| PW11Cu/TiO2膜光催化剂的制备及可见光催化性能 | |
| PW11Cu/TiO2 Film Photocatalyst: Preparation and Visible Photocatalytic Performance | |
| 摘要: 以PW11Cu为可见光活性组分,TiO2为载体结构组分,采用溶胶-凝胶法制备了PW11Cu/TiO2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RhB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RhB试验评估了PW11Cu/TiO2膜的稳定性。实验结果表明,PW11Cu/TiO2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RhB的可见光催化降解,在中性条件下反应80 min,RhB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pH=2.5的条件下,达到100%的RhB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RhB,催化剂的光催化活性仍保留约90%。 | |
| 关键词: Keggin型铜取代杂多酸盐 二氧化钛 可见光催化剂 RhB降解 溶胶-凝胶法 | |
| 基金项目: 国家自然科学基金(No.21161007)、海南省国际科技合作重点项目(No.2012-GH004;KJHZ2014-08)和海南省应用技术研究与开发专项(No.ZDXM20130088;ZDXM2014099)、国家大学生创新训练项目(No.201411658027)资助。 | |
| Abstract: A PW11Cu/TiO2 composite film photocatalyst was prepared on the surface of a glass slide via the sol-gel dipping pulling method using tetrabutyl titanate Ti(OC4H9)4 as the precursor of TiO2 and the Keggin type copper substituted heteropolyanion PW11Cu as the visible light active component in this paper. Then the light absorption properties, the chemical composition, the crystal phase and the surface morphology of the as-prepared catalyst were characterized using UV-Vis DRS, IR, XRD, SEM and TEM. Meanwhile, the visible photocatalytic activity of the catalyst was assessed using the photocatalytic degradation of RhB, a model pollutant, as a probe. Influences of the calcination temperature,the PW11Cr dosage and the solution pH on the catalyst activity were also examined. In the end, a recycle test of the catalyst for RhB degradation was employed to evaluate the stability of the catalyst. Experimental results show that the PW11Cu/TiO2 photocatalyst has a good absorption to visible light. The film yielded at low calcination temperature (100℃) is amorphous and crystalline at high calcination temperature (500℃). The former has higher photocatalytic activity, and was employed to degrade RhB with a concentration of 10 μmol·L-1 under the irradiation of 200 W metal halide lamp, the degradation ratio was about 100% at 80 min and the TOC removal was 32% at 4 h. High solution acidity is favorable to enhancement of the photocatalytic activity of the PW11Cu/TiO2 film. Reaching 100% of RhB degradaion only needed 30 min at pH=2.5. The optimal PW11Cu dosage is 3.0 g under the experimental conditions. The photocatalytic activity of the PW11Cu/TiO2 film remains about 90% after 10 times recycles for RhB degradaion. | |
| Keywords: Keggin-type Cu-substituted heteropolyoxometallate TiO2 visible photocatalyst rhodamine B degradation the sol-gel method | |
| 投稿时间：2015-04-17 修订日期：2015-06-27 | |
| 摘要点击次数: 1232 | |
| 全文下载次数: 1977 | |
| 邹晓梅,陈启胜,柯小雪,雷琴,赵梓铭,刘希龙,陈艳,华英杰,王崇太.PW11Cu/TiO2膜光催化剂的制备及可见光催化性能[J].无机化学学报,2015,31(10):2037-2043. | |
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