State of Cu~(2+) adsorbed by montmorillonite
State of Cu~(2+) adsorbed by montmorillonite
复制标题
DOI：
--
复制
发表时间：
2000
期刊：
影响因子：
--
通讯作者：
He Hong-pin
中科院分区：
文献类型：
--
作者：
He Hong-pin
吸附Cu 2+的蒙脱石的XRD结果表明，蒙脱石的d（001）值为1。523 μ m，这与d（001）为1的原始样品不同。479 μ m，说明蒙脱石的阳离子间已被水合铜离子取代。在蒙脱石吸附Cu~（2+）的EPR谱中，有三个与Cu~（2+）有关的信号。它们分别位于g = 2处。07，g = 2。14这是细线和g ca。2. 2比2 7、这是一条很好的线。提出了Cu~（2+）存在三种不同的结构状态。这些蒙脱石的热产物的EPR研究表明，g = 2。14信号与蒙脱石层间存在的水合铜离子有关，g = 2。07信号与Cu~（2+）占据Si-O片的双三角空穴有关。而且，g ca的super fine line。2. 2比2 7表明Cu~（2+）向八面体空位迁移。结果表明，蒙脱石对Cu 2+的吸附有交换吸附和特殊吸附两种类型。
XRD result of montmorillonite adsorbing Cu~(2+) shows its d(001) value is 1. 523 um which is different from that of the original sample with d(001 ) of 1. 479 um, suggesting that the inter-canons of montmorillonite have been replaced by hydrated copper ions. In the EPR spectra of montmorillonite adsorbing Cu~(2+), there are three signals relating with Cu~(2+). They are respectively located at g = 2. 07, g = 2. 14 which are fine lines and g ca. 2. 2 - 2. 7 which is supper fine line. It is proposed that there is three different structural state of Cu~(2+). EPR study of the thermal products of these montmorillonites shows that g = 2. 14 signal relates with hydrated copper ions existing in the interlayer of montmorillonites and g = 2. 07 signal relates with Cu~(2+) occupying the ditrigonal cavities of Si-O sheet. And, the supper fine line of g ca. 2. 2 - 2. 7 suggests Cu~(2+) migrating into octahedral vaeancies. It can be concluded that there is two adsorption styles of montmorillonite to Cu~(2+): exchangeable adsorption and special adsorption.