纳米二氧化硅改性二氧化钛对苯酚和Cr(VI)离子的同时光氧化和光还原

IF 0.7 4区工程技术 Q4 CHEMISTRY, APPLIED

Polish Journal of Chemical Technology Pub Date : 2022-12-01 DOI:10.2478/pjct-2022-0025

Daria Kądziołka, J. Grzechulska-Damszel, B. Schmidt

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引用次数: 0

摘要

摘要研究了在纳米二氧化硅改性二氧化钛存在下苯酚氧化和Cr（VI）还原的光催化过程。使用两种不同的光源测试了复合材料的活性。含有10%纳米二氧化硅的光催化剂表现出最高的活性。煅烧温度（200–800℃）显著决定了所获得材料对所用光源的敏感性。在辐照过程中，光催化剂交替地从反应混合物中吸附和解吸Cr（VI）离子。在单组分混合物中，使用在650℃下煅烧的材料，在UV-VIS照射3小时后，观察到苯酚的完全氧化。在Cr（VI）和苯酚的反应混合物中，在300℃下煅烧的光催化剂表现出最高的活性。苯酚浓度的降低与铬离子的减少成正比。所得二氧化钛-二氧化硅复合材料对苯酚具有氧化性能，对Cr（VI）离子具有还原性能。

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Simultaneous photooxidation and photoreduction of phenol and Cr(VI) ions using titania modified with nanosilica

Abstract The photocatalytic process of phenol oxidation and Cr(VI) reduction in the presence of nano-silica modified titania was carried out. The activity of composites was tested using two different light sources. The photocatalysts with 10% of nanosilica showed the highest activity. The calcination temperature (200–800 oC) significantly determined the sensitivity of the obtained materials to the light source used. Photocatalysts alternately adsorbed and desorbed Cr(VI) ions from the reaction mixture during irradiation. In the one-component mixture, complete oxidation of phenol was observed using material calcined at 650 oC, after 3 h of UV-VIS irradiation. In the reaction mixture of Cr(VI) and phenol, the highest activity was demonstrated by photocatalyst calcined at 300 oC. The concentration of phenol decreased in proportion to the decrease of chromium ions. The obtained titania-silica composites showed oxidizing properties towards phenol and reductive properties toward Cr(VI) ions.

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来源期刊

Polish Journal of Chemical Technology CHEMISTRY, APPLIED-ENGINEERING, CHEMICAL

CiteScore

1.70

自引率

10.00%

发文量

审稿时长

4.5 months

期刊介绍： Polish Journal of Chemical Technology is a peer-reviewed, international journal devoted to fundamental and applied chemistry, as well as chemical engineering and biotechnology research. It has a very broad scope but favors interdisciplinary research that bring chemical technology together with other disciplines. All authors receive very fast and comprehensive peer-review. Additionally, every published article is promoted to researchers working in the same field.