MWCNT/Bi_2WO_6复合光催化剂的制备及其活性研究
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摘要
采用水热合成法将多壁碳纳米管(MWCNT)和Bi_2WO_6有效复合,制备了具有高效光催化活性的MWCNT/Bi_2WO_6催化剂。利用XRD、SEM、TEM、XPS、BET和UV-Vis等技术对样品进行表征分析,以罗丹明B为目标污染物,考察了催化剂的光催化性能。结果表明,合成的样品均为斜方晶体结构,MWCNT交互附着在Bi_2WO_6片层结构的周围,两者紧密接触形成了复合物。合成的MWCNT/Bi_2WO_6样品具有较大的比表面积和较小的禁带宽度,能有效抑制光生电子和空穴的复合,增加了量子的传递效率,更容易被光照激发。当MWCNT负载量为2%(质量分数)时,催化剂表现出了最佳的催化性能,在模拟太阳光试验中,该催化剂对10 mg/L的罗丹明B溶液光降解效率高达98. 8%。
The MWCNT/Bi_2 WO_6 composite photocatalysts with high photocatalytic activity were successfully synthesized from multiwalled carbon nanotubes and Bi_2 WO_6 via hydrothermal method. The structures and morphology of the samples were characterized by XRD,SEM,TEM,XPS,BET and UV-Vis. The photocatalytic performance of the catalyst was investigated by taking Rhodamine B as the target pollutant. The results indicated that the obtained composite presented orthorhombic crystal structure,the MWCNTs alternately attached to the lamella structure of Bi_2 WO_6 to form the composite. The synthesized MWCNT/Bi_2 WO_6 possessed large specific surface area and narrow band gap,which could effectively inhibit the recombination of photogenerated electrons and holes,increase the quantum transfer efficiency and was more likely to be excited by light.The MWCNT/Bi_2 WO_6 photocatalysts exhibited the best catalytic performance with the loading amount of 2%. Under the simulated sunlight test,the photodegradation efficiency of MWCNT/Bi_2 WO_6 to 10 mg/L Rhodamine B could reach as high as 98. 8%.
The MWCNT/Bi_2 WO_6 composite photocatalysts with high photocatalytic activity were successfully synthesized from multiwalled carbon nanotubes and Bi_2 WO_6 via hydrothermal method. The structures and morphology of the samples were characterized by XRD,SEM,TEM,XPS,BET and UV-Vis. The photocatalytic performance of the catalyst was investigated by taking Rhodamine B as the target pollutant. The results indicated that the obtained composite presented orthorhombic crystal structure,the MWCNTs alternately attached to the lamella structure of Bi_2 WO_6 to form the composite. The synthesized MWCNT/Bi_2 WO_6 possessed large specific surface area and narrow band gap,which could effectively inhibit the recombination of photogenerated electrons and holes,increase the quantum transfer efficiency and was more likely to be excited by light.The MWCNT/Bi_2 WO_6 photocatalysts exhibited the best catalytic performance with the loading amount of 2%. Under the simulated sunlight test,the photodegradation efficiency of MWCNT/Bi_2 WO_6 to 10 mg/L Rhodamine B could reach as high as 98. 8%.
引文
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