铕掺杂TiO_2复合材料光催化降解罗丹明B的研究
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摘要
采用常温络合-水解法,四氯化钛、氨水、盐酸等为原料制备TiO_2-Eu(铕掺杂二氧化钛)光催化剂,通过X射线衍射仪(XRD)、扫描电子显微镜(SEM)、荧光分光光度计(UV-vis)和光催化反应仪对其形态、结构、组成及性能进行表征。利用TiO_2-Eu催化剂脱除模拟废水中的罗丹明B,研究了在紫外光和可见光照射下,不同铕掺杂比例对于催化剂降解效率的影响。结果表明:合成二氧化钛为锐钛矿和板钛矿混合晶型,TiO_2-Eu光催化剂为纳米微球状,结构均匀,平均粒径2~4μm,氧化铕掺杂的最佳比例为0.75%(质量分数),可见光照射70 min后,降解罗丹明B模拟废水效率为96.8%;紫外光照射1 h后,罗丹明B模拟废水降解效率为98.8%。
Eu-doped TiO_2 photocatalytic nanoparticles has been prepared by complexation-hydrolysis method at room temperature using Ti Cl4,NH3·H2 O,HCl,etc. as raw materials. The dye Rhodamine B was taken as the degradation product,and the photocatalytic performance of TiO_2 photocatalyst through the different irradiation. The phase structure,absorption spectrum of samples were characterized by X-ray diffraction( XRD) 、Scanning electron microscope( SEM) and UV-visible spectrophotometer( UV-vis),respectively. The results show that the crystal form is the mixture of anatase and brookite TiO_2. After Eu3 +doped,the photocatalyst is changed to the style of nanospheres,when the doping content of Eu3 +is0. 75%( mass fraction),the data show the best photocatalytic activity of the TiO_2-Eu,and the absorption spectrum of the samples is widened to the visible region. After exposed to sunlight for 70 min,the degradation efficiency reached 96. 8% for the Rhodamine B reactant with the concentration of 5 mg/m L,and the degradation efficiency is 98. 8% after being irradiated by UV for 1 h.
Eu-doped TiO_2 photocatalytic nanoparticles has been prepared by complexation-hydrolysis method at room temperature using Ti Cl4,NH3·H2 O,HCl,etc. as raw materials. The dye Rhodamine B was taken as the degradation product,and the photocatalytic performance of TiO_2 photocatalyst through the different irradiation. The phase structure,absorption spectrum of samples were characterized by X-ray diffraction( XRD) 、Scanning electron microscope( SEM) and UV-visible spectrophotometer( UV-vis),respectively. The results show that the crystal form is the mixture of anatase and brookite TiO_2. After Eu3 +doped,the photocatalyst is changed to the style of nanospheres,when the doping content of Eu3 +is0. 75%( mass fraction),the data show the best photocatalytic activity of the TiO_2-Eu,and the absorption spectrum of the samples is widened to the visible region. After exposed to sunlight for 70 min,the degradation efficiency reached 96. 8% for the Rhodamine B reactant with the concentration of 5 mg/m L,and the degradation efficiency is 98. 8% after being irradiated by UV for 1 h.
引文
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[3]王小丽,谢昆,李廷真,等.氮镧共掺杂的二氧化钛光催化剂制备及其工艺优化[J].人工晶体学报,2018,47(2):430-440.
[4]刘丽静,季喜燕,高俊芳.铽掺杂纳米二氧化钛的制备及光催化性能的研究[J].四川大学学报(自然科学版),2018,55(2):357-360.
[5]井立强,孙晓君,蔡伟民,等.掺杂Ce的Ti O2纳米粒子的光致发光及其光催化活性[J].化学学报,2003,61(8):1241-1245.
[6]孙建红,眭慧东,王紫薇,等.铕掺杂纳米二氧化钛透明光触媒乳液的制备及光催化性能研究[J].中国光学,2017,10(6):760-767.
[7]焦秀烨,韩晶.铕掺杂二氧化钛纳米晶的制备和发光性质[J].东北林业大学学报,2009,37(6):83-85.
[8]Song Ch Y,Liu D Ch,Wei L B,et al.Study on the Preparation and Photocatalytic Performance of Eu/N-doped Titanium Dioxide[J].Acta.Sci.Nat.Uni.Sun,2007,46:35-36.
[9]石建稳,郑经堂,胡燕,等.铕掺杂对二氧化钛光催化降解甲基橙性能的影响[J].稀土,2007,28(3):68-70.
[10]邢吉龙.稀土改性Ti O2纳米颗粒光催化活性研究[D].天津:天津大学,2009.
[11]Jing L Q,Qu Y C.,Wang B Q,Review of photoluminescence performance of nano-sized semiconductor materials and its relationships with photocatalytic activity[J].Solar Energy Materials&Solar Cells,2006,90:1773-1787.
[12]Ni M,Leung M K H,Leung D Y C,et al.A review and recent developments in photocatalytic water-splitting using Ti O2for hydrogen production[J].Renewable Sustainable Energy Review,2007,11:401-425.
[13]Yang P,Lu C,Hua N P,et al.Titanium Dioxide Nanoparticles Co-doped with Fe3+and Eu3+Ions for Photocatalysis[J].Material Letters,2002,57:794-801.