CAJ | 학술논문

　　将硝酸银的乙醇溶液与溶胶凝胶TiO2混合得到前驱体，随后经共沉淀-煅烧制备得到 AgBr/TiO2复合材料；采用扫描电镜、X射线衍射仪、X射线光电子能谱仪分析了复合材料的形貌、晶体结构、Ag元素的价态，采用紫外-可见漫反射光谱仪测定了其光吸收性能；进而以甲基橙（MO）的可见光降解为探针反应测定了 AgBr/T iO2复合材料的可见光催化性能。结果表明，当前驱体在不同温度下煅烧后，无定形 T iO2颗粒逐渐增大，并逐渐转变为锐钛矿结构；担载的AgBr可明显拓展TiO2的可见光吸收范围；Ag物种主要以Ag＋形式存在。当煅烧温度为300℃时，复合材料的光催化活性最高，M O的降解率在60 min内达到90％以上；随着煅烧温度的增加，催化活性逐渐降低。
　　장초산은적을순용액여용효응효TiO2혼합득도전구체，수후경공침정-단소제비득도 AgBr/TiO2복합재료；채용소묘전경、X사선연사의、X사선광전자능보의분석료복합재료적형모、정체결구、Ag원소적개태，채용자외-가견만반사광보의측정료기광흡수성능；진이이갑기등（MO）적가견광강해위탐침반응측정료 AgBr/T iO2복합재료적가견광최화성능。결과표명，당전구체재불동온도하단소후，무정형 T iO2과립축점증대，병축점전변위예태광결구；담재적AgBr가명현탁전TiO2적가견광흡수범위；Ag물충주요이Ag＋형식존재。당단소온도위300℃시，복합재료적광최화활성최고，M O적강해솔재60 min내체도90％이상；수착단소온도적증가，최화활성축점강저。
The ethanol solution of silver nitrate was mixed with sol-gel TiO2 to obtain a precur-sor .As-obtained precursor was then co-precipitated and calcinated to yield AgBr/TiO2 compos-ite .The morphology ,crystal structure ,and silver valence of as-prepared AgBr/TiO2 compos-ite were analyzed by means of scanning electron microscopy ,X-ray diffraction ,and X-ray pho-toelectron spectroscopy ,and its light-absorbing performance was examined by means of ultra-violet-visible light diffuse reflectance spectrometry .Furthermore ,the catalytic activity of as-prepared AgBr/TiO2 composite was evaluated by monitoring the degradation of methyl orange (MO) under visible light irradiation .Results show that after the mixed precursor is calcinated at different temperatures ,the size of amorphous TiO2 particles gradually increases ,and the amorphous TiO2 is gradually transformed into anatase .Besides ,incorporated AgBr is able to significantly expand the visible light absorption range of TiO 2 ,and silver species mainly exists in the form of Ag + .Particularly ,AgBr/TiO2 composite obtained after calcination at 300 ℃possesses the best photocatalytic activity and provides a degradation rate of above 90% for MO within 60 min .However ,the photocatalytic activity of AgBr/TiO2 composite declines gradual-ly with rising temperature of calcination .