从模拟酸性矿山废水中创新回收基质层状双氢氧化物，用于去除废水中的铜和镉。
Innovative recovery of matrix layered double hydroxide from simulated acid mine wastewater for the removal of copper and cadmium from wastewater.
机构信息
School of Resources and Environmental Engineering, Hefei University of Technology, Hefei, 230009, Anhui, China.
Anhui Engineering Research Center of Industrial Wastewater Treatment and Resource Recovery, Hefei University of Technology, Hefei, 230009, Anhui, China.
出版信息
Environ Sci Pollut Res Int. 2024 Apr;31(20):30196-30211. doi: 10.1007/s11356-024-33262-5. Epub 2024 Apr 11.
This study innovatively added biochar to optimize regulation in the neutralization process of simulated acid mine drainage (AMD) and recovered a new type of matrix layered double hydroxides (MLDH), which can be used to remove copper (Cu(II)) and cadmium (Cd(II)) from wastewater. A series of batch experiments show that MLDH with strong selective removal ability of Cu(II) and Cd(II) can be successfully obtained by adding biochar (BC) at pH = 5 end in the neutralization process. Kinetic and isotherm modeling studies indicated that the removal of Cu(II) and Cd(II) by the MLDH was a chemical multilayer adsorption process. The removal mechanism of Cu(II) and Cd(II) was further analyzed through related characterization analysis with contribution rate calculation: the removal rates of Cu(II) and Cd(II) by ion exchange were 42.7% and 26%, while that by precipitation were 34.5% and 49.9%, respectively. This study can provide a theoretical reference and experimental basis for the recovery and utilization of valuable by-products in AMD and the treatment of heavy metal wastewater.
本研究创新性地添加生物炭来优化模拟酸性矿山排水（AMD）的中和过程，并回收了一种新型的基质层状双氢氧化物（MLDH），可用于去除废水中的铜（Cu(II)）和镉（Cd(II)）。一系列批处理实验表明，在中和过程中在 pH=5 结束时添加生物炭（BC），可以成功获得对 Cu(II)和 Cd(II)具有强选择性去除能力的 MLDH。动力学和等温线模型研究表明，MLDH 对 Cu(II)和 Cd(II)的去除是一个化学多层吸附过程。通过相关的特征分析和贡献率计算进一步分析了 Cu(II)和 Cd(II)的去除机制：离子交换的 Cu(II)和 Cd(II)去除率分别为 42.7%和 26%，而沉淀的去除率分别为 34.5%和 49.9%。本研究可为 AMD 中有价副产物的回收利用和重金属废水的处理提供理论参考和实验依据。
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