复合光催化剂TiO₂/g-C₃N₄的光催化性能的研究

Study on Photocatalytic Performance of Composites Photocatalyst TiO₂/g-C₃N₄

摘要: TiO₂负载于类石墨相氮化碳(g-C₃N₄)中形成复合光催化剂的制备、表征及可见光条件下对水溶液中有机污染物降解性能。利用机械混合法制备出TiO₂/g-C₃N₄纳米复合光催化剂。对所制备的TiO₂/g-C₃N₄复合光催化剂进行详细的表征，利用染料RhB和作为目标降解物来对其光催化性能进行测评。制备的复合光催化剂在可见光激发下相比于单一的g-C₃N₄和单一的TiO₂性能有很大的提高。TiO₂/g-C₃N₄复合光催化剂光催化性能的提高可以归结于TiO₂和g-C₃N₄两种半导体的协同作用和光生载流子的有效分离，使得TiO₂半导体光催化剂的应用前景大大提高。TiO₂与g-C₃N₄的协同作用提高了光催化活性，TiO₂/g-C₃N₄复合光催化剂可以循环使用3次，且降解率只有略微的下降，这个发现极大地拓宽了TiO₂/g-C₃N₄复合光催化剂的应用范围。

Abstract: TiO₂ is loaded with the preparation, characterization and visible light conditions of the composite photocatalyst in the graphite phase nitride carbon (g-C₃N₄) for the degradation of organic pollutants in aqueous solution. The TiO₂/g-C₃N₄ nanocomposite photocatalyst was prepared by mechanical mixing. The preparation of the TiO₂/g-C₃N₄ composite photocatalyst was detailed, and the photocatalytic performance was assessed using the dye RhB and the target degradation material. The composite photocatalyst was enhanced by the visible light compared to the single g-C₃N₄ and single TiO₂ performance. The improvement of photocatalytic performance of TiO₂/g-C₃N₄ composite photocatalyst can be attributed to the synergistic effect of TiO₂ and g-C₃N₄ semiconductors and the effective separation of photo generated carriers, which greatly improves the application prospect of TiO₂ semiconductor photocatalyst. TiO₂ and g-C₃N₄ synergy to improve the photocatalytic activity of TiO₂/g-C₃N₄ composite photocatalyst can be recycled three times, and the degradation rate is only slightly reduced. This discovery greatly expanded the application of the TiO₂/g-C₃N₄ composite light catalyst.