CAJ | 학술논문

采用水热法在γ-Bi2MoO6光催化剂表面修饰了纳米级Cu2O,得到了具有高效可见光响应的复合光催化材料,并利用X射线粉末衍射(XRD)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)、选区电子衍射(SAED)、X射线光电子能谱(XPS)和紫外-可见漫反射光谱(UV-Vis-DRS)等技术对其相结构、微观形貌和光吸收性能进行了表征.在可见光条件下(λ>400 nm)考察了Cu2O表面修饰对γ-Bi2MoO6光催化降解亚甲基蓝(MB)性能的促进作用.结果表明,纳米级Cu2O(~10 nm)颗粒均匀地修饰于γ-Bi2MoO6的表面,使γ-Bi2MoO6的可见光吸收带发生明显红移,且吸收强度大幅提高,增强了复合材料光生电子-空穴对的分离效率,从而使复合材料表现出较高的光催化活性.当Cu2O的表面修饰量为1.5%(w)时,复合光催化剂降解MB的活性与纯γ-Bi2MoO6相比提高了6.4倍.
채용수열법재γ-Bi2MoO6광최화제표면수식료납미급Cu2O,득도료구유고효가견광향응적복합광최화재료,병이용X사선분말연사(XRD)、소묘전자현미경(SEM)、투사전자현미경(TEM)、선구전자연사(SAED)、X사선광전자능보(XPS)화자외-가견만반사광보(UV-Vis-DRS)등기술대기상결구、미관형모화광흡수성능진행료표정.재가견광조건하(λ>400 nm)고찰료Cu2O표면수식대γ-Bi2MoO6광최화강해아갑기람(MB)성능적촉진작용.결과표명,납미급Cu2O(~10 nm)과립균균지수식우γ-Bi2MoO6적표면,사γ-Bi2MoO6적가견광흡수대발생명현홍이,차흡수강도대폭제고,증강료복합재료광생전자-공혈대적분리효솔,종이사복합재료표현출교고적광최화활성.당Cu2O적표면수식량위1.5%(w)시,복합광최화제강해MB적활성여순γ-Bi2MoO6상비제고료6.4배.
@@@@Nanosized cuprous oxide (Cu2O) was used to modify the surface ofγ-Bi2MoO6, resulting in highly efficient visible-light-responsive Cu2O/γ-Bi2MoO6 composite photocatalysts. The obtained photocatalysts were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), selected area electron diffraction (SAED), X-ray photoelectron spectroscopy (XPS), and UV-Vis diffuse reflectance spectrum (UV-Vis-DRS) to determine their phase structures, micro-morphologies, and light absorption properties. The important role of surface-modified Cu2O in improving the photocatalytic activity of γ-Bi2MoO6 under visible light irradiation was studied using the degradation of methylene blue (MB). The results showed that Cu2O nanoparticles with average size of ~10 nm modified the surface of theγ-Bi2MoO6. The nanoparticles delivered both an obvious red-shift of absorption threshold and intensity of the γ-Bi2MoO6, as wel as enhanced separation efficiency of photogenerated carriers, thereby leading to significant enhancement in photocatalytic activity. When the amount of Cu2O was 1.5%, the photocatalytic activity of the Cu2O/γ-Bi2MoO6 composite photocatalyst was 6.4 times higher than that of pristineγ-Bi2MoO6.