ZnO/BiOCl复合材料的制备及其可见光催化性能研究
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摘要
为提高BiOCl在可见光下的光催化性能,通过水解法合成了一系列复合ZnO的BiOCl样品,采用X射线粉末衍射仪、扫描电镜和紫外-可见分光光度仪对制得的催化剂的形貌、结构、物相组成以及光学性能进行了表征,通过降解罗丹明B对样品的光催化性能进行研究。结果表明,复合ZnO后可有效提高BiOCl的光催化活性,其中1Zn/20Bi的光催化活性最高,115 min内可见光降解罗丹明B的降解率达99%。通过研究机理发现,ZnO纳米异质结构不仅负责较高的可见光光催化活性,它在分离光产生的空穴和电子也起着至关重要的作用。
In order to improve the photocatalytic performance of BiOCl under visible light,a series of BiOCl samples with ZnO were synthesized by hydrolysis method.The morphology,structure,phase composition and optical properties of the prepared catalysts were characterized by XRD,SEM,UV-Vis diffuse reflectance spectroscopy and PL spectra.The photocatalytic properties of the samples were investigated by degrading Rhodamine B.The results show that the photocatalytic activity of BiOCl can be effectively improved by composite ZnO.The photocatalytic activity of 1 Zn/20 Bi is the highest,which the degradation rate of Rhodamine B in 115 min reach 99% under visible light.By studying the research mechanism,it is concluded that the ZnO nano-heterostructure is not only responsible for the high visible light photocatalytic activity,but also plays a vital role in separating the holes and electrons generated by light.
In order to improve the photocatalytic performance of BiOCl under visible light,a series of BiOCl samples with ZnO were synthesized by hydrolysis method.The morphology,structure,phase composition and optical properties of the prepared catalysts were characterized by XRD,SEM,UV-Vis diffuse reflectance spectroscopy and PL spectra.The photocatalytic properties of the samples were investigated by degrading Rhodamine B.The results show that the photocatalytic activity of BiOCl can be effectively improved by composite ZnO.The photocatalytic activity of 1 Zn/20 Bi is the highest,which the degradation rate of Rhodamine B in 115 min reach 99% under visible light.By studying the research mechanism,it is concluded that the ZnO nano-heterostructure is not only responsible for the high visible light photocatalytic activity,but also plays a vital role in separating the holes and electrons generated by light.
引文
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[3] 方黎,韩选利,李斌强.改性纳米氧化锌光催化降解水体甲醛的研究[J].应用化工,2013,42(5):894-896.
[4] 魏平玉,杨青林,郭林.卤氧化铋化合物光催化剂[J].化学进展,2009,21(9):1734-1741.
[5] Ganose A M,Cuff M,Butler K T,et al.Interplay of orbital and relativistic effects in bismuth oxyhalides:BiOF,BiOCl,BiOBr,and BiOI[J].Chemistry of Materials,2016,28(7):1980-1984.
[6] Wu S,Xiong J,Sun J,et al.Hydroxyl-dependent evolution of oxygen vacancies enables the regeneration of BiOCl photocatalyst[J].Acs Applied Materials & Interfaces,2017,9(19):16620-16626.
[7] Zheng Y,Zhang X,Zhao J,et al.Assembled fabrication of α-Fe2O3/BiOCl heterojunctions with enhanced photocatalytic performance[J].Applied Surface Science,2017,430:585-594.
[8] 赵真.稀土掺杂氧化锌粉末的制备及光学/光催化性能的研究[D].长春:吉林大学,2014.
[9] 来佑磊.不同形貌的纳米ZnO材料的控制合成及其光催化性能的研究[D].天津:天津大学,2011.
[10] 熊莉.ZnO基纳米复合材料的制备及其光催化性能的研究[D].南京:南京邮电大学,2013.
[11] Lu H,Xu L,Wei B,et al.Enhanced photosensitization process induced by the p-n,junction of Bi2O2CO3/BiOCl heterojunctions on the degradation of Rhodamine B[J].Applied Surface Science,2014,303(5):360-366.
[12] Li F B,Li X Z.Photocatalytic properties of gold/gold ion-modified titanium dioxide for wastewater treatment[J].Applied Catalysis A General,2002,228(1):15-27.
[13] Fu J,Tian Y,Chang B,et al.BiOBr-carbon nitride heterojunctions:synthesis,enhanced activity and photocatalytic mechanism[J].Journal of Materials Chemistry,2012,22(39):21159-21166.