黑色TiO2纳米管阵列膜光蒸发处理高盐废水中膜分离与光催化的协同作用机制研究

高盐废水由于成分复杂，盐分、有机污染物浓度高，其处理是极具挑战性的难题。本项目将太阳能表面光蒸发技术应用于高盐废水处理，其中，如何制备光热转换效率高的光热材料、避免光蒸发过程中盐结晶、降低有机污染物对光热材料及冷凝水的污染是关键问题。针对上述问题，重点开展以下三个方面的研究：1、通过制备具有垂直有序多孔结构的黑色TiO2纳米管阵列膜，获得光热转换效率高的光热材料，揭示垂直有序多孔结构与光热蒸发效率之间的构效关系及作用机理；2、通过超疏水改性黑色TiO2纳米管阵列膜，构建多层次浸润性的超疏水/超亲水Janus结构，明晰超疏水/超亲水Janus结构抑制光热材料表面和孔内结晶的机理；3、通过分析黑色TiO2纳米管阵列膜的膜分离与光催化性能，阐明太阳能表面光热蒸发处理高盐废水中膜分离/光催化协同去除有机污染物的机制。本项目将为太阳能表面光蒸发处理高盐废水提供理论和技术支撑。

The composition of high salinity wastewater is complex. Due to the high salt content, the growth of microorganism is suppressed, thus the treatment of high salinity wastewater is challenging. Here, this project propose to use solar driven interfacial evaporation to deal with the high salinity wastewater, in which, how to prepare high performance photothermal materials, to avoid the salt fouling and negative effect of organic pollutants in the high salinity wastewater are the key problems. To address these issues: (1) The method to fabricate black TiO2 nanotube array membranes was explored, the mechanism behind the effect of vertically ordered pore structures on solar evaporation performance such as light absorption, light to heat ratio, evaporation rate was investigated; (2) Black TiO2 nanotube array membranes with super-hydrophobic/super-hydrophilc properties was fabrication via surface modification, the influence of the super-hydrophobic/super-hydrophilc properties on the salt rejection of the membrane during solar evaporation was studied; (3) The separation ability and photocatalysis of the black TiO2 nanotube array membranes were evaluated. Assisted by the membrane separation and photocatalysis functions of black TiO2 nanotube array membranes, the high salinity wastewater was treated by the membranes via solar driven interfacial evaporation.