Characterization and the Effect of Different Parameters on Photocatalytic Activity of Montmorillonite/TiO2 Nanocomposite under UVC Irradiation

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2024-02-20 DOI:10.3311/ppch.22065

Tam Thi Bang Dao, Loan Thi Thu Ha, Nhien Hon Le, Do Trung Nguyen, Truong Huu Nguyen, C. Ha-Thuc

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Abstract

This study aimed to modify montmorillonite (MMT) with titanium dioxide (TiO2) by wet stirring method combined with ultrasonic to form MMT/TiO2 nanocomposite and used as a photocatalyst in the removal of organic dye rhodamine B (RhB). The characteristics of the synthesized samples were analyzed by methods such as energy-dispersive X-ray spectroscopy (EDX), scanning electron microscope (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR) and UV-Vis diffuse reflectance spectra (UV-Vis DRS). The degradation of RhB was carried out for 210 min under UVC irradiation, and the decolorization efficiency of RhB was evaluated by UV-vis spectroscopy. The results show that the TiO2 anatase nanoparticles are randomly distributed on the surface or the space between the MMT sheets to form a house-of-card structure. After 210 min of exposure under a UVC light source, the decolorization efficiency reached 91.5% for the solution with pH = 6.8, photocatalyst content 0.1 g/L, initial concentration RhB 10 mg/L, and UVC power 15 W. Liquid chromatography–mass spectrometry (LCMS) identified the degradation intermediates that MMT/TiO2 successfully cleaved the chromophore structure and formed more minor broken-ring by-products. The influence of operating parameters on RhB removal efficiency, including solution pH, photocatalyst content, initial dye concentration, inorganic, and organic scavengers, was studied. In addition, the kinetic modeling study shows that the RhB photodegradation reaction is consistent with the Langmuir-Hinshelwood first-order kinetic model.

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蒙脱石/二氧化钛纳米复合材料在紫外线照射下的特性及不同参数对其光催化活性的影响

本研究旨在通过湿搅拌法结合超声波法对蒙脱石（MMT）与二氧化钛（TiO2）进行改性，形成MMT/TiO2纳米复合材料，并将其用作去除有机染料罗丹明B（RhB）的光催化剂。利用能量色散 X 射线光谱（EDX）、扫描电子显微镜（SEM）、透射电子显微镜（TEM）、X 射线衍射（XRD）、傅立叶变换红外光谱（FTIR）和紫外可见光漫反射光谱（UV-Vis DRS）等方法分析了合成样品的特性。在紫外光辐照下对 RhB 进行了 210 分钟的降解，并通过紫外可见光谱评估了 RhB 的脱色效率。结果表明，TiO2锐钛矿纳米粒子随机分布在 MMT 片材表面或片材之间的空隙中，形成了卡片式结构。液相色谱-质谱（LCMS）鉴定出的降解中间产物表明，MMT/TiO2 成功地裂解了发色团结构，并形成了更多微小的破环副产物。研究了溶液 pH 值、光催化剂含量、初始染料浓度、无机和有机清除剂等操作参数对 RhB 去除效率的影响。此外，动力学模型研究表明，RhB 光降解反应符合 Langmuir-Hinshelwood 一阶动力学模型。

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来源期刊

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.