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首页> 外文期刊>RSC Advances >Fabricating a g-C3N4/CuOx heterostructure with tunable valence transition for enhanced photocatalytic activity
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Fabricating a g-C3N4/CuOx heterostructure with tunable valence transition for enhanced photocatalytic activity

机译：用可调谐效果过渡制造G-C3N4 / CUOX异质结构，以增强光催化活性

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Heterostructured g-C _(3) N _(4) /CuO _( x ) nanocomposites were successfully prepared with varying the content of g-C _(3) N _(4) via a mixed solvent-thermal method. Organic ammonia ethanolamine was used as the reductant to adjust the valence of CuO _( x ) . Meanwhile, the bulk g-C _(3) N _(4) was efficiently exfoliated into ultrathin nanoplates during the synthesis process. It is found that the different contents of g-C _(3) N _(4) can effectively accelerate the valence transition of Cu in the nanocrystals. That is, the successive appearance of CuO and Cu _(2) O with the enhancement of g-C _(3) N _(4) content. These heterostructured composites were characterized for structural, morphological, elemental distribution, optical properties, specific surface area and photo-generated carrier separation efficiency by X-ray diffraction (XRD), scanning electron microscopy (SEM), high resolution transmission electron microscopy (HRTEM), Brunauer–Emmett–Teller (BET), diffuse reflectance spectroscopy (DRS) and photoluminescence (PL) spectrum. The photocatalytic performance investigations indicate that the CN5–CuO _( x ) is stable enough and shows a remarkable photocatalytic efficiency for degrading methyl orange (MO) under simulated sunlight irradiation, compared with the pure CuO _( x ) nanocrystals. The enhanced photocatalytic performance can be attributed to the enlarged surface area, beneficial heterojunction among Cu _(2) O@g-C _(3) N _(4) and efficient carrier separation efficiency. The abundant Cu substrate in the CuO _( x ) nanocrystals functions as a rapid electron/hole pair transfer avenue and inhibits their recombination. Thus the photocatalytic efficiency is tremendously enhanced.
机译：通过混合溶剂热法改变G-C _（3）N _（4）的含量，成功制备了异质结构的G-C _（3）N _（4）/ CUO _（X）纳米复合材料。使用有机氨乙醇胺作为还原剂来调节CuO _（X）的价。同时，在合成过程中，将块状G-C _（3）N _（4）有效地剥离到超薄纳米层中。发现G-C _（3）N _（4）的不同含量可以有效地加速Cu在纳米晶体中的价转变。也就是说，CuO和Cu _（2）o的连续外观具有增强G-C _（3）N _（4）内容。这些异质结构复合材料的特征在于通过X射线衍射（XRD），扫描电子显微镜（SEM），高分辨率透射电子显微镜（HRTEM）进行结构，形态，元素分布，光学性质，比表面积和光产生的载波分离效率，Brunauer-Emmett-Teller（BET），弥漫反射光谱（DRS）和光致发光（PL）光谱。光催化性能研究表明，与纯CuO _（x）纳米晶体相比，CN5-CuO _（X）足够稳定，并显示出降解甲基橙（Mo）的显着光催化效率，与纯CuO _（x）纳米晶体相比。增强的光催化性能可以归因于Cu _（2）O @ G-C _（3）N _（4）和有效的载波分离效率中的放大的表面积，有益异质结。 CuO _（x）纳米晶中的丰富Cu衬底用作快速电子/孔对转移大道并抑制其重组。因此，光催化效率得到巨大增强。

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