Abstract
The graphene oxide (GO) reduction by microorganisms has garnered considerable interest, yet the specific mechanisms underlying the bacteria secretion of reducing substances for GO reduction remain unclear. This study aims to learn that bacterial extracellular components can reduce graphene oxide through direct (contacting GO) and indirect (not contacting GO) reduction experiments. The subsequent investigation focused on identifying the specific substances secreted by bacteria capable of GO reduction. The results of non-targeted metabolomics revealed differential expression of cacid (L-AA) demonstrates a significant up-regulation. The further experiment involved the supplementation of L-AA in the reduction system of Lysinibacillus sp. with GO, demonstrating enhanced reduction efficacy, with the ID/IG ratio of reduced graphene oxide (rGO) increasing to 1.073 after 4 d of reduction with 0.5 g L−1 L-AA. Therefore, the mediation of GO reduction by L-AA secreted by Lysinibacillus sp. is proposed as a viable mechanism, offering novel insights into microbial GO reduction.
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