Bio-mitigation of organic pollutants using horseradish peroxidase as a promising biocatalytic platform for environmental sustainability

High performance persistent organic pollutants removal using stabilized enzyme aggregates over amino functionalized magnetic biochar

Herein, a highly efficient and recyclable biocatalyst was developed using stabilized enzyme aggregates on amino-functionalized magnetic biochar for removing persistent organic pollutants from water. The biochar derived from biomass featured abundant hydroxyl functional groups, after functionalization with amino functional groups and magnetic nanoparticles, it was employed for laccase immobilization via enzyme electrostatic adsorption, precipitation and cross-linking in a favorable orientation. This immobilized enzyme aggregates exhibited enhanced pH tolerance, thermal and storage stability than free enzyme. Complete removal of 20 mg/L bisphenol A was achieved within 60 min via C-C bond cleavage and hydroxylation. Notably, the removal efficiency remained at approximately 90 % even after six cycles. Furthermore, this biocatalyst was also successfully applied to efficiently remove other various persistent organic pollutants and demonstrated applicability in real environmental water samples. This study highlights the substantial potential of enzyme-based biocatalysts, presenting a sustainable and efficient approach for water purification and biomass resource recovery.

Recent Progress on Peroxidase Modification and Application

Peroxdiase is one of the member of oxireductase super family, which has a broad substrate range and a variety of reaction types, including hydroxylation, epoxidation or halogenation of unactivated C-H bonds, and aromatic group or biophenol compounds. Here, we summarized the recently discovered enzymes with peroxidation activity, and focused on the special structures, sites, and corresponding strategies that can change the peroxidase catalytic activity, stability, and substrate range. The comparison of the structural differences between these natural enzymes and the mimic enzymes of binding nanomaterials and polymer materials is helpful to expand the application of peroxidase in industry. In addition, we also reviewed the catalytic application of peroxidase in the synthesis of important organic molecules and the degradation of pollutants.