Key Laboratory of Novel Biomass-Based Environmental and Energy Materials in Petroleum and Chemical Industry, Hubei Novel Reactor & Green Chemical Technology Key Laboratory, Key Laboratory for Green Chemical Process of Ministry of Education, School of Chemistry and Environmental Engineering, Wuhan Institute of Technology, Wuhan, China.
Key Laboratory of Novel Biomass-Based Environmental and Energy Materials in Petroleum and Chemical Industry, Hubei Novel Reactor & Green Chemical Technology Key Laboratory, Key Laboratory for Green Chemical Process of Ministry of Education, School of Chemistry and Environmental Engineering, Wuhan Institute of Technology, Wuhan, China; School of Biological Engineering, Wuhan Polytechnic, Wuhan, China.
J Environ Manage. 2022 Nov 15;322:116157. doi: 10.1016/j.jenvman.2022.116157. Epub 2022 Sep 5.
Potentially toxic elements including lead (Pb), manganese (Mn), and copper (Cu) released from copper tailings would cause severe long-term environmental risks and potential threats to human health. To prevent these negative effects caused by the release of the metals, a novel magnetic carboxyl groups modified bagasse with high adsorption affinity and strong magnetism was synthesized through an in-situ precipitation method and used to simultaneously remove Pb, Mn, and Cu from the eluate of copper tailings. Results showed that release of Pb, Mn, and Cu from the copper tailings was pH, time, and particle size dependent, and maximum concentrations of them released in the eluate was 1.7, 1.9, and 4.1 mg L under weak acid conditions. Batch adsorption experiment showed that the as-synthesized magnetic modified bagasse could selectively absorb Pb, Mn, and Cu from a complex solution with adsorption capacity of 137.3, 13.1, and 90.0 mg g, respectively. X-ray photoelectron spectroscopy (XPS) and energy dispersive spectroscopy-mapping (EDS-mapping) demonstrated that Pb, Mn, and Cu interacted with the magnetic modified biosorbent mainly through coordination and ion exchange. Column experiments showed that higher than 99.5% of the released Pb, Mn, and Cu could be simultaneously removed by the magnetic modified bagasse, and the maximum concentrations of them released in the eluate of the copper tailings were all decreased to lower than 0.01 mg L, which reached the discharge standards. After recycled by a magnet, the magnetic modified bagasse could be collected easily and used repeatedly. Because of the high efficiency and easy recovery, the used method had great practical application value in removal of potentially toxic elements released from metallic tailings.
从铜尾矿中释放的潜在有毒元素，包括铅 (Pb)、锰 (Mn) 和铜 (Cu)，将对环境造成严重的长期风险和潜在威胁人类健康。为了防止这些金属释放造成的负面影响，通过原位沉淀法合成了一种新型具有高吸附亲和力和强磁性的磁性羧基修饰蔗渣，用于同时从铜尾矿浸出液中去除 Pb、Mn 和 Cu。结果表明，铜尾矿中 Pb、Mn 和 Cu 的释放受 pH 值、时间和粒径的影响，在弱酸条件下，它们在浸出液中的最大浓度分别为 1.7、1.9 和 4.1mg/L。批处理吸附实验表明，所合成的磁性改性蔗渣可从复杂溶液中选择性地吸附 Pb、Mn 和 Cu，吸附容量分别为 137.3、13.1 和 90.0mg/g。X 射线光电子能谱 (XPS) 和能量色散光谱 - 映射 (EDS-mapping) 表明 Pb、Mn 和 Cu 主要通过配位和离子交换与磁性改性生物吸附剂相互作用。柱实验表明，磁性改性蔗渣可同时去除 99.5%以上释放的 Pb、Mn 和 Cu，且铜尾矿浸出液中它们的最大浓度均降低至 0.01mg/L 以下，达到排放标准。用磁铁回收后，磁性改性蔗渣易于收集并可重复使用。由于效率高、易于回收，该方法在去除金属尾矿中释放的潜在有毒元素方面具有很大的实际应用价值。
