摘要
由于晶体结构的制约,蒙脱石和凹凸棒石具有不同的形态和物理化学性质,在水悬浮体系中必定存在蒙脱石和凹凸棒石的互相作用,但这种互相作用的形式和科学意义未曾被人认知。通过蒙脱石和凹凸棒石分散、悬浮液混合、固液分离处理,经XRD、TEM、SSA分析证实,水悬浮体系蒙脱石和凹凸棒石存在胶体互相作用,并且以面 面形式结合。研究结果的理论和实际意义表现在以下三个方面:①为合理解释凹凸棒石蒙脱石混合粘土吸附现象和物理化学性质提供新的视角;②凹凸棒石可以作为蒙脱石粘土的改性剂,在蒙脱石粘土中添加少量的凹凸棒石即可达到提高比表面积的效果,可以利用蒙脱石和凹凸棒石的互相作用来制备类似柱撑粘土的纳米孔结构材料;③凹凸棒石粘土样品湿法处理时,水悬浮体系中不同矿物胶体颗粒互相作用会影响X射线粉末衍射分析结果,对此现象在粘土矿物定量研究中应引起重视。
Smectite and palygorskite are significantly different in morphology and surface property because of crystal structure constraints. Interaction between smectite and palygorskite must exist in the colloid system of aqueous suspension and should affect the properties of palygorskite clay, but the interaction form and its scientific significance are not understood. Results of XRD, TEM, and SSA studies confirmed that the interaction between smectite and palygorskite is an important phenomenon, which results in surface-surface aggregation of smectite and palygorskite through the process of dispersing treatment, mixture of suspension, separation of solid and liquid, and sample preparation. On one hand, the interaction will affect the XRD quantitative analysis of clay minerals, on the other hand, the interaction will result in the mixing of nanometer-sized lamina of smectite and nanometer-sized fibers of palygorskite and nanometer-sized porous structure under the controlling condition in the system of aqueous suspension. Nanometer-sized composite material of smectite and palygorskite prepared according to the interaction-sized is of potential application in catalysis, adsorption decoloration, and treatment of wastewater and waste gas.
出处
《矿物学报》
CAS
CSCD
北大核心
2003年第4期313-318,共6页
Acta Mineralogica Sinica
基金
国家自然科学基金(编号:40072017)
重大基础研究(编号:2001CCA02400)
