可见光响应型球形Zn/BiOBr的制备及其光催化性能研究
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摘要
采用溶剂热法制备Zn~(2+)掺杂的溴氧化铋(BiOBr)(Zn/BiOBr)光催化剂,通过X射线衍射仪、扫描电子显微镜、比表面积孔径分析仪对其结构形貌进行分析表征,并考察了其对罗丹明B(RhB)的光催化活性。结果表明,Zn~(2+)掺杂量不同的Zn/BiOBr均为四方晶型,掺入Zn~(2+)后Zn/BiOBr样品的禁带宽度缩小、比表面积增大,光催化活性均明显提高,且10%Zn/BiOBr光催化活性最高;用蓝色LED光照射120min,其对RhB溶液的光降解率达到96%,比纯BiOBr的降解效率提高16%。循环使用3次后,Zn/BiOBr降解率仍达到85%,光催化过程中h+和·O_2-是主要的活性物质。
Zn~(2+)doped BiOBr(Zn/BiOBr)photocatalysts were prepared by solvothermal method,the structural and the photocatalytic performances of products were characterized by SEM,XRD,DRS,BET and the photodegradation of rhodamine B(RhB).Experimental results showed that Zn/BiOBr were tetragonal phase,Zn/BiOBr samples had lower band gaps and higher specific surface area,which contributed to the higher photocatalytic performance.What is more,10% Zn/BiOBr samples revealed the most efficient for degradating RhB and the degradation rate were 96% within 120 min under blue LED,which increased by 16%than that of pure BiOBr.After cycling for three times,the degradation rate of RhB maintained 85%.The results also suggested that h+and·O_2-were the main reactive species in the photocatalytic process for Rh B degradation.
Zn~(2+)doped BiOBr(Zn/BiOBr)photocatalysts were prepared by solvothermal method,the structural and the photocatalytic performances of products were characterized by SEM,XRD,DRS,BET and the photodegradation of rhodamine B(RhB).Experimental results showed that Zn/BiOBr were tetragonal phase,Zn/BiOBr samples had lower band gaps and higher specific surface area,which contributed to the higher photocatalytic performance.What is more,10% Zn/BiOBr samples revealed the most efficient for degradating RhB and the degradation rate were 96% within 120 min under blue LED,which increased by 16%than that of pure BiOBr.After cycling for three times,the degradation rate of RhB maintained 85%.The results also suggested that h+and·O_2-were the main reactive species in the photocatalytic process for Rh B degradation.
引文
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[4]Huo Y,Zhang J,Miao M,et al.Solvothermal synthesis of flower-like BiOBr microspheres with highly visible-light photocatalytic performances[J].Applied Catalysis B:Environmental,2012,111-112:334-341.
[5]Cheng H,Huang B,Dai Y.Engineering BiOX(X=Cl,Br,I)nanostructures for highly efficient photocatalytic applications[J].Nanoscale,2014,6(4):2009-2026.
[6]Jiang J,Zhao K,Xiao X,et al.Synthesis and facet-dependent photoreactivity of BiOCl single-crystalline nanosheets[J].Journal of the American Chemical Society,2012,134(10):4473-4476.
[7]Xu J,Li L,Guo C,et al.Removal of benzotriazole from solution by BiOBr photocatalysis under simulated solar irradiation[J].Chemical Engineering Journal,2013,221(4):230-237.
[8]Natarajan K,Bajaj H C,Tayade R J.Photocatalytic efficiency of bismuth oxyhalide(Br,Cl and I)nanoplates for RhB dye degradation under LED irradiation[J].Journal of Industrial and Engineering Chemistry,2016,34(25):146-156.
[9]陈振,杨阳.复合材料BiOBrxCl1-x的制备及可见光催化降解罗丹明B[J].材料导报,2016,30(S2):492-494;530.
[10]Geng Y,Li N,Ma J,et al.Preparation,characterization and photocatalytic properties of BiOBr/ZnO composites[J].Journal of Energy Chemistry,2017(3):416-421.
[11]Jiang G,Wang X,Wei Z,et al.Photocatalytic properties of hierarchical structures based on Fe-doped BiOBr hollow microspheres[J].Journal of Materials Chemistry A,2013,1(7):2406-2410.
[12]周薇,胡晓龙,赵小蓉,等.石墨烯-溴氧化铋复合物的制备及可见光光催化性能研究[J].分子催化,2014,28(4):367-375.
[13]Jiang G,Wang R,Wang X,et al.Novel highly active visiblelight-induced photocatalysts based on BiOBr with Ti doping and Ag decorating[J].ACS Applied Materials &Interfaces,2012,4(9):4440-4444.
[14]Kanagaraj T,Thiripuranthagan S.Photocatalytic activities of novel SrTiO3-BiOBr heterojunction catalysts towards the degradation of reactive dyes[J].Applied Catalysis B Environmental,2017,207:218-232.
[15]Liu Z S,Wu B T,Zhao Y L,et al.Solvothermal synthesis and photocatalytic activity of Al-doped BiOBr microspheres[J].Ceramics International,2014,40(4):5597-5603.
[16]Malengreaux C M,Pirard S L,Bartlett J R,et al.Kinetic study of 4-nitrophenol photocatalytic degradation over a Zn2+doped TiO2catalyst prepared through an environmentally friendly aqueous sol-gel process[J].Chemical Engineering Journal,2014,245:180-190.
[17]Li Y,Wang Z,Huang B,et al.Synthesis of BiOBr-PVP hybrids with enhanced adsorption-photocatalytic properties[J].Applied Surface Science,2015,347:258-264.
[18]周海芳,王谢春,郑巧,等.Na+掺杂KLaF4∶Er3+/Yb3+纳米晶上转换发光性能的研究[J].人工晶体学报,2016,45(4):886-891.
[19]Yuan M,Tian F,Li G,et al.Fe(Ⅲ)-modified BiOBr hierarchitectures for improved photocatalytic benzyl alcohol oxidation and organic pollutants degradation[J].Industrial &Engineering Chemistry Research,2017,56(20):5935-5943.
[20]Belver C,Bedia J,Alvarez-Montero M A,et al.Solar photocatalytic purification of water with Ce-doped TiO2/clay heterostructures[J].Catalysis Today,2016,266:36-45.