Effect mechanisms of hematite and goethite on naphthalene biodegradation, insight from electron transfer and microbial gene expression

IF 9.7 1区 环境科学与生态学 Q1 ENGINEERING, ENVIRONMENTAL
Shen Xiaofang, Su Xiaosi, Wan Yuyu, Xu Guigui, Zhang Qichen, Wang shinian, Lyu Hang, Dong Weihong
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Abstract

Polycyclic aromatic hydrocarbons (PAHs), particularly naphthalene (Nap), are persistent and hazardous pollutants, posing significant risks to both the environment and human health. Consequently, remediation strategies are urgently sought to mitigate Nap contamination, with bioremediation emerging as a promising approach. However, the efficacy of bioremediation, reliant on biodegradation, is hindered by various factors, prompting exploration into enhancing technologies. This study explored the potential of iron minerals, specifically hematite (α-Fe2O3) and goethite (α-FeO(OH)), in modulating Nap biodegradation from the perspectives of electron transfer and microbial gene expression. The results revealed that α-Fe2O3 promoted Nap biodegradation, while α-FeO(OH) inhibited it, and the promoting effect of α-Fe2O3 on the biodegradation of Nap increased with the increase in the α-Fe2O3 content, and the optimal content of α-Fe2O3 for promoting Nap biodegradation was approximately 7.5%, and the inhibitory effect of α-FeO(OH) on the biodegradation of Nap also increased with the increase in α-FeO(OH) content. Mechanistically, α-Fe2O3 facilitated microbial growth, accelerated electron transfer efficiency, enriched microbial diversity, and maintained enzyme activity, thus promoting Nap biodegradation. Conversely, α-FeO(OH) inhibited microbial growth, altered microbial communities, and reduced enzyme activity, leading to diminished Nap biodegradation. Therefore, the presence of α-Fe2O3 in the environment had a certain positive effect on the remediation of Nap contamination in groundwater. These findings underscore the complex interplay between iron minerals and microbial-mediated Nap biodegradation, offering insights into effective remediation strategies.

Abstract Image

多环芳烃(PAHs),尤其是萘 (Nap),是一种持久性有害污染物,对环境和人类健康都构成重大风险。因此,人们急需寻找补救策略来减轻萘污染,而生物修复是一种很有前景的方法。然而,生物修复依赖于生物降解,其功效受到各种因素的阻碍,这促使人们探索改进技术。本研究从电子传递和微生物基因表达的角度,探讨了铁矿物(特别是赤铁矿(α-Fe2O3)和鹅铁矿(α-FeO(OH)))在调节那不勒斯生物降解方面的潜力。结果表明,α-Fe2O3促进Nap的生物降解,而α-FeO(OH)则抑制Nap的生物降解,且α-Fe2O3对Nap生物降解的促进作用随α-Fe2O3含量的增加而增强,促进Nap生物降解的最佳α-Fe2O3含量约为7.5%,α-FeO(OH)对Nap生物降解的抑制作用也随α-FeO(OH)含量的增加而增强。从机理上讲,α-Fe2O3 有利于微生物生长,加快电子传递效率,丰富微生物多样性,保持酶活性,从而促进萘普的生物降解。相反,α-FeO(OH)会抑制微生物的生长,改变微生物群落,降低酶的活性,从而导致萘普的生物降解能力减弱。因此,α-Fe2O3 在环境中的存在对地下水中 Nap 污染的修复有一定的积极作用。这些发现强调了铁矿物与微生物介导的萘酚生物降解之间复杂的相互作用,为有效的修复策略提供了启示。
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来源期刊
Journal of Cleaner Production
Journal of Cleaner Production 环境科学-工程:环境
CiteScore
20.40
自引率
9.00%
发文量
4720
审稿时长
111 days
期刊介绍: The Journal of Cleaner Production is an international, transdisciplinary journal that addresses and discusses theoretical and practical Cleaner Production, Environmental, and Sustainability issues. It aims to help societies become more sustainable by focusing on the concept of 'Cleaner Production', which aims at preventing waste production and increasing efficiencies in energy, water, resources, and human capital use. The journal serves as a platform for corporations, governments, education institutions, regions, and societies to engage in discussions and research related to Cleaner Production, environmental, and sustainability practices.
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