Strain-boosted hyperoxic graphene oxide efficiently loading and improving performances of microcystinase

Harmful Microcystis blooms (HMBs) and microcystins (MCs) that are produced by Microcystis seriously threaten water ecosystems and human health. This study demonstrates an eco-friendly strategy for simultaneous removal of MCs and HMBs by adopting unique hyperoxic graphene oxides (HGOs) as carrier and pure microcystinase A (PMIrA) as connecting bridge to form stable HGOs@MIrA composite. After oxitiation, HGOs yield inherent structural strain effects for boosting the immobilization of MIrA by material characterization and density functional theory calculations. HGO(5) exhibits higher loading capacities for crude MIrA (1,559 mg.g(-1)) and pure MIrA (1,659 mg.g(-1)). Moreover, the performances of HGO(5)@MIrA composite, including the capability of removing MCs and HMBs, the ecological and human safety compared to MIrA or HGO(5) treatment alone, have been studied. These results indicate that HGO(5) can be used as a promising candidate material to effectively improve the application potential of MIrA in the simultaneous removal of MCs and HMBs.

Automated summary

This study proposes an eco-friendly strategy for simultaneous removal of microcystins and harmful Microcystis blooms by using hyperoxic graphene oxides as carrier and pure microcystinase A as connecting bridge, forming a stable HGOs@MIrA composite. The results show that HGO(5) exhibits higher loading capacities and can effectively improve the application potential of MIrA in the removal of microcystins and harmful Microcystis blooms.