基于光-湿性能的Cu-Ce/TiO_2复合材料制备与表征
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摘要
以Cu(NO_3)_2·3H_2O和Ce(NO_3)_3·6H_2O为改性剂,采用溶胶-凝胶法制备Cu-Ce/TiO_2。利用XRD、LPSA、SEM、BET、UV-Vis和DVS对Cu-Ce/TiO_2的物质组成、粒度分布、微观形貌、孔结构和光学性能进行表征。结果表明,Cu-Ce/TiO_2具有大量锐钛矿型TiO_2,促使其吸收边带呈现明显的拓展与红移。Cu-Ce/TiO_2呈现较为规则的球状且结构致密,其粒径较大且局部出现团聚。Cu-Ce/TiO_2的比表面积为107.06m2/g、孔体积为0.1268~0.1354mL/g、平均孔直径为4.29~5.47nm,具有良好的孔结构。Cu-Ce/TiO_2在4h的甲醛降解效率为50.9%,在相对湿度35%~75%的平衡含湿量为0.0143~0.1005g/g,具有良好的光催化性能与吸放湿性能。
With Cu(NO_3)_2·3H_2O and Ce(NO_3)_3·6H_2O as modifiers,Cu-Ce/TiO_2 was prepared by sol-gel method.Composition,particle size distribution,microstructure,pore structure and optical property of Cu-Ce/TiO_2 were characterized by XRD,LPSA,SEM,BET,UV-Vis and DVS.Experimental results showed that Cu-Ce/TiO_2 contained a large number of anatase TiO_2,prompting obvious expansion and redshift of absorption sideband.Cu-Ce/TiO_2 presented more regular ball and dense structure,of which the size was larger and partial agglomeration came out.With good pore structure,Cu-Ce/TiO_2 had specific surface area of 107.06m~2·g~(-1),pore volume of 0.1268~0.1354mL·g~(-1),and average pore diameter of 4.29~5.47 nm.What's more,Cu-Ce/TiO_2 showed good photocatalytic performance and moisture performance,i.e.,formaldehyde degradation rate was 50.9% at 4h and equilibrium moisture content was 0.0143~0.1005g·g~(-1) from RH=35%to RH=75%.
With Cu(NO_3)_2·3H_2O and Ce(NO_3)_3·6H_2O as modifiers,Cu-Ce/TiO_2 was prepared by sol-gel method.Composition,particle size distribution,microstructure,pore structure and optical property of Cu-Ce/TiO_2 were characterized by XRD,LPSA,SEM,BET,UV-Vis and DVS.Experimental results showed that Cu-Ce/TiO_2 contained a large number of anatase TiO_2,prompting obvious expansion and redshift of absorption sideband.Cu-Ce/TiO_2 presented more regular ball and dense structure,of which the size was larger and partial agglomeration came out.With good pore structure,Cu-Ce/TiO_2 had specific surface area of 107.06m~2·g~(-1),pore volume of 0.1268~0.1354mL·g~(-1),and average pore diameter of 4.29~5.47 nm.What's more,Cu-Ce/TiO_2 showed good photocatalytic performance and moisture performance,i.e.,formaldehyde degradation rate was 50.9% at 4h and equilibrium moisture content was 0.0143~0.1005g·g~(-1) from RH=35%to RH=75%.
引文
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[2]Jing L Q,Xin B F,Yuan F L,et al.Effects of surface oxygen vacancies on photophysical and photochemical processes of Zndoped TiO2nanoparticles and their relationships[J].The Journal of Physical Chemistry B,2006,110(36):17860-17865.
[3]Zhao H M,Chen Y,Quan X,et al.Preparation of Zn-doped TiO2nanotubes electrode and its application in pentachlorophenol photoelectrocatalytic degradation[J].Chinese Science Bull,2007,52(11):1456-1461.
[4]Tojo S,Tachikawa T,Fujtsuka M,et al.Iodine-doped TiO2photocatalysts:correlation between band structure and mechanism[J].The Journal of Physical Chemistry C,2008,112(38):14948-14954.
[5]Zhao D,Peng T Y,Liu M,et al.Fabrication,characterization and photocatalytic activity of Gd3+-doped titania nanoparticles with mesostructure[J].Microporous and Mesoporous Materials,2008,114(1-3):166-174.
[6]Li P,Deng S H,Li Y B,et al.First-principles study on neutral nitrogen impurities in zinc oxide[J].Chinese Journal of Chemical Physics,2012,25(1):48-52.
[7]Setiawati E,Kawano K.Stabilization of anatase phase in the rare earth;Eu and Sm ion doped nanoparticle TiO2[J].Journal of Alloys and Compounds,2008,451(1):293-296.
[8]陈垚翰,沈俊,张昭.Si掺杂介孔SO2-4/TiO2的非模板剂法合成及表征[J].催化学报,2008,29(4):356-360.
[9]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.
[10]黄涛,张国亮,张辉,等.高性能纳米二氧化钛制备技术研究进展[J].化工进展,2010,29(3):498-504.
[11]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.
[12]童海霞,陈启元,胡慧萍,等.TiO2光催化活性向可见光区拓展的研究进展[J].功能材料,2005,9(36):1307-1311.
[13]张浩,许谨,曹现雷.基于BP神经网络优化制备Cu-CeTiO2及其光催化活性研究[J].环境科学学报,2015,35(8):2450-2456.
[14]张浩,曹现雷,唐刚,等.基于正交实验设计制备Cu-CeTiO2的多元非线性回归分析[J].环境工程学报,2015,9(7):3368-3372.
[15]张浩,刘秀玉,朱庆明,等.Cu掺杂TiO2光催化降解室内甲醛气体的实验研究[J].过程工程学报,2012,12(4):696-701.
[16]张浩,钱付平.Ce掺杂TiO2催化剂的光催化性能[J].过程工程学报,2011,11(3):514-518.
[17]张浩,何兆芳,黄新杰.Cu-Ce/TiO2的制备及其在室内甲醛气体中的光催化性能[J].稀土,2014,35(6):72-78.
[18]张浩,刘守城,胡义,等.基于正交设计与BP神经网络优化制备Cu-Ce/TiO2的预测模型[J].稀土,2015,36(2):72-77.