Wei Gaoliang, Dong Jun, Bai Jing, Zhao Yongsheng, Qin Chuanyu
Key Laboratory of Groundwater Resources and Environment (Ministry of Education, China), College of New Energy and Environment, Jilin University, Changchun 130021, China.
Materials (Basel). 2020 Jan 14;13(2):378. doi: 10.3390/ma13020378.
Developing low-cost, durable, and high-performance materials for the separation of water/oil mixtures (free oil/water mixtures and emulsions) is critical to wastewater treatment and resource recovery. However, this currently remains a challenge. In this work, we report a biopolymer microfiber assembly, fabricated from the recovery of tissue waste, as a low-cost and high-performance filter for oily wastewater treatment. The microfiber filters demonstrate superhydrophilicity (water contact angle of 28.8°) and underwater superoleophobicity (oil contact angle of 154.2°), and thus can achieve separation efficiencies of >96% for both free oil/water mixtures and surfactant-stabilized emulsions even in highly acidic (pH 2.2)/alkaline (pH 11.8) conditions. Additionally, the prepared microfiber filters possess a much higher resistance to oil fouling than conventional membranes when filtering emulsions, which is because the large-sized 3D interconnected channels of the filters can delay the formation of a low-porosity oil gel layer on their surface. The filters are expected to practically apply for the oily wastewater treatment and reduce the amount of tissue waste entering the environment.
开发用于分离水/油混合物（游离油/水混合物和乳液）的低成本、耐用且高性能的材料对于废水处理和资源回收至关重要。然而，目前这仍然是一个挑战。在这项工作中，我们报告了一种由回收组织废料制成的生物聚合物微纤维组件，作为一种用于含油废水处理的低成本高性能过滤器。微纤维过滤器表现出超亲水性（水接触角为28.8°）和水下超疏油性（油接触角为154.2°），因此即使在高酸性（pH 2.2）/碱性（pH 11.8）条件下，对于游离油/水混合物和表面活性剂稳定的乳液，分离效率均可达到>96%。此外，在过滤乳液时，制备的微纤维过滤器比传统膜具有更高的抗油污能力，这是因为过滤器的大尺寸三维互连通道可以延缓其表面低孔隙率油凝胶层的形成。这些过滤器有望实际应用于含油废水处理，并减少进入环境的组织废料量。
