科研之友
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摘要
Biosynthesized mackinawite nanomaterials have good removal properties for heavy metals，which are correlated with the ratio of sulfur to iron in the material. Still，the understanding of the source of sulfur and iron in the materials-the influence of the ratio of iron and sulfur in the bioprocess electron acceptor on the synthesis of FeS NPs and their removal effect of heavy metals is relatively low. In this study，FeS was synthesized using Shewanella oneidensis to explore the effect of different sulfur-iron ratios of the biosynthesis process on the FeS NPs and their removal effect on cadmium. Results indicate that as the sulfur-to-iron ratio decreases from 1∶0.1 to 1∶2，the total release of biologically sourced S2- increases from 1 mmol·L-1 to 4.2 mmol·L-1，while the synthesis rate of FeS NPs slows down. The structural composition changes of FeS NPs synthesized at different sulfur-to-iron ratios were confirmed by solid-phase characterization，revealing a surface enrichment of carbon-oxygen functional groups. FeS NPs（Fe-2，Fe-3，Fe-4）with sulfur-to-iron ratios higher than 1.4 exhibited complete removal of 100 mg·L-1 Cd2+. Specifically，FeS NPs synthesized with a sulfur-to-iron ratio of 1∶0.5 （FeS-3）demonstrated a maximum Cd2+ adsorption capacity of 396.8 mg · g-1. Further desorption experiments revealed that FeS-3 exhibited a 44% maximum exchange precipitation ratio，enabling stable removal of high-concentration cadmium-contaminated wastewater. ? 2024 Science Press.
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