Preparation and Characterization of Nanostructured Titania-coated Silica Microsphere Membranes with Simultaneous Photo-catalytic and Separation Applications for Water Treatment

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2020-03-10 DOI:10.22068/IJMSE.17.1.35

V. T. Kajinebaf, M. Z. Khame-Forosh, H. Sarpoolaky

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引用次数: 1

Abstract

In this research, the nanostructured titania-coated silica microsphere (NTCSM) membrane consisting of titania-silica core-shell particles on α–alumina substrate was prepared by dip-coating method. The silica microspheres were synthesized by the Stöber method, and the nanostructured titania shell was obtained from a polymeric sol. Then, the prepared core-shell particles were deposited on alumina substrates. The samples were characterized by DLS, TG-DTA, XRD, FTIR and SEM. The photo-catalytic activity of the NTCSM membranes was evaluated using photo-degradation of methyl orange solution by UV–visible spectrophotometer. In addition, physical separation capability was investigated by filtration experiment based on methyl orange removal from aqueous solution using a membrane setup. The mean particle size of silica microspheres was determined to be around 650 nm, which increased to about 800nm by the deposition of titania nano-particles. After 60 min of UV-irradiation, the dye removal efficiency was determined to be 80% by the membrane. By coupling separation process with photo-catalytic technique, the removal efficiency was improved up to 97%. Thus, the NTCSM membranes showed simultaneous photo-degradation and separation capabilities for dye removal from water.

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纳米二氧化钛涂层二氧化硅微球膜的制备与表征同时用于水处理的光催化和分离应用

本研究采用浸涂法在α -氧化铝衬底上制备了由钛-二氧化硅核-壳粒子组成的纳米结构二氧化钛包覆二氧化硅微球(NTCSM)膜。通过Stöber方法合成二氧化硅微球，在聚合物溶胶中获得纳米结构的二氧化钛外壳，然后将所制备的核壳颗粒沉积在氧化铝基体上。采用DLS、TG-DTA、XRD、FTIR和SEM对样品进行了表征。采用紫外可见分光光度计对甲基橙溶液进行光降解，考察了NTCSM膜的光催化活性。此外，通过膜装置对甲基橙的物理分离性能进行了研究。二氧化硅微球的平均粒径约为650 nm，纳米二氧化钛的沉积使二氧化硅微球的平均粒径增加到800nm左右。经紫外线照射60 min后，膜对染料的去除率为80%。通过光催化耦合分离工艺，将去除率提高到97%以上。因此，NTCSM膜具有同时光降解和分离水中染料的能力。

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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.