From functional groups to microbial communities: A portrait of adsorption hexavalent chromium by natural biofilm in the Manyar River, Gresik

Le résumé fourni par la source

Microbial biofilms play a crucial role in the adsorption and bioaccumulation of heavy metals in polluted aquatic environments, including toxic and persistent hexavalent chromium [Cr(VI)].However, the information on the structural characteristics and accumulation capacity of natural biofilms in industrial river ecosystems, particularly in Indonesia, remains limited.This study aimed to investigate the structural characteristics, microbial community composition, and Cr(VI) adsorption capacity of natural biofilms in the Manyar River, Gresik.Biofilm morphology and structure were analyzed using scanning electron microscopy (SEM), functional groups were identified using Fourier transform infrared spectroscopy (FTIR), and microbial communities were characterized through 16S rRNA metagenomic analysis.The results showed that biofilm development follows three main stages: adhesion, maturation, and dispersion.FTIR analysis indicated the presence of functional groups (C-X, C-O, C=C, and O-H) involved in Cr(VI) binding.The microbial community was dominated by Virgibacillus spp., Romboutsia spp., and Streptococcus spp., reflecting adaptation to polluted conditions.The distribution coefficient (Kd) ranged from 0.99-1.05,while the bioaccumulation factor (BAF) reached 99.44-106.81,indicating strong accumulation capacity.These findings highlight the potential of natural biofilms as effective agents for Cr(VI) bioremediation and biomonitoring in industrial river ecosystems.

Ce résumé expose les affirmations des auteurs. BNTIC ne l’interprète pas comme une validation indépendante des résultats.