Preparation of graphitic carbon nitride (g-C3N4)/WO3 composites and enhanced visible-light-driven photodegradation of acetaldehyde gas
Preparation of graphitic carbon nitride (g-C3N4)/WO3 composites and enhanced visible-light-driven photodegradation of acetaldehyde gas
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DOI：
10.1016/j.jhazmat.2013.05.058
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发表时间：
2013-09-15
影响因子：
13.6
通讯作者：
Okada, Kiyoshi
中科院分区：
文献类型：
--
作者：
Katsumata, Ken-ichi;Motoyoshi, Ryosuke;Okada, Kiyoshi
制备了新型可见光驱动石墨氮化碳（g-C3 N4）/WO 3复合光催化剂，并评价了其对乙醛（CH 3CHO）的降解活性。采用X射线衍射（XRD）、傅里叶变换红外光谱（FT-IR）、扫描电子显微镜（SEM）、透射电子显微镜（TEM）、紫外-可见漫反射光谱（UV-vis）和N2气体吸附BET法（N2-BET）对所制备的g-C3 N4/WO 3复合材料进行了表征。尺寸为100-300 nm的WO 3颗粒与g-C3 N4片表面直接接触。复合材料的光学带隙和比表面积分别为2.65-2.75 eV和4-7 m2/g。与g-C3 N4相比，g-C3 N4/WO 3复合材料在可见光照射下表现出更高的光降解CH 3CHO活性。确定了异质结结构的CH 3CHO光降解活性的最佳WO 3含量。g-C3 N4和WO 3的协同效应被认为导致改善的光生载流子分离。提出了g-C3 N4/WO 3复合光催化剂在可见光照射下降解CH 3CHO的可能机理。这些结果将有益地扩展g-C3 N4作为可见光驱动的光催化剂的应用。(C)2013爱思唯尔有限公司版权所有。
Novel visible-light-driven graphitic carbon nitride (g-C3N4)/WO3 composite photocatalysts were prepared, and the acetaldehyde (CH3CHO) degradation activity of these composites was evaluated. The prepared g-C3N4/WO3 composites were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), transmission electron microscopy (TEM), ultraviolet-visible diffuse reflection spectroscopy (UV-vis), and the N2 gas adsorption Brunauer-Emmett-Teller (BET) method (N2-BET). The WO3 particles, which were 100-300 nm in size, were in direct contact with the g-C3N4 sheet surface. The optical band gap and specific surface area of the g-C3N4/WO3 composites were in the range of 2.65-2.75 eV and 4-7 m(2)/g, respectively. The g-C3N4/WO3 composites exhibited higher activity for the photodegradation of CH3CHO under visible light irradiation compared to g-C3N4. The optimal WO3 content for the CH3CHO photodegradation activity of the heterojunction structures was determined. The synergistic effect of g-C3N4 and WO3 was considered to lead to improved photogenerated carrier separation. A possible degradation mechanism of CH3CHO over the g-C3N4/WO3 composite photocatalyst under visible light irradiation was proposed. These results should usefully expand applications of g-C3N4 as a visible-light-driven photocatalyst. (C) 2013 Elsevier B.V. All rights reserved.