Study on the adsorption properties of Cr( vi ), Cu( ii ) and Cd( ii ) in acid mine wastewater by coal gangue loaded nano-FeS

作者：Xuying Guo, Wei Sun, Honglei Fu, Zilong Zhao, Xiaoyue Zhang, Fanbo Meng, Yanrong Dong · 发表于：RSC Advances · 年份：2025 · DOI：10.1039/d5ra04083c · 被引用次数：8 · 研究领域：Mine drainage and remediation techniques、Adsorption and biosorption for pollutant removal、Metal Extraction and Bioleaching

and reaction time of 155 min. The best removal rates were 94.08%, 84.08% and 71.36%, respectively. The adsorption of Cr(vi), Cu(ii), and Cd(ii) by nFeS-CG conformed to the Langmuir model and the pseudo-second-order kinetic model, indicating that the adsorption process was monolayer adsorption and was dominated by chemical adsorption. The thermodynamic results showed that the adsorption process was an endothermic process, and the temperature rise was beneficial to the adsorption. The characterization results and mechanism analysis showed that the removal mechanism of Cr(vi), Cu(ii) and Cd(ii) by nFeS-CG was mainly electrostatic adsorption, redox and precipitation. Co-existing ions, leaching toxicity and recycling experiments proved nFeS-CG's strong practical application potential as a low-cost adsorbent for simultaneous removal of multiple heavy metals in AMD. This study provides technical reference for coal gangue utilization and AMD remediation.