Floatable Fe-TiO_(2)/hydrogel composite for photodegradation of water pollutants  

可漂浮单原子铁-TiO_(2)/水凝胶复合材料用于光催化降解水体中污染物

作　　者：Ying-Ying Jiao Zhi-Yong Cheng Hao Luo Qiu-Ping Zhao Xue-Yan Xiang Zhi-Ming Zhang 焦莹莹;程志勇;罗浩;赵秋平;向雪艳;张志明

机构地区：[1]Institute for New Energy Materials and Low Carbon Technologies,School of Materials Science and Engineering,Tianjin University of Technology,Tianjin 300381,China

出　　处：《Science China Materials》2024年第12期4013-4020,共8页中国科学（材料科学）（英文版）

摘　　要：The development of highly efficient and low-cost photocatalysts for degradation of organic pollutants become an effective approach for environmental remediation.However,the practical application of traditional powder catalyst in photocatalytic technology is limited due to its low recycling capacity,agglomeration and secondary pollution risk.Herein,a floating Fe-doped TiO_(2) and hydrogel(FTH)composite was synthesized for the photodegradation of Rhodamine B via a facile impregnation method.The photodegradation results show that the FTH composite exhibits a higher photocatalytic efficiency with degradation percentage(95.6%)compared with pure TiO_(2)(41.2%).The enhanced photocatalytic performance is attributed to its excellent flotation performance,providing a large number of active sites for pollutant degradation,contact with O_(2) and photons at the air/water interface.Remarkably,the adsorbed Rhodamine B in FTH can still be removed by exposing to light in the air alone,demonstrating strong recovery ability of the FIH composite catalyst.The floatable hydrogel nanocomposites offer a promising solution for scalable solar-drive degradation of water pollutants,paving the way for sustainable water treatment technologies.开发高效、低成本的光催化剂降解有机污染物已成为环境修复的有效途径.然而,传统粉末催化剂在光催化技术中的实际应用受到回收能力低、聚集和二次污染等风险的限制.本文采用简易的浸渍法合成了一种漂浮的单原子铁掺杂TiO_(2)(FTH)复合材料,用于罗丹明B的降解.光降解结果表明,与TiO_(2)相比,FTH复合材料具有更高的光催化效率,降解率为95.6%.优异的漂浮性为污染物在空气/水界面与光催化剂、O_(2)发生光反应提供了大量的反应位点,从而增强了光催化性能.同时,吸附在FTH表面的罗丹明B单独在空气中光照仍能被快速去除,说明FTH在空气中即可降解RhB,表现出较强的自净化与自恢复能力.本研究提出的可漂浮水凝胶纳米复合材料为太阳能降解水体污染物提供了潜在解决方案.

关 键 词：TiO_(2) PHOTOCATALYSIS HYDROGELS DEGRADATION 

分 类 号：O643.36[理学—物理化学] O644.1[理学—化学] X703[环境科学与工程—环境工程]