Ag掺杂R-TiO_2/A-TiO_2孔材料的合成及光催化性能研究
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摘要
以钛酸正丁酯、硝酸银和四氯化钛作为原料,以聚苯乙烯(PS)为模版,采用溶胶-凝胶法、结合水热及光照处理合成了银(Ag)不同掺杂量的金红石相复合锐钛矿相二氧化钛(R-TiO_2/A-TiO_2)多孔光催化材料。并对样品的结构、形貌、光吸收性能及比表面积进行表征,在光照条件下研究了对罗丹明B(RhB)的降解效果。研究结果表明,当Ag掺杂量为3%(wt,质量分数)制得的R-TiO_2/A-TiO_2光催化活性最佳,光照60min后,对RhB的降解率为99.8%。
R-TiO_2/A-TiO_2 photocatalytic materials with different Ag doping ratio were prepared using tetrabutyl titanate,silver nitrate and titanic tetrachloride as reaction precursors and polystyrene(PS)as the template by the sol-gel method,hydrothermal process and irradiation reaction.The structure,morphology,element distribution and specific surface area of R-TiO_2(5%)/A-TiO_2 were characterized by XRD,SEM,EDX,UV-Vis and BET.The photocatalytic degradation of rhodamine B solution was performed under UV-Vis light irradiation.According to experimental results,3% Ag doping ratio showed the better photocatalytic activity than other samples,indicating that rhodamine B degradation rate was about 99.8% after light irradiation for 60 min.
R-TiO_2/A-TiO_2 photocatalytic materials with different Ag doping ratio were prepared using tetrabutyl titanate,silver nitrate and titanic tetrachloride as reaction precursors and polystyrene(PS)as the template by the sol-gel method,hydrothermal process and irradiation reaction.The structure,morphology,element distribution and specific surface area of R-TiO_2(5%)/A-TiO_2 were characterized by XRD,SEM,EDX,UV-Vis and BET.The photocatalytic degradation of rhodamine B solution was performed under UV-Vis light irradiation.According to experimental results,3% Ag doping ratio showed the better photocatalytic activity than other samples,indicating that rhodamine B degradation rate was about 99.8% after light irradiation for 60 min.
引文
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[3]杜记民,王卫民,时琳,等.Ag掺杂TiO2纳米材料的合成、表征及光催化性能[J].化工新型材料,2011,39(9):36-39.
[4]Tanaka K,Capule M F V,Hisanaga T.Effect of crystallinity of TiO2on its photocatalytic action[J].Chem Phys,1991,187(1/2):73-76.
[5]范崇正,肖建平,丁言伟,等.纳米TiO2的制备与光催化研究进展[J].科学通报,2011,46(4):265-273.
[6]席北斗,刘鸿亮.钛酸四丁酯水解制备TiO2半导体光催化剂研究[J].环境科学学报,2001,21(2):144-147.
[7]阎建辉,黄可龙,刘素琴,等.银沉积纳米TiO2催化剂的制备及活性[J].应用化学,2005,22(2):132-137.
[8]Rao M V,Rajeshwar K,Verneker V R P,et al.Photosynthetic production of hydrogen and hydrogen peroxide on semiconducting oxide grains in aqueous solutions[J].J Phys Chem,1980,84:1987-1991.
[9]Ohno T,Tokieda K,Higashida S,et al.Synergism between rutile and anatase TiO2particles in photocatalytic oxidation of naphthalene[J].Appl Catal A,2003,244:383-391.
[10]Tachikawa T,Majima T.Single-molecule detection of reactive oxygen species:application to photocatalytic reactions[J].J Fluoresc,2007,17:727-738.