Ag/AgBr/Bi_4Ti_3O_(12)催化剂的制备及可见光催化降解卡马西平
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摘要
首先利用水热法制备了Bi_4Ti_3O_(12)纳米片,再通过原位沉积和光还原的方法制备了Ag/Ag Br/Bi_4Ti_3O_(12)纳米片复合光催化剂.利用扫描电子显微镜(SEM)、透射电子显微镜(TEM)、X射线衍射仪(XRD)、紫外可见漫反射谱(DRS)及X射线光电子能谱仪(XPS)对其结构进行表征,以卡马西平(CBZ)作为目标污染物对其光催化活性进行评价.结果表明:Bi_4Ti_3O_(12)纳米片的厚度小于50 nm,长度小于500 nm.Ag/Ag Br的颗粒度小于20 nm.Ag/Ag Br的复合极大地提高了催化剂对卡马西平的光催化降解效率,光催化活性的提高主要是由于Ag/Ag Br可以显著抑制光生电子和空穴的复合.催化机理研究发现光生h~+在CBZ的光催化降解过程中起主要作用.
Bi_4Ti_3O_(12)nanosheets were firstly prepared by hydrothermal method and then the Ag/Ag Br/Bi_4Ti_3O_(12)nanosheet composite photocatalysts were obtained through the precipitation process combined with photoreduction method.Its structure was investigated by SEM,TEM,XRD,DRS.The photocatalytic activity was evaluated by degradation of carbamazepine(CBZ).The results showed that the thickness of the Bi_4Ti_3O_(12)nanosheets is less than 50 nm with the length less than 500 nm.The particle size of the Ag/Ag Br nanoparticles is less than 20 nm.The visible light induced photocatalytic efficiency for CBZ degradation was greatly enhanced,which may be due to the obviously inhibition of the photo-generated electron and hole due to the combination of Ag/Ag Br nanoparticles.The photo-generated h~+was found to be the mainly active species in the CBZ photocatalytic reaction.
Bi_4Ti_3O_(12)nanosheets were firstly prepared by hydrothermal method and then the Ag/Ag Br/Bi_4Ti_3O_(12)nanosheet composite photocatalysts were obtained through the precipitation process combined with photoreduction method.Its structure was investigated by SEM,TEM,XRD,DRS.The photocatalytic activity was evaluated by degradation of carbamazepine(CBZ).The results showed that the thickness of the Bi_4Ti_3O_(12)nanosheets is less than 50 nm with the length less than 500 nm.The particle size of the Ag/Ag Br nanoparticles is less than 20 nm.The visible light induced photocatalytic efficiency for CBZ degradation was greatly enhanced,which may be due to the obviously inhibition of the photo-generated electron and hole due to the combination of Ag/Ag Br nanoparticles.The photo-generated h~+was found to be the mainly active species in the CBZ photocatalytic reaction.
引文
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[3]DUAN Y,DENG L,SHI Z,et al. Assembly of graphene on Ag3PO4/Ag I for effective degradation of carbamazepine under Visible-light irradiation:Mechanism and degradation pathways[J]. Chemical Engineering Journal,2019,359:1379-1390.
[4]YANG L,LIANG L,WANG L,et al. Accelerated photocatalytic oxidation of carbamazepine by a novel 3D hierarchical protonated g-C3N4/Bi OBr heterojunction:Performance and mechanism[J]. Applied Surface Science,2019,473:527-539.
[5]程洋,牛和林.CdS纳米材料的合成及其光催化性质的研究[J].安徽大学学报(自然科学版),2018,42(2):79-87.CHENG Yang,NIU Helin.Synthesis and photocatalytic property of Cd S nanostructures[J].Journal of Anhui University(Natural Science Edition),2018,42(2):79-87.
[6]尹明彩,吴朝军,郑鹏飞,等.复合催化剂Ni S/g-C3N4的制备及光催化产氢性能[J].郑州大学学报(理学版),2017,49(1):85-91.YIN Mingcai,WU Chaojun,ZHENG Pengfei,et al.The preparation and photocatalytic hydrogen production of composite catalyst Ni S/g-C3N4[J].Journal of Zhengzhou University(Natural Science Edition),2017,49(1):85-91.
[7]CARABIN A,DROGUI P,ROBERT D. Photo-degradation of carbamazepine using Ti O2suspended photocatalysts[J]. Journal of the Taiwan Institute of Chemical Engineers,2015,54:109-117.
[8]MERIBOUT R,ZUO Y,KHODJA A,et al. photocatalytic degradation of antiepileptic drug carbamazepine with Bismuth oxychlorides(Bi OCl and Bi OCl/Ag Cl composite)in water:Efficiency evaluation and elucidation degradation pathways[J]. Journal of Photochemistry and Photobiology A:Chemistry,2016,328:105-113.
[9]DING Y,ZHANG G,WANG X,et al. Chemical and photocatalytic oxidative degradation of carbamazepine by using metastable Bi3+self-doped Na Bi O3nanosheets as a bifunctional material[J]. Applied Catalysis B:Environmental,2017,202:528-538.
[10]SHI H,TAN H,ZHU W,et al. Electrospun Cr-doped Bi4Ti3O12/Bi2Ti2O7heterostructure fibers with enhanced visible-light photocatalytic properties[J]. Journal of Materials Chemistry A,2015,3(12):6586-6591.
[11]LIU Y,ZHU G,GAO J,et al. A novel Ce O2/Bi4Ti3O12composite heterojunction structure with an enhanced photocatalytic activity for bisphenol A[J]. Journal of Alloys and Compounds,2016,688:487-496.
[12]GUO Y,LI J,GAO Z,et al. A simple and effective method for fabricating novel p-n heterojunction photocatalyst g-C3N4/Bi4Ti3O12and its photocatalytic performances[J].Applied Catalysis B:Environmental,2016,192:57-71.
[13]WANG P. Ag-AgBr/Ti O2/RGO nanocomposite:Synthesis,characterization,photocatalytic activity and aggregation evaluation[J]. Journal of Environmental Sciences,2017,56:202-213.
[14]ZHU Y,ZHU R,YAN L,et al. Visible-light Ag/Ag Br/ferrihydrite catalyst with enhanced heterogeneous photo-Fenton reactivity via electron transfer from Ag/Ag Br to ferrihydrite[J].Applied Catalysis B:Environmental,2018,239:280-289.
[15]LIU Y,ZHANG M,LI L,et al. One-dimensional visible-light-driven bifunctional photocatalysts based on Bi4Ti3O12nanofiber frameworks and Bi2XO6(X=Mo,W)nanosheets[J].Applied Catalysis B:Environmental,2014,160:757-766.
[16]LIU Y,ZHU G,GAO J,et al. Enhanced photocatalytic activity of Bi4Ti3O12nanosheets by Fe3+-doping and the addition of Au nanoparticles:Photodegradation of phenol and bisphenol A[J].Applied Catalysis B:Environmental,2017,200:72-82.
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