改性介孔TiO_(2)光催化材料的制备及其光催化降解污水的研究  

Preparation of modified mesoporous TiO_(2)photocatalytic materials andstudy on their photocatalytic degradation of wastewater

作　　者：白春英 萨仁图雅[2] BAI Chunying;Sarentuya(College of Chemical Engineering,Hulunbuir University,Hulunbeier 021008,China;Hohhot Vocational College,Hohhot 010051,China)

机构地区：[1]呼伦贝尔学院化学化工学院,内蒙古呼伦贝尔021008 [2]呼和浩特职业学院,呼和浩特010051

出　　处：《功能材料》2023年第10期10231-10236,共6页Journal of Functional Materials

基　　金：国家自然科学基金资助(12061033)。

摘　　要：以钛酸丁酯为钛源,Ag为添加相,基于溶胶-凝胶法制备了介孔TiO_(2)光催化材料,研究了不同摩尔分数Ag掺杂对介孔TiO_(2)的光催化性能、微观形貌和吸光性能的影响。结果表明,制备出的介孔TiO_(2)具有空心球状的外观,颗粒尺寸在45~70 nm之间,球状颗粒分散程度均匀,Ag的掺杂没有改变介孔TiO_(2)的空心球结构,均属于锐钛矿相。随着Ag掺杂摩尔分数的增大,TiO_(2)锐钛矿结构向金红石相转变的温度降低,加速了TiO_(2)的相变过程,且介孔TiO_(2)的禁带宽度减小,光谱响应范围扩大,光子电子-空穴对的复合概率降低。在325 nm的激发光照射下,当Ag掺杂摩尔分数为5%时,介孔TiO_(2)的吸收边在439 nm处,对应的禁带宽度最小为2.82 eV,其光致发光强度达到最低。在180 min内,当Ag掺杂摩尔分数为5%时,介孔TiO_(2)对RhB的降解率达到最大值98.76%,相比纯TiO_(2)的降解率提高了65.1%。由此可知,Ag掺杂的最佳摩尔分数为5%。Mesoporous TiO_(2)photocatalytic materials were prepared by sol-gel method with butyl titanate as titanium source and Ag as additive phase.The effects of different mole fractions of Ag doping on the photocatalytic performance,microstructure and absorbance of mesoporous TiO_(2)were studied.The results showed that the prepared mesoporous TiO_(2)had a hollow spherical appearance,the particle size was between 45~70 nm,and the spherical particles were evenly dispersed.The doping of Ag didn’t change the hollow spherical structure of mesoporous TiO_(2),which belonged to anatase phase.With the increase of Ag doping mole fraction,the transition temperature of TiO_(2)anatase structure to rutile phase decreased,which accelerated the phase transition process of TiO_(2),the band gap of mesoporous TiO_(2)decreased,the spectral response range expands,and the recombination probability of photon electron hole pairs decreased.Under the irradiation of 325 nm excitation light,when the Ag doping mole fraction was 5%,the absorption edge of mesoporous TiO_(2)was at 439 nm,the corresponding minimum band gap was 2.82 eV,and its photoluminescence intensity was the lowest.Within 180 minutes,when the molar fraction of Ag doping was 5%,the degradation rate of RhB by mesoporous TiO_(2)reached the maximum value of 98.76%,which was 65.1%higher than that of pure TiO_(2).From this,it can be seen that the optimal mole fraction for Ag doping is 5%.

关 键 词：TiO_(2) 光催化材料 介孔结构 光致发光 吸附降解 

分 类 号：O643.36[理学—物理化学]