铈掺杂氧化锌六角杯型结构纳米光催化剂的制备及其性能研究
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摘要
通过微波辅助水热技术制备了新颖的六角杯型铈掺杂氧化锌(Ce/ZnO)纳米光催化材料.利用XRD,SEM,XPS,UV-Vis DRS等手段表征了上述材料的结构、形貌及光学特性.讨论了Ce/ZnO六角杯型结构可能的生长机理.实验结果表明:光催化降解罗丹明B(RhB)的反应中,稀土Ce掺杂可以拓宽ZnO的光吸收范围,并进一步提高其光催化活性;不同的Ce掺杂浓度对Ce/ZnO光催化性能的影响存在一定的差异;Ce/ZnO在模拟太阳光激发下,经循环使用6次之后RhB的催化降解效率仍非常可观.该样品性能的提高得益于二元异质复合材料高效的光生电子和空穴的分离能力.
Cerium-doped ZnO(Ce/ZnO) hexagonally cup-like photocatalysts were prepared by a microwave-assisted hydrothermal approach. The physicochemical properties of the Ce/ZnO materials were characterized by XRD, SEM, XPS and UV-Vis DRS and so on. The growth mechanism of the cup-like Ce/ZnO product was discussed in detail. The experimental results demonstrated that cerium doping could broaden the light absorption range of ZnO and further improve its photocatalytic activity in the photocatalytic degradation of rhodamine B(RhB). The different cerium doping concentration on the photocatalytic performance of Ce/ZnO were also different. The photodegradation efficiency of RhB of Ce/ZnO under simulated sunlight excitation was still very impressive after 6 cycles. The enhancement mainly attributed to the best separation efficiency of the photogenerated electrons-holes.
Cerium-doped ZnO(Ce/ZnO) hexagonally cup-like photocatalysts were prepared by a microwave-assisted hydrothermal approach. The physicochemical properties of the Ce/ZnO materials were characterized by XRD, SEM, XPS and UV-Vis DRS and so on. The growth mechanism of the cup-like Ce/ZnO product was discussed in detail. The experimental results demonstrated that cerium doping could broaden the light absorption range of ZnO and further improve its photocatalytic activity in the photocatalytic degradation of rhodamine B(RhB). The different cerium doping concentration on the photocatalytic performance of Ce/ZnO were also different. The photodegradation efficiency of RhB of Ce/ZnO under simulated sunlight excitation was still very impressive after 6 cycles. The enhancement mainly attributed to the best separation efficiency of the photogenerated electrons-holes.
引文
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[2]KANSAL S K,SINGH M,SUD D.Studies on TiO2/ZnO photocatalysed degradation of lignin[J].J Hazard Mater,2008,153(1/2):412-417.
[3]MURUGANANDHAM M,CHEN I S,WU J J.Effect of temperature on the formation of macroporous ZnO bundles and its application in photocatalysis[J].J Hazard Mater,2009,172(2/3):700-706.
[4]BOPPELLA R,ANJANEYULU K,BASAK P,et al.Facile synthesis of face oriented ZnO crystals:Tunable polar facets and shape induced enhanced photocatalytic performance[J].J Phys Chem C,2013,117(9):4597-4605.
[5]HE W,KIM H K,WAMER W G,et al.Photogenerated charge carriers and reactive oxygen species in ZnO/Au hybrid nanostructures with enhanced photocatalytic and antibacterial activity[J].J Am Chem Soc,2014,136(2):750-757.
[6]WU W,ZHANG S,XIAO X,et al.Controllable synthesis,magnetic properties,and enhanced photocatalytic activity of spindlelike mesoporous alpha-Fe2O3/ZnO core-shell heterostructures[J].ACS Appl Mater Interfaces,2012,4(7):3602-3609.
[7]ETACHERI V,ROSHAN R,KUMARV.Mg-doped ZnO nanoparticles for efficient sunlight-driven photocatalysis[J].ACS Appl Mater Interfaces,2012,4(5):2717-2725.
[8]BESSEKHOUAD Y,ROBERT D,WEBER J V.Photocatalytic activity of Cu2O/TiO2,Bi2O3/TiO2 and ZnMn2O4/TiO2 heterojunctions[J].Catalysis Today,2005,101(3/4):315-321.
[9]张彤,张悦炜,张世著,等.可见光响应型窄带隙半导体光催化材料的研究及应用进展[J].材料导报,2009,23(3):24-28.
[10]王海生.多孔金属氧化物半导体材料的构建与性能的研究[D].合肥:安徽大学,2013.
[11]RANJIT K T,WILLNER I,BOSSMANN S L,et al.Lanthanide oxide doped titanium dioxide photocatalysts:Effective photocatalysts for the enhanced degradation of salicylic acid and t-cinnamic acid[J].J Catal,2001,204(2):305-310.
[12]JIANG J,ZHANG K,CHEN X,et al.Porous Ce-doped ZnO hollow sphere with enhanced photodegradation activity for artificial waste water[J].J Alloy Compd,2017,699:907-913.
[13]HE R,HOCKING R K,TSUZUKI T.Co-doped ZnO nanopowders:Location of cobalt and reduction in photocatalytic activity[J].Mater Chem Phys,2012,132(2/3):1035-1040.
[14]LU Y,LIN Y,XIE T,et al.Enhancement of visible-light-driven photoresponse of Mn/ZnO system:Photogenerated charge transfer properties and photocatalytic activity[J].Nanoscale,2012,4(20):6393-6400.
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