CAJ | 학술논문

采用浸渍法制备了表面AgX(X = I, Br)等离子基元修饰的ZnO纳米柱状阵列,研究了浸渍浓度和时间以及紫外光光照预处理对ZnO纳米柱状阵列可见光光催化活性的影响。采用场发射扫描电子显微镜、X射线衍射仪、紫外可见漫反射吸收光谱以及X射线光电子能谱仪等手段对ZnO纳米柱状阵列的形貌、相组成、禁带宽度及其表面特性进行了表征。结果显示, AgBr颗粒分布于ZnO纳米柱状阵列的顶端及顶端侧面,同时AgBr颗粒之间相互接触而形成网状结构。通过紫外光光照预处理, AgBr表面出现细小颗粒,形成Ag/AgBr/ZnO纳米复合结构。可见光光催化降解甲基橙结果表明,在相同工艺条件下所制AgBr/ZnO的可见光光催化活性明显优于AgI/ZnO,且与浸渍浓度及时间有关。由于ZnO纳米柱状阵列的比表面积大, AgBr的可见光响应特性以及Ag/AgBr纳米结构的表面等离子效应,经过紫外光光照预处理形成的Ag/AgBr/ZnO纳米复合结构表现出最好的可见光光催化活性。
채용침지법제비료표면AgX(X = I, Br)등리자기원수식적ZnO납미주상진렬,연구료침지농도화시간이급자외광광조예처리대ZnO납미주상진렬가견광광최화활성적영향。채용장발사소묘전자현미경、X사선연사의、자외가견만반사흡수광보이급X사선광전자능보의등수단대ZnO납미주상진렬적형모、상조성、금대관도급기표면특성진행료표정。결과현시, AgBr과립분포우ZnO납미주상진렬적정단급정단측면,동시AgBr과립지간상호접촉이형성망상결구。통과자외광광조예처리, AgBr표면출현세소과립,형성Ag/AgBr/ZnO납미복합결구。가견광광최화강해갑기등결과표명,재상동공예조건하소제AgBr/ZnO적가견광광최화활성명현우우AgI/ZnO,차여침지농도급시간유관。유우ZnO납미주상진렬적비표면적대, AgBr적가견광향응특성이급Ag/AgBr납미결구적표면등리자효응,경과자외광광조예처리형성적Ag/AgBr/ZnO납미복합결구표현출최호적가견광광최화활성。
AgX (X = I, Br) nanoparticles-surface modified ZnO nanorod arrays (AgX/ZnO) were prepared using an impregnation method. The influence of impregnating solution concentration, immersion time, and UV light illumination pretreatment on the visible light-driven photocatalytic activity of AgX/ZnO was evaluated. The morphology, phase composition, band gap, and surface characteristics of the AgX/ZnO nanorod arrays were assessed by field-emission scanning electron microscopy, X-ray diffraction, diffuse reflectance UV-Vis absorption spectroscopy, and X-ray photoelectron spec-troscopy. The AgBr nanoparticles were homogeneously distributed on the top and side surfaces of the ZnO nanorods, and connected to form a porous network structure. Following UV light illumina-tion pretreatment, Ag nanoparticles were formed on the surface of the AgBr nanoparticles produc-ing a Ag/AgBr/ZnO nanostructure. Methyl orange photodegradation study showed that the photo-catalytic activity of AgBr/ZnO was higher than that of AgI/ZnO, synthesized under similar condi-tions, and was highly related to the impregnating solution concentration and immersion time. Ow-ing to the high surface area of the ZnO nanorod arrays, the visible light sensitivity of AgBr, and sur-face plasmon resonance of Ag/AgBr, Ag/AgBr/ZnO exhibited the highest visible light-driven photo-catalytic activity.