CAS Key Laboratory of Design and Assembly of Functional Nanostructures, Fujian Key Laboratory of Nanomaterials, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, 350002, PR China; Fujian Research Center for Rare Earth Engineering Technology, Xiamen Institute of Rare Earth Materials, Haixi Institute, Chinese Academy of Sciences, Xiamen, 361021, PR China; Faculty of Materials Metallurgy and Chemistry, Jiangxi University of Science and Technology, Ganzhou, 341000, PR China.
Faculty of Materials Metallurgy and Chemistry, Jiangxi University of Science and Technology, Ganzhou, 341000, PR China.
J Environ Manage. 2022 Feb 15;304:114164. doi: 10.1016/j.jenvman.2021.114164. Epub 2021 Dec 1.
A novel method for the selective removal and recovery of copper ion from copper-containing wastewater by extraction-precipitation with p-tert-octyl phenoxy acetic acid as a precipitant is presented. The morphology, thermal stability and solubility of POAA were synthesized and characterized. Then the application of POAA to precipitate copper from simulated copper-containing wastewater was studied. The effects of some factors (i.e., time, pH, temperature, dosage of precipitant) on copper precipitation efficiency (P%) and water solubility of POAA were discussed. The extraction-precipitation mechanism of POAA and Cu was investigated by slope analysis combined with SEM, EDS, XPS and IR spectra. The concentration and purity of copper from industrial wastewater increased from 100.2 mg/L to 27,916 mg/L and 13.71%-93.01% respectively, treating by the proposed extraction-precipitation. Moreover, POAA revealed good stability in the recycling processes. Extraction-precipitation strategy is simple, efficient and sustainable, which can effectively reduce the volume of sludge in the process of wastewater treatment and produce copper concentrated solution with industrial value, which has revealed application potential for the clean production of copper smelting enterprises.
提出了一种从含铜废水中选择性萃取沉淀回收铜离子的新方法，以对叔辛基酚氧乙酸（POAA）作为沉淀剂。合成并表征了 POAA 的形态、热稳定性和溶解度。然后研究了 POAA 从模拟含铜废水中沉淀铜的应用。讨论了一些因素（如时间、pH 值、温度、沉淀剂用量）对铜沉淀效率（P%）和 POAA 水溶性的影响。通过斜率分析结合 SEM、EDS、XPS 和 IR 光谱研究了 POAA 和 Cu 的萃取沉淀机理。采用所提出的萃取沉淀法，工业废水中铜的浓度和纯度分别从 100.2mg/L 提高到 27916mg/L 和 13.71%-93.01%。此外，POAA 在回收过程中表现出良好的稳定性。萃取沉淀策略简单、高效、可持续，可有效减少废水处理过程中污泥的体积，并产生具有工业价值的铜浓缩溶液，为铜冶炼企业的清洁生产展示了应用潜力。
