CAJ | 학술논문

采用硬脂酸溶液燃烧法直接合成了具有较高比表面积钙钛矿型LaFeO_3和α-Fe_2O_3.通过X射线衍射、扫描电镜、傅里叶红外、紫外可见漫反射及光电子能谱等技术对其进行了表征.所合成的LaFeO_3在紫外和可见光区有明显吸收.紫外和太阳光下以LaFeO_3为催化剂,对2,4,6-三硝基甲苯(TNT)模拟废水进行了初步的光催化降解研究.实验结果表明:太阳光下0.5×10~(-3) mol LaFeO_3对TNT的光催化降解效果与紫外光下相当;1 h内降解率达51%,表现了较好的光催化活性;另外,紫外光下LaFeO_3光催化效果明显优于α-Fe_2O_3,这与LaFeO_3表面吸附了较多的吸附氧与羟基相关.
채용경지산용액연소법직접합성료구유교고비표면적개태광형LaFeO_3화α-Fe_2O_3.통과X사선연사、소묘전경、부리협홍외、자외가견만반사급광전자능보등기술대기진행료표정.소합성적LaFeO_3재자외화가견광구유명현흡수.자외화태양광하이LaFeO_3위최화제,대2,4,6-삼초기갑분(TNT)모의폐수진행료초보적광최화강해연구.실험결과표명:태양광하0.5×10~(-3) mol LaFeO_3대TNT적광최화강해효과여자외광하상당;1 h내강해솔체51%,표현료교호적광최화활성;령외,자외광하LaFeO_3광최화효과명현우우α-Fe_2O_3,저여LaFeO_3표면흡부료교다적흡부양여간기상관.
Perovskite-type oxide LaFeO_3 and α-Fe_2O_3 with high specific surface areas were directly syn-thesized by stearic acid solution combustion method. The obtained powders were characterized by XRD, SEM, FT-IR, UV-Vis DRS and XPS techniques. Photocatalytic degradation of simulative wastewater of 2, 4, 6-trinitromethylbenzene (TNT) were preliminary studied using solar/UV illumi-nated LaFeO_3. The experimented results show that 0.000 5 tool LaFeO_3 under ultraviolet has the same photocatalytic activation as it does under solar; the degradation rate of TNT is 51% within 1 h; under ultraviolet, the catalytic activity of LaFeO_3 is higher than that of α-Fe_2O_3 which is due to the high con-centrations of surface-adsorbed oxygen and hydroxyl of LaFeO_3.