Covalent immobilization of laccase on citric acid functionalized micro-biochars derived from different feedstock and removal of diclofenac

文献类型： 外文期刊

第一作者： Lonappan, Linson

作者： Lonappan, Linson;Liu, Yuxue;Rouissi, Tarek;Pourcel, Florent;Brar, Satinder Kaur;Verma, Mausam;Liu, Yuxue;Surampalli, Rao Y.

作者机构：

关键词： Covalent immobilization; Biochar; Laccase; Citric acid, enzymes stability; Diclofenac

期刊名称：CHEMICAL ENGINEERING JOURNAL （ 影响因子：13.273； 五年影响因子：11.529 ）

ISSN： 1385-8947

年卷期： 2018 年 351 卷

页码：

收录情况： SCI

摘要： Immobilization of enzymes on the solid supports can improve the stability as well as catalytic properties of enzymes. In this study, biochar derived from various feedstocks were used as immobilization support considering biochars carbon negative as well as sustainable properties. Partially purified (concentrated) crude laccase was covalently immobilized onto pine wood (BC-PW), pig manure (BC-PM) and almond shell (BC-AS) micro-biochars using optimized 5% w/v glutaraldehyde. Moreover, citric acid pretreatment improved the laccase binding capacity of all the micro-biochars and the highest laccase binding of 40.2 +/- 1.8 U g(-1) was observed with BC-PM in comparison with raw BC-PM (34.1 +/- 1.1 U g(-1)). The enhanced binding of laccase on BC-PM over wood derived biochars was attributed to the higher surface area (46.1 m(2) g(-1)) of BC-PM. Moreover, feedstock selection as well as a method of production influenced the biochar physicochemical properties such as surface area and consequently, different biochars showed various laccase immobilization efficiencies. BC-PW showed better pH, thermal, storage, and operational stability, compared with BC-AS and BC-PM. While applying the laccase bound micro-biochar, complete removal was observed in 2 h under batch mode with 0.5 g of laccase bound BC-PM at an environmentally relevant concentration of 500 mu g L-1 in wastewater effluent. About 40% of the laccase activity was retained with all the laccase-bound micro-biochars after 5 cycles of diclofenac treatment.

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