in soil: Preparation, properties, and mechanisms

文献类型： 外文期刊

第一作者： Meng, Fansong

作者： Meng, Fansong;Gao, Hang;Wang, Nanfang;Liao, Yuwei;Su, Xuanyu;Gui, Jing;Qu, Jianhua;Zhang, Ying;Fan, Hongli

作者机构：

关键词： Sodium alginate; Thiourea; N/S functional group; Lead; Cadmium

期刊名称：JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING （ 影响因子：7.2； 五年影响因子：7.6 ）

ISSN： 2213-2929

年卷期： 2025 年 13 卷 5 期

页码：

收录情况： SCI

摘要： Thiourea modified magnetic sodium alginate pellets (NCS@MSA) were synthesized through the hydrothermal process to efficiently immobilize lead (Pb) and cadmium (Cd) in contaminated soil. NCS@MSA exhibited excellent adsorption performance across an extensive pH range, achieving maximum adsorption capacities of 406.79/185.66 mg/g for Pb(II)/Cd(II). Kinetic experiments showed that the adsorption process could be most accurately represented by the pseudo-second-order and Avrami fractional-order models, indicating a composite adsorption mechanism dominated by chemisorption. Thermodynamic analyses further confirmed that the adsorption process was exothermic and spontaneous. After 21 days of soil remediation, the Pb and Cd contents significantly decreased from 221.56 and 1.462 mg/kg to 70.48 and 0.296 mg/kg. Soil leaching experiments demonstrated that NCS@MSA effectively immobilized Pb and Cd, which reduced their exchangeable and carbonate-bound fractions by 56.23 % and 50.36 % while promoting transformation into stable residual phases. The stabilization mechanisms included pore filling, complexation, and electrostatic attraction. In summary, the hydrothermally synthesized NCS@MSA is a potential passivation for the remediation of heavy metal-contaminated soils, offering significant potential for environmental applications.

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