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在腐殖酸存在的情况下，含 Fe(III)的粘土矿物的微生物还原。

Microbial reduction of Fe(III)-bearing clay minerals in the presence of humic acids.

机构信息

Key Laboratory of Industrial Ecology and Environmental Engineering, Ministry of Education, School of Environmental Science and Technology, Dalian University of Technology, Dalian, 116024, China.

Chemistry Analysis &Research Center, Faculty of Chemical, Environmental &Biological Science and Technology, Dalian University of Technology, Dalian, 116024, China.

出版信息

Sci Rep. 2017 Mar 30;7:45354. doi: 10.1038/srep45354.

DOI:10.1038/srep45354
PMID:28358048
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC5371790/
Abstract

Both Fe(III)-bearing clay minerals and humic acids (HAs) are abundant in the soils and sediments. Previous studies have shown that bioreduction of structural Fe(III) in clay minerals could be accelerated by adding anthraquinone compound as a redox-active surrogate of HAs. However, a quinoid analogue could not reflect the adsorption and complexation properties of HA, and little is known about the effects of real HAs at environmental concentration on bioreduction of clay minerals. Here, it was shown that 10-200 mg l of natural or artificially synthesized HAs could effectively stimulate the bioreduction rate and extent of Fe(III) in both iron-rich nontronite NAu-2 and iron-deficient montmorillonite SWy-2. After adsorption to NAu-2, electron-transfer activities of different HA fractions were compared. Additionally, Fe(II) complexation by HAs also contributed to improvement of clay-Fe(III) bioreduction. Spectrosopic and morphological analyses suggested that HA addition accelerated the transformation of NAu-2 to illite, silica and siderite after reductive dissolution.

摘要

土壤和沉积物中富含含 Fe(III)的粘土矿物和腐殖酸 (HA)。先前的研究表明，添加蒽醌化合物作为 HA 的氧化还原替代物可以加速粘土矿物中结构 Fe(III)的生物还原。然而，醌型类似物不能反映 HA 的吸附和络合特性，并且对于环境浓度下的实际 HA 对粘土矿物生物还原的影响知之甚少。在这里，研究表明，10-200 mg l 的天然或人工合成 HA 可以有效刺激富含铁的非绿脱石 NAu-2 和缺铁蒙脱石 SWy-2 中 Fe(III)的生物还原速率和程度。在吸附到 NAu-2 后，比较了不同 HA 级分的电子转移活性。此外，HA 对 Fe(II)的络合作用也有助于提高粘土-Fe(III)的生物还原。光谱和形态分析表明，HA 的添加加速了还原溶解后 NAu-2 向伊利石、二氧化硅和菱铁矿的转化。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1b2b/5371790/d1b472fb6857/srep45354-f6.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1b2b/5371790/fbd4c3bb80f1/srep45354-f1.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1b2b/5371790/429fc72200f6/srep45354-f2.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1b2b/5371790/1368a96f2f0d/srep45354-f3.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1b2b/5371790/7d684ab1bdc2/srep45354-f4.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1b2b/5371790/460625e4859f/srep45354-f5.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1b2b/5371790/d1b472fb6857/srep45354-f6.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1b2b/5371790/fbd4c3bb80f1/srep45354-f1.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1b2b/5371790/429fc72200f6/srep45354-f2.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1b2b/5371790/1368a96f2f0d/srep45354-f3.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1b2b/5371790/7d684ab1bdc2/srep45354-f4.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1b2b/5371790/460625e4859f/srep45354-f5.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1b2b/5371790/d1b472fb6857/srep45354-f6.jpg

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