'Rocky Mountain leather', sepiolite and attapulgite - an infrared emission spectroscopic study
'Rocky Mountain leather', sepiolite and attapulgite - an infrared emission spectroscopic study
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DOI：
10.1016/s0924-2031(98)00014-9
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发表时间：
1998-05-01
影响因子：
2.5
通讯作者：
Kloprogge, JT
中科院分区：
文献类型：
--
作者：
Frost, RL;Cash, GA;Kloprogge, JT
用红外发射光谱分析了粘土矿物凹凸棒石、海泡石和落基山革的脱水和脱羟基作用。“落基山皮革”和凹凸棒石被证明是相同的。热降解的红外发射光谱在100到700摄氏度的温度范围内被用来表征海泡石和凹凸棒石的热分解。凹凸棒石在1595和1635 cm（-1）处的水弯曲区有两个条带，分别归因于配位沸石和吸附水。在1425 cm（-1）处也观察到条带。凹凸棒土的羟基拉伸区是复杂的，在3731、3710、3670、3645、3610、3590和3532 cm处观察到条带（-1）。该区域的带被分配给水的羟基拉伸振动，发生在3600厘米（-1）以下，或与协同羟基相关的羟基带，发生在3600厘米（-1）以上。在3731和3710 cm（-1）处的前两个波段归因于SiOH拉伸振动。接下来的五个波段是与镁相关的羟基。另外两个类似于3385和3315 cm（-1）的羟基拉伸带属于两种类型的水分子，沸石水和配位水。海泡石的红外发射光谱存在较大差异。在3735、3722、3688和3670 cm处观察到四个羟基拉伸频率（-1）。这种差异归因于两种矿物的基本差异。凹凸棒石和海泡石脱水后，水羟基带强度降低。在3731和3532 cm（-1）之间的波段中，脱羟基作用后强度下降。300°C脱水完成，700°C部分去羟基化，Si-OH羟基保持到接近970°C (C) 1998 Elsevier Science B.V.。
The dehydration and dehydroxylation of the clay minerals attapulgite, sepiolite and 'Rocky Mountain leather' have been analysed by infrared emission spectroscopy. The 'Rocky Mountain leather' and attapulgite are shown to be identical. Infrared emission spectroscopy of the thermal degradation over the temperature range of 100 to 700 degrees C has been used to characterise the thermal decomposition of both sepiolite and attapulgite. Attapulgite is characterised by two bands in the water bending region at 1595 and 1635 cm(-1), attributed to coordinated zeolitic and adsorbed water, respectively. A band was also observed in this region at 1425 cm(-1). The hydroxyl stretching region of attapulgite is complex with bands observed at 3731, 3710, 3670, 3645, 3610, 3590, and 3532 cm(-1). Bands in this region are assigned to either hydroxyl stretching vibrations of water, occurring below 3600 cm(-1) or to hydroxyl bands associated with coordinated hydroxyl groups, occurring above 3600 cm(-1). The first two bands at 3731 and 3710 cm(-1) are attributed to SiOH stretching vibrations. The next five bands are attributed to hydroxyls associated with the magnesium. Another two hydroxyl stretching bands at similar to 3385 and 3315 cm(-1) are attributed to the two types of water molecules, the zeolitic water and coordinated water. The infrared emission spectra of sepiolite were found to be considerably different. Four hydroxyl-stretching frequencies were observed at 3735, 3722, 3688, and 3670 cm(-1). This difference is attributed to the basic difference in the two minerals. The dehydration of attapulgite and sepiolite is followed by the loss of intensity of the water hydroxyl bands. Dehydroxylation is followed by the decrease in intensity in the bands between 3731 and 3532 cm(-1). Dehydration was complete by 300 degrees C and partial dehydroxylation by 700 degrees C. The Si-OH hydroxyl groups remained until similar to 970 degrees C. (C) 1998 Elsevier Science B.V. All rights reserved.