CAJ | 학술논문

用Ti片和H2O2在较低的温度下通过控制反应时间制备了不同形貌的纳米TiO2.在80 ℃下反应10 min得到了和Ti片黏附较好的多孔纳米结构,延长反应时间先后得到了类化状和类棒状纳米结构.在80 ℃下反应4 h得到的纳米结构样品为非晶念,而反应10 h制备出以锐钛矿相为主的结晶念纳米结构.通过300 ℃退火得到的几乎是纯锐钛矿相的纳米TiO2.用紫外光照射降解RhB溶液的方法研究了纳米TiO2的光催化性能.结果表明7 cm2的退火后的类花状纳米TiO2降解染料分子的光催化效率是仪用紫外光降解的29.8倍.
용Ti편화H2O2재교저적온도하통과공제반응시간제비료불동형모적납미TiO2.재80 ℃하반응10 min득도료화Ti편점부교호적다공납미결구,연장반응시간선후득도료류화상화류봉상납미결구.재80 ℃하반응4 h득도적납미결구양품위비정념,이반응10 h제비출이예태광상위주적결정념납미결구.통과300 ℃퇴화득도적궤호시순예태광상적납미TiO2.용자외광조사강해RhB용액적방법연구료납미TiO2적광최화성능.결과표명7 cm2적퇴화후적류화상납미TiO2강해염료분자적광최화효솔시의용자외광강해적29.8배.
TiO2 nanostructures were fabricated by a reaction of Ti foils in H2O2 solution at mild temperature. Porous TiO2 nanostructures, well-adhered to Ti foil surfaces, were formed at 80 ℃ in 10 min, and then flowerlike and rod nanostructures formed in succession after a longer reaction time. Samples prepared at 80 ℃for 4 h are amorphous, and anatase-dominated crystal phase emerged in the sample prepared for as long as 10 h. Almost pure anatase phase were obtained in TiO2 nanostructures by annealing the samples at a temperature of 300 ℃. Photocatalysis of the TiO2 nanostructures was characterized by the degradation of RhB dye molecules in an aqueous solution exposed to ultraviolet light. Results show a 7 cm2 annealed TiO2 flower-like nanostructure having the degradation rate of RhB as fast as 29.8 times that of the dye solutiun exposed to ultraviolet light alone.