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Enhanced Photocatalytic Activity of Biomimetic Synthesized Zinc Oxide Using Luffa Cylindrica as Biotemplate
Journal of Water Chemistry and Technology ( IF 0.6 ) Pub Date : 2021-11-19 , DOI: 10.3103/s1063455x21050076
Li-Ngee Ho 1 , Sin-Li Lee 2 , Soon-An Ong 3
Affiliation  

Abstract

Solar photocatalytic degradation of dye using zinc oxide (ZnO) is a sustainable and efficient wastewater treatment method which could mineralize the dye to carbon dioxide and water without creating secondary waste or sludge. Sunlight is a natural source of light that extends over both ultraviolet and visible range which could irradiate ZnO to initiate the photocatalytic reaction for degradation of dye. The dried Luffa cylindrica (LC), the sponge gourd is suitable to be applied as a biotemplate in synthesis as it is fibrous and porous that will lead to high surface area of the synthesized material. In this study, a biomimetic zinc oxide was synthesized by using LC as biotemplate via simple hydrothermal synthesis method. Both synthesized ZnO samples were characterized by using X-ray diffraction (XRD) and scanning electron microscope (SEM) to confirm their crystalline phase and morphology, respectively. Compared with the non-templated ZnO, the biotemplated ZnO possessed relatively high crystallinity with higher diffraction peaks that assigned to the hexagonal wurtzite structure. Significant difference could be observed between the morphology of the ZnO synthesized without biotemplate and the ZnO synthesized with LC. It was found that the Luffa-templated ZnO inherited the structure of LC which the spherical nanoparticles connected continuously to each other in a dendritic-like morphology, while relatively large micron-sized particles were obtained in the ZnO synthesized without biotemplate. Photocatalytic activity of the synthesized ZnO was evaluated by degradation of Reactive Green 19 (RG19) under natural solar light irradiation. Results showed that enhanced photocatalytic degradation of RG19 at 65.8% was achieved in Luffa-templated ZnO compared with that of the non-templated ZnO which was only 40.8%. This indicated that the Luffa-templated ZnO possessed improved physical properties which could enhance its photocatalytic activity.



中文翻译:

以丝瓜为生物模板增强仿生合成氧化锌的光催化活性

摘要

使用氧化锌 (ZnO) 的太阳能光催化降解染料是一种可持续且高效的废水处理方法,可以将染料矿化为二氧化碳和水,而不会产生二次废物或污泥。太阳光是一种天然光源,可在紫外和可见光范围内照射,可以照射 ZnO 以引发光催化反应以降解染料。干丝瓜(LC),丝瓜适合用作合成中的生物模板,因为它是纤维状和多孔的,会导致合成材料的高表面积。本研究以液相色谱为生物模板,通过简单的水热合成法合成了一种仿生氧化锌。通过使用 X 射线衍射 (XRD) 和扫描电子显微镜 (SEM) 分别对两种合成的 ZnO 样品进行表征,以确认它们的晶相和形貌。与非模板化的 ZnO 相比,生物模板化的 ZnO 具有相对较高的结晶度和较高的衍射峰,这些峰属于六方纤锌矿结构。在没有生物模板的情况下合成的 ZnO 和用 LC 合成的 ZnO 的形态之间可以观察到显着差异。发现丝瓜模板化的 ZnO 继承了 LC 的结构,其中球形纳米粒子以树枝状形态相互连续连接,而在没有生物模板的情况下合成的 ZnO 中获得了相对较大的微米级粒子。通过在自然太阳光照射下降解活性绿 19 (RG19) 来评估合成的 ZnO 的光催化活性。结果表明,与非模板化 ZnO 相比,丝瓜模板化 ZnO中 RG19 的光催化降解率提高了 65.8%,后者仅为 40.8%。这表明丝瓜模板化的 ZnO 具有改进的物理性质,可以增强其光催化活性。

更新日期:2021-11-20
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