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首页> 外文期刊>RSC Advances >Synthesis of N-doped ZnO nanoparticles with cabbage morphology as a catalyst for the efficient photocatalytic degradation of methylene blue under UV and visible light
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Synthesis of N-doped ZnO nanoparticles with cabbage morphology as a catalyst for the efficient photocatalytic degradation of methylene blue under UV and visible light

机译：用卷心菜形态的N-掺杂ZnO纳米粒子的合成作为UV和可见光下亚甲基蓝色催化剂的催化剂

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In this study, the synthesis of nitrogen-doped zinc oxide nanoparticles with a cabbage like morphology (N-ZnONCBs) by a hydrothermal method using zinc acetate dihydrate as a precursor and hydrazine monohydrate as a nitrogen source is reported. N-ZnONCB were characterized using UV-visible Spectroscopy (UV-Vis), Fluorescence Spectroscopy, Fourier Transmittance Infrared Spectroscopy (FTIR), X-ray diffraction (XRD), Raman Spectroscopy, Thermogravimetric Analysis (TGA), Scanning Electron Microscopy (SEM), Transmission Electron Microscopy (TEM), Electron Dispersive Spectroscopy (EDS) and EDX elemental mapping. N-ZnONCBs were tested for their photocatalytic capabilities in the degradation of methylene blue (MB) under UV-light and visible light irradiation for about 0 to 80 minutes and 0 to 50 min respectively. The N-ZnONCB catalyst demonstrated improved photodegradation efficiency (98.6% and 96.2%) and kinetic degradation rates of MB ( k = ?0.0579 min ~(?1) and k = ?0.0585 min ~(?1) ) under UV light and visible light irradiation at different time intervals. The photodegradation study was also evaluated with different dosages of N-ZnONCB catalyst, different initial concentrations of MB and variation in the pH (3, 5, 9 and 11) of the solution of MB under UV light and visible light irradiation. The photocatalytic degradation intermediate products were obtained by liquid chromatography mass spectra (LC-MS) and also complete mineralization was determined by using Total Organic Carbon (TOC) studies. This photocatalyst was also tested with 2,4-dichlorophenol (2,4-DCP) under visible light irradiation at different time intervals. Fluorescence and quenching studies were performed for the binding interaction between the N-ZnONCB catalyst and MB dye. A Zetasizer was used to find the charge and average size of the N-ZnONCB catalyst and also the charge of the N-ZnONCB catalyst before and after MB dye solution adsorption. The N-ZnONCB catalyst was also tested for its photostability and reusability with a percentage degradation rate of MB (93.2%) after 4 cycle experiments. These results have clearly demonstrated that the N-ZnONCB catalyst can be applied for the photocatalytic degradation of MB from wastewater samples.
机译：在该研究中，通过作为氮源作为前体和肼一水合物的水热法，通过作为氮源的前体和肼一水合物的水热法合成具有形态（N-ZnONCBS）的氮掺杂氧化锌纳米颗粒的形态（N-ZnOncbs）。使用UV可见光谱（UV-VI），荧光光谱，傅立叶透射率红外光谱（FTIR），X射线衍射（XRD），拉曼光谱，热重度分析（TGA），扫描电子显微镜（SEM）（SEM） ，透射电子显微镜（TEM），电子分散光谱（EDS）和EDX元素映射。在紫外光下，在亚甲基蓝（Mb）的降解中测试了N-ZnOncbs的光催化能力分别为可见光照射约0至80分钟和0至50分钟。 N-ZnONCB催化剂的光降解效率（98.6％和96.2％）和Mb的动力学降解率提高（k = = 0.0579分钟〜（α1）和k =Δ0.0585min〜（？1））以不同的时间间隔照射。还采用不同剂量的N-ZnONCB催化剂，不同初始浓度的MB，MB溶液的不同剂量的初始浓度的MB和PH（3,5,9和11）的不同剂量进行评估，并在UV光下和可见光照射。通过液相色谱质谱（LC-MS）获得光催化降解中间产物，并通过使用总有机碳（TOC）研究确定完全矿化。在不同时间间隔的可见光照射下，该光催化剂也用2,4-二氯苯酚（2,4-DCP）进行测试。对N-ZnONCB催化剂和MB染料之间的结合相互作用进行荧光和猝灭研究。使用Zetasizer来找到N-ZnONCB催化剂的电荷和平均尺寸，以及MB染料溶液吸附前后N-ZnONCB催化剂的电荷。还测试了N-ZnONCB催化剂的光稳定性和可重用性，在4个循环实验后，Mb的百分比降解速率（93.2％）。这些结果已经清楚地证明，N-ZnONCB催化剂可以应用于来自废水样品的MB的光催化降解。

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