外场辅助光催化机理及降解有机污染物研究进展

Field-assisted photocatalysis mechanism and degradationof organic pollutants: A review

摘要:

光催化技术能够利用太阳能生成自由基对有机污染物进行矿化降解,具有绿色、节能、无污染的优势,被认为是最有前景的高级氧化技术,目前研究集中于提升光催化技术的降解效率。而采用电场、超声场等外场辅助的方法能够通过提高溶液传质效率、抑制载流子复合、提高自由基产率等途径,进一步提高光催化效率。综述了电场、热场、微波场、超声场、磁场5种外场各自辅助光催化降解有机污染物的研究进展和应用现状,重点介绍了外场提升光催化降解效率的主要机理,归纳了每种外场辅助技术的优缺点,对其在应用中面临的问题进行总结,并对未来研究和发展方向进行了展望。

Abstract:

Photocatalysis can generate free radicals to degrade and mineralize organic pollutants by absorbing solar energy, which has the advantages of green, energy saving, and pollution-free. Photocatalysis is considered to be the most promising advanced oxidation technology. The current research focuses on improving the degradation efficiency of photocatalytic technology. The use of external field-assisted methods, such as electric field and ultrasonic field, can further improve the photocatalytic efficiency by improving the mass transfer efficiency of the solution, suppressing the carrier recombination, and improving the free radical yield. The research progress and application status of the five external fields assisted in photocatalytic degradation of organic pollutants are reviewed, including electric field, thermal field, microwave field, ultrasonic field and magnetic field. The main mechanism of external field to improve photocatalytic degradation efficiency is highlighted. The advantages and disadvantages are summarized, and the problems faced in practical applications are presented. The future research and development directions are prospected.