金属氧化物催化臭氧氧化机理研究进展

A Review of Research on the Mechanism of Metal Oxide Catalytic Ozonation

催化臭氧氧化技术是目前水处理研究的热点,其中金属氧化物是催化臭氧化最常用的催化剂之一,因价格便宜、具有良好的催化性能备受关注。由于催化反应机理复杂,臭氧分子在催化剂表面的分解产物多样,同一种催化剂的催化臭氧化机理存在争议。文章讨论了金属氧化物催化臭氧化中发现的多种机理,主要包括羟基自由基机理、超氧自由基机理、表面络合配位机理和表面氧原子机理;催化剂表面性质影响臭氧分子的分解方式,分别探讨了表面羟基和表面氧空位存在时对催化反应机理的影响,发现表面羟基和氧空位的存在可以促进臭氧分子进一步解离,在诱导臭氧分子分解中起关键作用;讨论了金属氧化物催化臭氧化机理研究的发展趋势,为实际应用提供参考。

Catalytic ozonation has been considered as the most promising method for treatment of wastewater.As one of the most commonly used catalysts in application,metal oxides have attracted significant attention due to their low price and good catalytic performance.The decomposition products of ozone molecules on the catalyst surface are diverse,the mechanism is complicated and controversial.The various mechanisms of metal oxide catalyzed ozonation,such as free radical mechanism,superoxide radical mechanism,surface complex coordination mechanism and surface oxygen atoms mechanism were discussed.The surface properties including surface hydroxyl and surface oxygen vacancies may facilitate ozone molecule further dissociation,play a key role in the decomposition of ozone molecules,and affect the catalytic mechanism.The future development of catalytic ozonation are also discussed,which would provide suggestion for practical application.