Cheng Yuhang, Xiong Zhu, Mahmud Sakil, Lu Jiangyan, Dong Kaige, He Siqi, Zhang Hongguo, Xiang Yang, Zhang Wei, Xiao Tangfu, Zhao Shuaifei, Zhang Liguo, Zhang Gaosheng
Key Laboratory for Water Quality and Conservation of the Pearl River Delta, Ministry of Education, School of Environmental Science and Engineering, Guangzhou University, Guangzhou, Guangdong, 510006, China; Quzhou Membrane Material Innovation Institute, Quzhou, 323000, China.
Key Laboratory for Water Quality and Conservation of the Pearl River Delta, Ministry of Education, School of Environmental Science and Engineering, Guangzhou University, Guangzhou, Guangdong, 510006, China.
Chemosphere. 2024 Sep;363:142807. doi: 10.1016/j.chemosphere.2024.142807. Epub 2024 Jul 9.
As trace levels of thallium (Tl) in water are lethal to humans and ecosystems, it is essential to exploit advanced technologies for efficient Tl removal. In response to this concern, an innovative composite membrane was developed, incorporating polytetrafluoroethylene (PTFE) and featuring a dual-support system with polydopamine (PDA) and polyethyleneimine (PEI), along with bimetallic Prussian blue analogues (Co@Fe-PBAs) as co-supports. The composite membrane exhibited an exceptional Tl-adsorption capacity (q) of 186.1 mg g when utilized for the treatment of water containing low concentration of Tl (0.5 mg⋅L). Transmission electron microscopy displayed the obvious Tl mapping inside the special hollow Co@Fe-PBAs crystals, demonstrating the deep intercalation of Tl via ion exchange and diffusion. The Tl-adsorption capability of the composite membrane was not greatly affected by coexisting Na, Ca and Mg as well as the tricky K, indicating the excellent anti-interference. Co-doped PBAs enhanced ion exchange and intercalation of the composite membrane with Tl leading to excellent Tl removal efficiency. The composite membrane could efficiently remove Tl from thallium-contaminated river water to meet the USEPA standard. This study provides a cost-effective membrane-based solution for efficient Tl removal from Tl-containing wastewater.
由于水中痕量铊（Tl）对人类和生态系统具有致死性，因此开发先进技术以高效去除铊至关重要。针对这一问题，研发了一种创新的复合膜，它以聚四氟乙烯（PTFE）为基础，具有由聚多巴胺（PDA）和聚乙烯亚胺（PEI）组成的双支撑体系，同时还有双金属普鲁士蓝类似物（Co@Fe-PBAs）作为共支撑体。当用于处理含低浓度铊（0.5 mg·L）的水时，该复合膜表现出186.1 mg g的出色铊吸附容量（q）。透射电子显微镜显示在特殊的中空Co@Fe-PBAs晶体内部有明显的铊映射，表明铊通过离子交换和扩散进行了深度嵌入。复合膜对铊的吸附能力不受共存的Na、Ca、Mg以及棘手的K的显著影响，显示出出色的抗干扰能力。共掺杂的PBAs增强了复合膜与铊的离子交换和嵌入，从而实现了出色的铊去除效率。该复合膜能够从受铊污染的河水中有效去除铊，达到美国环境保护局的标准。本研究为从含铊废水中高效去除铊提供了一种经济高效的基于膜的解决方案。
