Cr(VI) removal by Penicillium oxalicum SL2: Reduction with acidic metabolites and form transformation in the mycelium. (August 2020)

• Record Type: Journal Article
• Authors: Long, Bibo; Ye, Jien; Ye, Zhe; He, Junyu; Luo, Yating; Zhao, Yige; Shi, Jiyan
• Is Part Of: Chemosphere. Volume 253(2020)
• Publication Date: 2020-08
• Subjects: Fungus -- Cr(VI) reduction -- Oxalic acid -- Chromium speciation -- STXM -- XANES; Potato dextrose agar solid medium PDA -- Modified potato dextrose liquid medium PDL -- Spore suspension SS -- Fourier transform infrared spectroscopy FTIR -- Scanning transmission X-ray microscopy STXM -- X-ray absorption near edge structure XANES; Pollution -- Periodicals; Pollution -- Physiological effect -- Periodicals; Environmental sciences -- Periodicals; Atmospheric chemistry -- Periodicals; 551.511
• DOI: 10.1016/j.chemosphere.2020.126731
• Languages: English
• ISSNs: 0045-6535

Abstract

Abstract: Bioremediation of Cr(VI) contamination using microorganisms is a promising method for reducing its environmental risks. The objective of this study was to clarify Cr(VI) removal by Penicillium oxalicum SL2 in terms of indirect Cr(VI) reduction by metabolites, interaction sites, and form transformation of chromium. Strain SL2 could sequentially remove Cr(VI) in the bioreactor. Oxalic acid produced by the fungus contributed to Cr(VI) reduction. Scanning transmissiony X-ray microscop (STXM) analysis suggested strain SL2 could partly reduce Cr(VI) to Cr(III) in the cell. Amine, carboxyl, and phosphate groups were related to Cr(VI) removal. Chromium K-edge X-ray absorption near edge structure (XANES) analysis implied Cr(III)-Cys potentially acted as an intermediate for the formation of chromium oxalate complexes during the process of treatment. This study would support the application of strain SL2 in Cr(VI) bioremediation and expand knowledge on the interaction of chromium with fungus. Graphical abstract: Image 1 Highlights: Penicillium oxalicum SL2 sequentially removed Cr(VI) in the bioreactor. Oxalic acid produced by the fungus reduced Cr(VI) to chromium oxalate complexes. Amine, carb oxyl, and phosphate groups were involved in Cr(VI) removal. Cr(III)-Cys potentially acted as an intermediate for the formation of chromium oxalate complexes.