(桂林電子科技大學(xué) 材料科學(xué)與工程學(xué)院，桂林 541004)
摘 要: 以Bi(NO)3·5H2O、Na2WO4·2H2O為原料，采用水熱合成法成功制備出納米片組成的球形Bi2WO6，并采用X射線衍射(XRD)、掃描電子顯微鏡(SEM)和紫外-可見漫反射(UV-Vis)技術(shù)對(duì)其進(jìn)行分析表征，研究水熱溫度和反應(yīng)時(shí)間對(duì)催化劑合成的影響。通過在紫外及可見光(λ＞420 nm)照射下，降解羅丹明B(RhB、5 mg/L)溶液來評(píng)估其光催化活性，并且考察了催化劑投加量、RhB的初始濃度、光源對(duì)羅丹明B降解率的影響。結(jié)果表明，在180 ℃水熱7 h為最佳制備工藝；催化劑的投加量為2 g/L時(shí)，以紫外光為光源，照射120 min對(duì)RhB的降解率可達(dá)到99.8%。
關(guān)鍵字: Bi2WO6光催化劑；水熱合成法；羅丹明B；可見光；光催化活性
（School of Materials Science and Engineering, Guilin University of Electronic Technology, Guilin 541004, China）
Abstract:Spherical Bi2WO6 photocatalysts were synthesized by hydrothermal method with different hydrothermal temperature and reaction time using Bi(NO)3·5H2O and Na2WO4·2H2O as raw materials, which were further characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and UV-Vis diffusion reflectance spectra techniques. The photocatalytic activity of Bi2WO6 photocatalysts was evaluated by degrading Rhodamine B (RhB, 5 mg/L) under ultraviolet and visible light irradiation (λ＞420 nm). The influence of dosage of catalyst, initial concentration of RhB and light source on degradation rate was also investigated. The results indicate that 180 ℃ and 7 h are the proper conditions for preparing Bi2WO6 powders. When the dosage of Bi2WO6 catalyst is 2 g/L and the ultraviolet irradiate time is 120 min, the degradation rate of RhB is up to 99.8%.
Key words: Bi2WO6 photocatalyst; hydrothermal synthesis; Rhodamine B; visible light; photocatalytic activity
