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Bilirubin oxidase-based silica macrocellular robust catalyst for on line dyes degradation. | LitMetric

Bilirubin oxidase-based silica macrocellular robust catalyst for on line dyes degradation.

Enzyme Microb Technol

CNRS, Univ. Bordeaux, CRPP, UMR5031, 115 Avenue Albert Schweitzer, F-33600, Pessac, France. Electronic address:

Published: January 2019

AI Article Synopsis

Article Abstract

We present a new heterogeneous biocatalyst based on the grafting of Bilirubin Oxidase from Bacillus pumilus into macrocellular Si(HIPE) materials dedicated to water treatment. Due to the host intrinsic high porosity and monolithic character, on-line catalytic process is reached. We thus used this biocatalyst toward uni-axial flux decolorizations of Congo Red and Remazol Brilliant Blue (RBBR) at two different pH (4 and 8.2), both in presence or absence of redox mediator. In absence of redox mediators, 40% decolorization efficiency was reached within 24 h at pH 4 for Congo Red and 80% for RBBR at pH 8.2 in 24 h. In presence of 10μM ABTS, it respectively attained 100% efficiency after 2h and 12h. We have also demonstrated that non-toxic species were generated upon dyes decolorization. These results show that unlike laccases, this new biocatalyst exhibits excellent decolorization properties over a wide range of pH. Beyond, this enzymatic-based heterogeneous catalyst can be reused during two months being simply stored at room temperature while maintaining its decolorization efficiency. This study shows that this biocatalyst is a promising and robust candidate toward wastewater treatments, both in acidic and alkaline conditions where in the latter efficient decolorization strategies were still missing.

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Source
http://dx.doi.org/10.1016/j.enzmictec.2018.10.004DOI Listing

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