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Hence, a study on how natural minerals could affect NRFO is warranted. This study examined the impact of hematite on NRFO by <jats:italic>Acidovorax<\/jats:italic> sp. BoFeN1 with different electron donors (acetate and Fe(II), acetate alone, and Fe(II) alone) and with nitrate as an electron acceptor. When acetate and Fe(II) were used as the electron donors, the amount of Fe(II) oxidation and nitrate reduction was enhanced in the presence of hematite, whereas no promotion was observed when only acetate was added as an electron donor. Under the conditions with only Fe(II) added as an electron donor, the level of Fe(II) oxidation was increased from 3.07\u2009\u00b1\u20090.06 to 3.92\u2009\u00b1\u20090.02\u2009mM in the presence of hematite and nitrate reduction was enhanced. This suggests that hematite promotes microbial nitrate reduction by accelerating the biological oxidation of Fe(II). The main secondary minerals were goethite and lepidocrocite. After adding hematite, the assemblage of iron minerals on the cell surface decreased, and the cell crusts became thinner, indicating that hematite effectively mitigated cell encrustation. Furthermore, hematite accelerated the chemical oxidation of Fe(II) by nitrite. Hence, hematite can promote the NRFO of <jats:italic>Acidovorax<\/jats:italic> sp. BoFeN1 via two possible pathways: (i) hematite acts as nucleation sites to mitigate cell encrustation; (ii) hematite catalyzes the biological and chemical oxidation of Fe(II) through the mineral catalysis effects. This study highlights the importance of existing iron minerals on NRFO and sheds light on the survival strategy of NRFO bacteria in anoxic subsurface environments.<\/jats:p>","DOI":"10.1111\/gbi.12510","type":"journal-article","created":{"date-parts":[[2022,7,13]],"date-time":"2022-07-13T14:45:47Z","timestamp":1657723547000},"page":"810-822","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":29,"title":["Hematite\u2010promoted nitrate\u2010reducing Fe(<scp>II<\/scp>) oxidation by <i>Acidovorax<\/i> sp. strain <scp>BoFeN1<\/scp>: Roles of mineral catalysis and cell encrustation"],"prefix":"10.1111","volume":"20","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-6806-4105","authenticated-orcid":false,"given":"Kuan","family":"Cheng","sequence":"first","affiliation":[{"name":"Guangzhou Institute of Geochemistry Chinese Academy of Sciences  Guangzhou P. R. China"},{"name":"National\u2010Regional Joint Engineering Research Center for Soil Pollution Control and Remediation in South China, Guangdong Key Laboratory of Integrated Agro\u2010environmental Pollution Control and Management, Institute of Eco\u2010environmental and Soil Sciences Guangdong Academy of Sciences  Guangzhou P. R. China"},{"name":"University of Chinese Academy of Sciences  Beijing P. R. China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2114-4364","authenticated-orcid":false,"given":"Han","family":"Li","sequence":"additional","affiliation":[{"name":"National\u2010Regional Joint Engineering Research Center for Soil Pollution Control and Remediation in South China, Guangdong Key Laboratory of Integrated Agro\u2010environmental Pollution Control and Management, Institute of Eco\u2010environmental and Soil Sciences Guangdong Academy of Sciences  Guangzhou P. R. 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