Marine Engineering College, Dalian Maritime University, Dalian, 116026, China; College of Environmental Science and Engineering, Dalian Maritime University, Dalian, 116026, China.
College of Environmental Science and Engineering, Dalian Maritime University, Dalian, 116026, China.
Chemosphere. 2023 Sep;336:139310. doi: 10.1016/j.chemosphere.2023.139310. Epub 2023 Jun 22.
Solar interfacial evaporation is a potential technology to produce clean water due to its simplicity and being driven by renewable clean energy, but it still requires further development to break through the bottleneck of removing volatile organic compounds (VOCs), especially in wastewater treatment. Herein, we proposed a dual-functional hydrogel evaporator that coupled solar interfacial evaporation with Fenton reaction to simultaneously remove VOCs and non-volatile pollutants from water with low energy consumption and high efficiency. The evaporator was composed with β-FeOOH and polydopamine (PDA) on an electrospun nanofibrous hydrogel. Arising from the PDA with excellent photothermal properties, the evaporator revealed a high light absorption characteristics (∼90%) and photothermal efficiency (83.4%), which ensured a favorable evaporation rate of 1.70 kg m h under one solar irradiation. More importantly, benefited from the coupled Fenton reaction, the VOCs removal rate of β-FeOOH@PDA/polyvinyl alcohol nanofibrous hydrogel (β-FeOOH@PPNH) reached 95.8%, which was 6.5 times than that of sole solar interfacial evaporation (14.8%). In addition, the evaporator exhibited an outstanding non-volatile pollutant removal capability and stable removal performance for organic pollutants over a long period of operation. The prepared β-FeOOH@PPNH evaporator provides a promising idea for simultaneous removal of non-volatile pollutants and volatile pollutants performance in long-term water purification.
太阳能界面蒸发因其简单性和由可再生清洁能源驱动而成为生产清洁水的潜在技术，但仍需要进一步发展以突破去除挥发性有机化合物（VOCs）的瓶颈，特别是在废水处理中。在此，我们提出了一种双重功能水凝胶蒸发器，将太阳能界面蒸发与芬顿反应相结合，以低能耗和高效率同时去除水中的 VOCs 和非挥发性污染物。蒸发器由β-FeOOH 和聚多巴胺（PDA）组成，负载在电纺纳米纤维水凝胶上。由于 PDA 具有优异的光热性能，蒸发器表现出高的光吸收特性（∼90%）和光热效率（83.4%），确保在一个太阳照射下具有 1.70kg m h 的良好蒸发速率。更重要的是，得益于耦合的芬顿反应，β-FeOOH@PDA/聚乙烯醇纳米纤维水凝胶（β-FeOOH@PPNH）的 VOCs 去除率达到 95.8%，是单纯太阳能界面蒸发（14.8%）的 6.5 倍。此外，该蒸发器表现出优异的非挥发性污染物去除能力和对有机污染物的长期稳定去除性能。所制备的β-FeOOH@PPNH 蒸发器为长期水净化中同时去除非挥发性污染物和挥发性污染物提供了有前景的思路。
