CAJ | 학술논문

采用阳极氧化法和阴极电沉积法制备了Fe2O3,CuO和NiO纳米粒子改性的高度有序的TiO2纳米管(TiO2-NT)阵列.运用场发射扫描电子显微镜(FE-SEM),透射电子显微镜(TEM),X射线衍射(XRD)和紫外-可见漫反射光谱等手段对Fe2O3/TiO2-NT、CuO/TiO2-NT和NiO/TiO2O2-NT复合电极进行表征.以苯酚为模拟污染物,考察复合电极的光电性能.结果表明,金属氧化物(Fe2O3,CuO,NiO)纳米粒子成功沉积在TiO2-NTs的管口、内壁和管底.金属氧化物改性复合电极的光电催化活性比未改性的TiO2-NTs提高了2倍以上.Fe2O3/TiO2-NTs在可见光区显示出最高的吸收强度,以Fe2O3/TiO2-NTs为阳极处理苯酚废水,光照120 min后苯酚去除率达到96％,而未改性的TiO2-NTs的苯酚去除率只有41％.此外,Fe2O3/TiO2-NTs在生成低毒中间产物方面表现出良好的性能.较高的复合电极光电催化活性主要是由于TiO2纳米管和过渡金属氧化物纳米粒子间构筑的高界面面积异质纳米结构,有效地促进了电子转移,抑制了光生电子-空穴对的复合.
채용양겁양화법화음겁전침적법제비료Fe2O3,CuO화NiO납미입자개성적고도유서적TiO2납미관(TiO2-NT)진렬.운용장발사소묘전자현미경(FE-SEM),투사전자현미경(TEM),X사선연사(XRD)화자외-가견만반사광보등수단대Fe2O3/TiO2-NT、CuO/TiO2-NT화NiO/TiO2O2-NT복합전겁진행표정.이분분위모의오염물,고찰복합전겁적광전성능.결과표명,금속양화물(Fe2O3,CuO,NiO)납미입자성공침적재TiO2-NTs적관구、내벽화관저.금속양화물개성복합전겁적광전최화활성비미개성적TiO2-NTs제고료2배이상.Fe2O3/TiO2-NTs재가견광구현시출최고적흡수강도,이Fe2O3/TiO2-NTs위양겁처리분분폐수,광조120 min후분분거제솔체도96％,이미개성적TiO2-NTs적분분거제솔지유41％.차외,Fe2O3/TiO2-NTs재생성저독중간산물방면표현출량호적성능.교고적복합전겁광전최화활성주요시유우TiO2납미관화과도금속양화물납미입자간구축적고계면면적이질납미결구,유효지촉진료전자전이,억제료광생전자-공혈대적복합.
Composite electrodes consisting of highly ordered,vertically oriented TiO2 nanotube (TiO2-NT) arrays modified with Fe2O3,CuO,and NiO nanoparticles were successfully fabricated by a simple electrochemical anodization and electrodeposition method.Field emission scanning electron microscopy (FE-SEM),transmission electron microscopy (TEM),X-ray diffraction (XRD),and UV-Vis diffuse reflectance spectroscopy were used to characterize the structure and optical properties of the resulting Fe2O3/TiO2-NT,CuO/TiO2-NT,and NiO/TiO2-NT composite electrodes.The photoelectrochemical (PEC)activities of the composite electrodes were evaluated using phenol as a model pollutant.Results indicated that transition metal oxide nanoparticles were deposited on the mouth,tube wall,and base of the TiO2-NTs.The PEC activity of the composite electrodes was over twice that of an unmodified TiO2-NT electrode.The Fe2O3/TiO2-NT electrode showed the highest absorption intensity in the visible light region.After treatment for 120 min,the phenol removal efficiency using the Fe2O3/TiO2-NT anode could reach 96％,while it was only 41％ for the unmodified TiO2-NT anode.Moreover,the Fe2O3/TiO2-NT electrode tended to generate intermediates of low toxicity.The higher PEC activity of the composite electrodes was attributed to the presence of hetero-nanostructures with high interfacial area comprised of TiO2-NTs and transition metal oxide nanoparticles,which efficiently facilitated electron transfer and inhibited the recombination of photogenerated electron-hole pairs.