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首页> 外文期刊>Applied Surface Science >Enhanced photocatalytic performance of ZnSe/PANI nanocomposites for degradation of organic and inorganic pollutants
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Enhanced photocatalytic performance of ZnSe/PANI nanocomposites for degradation of organic and inorganic pollutants

机译：ZnSe / PANI纳米复合材料增强的光催化性能，可降解有机和无机污染物

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Current work presents a study about the effect of polyaniline (PANI) as an organic semiconductor on the photocatalytic performance of ZnSe nanoparticles (NPs). Pristine ZnSe NPs and ZnSe/PANI nanocomposites were synthesized by a simple and cost-effective co-precipitation method in the ambient conditions. X-ray diffraction (XRD), Raman, and Fourier-transform infrared spectroscopy (FTIR) results confirmed that, a heterojunction was created by ZnSe NPs and PANI composite. High-resolution transmission electron microscopy (HRTEM) image showed that the NPs were deposited by PANI completely and a core-shell structure was generated by ZnSe and PANI. Photoluminescence (PL) spectroscopy results showed the optical properties of the pristine ZnSe NPs and ZnSe/PANI nanocomposites were similar with lower defect emission intensity for the ZnSe/PANI nanocomposites. However, the PL and UV-Vis results revealed that, the PANI caused a decrease in band-gap value of the ZnSe/PANI nanocomposites in compared to the band-gap value of the pristine ZnSe NPs. In addition, X-ray photoelectron spectroscopy (XPS) results indicated that, the PANI caused a shift in the valance band (VB) and conduction band (CB) edges of ZnSe/PANI nanocomposites in compared with pristine ZnSe NPS. Finally, the photocatalytic performance of the products for removing of methylene blue (MB) and chromate ions was examined under a visible-light source irradiation. An enhancement photocatalytic performance for ZnSe/PANI nanocomposites in compared to the pristine ZnSe NPs was observed. Brunauer-Emmett-Teller (BET) results indicated that textural properties of the nanocomposites were decreased by PANI. According to the optical properties and band gap-value of the products a type-II heterojunction was created by band alignment of the ZnSe and PANI and such heterojunction was the most important factor for the enhancement photocatalytic performance of the ZnSe/PANI nanocomposites in compared to the photocatalytic activity of the pristine ZnSe NPs.
机译：当前的工作提出了关于聚苯胺（PANI）作为有机半导体对ZnSe纳米颗粒（NPs）的光催化性能的影响的研究。 ZnSe NPs和ZnSe / PANI纳米复合材料是在环境条件下通过简单且经济高效的共沉淀方法合成的。 X射线衍射（XRD），拉曼光谱和傅立叶变换红外光谱（FTIR）结果证实，ZnSe NPs和PANI复合物形成异质结。高分辨率透射电镜（HRTEM）图像显示，NPs完全被PANI沉积，而ZnSe和PANI生成核壳结构。光致发光（PL）光谱结果表明，原始ZnSe NP和ZnSe / PANI纳米复合材料的光学性质相似，而ZnSe / PANI纳米复合材料的缺陷发射强度较低。但是，PL和UV-Vis结果表明，与原始ZnSe NPs的带隙值相比，PANI导致ZnSe / PANI纳米复合材料的带隙值减小。另外，X射线光电子能谱（XPS）结果表明，与原始的ZnSe NPS相比，PANI引起了ZnSe / PANI纳米复合物的价带（VB）和导带（CB）边缘的偏移。最后，在可见光源照射下检查了产物对亚甲基蓝（MB）和铬酸根离子的去除的光催化性能。观察到与原始的ZnSe NPs相比，ZnSe / PANI纳米复合材料具有增强的光催化性能。 Brunauer-Emmett-Teller（BET）结果表明，PANI降低了纳米复合材料的结构性能。根据产物的光学性质和带隙值，通过ZnSe和PANI的能带对准产生了II型异质结，与之相比，这种异质结是增强ZnSe / PANI纳米复合材料光催化性能的最重要因素。原始ZnSe NPs的光催化活性。

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