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以PW11Cu为可见光活性组分,Ti O2为载体结构组分,采用溶胶-凝胶法制备了PW11Cu/Ti O2复合膜可见光催化剂,并用UV-Vis DRS、IR、Raman、XRD、SEM、TEM等手段对催化剂的光吸收性质、化学组成、晶相、表面结构和形貌进行了表征,同时,以模型污染物Rh B的可见光降解为探针评估了它的光催化活性,考察了膜处理温度、PW11Cu含量和溶液酸性对催化活性的影响,最后,通过催化剂循环降解Rh B试验评估了PW11Cu/Ti O2膜的稳定性。实验结果表明,PW11Cu/Ti O2膜对可见光有明显吸收,低温(100℃)处理的膜为无定形态,高温(500℃)处理的膜为多晶态;低温处理的膜具有较高的可见光催化活性,用于Rh B的可见光催化降解,在中性条件下反应80 min,Rh B的降解率为100%,TOC去除达32%(4 h);提高溶液酸性有利于催化剂活性的提高,在p H=2.5的条件下,达到100%的Rh B降解仅需30 min。在本实验条件下,PW11Cu的最佳剂量是3.0 g。经过10次循环降解Rh B,催化剂的光催化活性仍保留约90%。
PW11Cu as a visible light active component and Ti O2 as a carrier structural component, a PW11Cu / Ti O2 composite film visible light photocatalyst was prepared by a sol-gel method. The UV-Vis DRS, IR, Raman, XRD, SEM and TEM methods The photoabsorption properties, chemical composition, crystal phase, surface structure and morphology of the catalyst were characterized. At the same time, the photocatalytic activity of the model pollutant Rh B was evaluated by visible light degradation. The effects of temperature, PW11Cu content and solution acidity on the catalytic activity. Finally, the stability of the PW11Cu / Ti O2 film was evaluated by cyclic degradation of the catalyst RhB. The experimental results show that PW11Cu / Ti O2 film has obvious absorption to visible light. The films treated at low temperature (100 ℃) are in amorphous state and the films treated at high temperature (500 ℃) are in polycrystalline state. The films treated with low temperature have high visible light The photocatalytic activity of RhB was evaluated by visible light irradiation. RhB degradation rate was 100% and TOC removal rate was 32% (4 h) after 80 min reaction under neutral condition. Increasing the acidity of the solution was beneficial to the improvement of catalyst activity, With p H = 2.5, Rh B degradation of 100% takes only 30 min. Under this experimental condition, the optimal dose of PW11Cu is 3.0 g. After 10 cycles of degradation of Rh B, the photocatalytic activity of the catalyst remained about 90%.