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复合光催化剂TiO2/g-C3N4的光催化性能的研究
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Abstract:
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。
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.
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