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首页> 外文期刊>Advances in Environmental Technology >Preparation and characterizations of CuO doped ZnO nano-structure for the photocatalytic degradation of 4-chlorophenol under visible light
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Preparation and characterizations of CuO doped ZnO nano-structure for the photocatalytic degradation of 4-chlorophenol under visible light

机译：CuO掺杂ZnO纳米结构在可见光下光催化降解4-氯苯酚的制备与表征

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In the present investigation, a ZnO nanostructure was synthesized by means of precipitation and sonochemical methods. The X-ray diffraction (XRD) pattern indicated that the wurtzite structure of ZnO had a hexagonal symmetry and there was no impurity. The average ZnO particles crystallite size was calculated at about 41 nm. The SEM and TEM images revealed nanostructure ZnO particles with a cauliflower-like and rod morphology with dimensions of 85, 79 and 117 nm. In order to investigate the increment of ZnO photoactivity under visible light, the CuO doped ZnO nanostructures were fabricated by a wet impregnation method using copper oxide as the copper source and ZnO as the precursor. The XRD analysis confirmed that the CuO phase was present in the as-prepared sample and the average size of nano crystalline decreased to about 36 nm. The DRS spectra indicated the extended absorption of CuO-ZnO to the visible range as a result of band gap reduction to 2.9 eV (in comparison of 3.2 eV in ZnO). In order to investigate the photocatalytic activity of the synthesized photocatalyst, the degradation of 4-Chlorophenol under visible light was performed. Sixteen experiments using full factorial were executed by adjusting four parameters (amount of catalyst, initial concentration of 4-Chlorophenol, pH, and time of irradiation). An empirical expression was proposed and successfully used to model the photocatalytic process with a high correlation, and an optimal experimental region was also obtained. According to the developed model for degradation and the subsequent ANOVA test using Design Expert software, the time of irradiation with a 46.57% effect played the most important role in the photocatalytic activity, while the influences of parameters on each other were negligible. Optimal experimental conditions for 4-Chlorophenol concentration (0.01 g/L) were found at an initial pH =8 and a catalyst loading of 0.07 g/L. The results indicated that CuO-ZnO can remove 95% of 4-chlorophenol from water under optimal conditions.
机译：在本研究中，通过沉淀和声化学方法合成了ZnO纳米结构。 X射线衍射（XRD）图谱表明ZnO的纤锌矿结构具有六边形对称性并且没有杂质。计算出平均ZnO颗粒微晶尺寸为约41nm。 SEM和TEM图像显示出具有花椰菜状和棒状形态的纳米结构ZnO颗粒，尺寸分别为85、79和117 nm。为了研究可见光下ZnO光活性的增加，采用湿浸渍法，以氧化铜为铜源，ZnO为前驱体，制备了CuO掺杂的ZnO纳米结构。 XRD分析证实了所制备的样品中存在CuO相，并且纳米晶体的平均尺寸减小至约36nm。 DRS光谱表明，由于带隙减小至2.9 eV（相比之下，ZnO中为3.2 eV），CuO-ZnO的吸收扩展到可见光范围。为了研究合成的光催化剂的光催化活性，在可见光下进行了4-氯苯酚的降解。通过调整四个参数（催化剂量，4-氯苯酚的初始浓度，pH和照射时间），执行了使用全因子的16个实验。提出了经验表达式，并成功地将其用于高相关度的光催化过程建模，并获得了最佳的实验区域。根据开发的降解模型和随后使用Design Expert软件进行的ANOVA测试，具有46.57％效应的辐照时间在光催化活性中起着最重要的作用，而各个参数之间的影响则可以忽略不计。发现在初始pH = 8且催化剂负载量为0.07 g / L时4-氯苯酚浓度（0.01 g / L）的最佳实验条件。结果表明，在最佳条件下，CuO-ZnO可以从水中去除95％的4-氯苯酚。

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