Effects of Cr(VI)-reducing bacteria on the behaviour of Cr(VI) adsorption by goethite and haematite: speciation and dist
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SOILS, SEC 5 • SOIL AND LANDSCAPE ECOLOGY • RESEARCH ARTICLE
Effects of Cr(VI)-reducing bacteria on the behaviour of Cr(VI) adsorption by goethite and haematite: speciation and distribution Chunyong Wang 1,2 & Rui Wu 1,2 & Jianbo Guo 1,2 & Yanshan Cui 1,2 Received: 13 February 2020 / Accepted: 28 May 2020 # Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract Propose In the soil environment, the existence of Cr(VI)-reducing microorganisms might affect the adsorption, desorption and reduction of Cr(VI) adsorbed on soil minerals (such as Fe oxides). The behaviour of Cr(VI)-reducing microorganisms might affect the adsorption and reduction of Cr(VI) by soil minerals. Materials and methods Goethite and haematite with saturated adsorbed Cr(VI) were incubated with Microbacterium sp. QH-2, a Cr(VI)-reducing bacteria. Scanning electronic microscopy (SEM) and X-ray diffraction (XRD) were used to detect the changes in goethite and haematite. X-ray absorption near-edge structure (XANES) was performed to detect the changes in Cr(III) and Cr(VI) on goethite and haematite. Results and discussion Strain QH-2 adhered to the surfaces of goethite and haematite. No morphological changes in goethite and haematite were detected after incubation. No secondary Fe minerals formed. Cr(III) was the dominant species of Cr on goethite and haematite (78.5% for goethite and 96.7% for haematite) after incubation. Furthermore, the reduction rate of Cr(VI) by strain QH-2 in the liquid phase was faster than that of Cr(VI) adsorbed on goethite and haematite. Conclusions The existence of strain QH-2 could promote the adsorption of Cr by goethite and haematite. Strain QH-2 could affect the morphological distribution and transformation of Cr in Fe oxides such as goethite and haematite. Keywords Goethite . Haematite . Cr(VI)-reducing bacteria . Cr speciation . Cr distribution
1 Introduction Responsible editor: Hang-Wei Hu Electronic supplementary material The online version of this article (https://doi.org/10.1007/s11368-020-02686-0) contains supplementary material, which is available to authorized users. * Yanshan Cui [email protected] Chunyong Wang [email protected] Rui Wu [email protected] Jianbo Guo [email protected] 1
College of Resources and Environment, University of Chinese Academy of Sciences, Huaibei Village 380, Huaibei Town, Huaibei District, Beijing 101408, China
2
Research Center for Eco-environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
Chromium (Cr) has attracted much environmental concern and become an environmental issue worldwide due to its pollution of the environment, especially in soils (Fernández et al. 2018; Hou et al. 2020). Trivalent Cr (Cr(III)) and hexavalent Cr (Cr(VI)) are the most stable oxidation states of Cr that exist in the soil environment (Kotaś and Stasicka 2000; Raptis et al. 2018). Compared with Cr(III), Cr(VI) is more toxic and migratory. Cr(VI) contamination in soils principally comes from the irresponsible disposal and accidental spillage of chromium-conta
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