CAJ | 학술논문

采用聚丙烯酰胺凝胶法制备了 BiVO4颗粒,利用 X 射线衍射、扫描电镜和紫外-可见漫反射光谱对样品进行了表征.结果表明,所制 BiVO4颗粒为单斜白钨矿结构,其形貌规整,近似呈球形,颗粒尺寸分布均匀,平均粒径约为400 nm,带隙为2.49 eV.以亚甲基蓝为目标降解物,在模拟太阳光辐照下考察了 BiVO4颗粒的光催化性能,研究了 O2, N2,乙醇及 KI 的添加对光催化效率的影响.以对苯二甲酸为探测剂,采用荧光光谱检测了催化剂在模拟太阳光照射下产生羟基自由基(·OH)的情况,探讨了其中的光催化机理.研究表明,?OH 和光生 h+是 BiVO4光催化降解亚甲基蓝的两种主要活性物种.
채용취병희선알응효법제비료 BiVO4과립,이용 X 사선연사、소묘전경화자외-가견만반사광보대양품진행료표정.결과표명,소제 BiVO4과립위단사백오광결구,기형모규정,근사정구형,과립척촌분포균균,평균립경약위400 nm,대극위2.49 eV.이아갑기람위목표강해물,재모의태양광복조하고찰료 BiVO4과립적광최화성능,연구료 O2, N2,을순급 KI 적첨가대광최화효솔적영향.이대분이갑산위탐측제,채용형광광보검측료최화제재모의태양광조사하산생간기자유기(·OH)적정황,탐토료기중적광최화궤리.연구표명,?OH 화광생 h+시 BiVO4광최화강해아갑기람적량충주요활성물충.
BiVO4 particles were prepared by a polyacrylamide gel method and characterized by X-ray diffraction, scanning electron micros-copy, and ultraviolet-visible diffuse reflectance spectroscopy. The results demonstrate that the as-prepared BiVO4 particles crystallize in a monoclinic scheelite-type structure, are regularly shaped like spheres with a uniform size of ~400 nm, and have a bandgap energy of 2.49 eV. The photocatalytic activity of BiVO4 particles was evaluated by the degradation of methylene blue under simulated sunlight irradiation. The effects of O2, N2, ethanol, and KI on the photocatalytic efficiency were investigated. Hydroxyl radicals (?OH) formed on the catalyst under simulated sunlight irradiation were detected by photoluminescence spectroscopy using terephthalic acid as a probe molecule. The photocata-lytic degradation mechanism involved is discussed in detail. Based on the photocatalytic results, hydroxyl radicals and photogenerated h+ are suggested to be the two main active species toward the photocatalytic degradation of methylene blue by BiVO4.