采用溶胶-凝胶法制备 Ag/Bi-TiO2光催化剂,通过 XRD、SEM、BET 及 UV-Vis DRS 对催化剂进行表征,并对其可见光催化气相甲苯的活性进行了考察。结果表明,与纯TiO2相比,Ag/Bi-TiO2光催化剂的晶粒粒径减小,比表面积增大,同时Bi—O—Ti键以及Ag杂质能级的形成,拓宽了 TiO2的光吸收范围,减少了光生电子-空穴的复合几率,提高 TiO2的光催化活性。当焙烧温度为450℃时,0．001Ag/0．05Bi-TiO2光催化剂(n (Ag)/n (TiO2)＝0．001,n (Bi)/n(TiO2)＝0．05)对甲苯的降解效率能达到77．7％,比纯TiO2提高了72．6％。
Ag/Bi-TiO2 were prepared by sol-gel method and characterized by XRD,SEM,BET and UV-Vis DRS.Meanwhile,its photo-catalytic capacity of the prepared Ag/Bi-TiO2 catalysts was investigated by gas-phase toluene under visible light.The results show that the Ag/Bi-TiO2 catalysts exhibited smaller crystallite sizes,larger specific surface areas than pure TiO2 .Because of the formation of Bi—O—Ti band and Ag impurity level,the absorb range of solar light can be broaden,thus resulting in the enhanced visible light absorption per-formance of the Ag/Bi-TiO2 catalysts.In addition,the doped of Bi and Ag can reduce the recombination proba-bility of the electron-hole pairs,which was beneficial to enhance photo-catalytic activity of TiO2 .The maximum ratio of degradation of toluene can reach to 77.7% when the calcination temperature was 450 ℃ and the quantity of the doped Ag was mole fraction 0.1%,Bi was 5%,which was 72.6% higher than pure TiO2 .
参考文献
| [1] | Wei Zaishan;Sun Jianliang;Xie Zhirong et al.Removal of gaseous toluene by the combination of photocatalytic oxidation under complex light irradiation of UV and visi-ble light and biological process[J].Journal of Hazardous Materials,2010,177:814-821. |
| [2] | Meng Nan Chong;Bo Jin;Christopher W.K. Chow;Chris Saint .Recent developments in photocatalytic water treatment technology: A review[J].Water research: A journal of the international water association,2010(10):p.2997. |
| [3] | Hongxia Meng;Bingbing Wang;Song Liu .Hydrothermal preparation, characterization and photocatalytic activity of TiO_2/Fe-TiO_2 composite catalysts[J].CERAMICS INTERNATIONAL,2013(5):5785-5793. |
| [4] | Xinyong Li;Xuejun Zou;Zhenping Qu;Qidong Zhao;Lianzhou Wang .Photocatalytic degradation of gaseous toluene over Ag-doping TiO_2 nanotube powder prepared by anodization coupled with impregnation method[J].Chemosphere: Environmental toxicology and risk assessment,2011(5):674-679. |
| [5] | 段萍,罗玉萍,刘健梅,朱忠其,柳清菊.Co掺杂TiO2光催化剂的研究[J].功能材料,2014(12):12074-12078. |
| [6] | Sun Xinguo;Li Chunmei;Ruan Luying et al.Ce-doped SiO2 @TiO2 anocomposite as an effective visible light photocatalyst[J].Journal of Alloys and Compounds,2014,585:800-804. |
| [7] | Tina Harifi;Majid Montazer.Fe~(3+):Ag/TiO2 nanocomposite: Synthesis, characterization and photocatalytic activity under UV and visible light irradiation[J].Applied Catalysis, A. General: An International Journal Devoted to Catalytic Science and Its Applications,2014:104-115. |
| [8] | Kraiwit A N;Pongwan P;Inceesungvorn B et al.Photo-catalytic activities of Fe-Cu/TiO2 on the mineralization of oxalicacid and formic acid under visible light irradiation[J].Powder Technology,2014,266:447-455. |
| [9] | Lifen Liu;Fang Chen;Fenglin Yang.Photocatalytic degradation of 2,4-dichlorophenol using nanoscale Fe/TiO2[J].Chemical engineering journal,2012:189-195. |
| [10] | 张理元,刘钟馨,于晓龙,吕作凤,曹阳.Ag掺杂纳米二氧化钛的制备及光催化性能研究[J].功能材料,2010(12):2169-2173. |
| [11] | Harikishore M;Sandhyarani M;Venkateswarlu K et al.Effect of Ag doping on antibacterial and photocatalytic activity of nanocrystalline TiO2[J].Proce-dia Materials Science,2014,6:557-566. |
| [12] | 富好,罗秀针,袁霞,施俊新,高碧芬.Ce掺杂TiO2的制备及其可见光光催化性能[J].功能材料,2013(24):3566-3570. |
| [13] | Anna Zielinska-Jurek;Adriana Zaleska.Ag/Pt-modified TiO2 nanoparticles for toluene photooxidation in the gas phase[J].Catalysis Today,2014:104-111. |
| [14] | 董刚,朱忠其,柳清菊.镍掺杂TiO_2光催化剂的制备及光催化性能[J].功能材料,2012(03):294-298. |
| [15] | S.Rengaraj;X.Z.Li;P.A.Tanner;Z.F.Pan;G.K.H.Pang .Photocatalytic degradation of methylparathion-An endocrine disruptor by Bi~(3+)-doped TiO_2[J].Journal of molecular catalysis, A. Chemical,2006(1/2):36-43. |
| [16] | Yin Hu;Yuantao Cao;Peixian Wang.A new perspective for effect of Bi on the photocatalytic activity of Bi-doped TiO2[J].Applied Catalysis, B. Environmental: An International Journal Devoted to Catalytic Science and Its Applications,2012:294-303. |
| [17] | 周强,董守安,万婧.Ag/TiO2光催化剂研究：I.银粒子尺寸对光催化性能的影响[J].贵金属,2010(03):7-11,15. |
| [18] | Shunsuke Nishimoto;Atsushi Kubo;Xintong Zhang;Zhaoyue Liu;Noriaki Taneichi;Toshiki Okui;Taketoshi Murakami;Takashi Komine;Akira Fujishima .Novel Hydrophobic/hydrophilic Patterning Process By Photocatalytic Ag Nucleation On Tio_2 Thin Film And Electroless Cu Deposition[J].Applied Surface Science: A Journal Devoted to the Properties of Interfaces in Relation to the Synthesis and Behaviour of Materials,2008(18):5891-5894. |
| [19] | 杨昕宇,向卫东.掺杂Ag对TiO2粉末晶型结构的影响[J].硅酸盐通报,2007(03):478-481,493. |
| [20] | Moulder J F.Handbook of X-ray photoelectron spectros-copy[M].Eden Prairie:Perkin-Elmer Physical Electron-ics Division,1992:234. |
| [21] | Zuo Housong;Sun Jie;Deng Kejian et al.Preparation and characterization of Bi3+-TiO2 and its photocatalytic activity[J].Chemical Engineerning & Technology,2007,30(5):577-582. |
| [22] | Zhao Fang.Study on the synthesis,characterization and photocatalystic properties of Ag and N codoped suppor-ted titanium dioxide nanoparticles[M].Ningxia:Ningxia University,2013 |
| [23] | 方奕文,余林,叶飞,孙明.Ag改性TiO2催化剂的制备、表征及其甲苯气相光催化降解性能[J].分子催化,2011(06):569-573. |
| [24] | 罗妮,王宁,张昭.多孔Ag/TiO2的制备及其光催化性研究[J].功能材料,2007(07):1143-1145,1148. |
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