Visible-Light Photocatalytic Ozonation Using Graphitic C 3 N 4 Catalysts: A Hydroxyl Radical Manufacturer for Wastewater Treatment

作者：Jiadong Xiao, Yongbing Xie, Jabor Rabeah, Angelika Brückner, Hongbin Cao · 发表于：Accounts of Chemical Research · 年份：2020 · DOI：10.1021/acs.accounts.9b00624 · 被引用次数：163 · 研究领域：Advanced Photocatalysis Techniques、Perovskite Materials and Applications、Advanced Nanomaterials in Catalysis

Conspectus Photocatalytic ozonation (light/O 3 /photocatalyst), an independent advanced oxidation process (AOP) proposed in 1996, has demonstrated over the past two decades its robust oxidation capacity and potential for practical wastewater treatment using sunlight and air (source of ozone). However, its development is restricted by two main issues: (i) a lack of breakthrough catalysts working under visible light (42–43% of sunlight in energy) as well as ambiguous property–activity relationships and (ii) unclear fundamental reasons underlying its high yield of hydroxyl radicals ( • OH). In this Account, we summarize our substantial contributions to solving these issues, including (i) new-generation graphitic carbon nitride (g-C 3 N 4 ) catalysts with excellent performance for photocatalytic ozonation under visible light, (ii) mechanisms of charge carrier transfer and reactive oxygen species (ROS) evolution, (iii) property–activity relationships, and (iv) chemical and working stabilities of g-C 3 N 4 catalysts. On this basis, the principles/directions for future catalyst design/optimization are discussed, and a new concept of integrating solar photocatalytic ozonation with catalytic ozonation in one plant for continuous treatment of wastewater regardless of sunlight availability is proposed. The story starts from our finding that bulk/nanosheet/nanoporous g-C 3 N 4 triggers a strong synergy between visible light (vis) and ozone, causing efficient mineralization of a wide vari...