CAJ | 학술논문

用沸腾回流直接水解法制备了粒径为25～35 nm纯锐钛矿型纳米二氧化钛(TiO2).用X射线衍射和透射电镜表征材料的结构与形貌.用该催化剂催化降解甲基橙,研究了催化剂用量、甲基橙的起始浓度、溶液pH值、光强度、溶液中添加金属离子的影响.结果表明:在较强紫外光照射下,当甲基橙的起始浓度为0.02 g/L,TiO2用量为1.0g/L,光催化效率最高.酸性条件有利于光催化降解甲基橙.掺加Fe3+或Zn2+的光催化效率显著增加.掺加Mn2+或Ca2对光催化活性没有影响.在紫外光区域(366 nm),样品对催化降解水溶液中甲基橙的活性较高.
용비등회류직접수해법제비료립경위25～35 nm순예태광형납미이양화태(TiO2).용X사선연사화투사전경표정재료적결구여형모.용해최화제최화강해갑기등,연구료최화제용량、갑기등적기시농도、용액pH치、광강도、용액중첨가금속리자적영향.결과표명:재교강자외광조사하,당갑기등적기시농도위0.02 g/L,TiO2용량위1.0g/L,광최화효솔최고.산성조건유리우광최화강해갑기등.참가Fe3+혹Zn2+적광최화효솔현저증가.참가Mn2+혹Ca2대광최화활성몰유영향.재자외광구역(366 nm),양품대최화강해수용액중갑기등적활성교고.
Pure anatase phase titanium dioxide(TiO2) with 25-35 nm grain size was prepared by direct hydrolysis under boiling reflux conditions. The structure and morphology of the materials were characterized by X-ray diffraction and transmission electron microscope. This catalyst was used for the photocatalytic degradation of methyl orange. The effects of the catalyst loading, initial concentration of methyl orange, pH value, light intensity, and addition of metal ions in solution were investigated. Experimental results indicate that the photocatalytic efficiency is best when the initial concentration of the methyl orange is 0.02 g/L, the loading concentration of TiO2 is 1.0 g/L and the UV irradiation is at a higher light intensity. Acidic medium accelerated the photocatalytic degradation rate of methyl orange. The degradation rate increased considerably with the addition of Fe3+ or Zn2+. The effects of the addition of Mn2+ and Ca2+ on the photocatalytic activity were not notable. The specimen showed good photoactivity upon the degradation of the methyl orange in aqueous solution in the ultraviolet range (366 nm).