Key Laboratory of Drinking Water Science and Technology, Research Centre for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, China.
Key Laboratory of Drinking Water Science and Technology, Research Centre for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, China; School of Energy and Environment, Zhongyuan University of Technology, Zhengzhou, 450007, China.
Chemosphere. 2023 May;324:138297. doi: 10.1016/j.chemosphere.2023.138297. Epub 2023 Mar 7.
The application of commercial membranes is limited by the secondary pollution such as the usage of toxic chemicals for the membrane preparation and the disposal of aged membranes. Therefore, the green and environmentally friendly membranes are extremely promising for the sustainable development of membrane filtration in water treatment. In this study, the comparison of wood membrane with the pore size of tens microns (μm) and polymer membrane with the pore size of 0.45 μm was made to study the heavy metals removal in drinking water treatment by gravity-driven membrane (GDM) filtration system, and there was an improvement in the removal of Fe, Cu and Mn by wood membrane. The sponge-like structure of fouling layer for wood membrane made the retention time of heavy metals prolonged in contrast to the cobweb-like structure of polymer membrane. The carboxylic group (-COOH) content of fouling layer for wood membrane was greater than that for polymer membrane. Additionally, the population abundance of heavy metal-capturing microbes on the surface of wood membrane was higher compared with polymer membrane. The wood membrane provides a promising route to producing facile, biodegradable and sustainable membrane as a green alternative to polymer membranes in heavy metal removal from drinking water.
商业膜的应用受到二次污染的限制，例如在膜制备过程中使用有毒化学品以及老化膜的处理。因此，绿色环保膜对于水处理中膜过滤的可持续发展极具前景。在这项研究中，比较了孔径为几十微米（μm）的木质膜和孔径为 0.45μm 的聚合物膜，以研究重力驱动膜（GDM）过滤系统对饮用水中重金属的去除效果，木质膜在去除 Fe、Cu 和 Mn 方面有了一定的提升。木质膜的多孔层具有海绵状结构，与聚合物膜的蛛网状结构相比，重金属的停留时间延长。木质膜多孔层的羧酸基团（-COOH）含量大于聚合物膜。此外，木质膜表面捕获重金属的微生物丰度高于聚合物膜。木质膜为生产简便、可生物降解和可持续的膜提供了一条有前景的途径，可作为去除饮用水中重金属的聚合物膜的绿色替代品。
