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首页> 外文期刊>RSC Advances >Adsorption-photocatalytic degradation of methyl orange over a facile one-step hydrothermally synthesized TiO2/ZnO-NH2-RGO nanocomposite
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Adsorption-photocatalytic degradation of methyl orange over a facile one-step hydrothermally synthesized TiO2/ZnO-NH2-RGO nanocomposite

机译：一步一步水热合成TiO2 / ZnO-NH2-RGO纳米复合材料的吸附-光催化降解甲基橙

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摘要

A novel TiO2/ZnO-NH2-reduced graphene oxide (TZ-a-RGO) nanocomposite was successfully prepared using a facile one-step hydrothermal method. The TZ-a-RGO was characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), Transmission electron microscopy (TEM), Brunauer-Emmett-Teller (BET) surface area analysis and UV-vis absorption spectrophotometry to investigate its structural features. The TZ-a-RGO was used as a catalyst to remove methyl orange (MO) from wastewater, and the results indicated that this catalytic system has a good performance in terms of removal of MO. The adsorption experiments of the TZ-a-RGO followed the pseudo-second-order kinetic model, and the adsorption isotherms were accurately represented by the Langmuir model. The degradation of methyl orange (MO) by TZ-a-RGO fitted well with the Langmuir-Hinshelwood model, and MO removal was obtained through a synergistic effect of adsorption and photocatalysis. The photocatalytic rate of MO over the composites was as high as 8.2 and 3.2 times that over commercial P25 (Degussa) and TiO2/ZnO, respectively. The potential photocatalytic mechanism for the TZ-a-RGO nanocomposite under UV was discussed.
机译：采用一种简便的一步水热法成功地制备了一种新型的TiO2 / ZnO-NH2-还原氧化石墨烯（TZ-a-RGO）纳米复合材料。 TZ-a-RGO的特征在于X射线衍射（XRD），傅立叶变换红外光谱（FTIR），透射电子显微镜（TEM），Brunauer-Emmett-Teller（BET）表面积分析和UV-vis吸收分光光度法研究其结构特征。 TZ-a-RGO用作从废水中去除甲基橙（MO）的催化剂，结果表明该催化系统在去除MO方面具有良好的性能。 TZ-a-RGO的吸附实验遵循拟二级动力学模型，吸附等温线可通过Langmuir模型精确表示。 TZ-a-RGO对甲基橙（MO）的降解与Langmuir-Hinshelwood模型非常吻合，并且通过吸附和光催化的协同作用获得了MO的去除。 MO对复合材料的光催化速率分别是市售P25（Degussa）和TiO2 / ZnO的8.2倍和3.2倍。讨论了TZ-a-RGO纳米复合材料在紫外光下的潜在光催化机理。

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