Mesoporous silica based catalysts for the oxidation of azodyes in waste water
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- 作者：T. V. Kon’kova ; M. G. Gordienko ; M. B. Alekhina ; N. V. Men’shutina…
- 刊名：Catalysis in Industry
- 出版年：2016
- 出版时间：April 2016
- 年：2016
- 卷：8
- 期：2
- 页码：128-133
- 全文大小：273 KB
- 刊物类别：Chemistry and Materials Science
- 刊物主题：Chemistry
Catalysis
Russian Library of Science - 出版者：MAIK Nauka/Interperiodica distributed exclusively by Springer Science+Business Media LLC.
- ISSN：2070-0555
- 卷排序：8
文摘
Iron-containing catalysts supported on mesoporous silica samples that differ in the methods of their preparation (commercial KSS silica gel, MSM-41 mesoporous silicalite, and silica gels obtained under laboratory conditions by means of spray drying and drying in supercritical СО2) are synthesized. Their porous structure is studied via low-temperature nitrogen adsorption. Their catalytic activity and stability in the oxidation of carmoisine (an anionic dye) with a 3% hydrogen peroxide solution in water at 60°C and рН 3 are compared. The initial carmoisine and catalyst concentrations in solution are 20 mg/L and 3 g/L, respectively, and the molar Н2О2/carmoisine ratio is 459/1. The KSS-based catalyst demonstrates the highest activity and stability with respect to the outwashing of an active component into a solution: the conversion of carmoisine on this catalyst is as high as 99% for 30 min, while the concentration of iron ions in solution (0.27 mg/L) does not exceed the maximum allowable concentration. After the support is preimpregnated with aluminum, the degree of iron outwashing into a solution is more than halved. The synthesized catalysts are of interest with regard to the purification of waste water containing organic admixtures.Keywordsmesoporous silicaFenton heterogeneous catalystsoxidative destruction of dyeswaste water