The Influence of Hibiscus tiliaceus Leaf Extract as Capping Agent on the Zinc Oxide Properties and its Photo-simultaneous Performance

Riki Subagyo, Elfirza Zai̇n, Siyam Marti̇na, Saepurahman Saepurahman, Y. Kusumawati
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Abstract

Polyol method, as one alternative in ZnO synthetic methods, have been developed and generated a nano-ZnO. However, the produced nano-ZnO is unstable due to its small particle size. To overcome the problems, we added Hibiscus tiliaceus leaves’ extract during the ZnO (EZnO) synthesis to change the water content and hydrolysis ratio of Zn2+/water. The addition of H. tiliaceus extract resulted in a shifting peak at (101) plane compared to ZnO synthesized without extract addition (WZnO). The use of H. tiliaceus extracts leads to the formation of large and non-uniform particles compared to the one prepared without the extract, which is in agreement with the intensity of diffraction pattern. The use of H. tiliaceus extracts shifted the bandgap energy to visible range. The performance of WZnO and EZnO samples was tested for simultaneous photo-oxidation of methylene blue and photo-reduction of Cr(VI) ions under UV-C irradiation. The EZnO is equally active as WZnO for Cr(VI) ion photo-reduction but less active for photo-oxidation of methylene blue. The presence of retained organic material in EZnO is plausibly affected by the adsorption and subsequent photo-oxidation of the bulky MB leading to a lower photo-oxidation performance. However, the activity of EZnO was a little bit lower than that of WZnO, revealing that the synergistic of particle size and band gap energy is a crucial factor in photo-removal process. In addition, the presence of phenolic compounds on the EZnO surface might change the nature properties of WZnO, which influence its performance.
木槿叶提取物作为封端剂对氧化锌特性及其光电同步性能的影响
多元醇法作为氧化锌合成方法中的一种替代方法,已经开发并生成了纳米氧化锌。然而,生成的纳米氧化锌由于粒径较小而不稳定。为了克服这些问题,我们在氧化锌(EZnO)合成过程中加入了木槿叶提取物,以改变含水量和 Zn2+/ 水的水解比例。与未添加提取物合成的氧化锌(WZnO)相比,添加椴树叶提取物后,在(101)平面处的峰值发生了移动。与未添加提取物的 ZnO 相比,添加 H. tiliaceus 提取物会导致形成大而不均匀的颗粒,这与衍射图样的强度一致。H. tiliaceus 提取物的使用将带隙能量转移到了可见光范围。测试了 WZnO 和 EZnO 样品在 UV-C 照射下同时光氧化亚甲基蓝和光还原 Cr(VI) 离子的性能。EZnO 与 WZnO 对六价铬离子的光还原活性相同,但对亚甲蓝的光氧化活性较低。EZnO 中保留的有机物可能会受到大块甲基溴的吸附和随后的光氧化作用的影响,从而导致光氧化性能降低。然而,EZnO 的活性略低于 WZnO,这表明粒度和带隙能的协同作用是光去除过程中的关键因素。此外,EZnO 表面酚类化合物的存在可能会改变 WZnO 的性质,从而影响其性能。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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