Mercapto-modified layered double hydroxide: High-efficiency emerging amendment for cadmium immobilization in cadmium-contaminated acidic and alkaline soil
文献类型: 外文期刊
作者: Gao, Xusheng;Chen, Xilin;Shu, Yifei;Chen, Kexin;Gao, Ge;Liu, Xiaomin;Huang, Qingqing;Wang, Lin;Sun, Yuebing;Zhao, Yujie;Liang, Xuefeng
作者机构:
关键词: Mercapto;Layered double hydroxide;Immobilization;Cadmium;Soil
期刊名称: JOURNAL OF HAZARDOUS MATERIALS
ISSN: 0304-3894
年卷期: 2025 年 498 卷
页码:
收录情况: SCIE(2025版) ; ; EI(2025版)
摘要: Soil cadmium (Cd) contamination has emerged as a critical environmental challenge in Chinese agricultural systems. The remediation of Cd-contaminated farmland necessitates high-efficiency immobilization amendments. The present study successfully synthesized mercapto-modified MgAl-and ZnAl-layered double hydroxides (MgAl/ZnAl-MP-LDHs) as structurally stable and high-performance amendments via a coprecipitationcondensation method. Batch adsorption experiments revealed superior Cd2 + sorption capacities for MP-LDHs, with the maximum Cd2+ capacities increased by 1.6-1.8 times compared to the unmodified materials. The XPS analysis further elucidated the dual sorption mechanisms involve in Cd2+ absorption by MP-LDHs: complexation via mercapto groups and precipitation mediated by hydroxyl groups. Moreover, soil application of MP-LDHs at 0.025 % dosage (w/w) demonstrated rapid immobilization efficacy, reducing available Cd content by 38.41 %-93.20 % within 24 h in alkaline and acidic soil. Subsequent analysis revealed that MP-LDHs exhibited pH-resilient performance in soil Cd immobilization. Potting experiment further validated practical
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