Sorption of Co(II), Ni(II), and Zn(II) on Biogenic Manganese Oxides Produced by a Mn-Oxidizing Fungus, Strain KR21-2
Sorption of Co(II), Ni(II), and Zn(II) on Biogenic Manganese Oxides Produced by a Mn-Oxidizing Fungus, Strain KR21-2
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DOI：
10.1081/ese-200027021
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发表时间：
2004-12
期刊：
影响因子：
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通讯作者：
Y. Tani;M. Ohashi;N. Miyata;H. Seyama;K. Iwahori;M. Sōma
中科院分区：
文献类型：
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作者：
Y. Tani;M. Ohashi;N. Miyata;H. Seyama;K. Iwahori;M. Sōma
摘要 研究了锰氧化真菌菌株 KR21-2 对新鲜产生的生物锰氧化物的 Co(II)、Ni(II) 和 Zn(II) 吸附特性。根据单位重量和单位表面积计算，生物锰氧化物吸附金属离子的效率比合成锰氧化物 (γ-MnO2) 高约 10 倍。生物锰氧化物的吸附效率顺序为Co(II)>Zn(II)>Ni(II)，而合成锰氧化物的吸附效率顺序为Zn(II)>Co(II)>Ni(II)。这些吸附选择性通过吸附等温线和竞争吸附实验得到证实。两步萃取，使用 10 mM CuSO4 溶液处理可交换吸附离子，使用 10-20 mM 盐酸羟胺处理与可还原锰氧化物相结合的离子，结果显示 Co(II) 和 Ni(II) 在生物锰氧化物上的吸附具有较高的不可逆性，而 Zn(II) 吸附大部分是可逆的（Cu(II) 可交换）。然而，Co(II)、Ni(II) 和 Zn(II) 在合成 Mn 氧化物上的吸附大部分是可逆的。 Co(II) 和 Ni(II) 在生物锰氧化物上吸附的较高不可逆性可能部分解释了自然环境中这些金属离子在锰氧化物相中的较高积累。本研究获得的结果提出了将生物氧化锰的形成应用于处理被有毒金属离子污染的水的可能性。
Abstract The characteristics of Co(II), Ni(II), and Zn(II) sorption on freshly produced biogenic Mn oxides by a Mn-oxidizing fungus, strain KR21-2, were investigated. The biogenic Mn oxides showed about 10-fold higher efficiencies for sorbing the metal ions than a synthetic Mn oxide (γ-MnO2) on the basis of unit weight and unit surface area. The order of sorption efficiency on the biogenic Mn oxides was Co(II) > Zn(II) > Ni(II), while that on the synthetic Mn oxide was Zn(II) > Co(II) > Ni(II). These sorption selectivities were confirmed by both sorption isotherms and competitive sorption experiments. Two-step extraction, using 10 mM CuSO4 solution for exchangeable sorbed ions and 10–20 mM hydroxylamine hydrochloride for ions bound to reducible Mn oxide phase, showed higher irreversibility of Co(II) and Ni(II) sorption on the biogenic Mn oxides while Zn(II) sorption was mostly reversible (Cu(II)-exchangeable). Sorptions of Co(II), Ni(II), and Zn(II) on the synthetic Mn oxide were, however, found to be mostly reversible. Higher irreversibility of Co(II) and Ni(II) sorption on the biogenic Mn oxides may partly explain higher accumulation of these metal ions in Mn oxide phases in natural environments. The results obtained in this study raise the possibility to applying the biogenic Mn oxide formation to treatment of water contaminated with toxic metal ions.