La_2O_3-TiO_2的制备及其光催化性能
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摘要
采用溶胶-凝胶法制备了La2O3-Ti O2光催化剂;运用XRD,UV-Vis DRS,BET技术对光催化剂进行了表征;并以太阳光为光源,研究了不同制备条件及光反应条件下La2O3-Ti O2对罗丹明B的降解效果。实验结果表明:最佳制备条件为镧掺杂量(硝酸镧与钛酸丁酯的质量比)0.9%、焙烧温度500℃、焙烧时间2 h;该条件下制备的光催化剂为中孔结构(平均孔径3.867 nm),禁带宽度小(2.07 e V),Ti O2为锐钛矿相;在光催化剂投加量为2 g/L、溶液p H为3的最佳光反应条件下反应4 h,La2O3-Ti O2对罗丹明B的降解率达99.7%,远高于N-Ti O2的42.0%;重复使用5次的La2O3-Ti O2光催化剂仍对罗丹明B保持较高的降解率(98.5%)。
The La2O3-doped Ti O2(La2O3-Ti O2) photocatalyst was prepared by sol-gel method and characterized by XRD,UV-Vis DRS and BET. The degradation effects of rhodamine B on La2O3-Ti O2 with sunlight under different preparation conditions and degradation conditions were studied. The experimental results show that:Under the optimum preparation conditions of lanthanum doping amount(the mass ratio of lanthanum nitrate to titanium n-butoxide)0.9%,calcination temperature 500 ℃ and calcination time 2 h,the prepared photocatalyst has mesoporous structure(with 3.867 nm of average pore size) and small band gap(2.07 e V),and Ti O2 in it is anatase;Under the optimum degradation conditions of photocatalyst dosage 2 g/L,solution p H 3and reaction time 4 h,the degradation rate of rhodamine B on La2O3-Ti O2 is 99.7%,which is much higher than 42.0% on N-Ti O2; The La2O3-Ti O2 photocatalyst after used for 5 times remains high degradation rate of rhodamine B(98.5%).
The La2O3-doped Ti O2(La2O3-Ti O2) photocatalyst was prepared by sol-gel method and characterized by XRD,UV-Vis DRS and BET. The degradation effects of rhodamine B on La2O3-Ti O2 with sunlight under different preparation conditions and degradation conditions were studied. The experimental results show that:Under the optimum preparation conditions of lanthanum doping amount(the mass ratio of lanthanum nitrate to titanium n-butoxide)0.9%,calcination temperature 500 ℃ and calcination time 2 h,the prepared photocatalyst has mesoporous structure(with 3.867 nm of average pore size) and small band gap(2.07 e V),and Ti O2 in it is anatase;Under the optimum degradation conditions of photocatalyst dosage 2 g/L,solution p H 3and reaction time 4 h,the degradation rate of rhodamine B on La2O3-Ti O2 is 99.7%,which is much higher than 42.0% on N-Ti O2; The La2O3-Ti O2 photocatalyst after used for 5 times remains high degradation rate of rhodamine B(98.5%).
引文
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[2]陈垚翰,沈俊,张昭.Si掺杂介孔SO42–/Ti O2的非模板剂法合成及表征[J].催化学报,2008,29(4):356-360.
[3]童海霞,陈启元,胡慧萍,等.Ti O2光催化活性向可见光区拓展的研究进展[J].功能材料,2005,36(9):1307-1311,1315.
[4]胡裕龙,刘宏芳,郭兴蓬.氮掺杂二氧化钛光催化剂的研究进展[J].硅酸盐学报,2010,38(3):535-541.
[5]李青霞,孙振亚,王婷.掺铁二氧化钛薄膜的自组装制备、表征与光催化性能研究[J].矿物学报,2011,31(1):102-107.
[6]Xu Anwu,Gao Yuan,Liu Hanqin.The Preparation,Characterization,and Their Photocatalytic Activities of Rare-Earth-Doped Ti O2 Nanoparticles[J].J Catal,2002,207(2):151-157.
[7]Jiao Yanchao,Zhu Mingfeng,Chen Feng,et al.LaDoped Titania Nanocrystals with Superior Photocatalytic Activity Prepared by Hydrothermal Method[J].Chin J Catal,2013,34(3):585-592.
[8]唐玉朝,李薇,胡春,等.Ti O2形态结构与光催化活性关系的研究[J].化学进展,2003,15(5):379-384.
[9]Lopez T,Gomez R,Sanchez E,et al.Photocatalytic Activity in the 2,4-Dinitroaniline Decomposition over Ti O2 Sol-Gel Derived Catalysts[J].J Sol-Gel Sci Technol,2001,22(1/2):99-107.
[10]刘广军,赵广旺,高洪涛.氮掺杂纳米二氧化钛的制备及其光催化性能[J].山东化工,2009,38(8):16-18,29.
[11]Yu Jiaguo,Yu Huogen,Cheng Bei,et al.Enhanced Photocatalytic Activity of Ti O2 Powder(P25)by Hydrothermal Treatment[J].J Mol Catal A:Chem,2006,253(1/2):112-118.
[12]秦好丽.氮掺杂二氧化钛的制备及可见光下对有机物的降解研究[D].广州:华南理工大学化学科学学院,2006.
[13]岳林海,水淼,徐铸德,等.稀土掺杂二氧化钛的相变和光催化活性[J].浙江大学学报:理学版,2000,27(1):69-74.
[14]李慧泉,李越湘,周新木,等.La2O3掺杂Ti O2光催化剂的制备和性能[J].分子催化,2004,18(4):304-309.
[15]薛寒松,李华基,胡慧芳,等.镧掺杂二氧化钛纳米管光催化性能[J].中国稀土学报,2008,26(1):18-23.
[16]唐剑文.镧掺杂纳米二氧化钛的可见光光催化性能研究[J].应用化工,2009,38(7):1013-1016.
[17]胡春,王怡中,汤鸿霄.多相光催化氧化的理论与实践发展[J].环境科学进展,1995,3(1):55-64.
[18]陈东丹,胡晓力,胡晓洪,等.稀土La2O3掺杂对Ti O2的光催化性能的影响[J].中国陶瓷,2003,39(1):1-3.
[19]柴瑜超,林琳,赵斌,等.稀土掺杂二氧化钛光催化剂的研究进展[J].材料导报,2013,27(1):38-43,65.