Abstract:

Titanium dioxide (TiO₂) can generate active groups with strong oxidation properties under light activation, and activated carbon (AC) has good adsorption performance. TiO₂/AC composite materials prepared by supporting TiO₂ on AC can remove most refractory organic pollutants effectively; Consequently, it has prospective applications in environmental purification. In this paper, we review the research status of TiO₂/AC composites, and introduce three major TiO₂/AC composite preparation technologies, including the sol-gel method, solvent-thermal method, and microwave synthesis method. Materials prepared using the sol-gel method are stable, the solvent-thermal method has mild preparation conditions, and the microwave synthesis method has relatively short cycle. We also introduce current TiO₂ modification methods, such as ion doping, semiconductor composite, and noble metal deposition, which are aimed at addressing low visible light absorption and low quantum utilization. In addition, we summarize the applications of TiO₂/AC composite material in the removal of refractory organic pollutants (e.g., dye wastewater, drugs, phenols, and volatile organic compounds). Finally, we outline the challenges encountered in modification attempts and during the application of TiO₂/AC composite materials, and their potential solutions. This review could provide a reference for further comprehensive investigations on TiO₂/AC composite materials and facilitate their large-scale industrial production and application.

Key words: TiO₂/AC composite materials, preparation, catalyst, ion doping, semiconductor recombination, precious metal deposition, environment

摘要：

二氧化钛（TiO₂）在光照下可以产生具有强氧化性能的活性基团，活性炭（AC）具有良好的吸附性能。将TiO₂负载在AC上制备的TiO₂/AC复合材料可以有效去除大部分难降解的有机污染物，因此在环境净化领域具有良好的应用前景。本文综述了TiO₂/AC复合材料的研究现状，介绍了目前TiO₂/AC复合材料的三种主要制备工艺：溶胶-凝胶法、溶剂热法和微波合成法。其中溶胶-凝胶法所制备的材料稳定性好、溶剂热法制备条件温和、微波合成法制备周期短。针对TiO₂/AC复合材料可见光吸收率低和量子利用率低等问题，介绍了离子掺杂、半导体复合、贵金属沉积等现有的TiO₂/AC复合材料改性方法。之后，概述了所制备的TiO₂/AC复合材料在去除难降解有机污染物（染料废水、药物类、酚类、挥发性有机物）中的应用。最后展望了TiO₂/AC复合材料在改性研究与实际应用过程中存在的挑战性问题及可行的解决方法，为TiO₂/AC复合材料深入研究和大规模工业生产应用提供参考。

关键词: TiO₂/AC复合材料, 制备, 催化剂, 离子掺杂, 半导体复合, 贵金属沉积, 环境