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首页> 外文期刊>Clays and clay minerals >INFLUENCE OF Mn(III) AVAILABILITY ON THE PHASE TRANSFORMATION FROM LAYERED BUSERITE TO TUNNEL-STRUCTURED TODOROKITE
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INFLUENCE OF Mn(III) AVAILABILITY ON THE PHASE TRANSFORMATION FROM LAYERED BUSERITE TO TUNNEL-STRUCTURED TODOROKITE

机译：Mn（III）可用性对层状重晶石到隧道结构钙长石的相变的影响

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摘要

Todorokite is a common Mn oxide mineral in terrestrial and ocean-floor environments, and it is commonly synthesized from layered Na-buserite. Pyrophosphate, which is known to form strong complexes with Mn(III) at a pH range of 1-8, was added to a suspension of Na-buserite in order to sequester the available Mn(III) in Na-buserite. No Mn(III)-pyrophosphate complex was formed in solution at pH 10, and the treated Na-buserites were converted completely to todorokite. Significant transformation reductions were observed when Na-buserite was treated with pyrophosphate solution at pH 7. The presence of Mn(III) within the MnO_6 octahedral sheets of Na-buserite is critical for the transformation from layered buserite to tunnel-structured todorokite at atmospheric pressure. At lower pH, two effects are combined to reduce the amount of Mn(III) in the layers: (1) the complexing power of pyrophosphate is increased; and (2) the transformation from Na-buserite to H-birnessite, which is concomitant with the migration of Mn(III) from layers to the interlayer, and the partial disproportionation of Mn(III). The results showed that Mn(III) played a key role in the transformation of layered Na-buserite to tunnel-structured todorokite at atmospheric pressure.
机译：角铁锰矿在陆地和海底环境中是一种常见的锰氧化物矿物，通常由层状钠-堇青石合成。将焦磷酸盐（已知在1-8的pH范围内与Mn（III）形成强络合物）添加到钠-堇青石悬浮液中，以便将可用的锰（III）螯合在钠-堇青石中。在pH为10的溶液中没有形成Mn（III）-焦磷酸盐配合物，并且处理过的Na-重晶石完全转化为硅钙石。在pH值为7的情况下，通过焦磷酸盐溶液处理钠镁锌矿时，转化率显着降低。钠锰锌矿MnO_6八面体片状MnO_6八面体片中Mn（III）的存在对于从层状镁锌矿到隧道结构的钙钛矿的转化至关重要。 。在较低的pH值下，两种作用结合在一起以减少层中Mn（III）的量：（1）焦磷酸盐的络合力增加； （2）从钠镁铝榴石到H-水钠锰矿的转变，这与Mn（III）从层间迁移到中间层以及Mn（III）的部分歧化有关。结果表明，在大气压下，Mn（III）在层状钠堇青石向隧道结构钙钛矿的转化中起关键作用。

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