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Preferential Elimination of Ba2+ through Irreversible Biogenic Manganese Oxide Sequestration
Minerals ( IF 2.2 ) Pub Date : 2021-01-07 , DOI: 10.3390/min11010053
Yukinori Tani , Satomi Kakinuma , Jianing Chang , Kazuya Tanaka , Naoyuki Miyata

Biogenic manganese oxides (BMOs) formed in a culture of the Mn(II)-oxidizing fungus Acremonium strictum strain KR21-2 are known to retain enzymatic Mn(II) oxidation activity. Consequently, these are increasingly attracting attention as a substrate for eliminating toxic elements from contaminated wastewaters. In this study, we examined the Ba2+ sequestration potential of enzymatically active BMOs with and without exogenous Mn2+. The BMOs readily oxidized exogenous Mn2+ to produce another BMO phase, and subsequently sequestered Ba2+ at a pH of 7.0, with irreversible Ba2+ sequestration as the dominant pathway. Extended X-ray absorption fine structure spectroscopy and X-ray diffraction analyses demonstrated alteration from turbostratic to tightly stacked birnessite through possible Ba2+ incorporation into the interlayer. The irreversible sequestration of Sr2+, Ca2+, and Mg2+ was insignificant, and the turbostratic birnessite structure was preserved. Results from competitive sequestration experiments revealed that the BMOs favored Ba2+ over Sr2+, Ca2+, and Mg2+. These results explain the preferential accumulation of Ba2+ in natural Mn oxide phases produced by microbes under circumneutral environmental conditions. These findings highlight the potential for applying enzymatically active BMOs for eliminating Ba2+ from contaminated wastewaters.

中文翻译:

通过不可逆生物氧化锰螯合优先消除Ba2 +

已知在氧化Mn(II)的真菌(Acremoniumstrictum)菌株KR21-2的培养物中形成的生物锰氧化物(BMO)保留了酶促Mn(II)的氧化活性。因此,这些作为从受污染的废水中消除有毒元素的基质越来越受到关注。在这项研究中,我们检查了有和没有外源Mn 2+的酶活性BMO的Ba 2+螯合潜力。BMO容易氧化外源Mn 2+以产生另一个BMO相,随后在pH值为7.0的条件下与不可逆Ba 2+螯合Ba 2+隔离是主要途径。扩展的X射线吸收精细结构光谱学和X射线衍射分析表明,可能通过将Ba 2+掺入中间层,从透水层变为紧密堆积的水钠锰矿。Sr 2 +,Ca 2+和Mg 2+的不可逆螯合作用微不足道,并且保留了层状水钠锰矿结构。竞争性螯合实验的结果表明,BMO比Ba 2+胜于Sr 2 +,Ca 2+和Mg 2+。这些结果说明了Ba 2+的优先积累在周围环境条件下由微生物产生的天然锰氧化物相中。这些发现凸显了应用酶活性BMO消除污染废水中Ba 2+的潜力。
更新日期:2021-01-07
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