Degradation of textile dyes using immobilized lignin peroxidase-like metalloporphines under mild experimental conditions

Chemistry Central Journal

Enrico Sanjust¹  Andrea C Rinaldi¹  Manuela Pintus¹  Antonio Rescigno¹  Paolo Zucca² 

[1]Dipartimento di Scienze Biomediche, Università di Cagliari, Cittadella Universitaria, 09042, Monserrato, CA, Italy

[2]Consorzio UNO (University of Oristano Consortium), Oristano, Italy

关键词: Porphyrin;    Porphine;    Lignin-peroxidase;    Dye;    Biomimetic;   

Others  :  787994
DOI  :  10.1186/1752-153X-6-161

 received in 2012-10-22, accepted in 2012-12-19,  发布年份 2012

【 摘 要 】

Background

Synthetic dyes represent a broad and heterogeneous class of durable pollutants, that are released in large amounts by the textile industry. The ability of two immobilized metalloporphines (structurally emulating the ligninolytic peroxidases) to bleach six chosen dyes (alizarin red S, phenosafranine, xylenol orange, methylene blue, methyl green, and methyl orange) was compared to enzymatic catalysts. To achieve a green and sustainable process, very mild conditions were chosen.

Results

IPS/MnTSPP was the most promising biomimetic catalyst as it was able to effectively and quickly bleach all tested dyes. Biomimetic catalysis was fully characterized: maximum activity was centered at neutral pH, in the absence of any organic solvent, using hydrogen peroxide as the oxidant. The immobilized metalloporphine kept a large part of its activity during multi-cycle use; however, well-known redox mediators were not able to increase its catalytic activity. IPS/MnTSPP was also more promising for use in industrial applications than its enzymatic counterparts (lignin peroxidase, laccase, manganese peroxidase, and horseradish peroxidase).

Conclusions

On the whole, the conditions were very mild (standard pressure, room temperature and neutral pH, using no organic solvents, and the most environmental-friendly oxidant) and a significant bleaching and partial mineralization of the dyes was achieved in approximately 1 h. Therefore, the process was consistent with large-scale applications. The biomimetic catalyst also had more promising features than the enzymatic catalysts.

【 授权许可】

   
2012 Zucca et al.; licensee Chemistry Central Ltd.

【 图 表 】

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