TiO₂-soybean peroxidase composite materials as a new photocatalytic system

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• 作者：Paola Calza ; Paola Avetta ; Giuliana Rubulotta ; Marco Sangermano ; Enzo Laurenti
• 关键词：Titanium dioxide ; Soybean peroxidase ; UV-curing ; Trichlorophenol
• 刊名：Chemical Engineering Journal
• 出版年：1 March, 2014
• 年：2014
• 卷：239
• 期：Complete
• 页码：87-92
• 全文大小：971 K

文摘

In the present work, we prepared a new photoactive system, able to remove water pollutants by dispersion of TiO₂ and the enzyme soybean peroxidase (SBP) within a polymer matrix. UV-cured acrylic polymeric films were prepared, in the presence of TiO₂ and SBP. The choice of SBP was based on its ability to catalyze the oxidation of several substrates, coupled with a strong stability and thermal resistance. Since SBP requires H₂O₂ as cosubstrate, we verified the TiO₂ ability to produce, under irradiation, enough H₂O₂ to activate SBP, both in aqueous suspension and when dispersed in the polymeric film. The experimental data support the possibility of using only the H₂O₂ produced by TiO₂, thus allowing to devise a system able to be activated only by irradiation and self-renew, without the addition of reagents from the outside.

The efficiency of the TiO₂/SBP system, both dispersed in film and in aqueous suspension, were tested on 2,4,6-trichlorophenol. It was observed that TiO₂ and SBP act synergistically, leading to an increase in the rate of removal of the model molecule. In addition, the system exhibits a certain selectivity on the intermediates products, above all hindering the formation of chloroderivatives, which is particularly interesting for future application in the field of environmental purification.