Mixed-calcination synthesis of CdWO4/g-C3N4 heterojunction with enhanced visible-light-driven photocatalytic activity
Mixed-calcination synthesis of CdWO4/g-C3N4 heterojunction with enhanced visible-light-driven photocatalytic activity
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DOI：
10.1016/j.apsusc.2015.07.154
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发表时间：
2015-12
影响因子：
6.7
通讯作者：
Na Tian;Hongwei Huang;Yihe Zhang
中科院分区：
文献类型：
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作者：
Na Tian;Hongwei Huang;Yihe Zhang
采用简单的混合煅烧方法，首次成功合成了CdWO4/g- c3n4复合光催化剂。采用x射线衍射（XRD）、傅里叶变换红外光谱（FTIR）、扫描电子显微镜（SEM）、透射电子显微镜（TEM）、高分辨率透射电子显微镜（HRTEM）和漫反射光谱（DRS）对制备样品的晶体结构、形貌和光学性能进行了分析。光催化实验表明，CdWO4/g- c3n4光催化剂在可见光（λ> 420 nm）下对rhodamine B的降解效率最高，分别是纯g- c3n4和CdWO4光催化剂的1.6倍和54.6倍。CdWO4/g-C3N4复合材料可见光催化活性的增强应归因于CdWO4与g-C3N4之间匹配的能带结构和界面相互作用，导致光生载流子的有效分离和转移。光致发光光谱（PL）和活性物质捕获实验证实了这一结论。
CdWO4/g-C3N4composite photocatalysts have been successfully synthesized by a simple mixed-calcination method for the first time. X-ray diffraction (XRD), Fourier transforms infrared spectroscopy (FTIR), scanning electron microscopy (SEM), transmission electron microscopy (TEM), high resolution transmission electron microscopy (HRTEM) and diffuse reflection spectroscopy (DRS) were carried out to analyze the crystal structure, morphology and optical property of the as-prepared samples. The photocatalytic experiments on rhodamine B (RhB) degradation showed that the 1:10 CdWO4/g-C3N4photocatalyst exhibited the highest efficiency for degradation of RhB under visible light (λ> 420 nm), which was almost 1.6 and 54.6 times as high as those of the pure g-C3N4and CdWO4, respectively. This enhancement in visible-light photocatalytic activity of CdWO4/g-C3N4composite should be attributed to the matchable band structures and interfacial interaction between CdWO4and g-C3N4, resulting in the efficient separation and transfer of photogenerated charge carriers. It was corroborated by the photoluminescence spectroscopy (PL) and active species trapping experiments.