Abstract

In this paper, montmorillonite/ZnO (MMT/ZnO) nanocomposite materials are prepared through chemical method with zinc nitrate and sodium alginate as precursors and stabilizers, respectively. Synthesized photocatalysts are used to degrade rhodamine B (RhB) in dye wastewater. The characteristics of photocatalysts in composition, surface morphology and structure are studied by using energy-dispersive X-ray spectroscopy (EDX), scanning electron microscopy (SEM), and X-ray diffraction (XRD). The intermediates after decomposition are identified by liquid chromatography–mass spectrometry (LC-MS). The results reveal that zinc oxide nanoparticles (ZnO_NP) with hexagonal wurtzite structure are successfully attached to montmorillonite layers according to the pillar-montmorillonite structure. The degradation efficiency of 10 ppm RhB in the presence of 0.1g/L MMT/ZnO under UVC irradiation for 210 min reaches 95.5%. The photocatalytic enhancement of MMT for ZnO is evaluated with different operational parameters such as excitation source, solution pH, catalyst content, initial solution concentration and inorganic scavengers. The mechanism of the photocatalytic degradation of RhB by MMT/ZnO is briefly discussed in this study.

中文翻译：

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越南蒙脱土负载 ZnO：制备、表征及光催化增强罗丹明 B 降解

摘要

本文分别以硝酸锌和海藻酸钠为前驱体和稳定剂，通过化学方法制备了蒙脱土/ZnO（MMT/ZnO）纳米复合材料。合成光催化剂用于降解染料废水中的罗丹明 B (RhB)。利用能量色散X射线光谱(EDX)、扫描电子显微镜(SEM)和X射线衍射(XRD)研究了光催化剂的组成、表面形貌和结构特征。分解后的中间体通过液相色谱-质谱法（LC-MS）进行鉴定。结果表明，氧化锌纳米颗粒（ZnO _NP）具有六方纤锌矿结构，根据柱-蒙脱石结构成功地附着在蒙脱石层上。在0.1g/L MMT/ZnO存在下，UVC照射210 min，10 ppm RhB的降解效率达到95.5%。使用不同的操作参数（例如激发源、溶液 pH 值、催化剂含量、初始溶液浓度和无机清除剂）评估 MMT 对 ZnO 的光催化增强作用。本研究简要讨论了 MMT/ZnO 光催化降解 RhB 的机理。