Local Cuban bentonite clay: composition, structure and textural characterization

IF 0.9 4区地球科学 Q3 GEOLOGY

Andean Geology Pub Date : 2021-06-15 DOI:10.5027/ANDGEOV48N3-3362

P. C. Quero-Jiménez, Lester Alejandro Arias Felipe, Julio Omar Prieto García, M. E. Rodriguez, Jorge Lopez, O. Montenegro, Reinaldo Molina Ruiz, I. Tiscornia

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引用次数: 0

Abstract

The Cuban bentonite clays have a specific surface area of 79.9098 m2.g-1, a pore volume of about 0.077612 cm3.g-1 and both isotherms exhibited a hysteresis loop of IV type. X-ray diffractogram of raw bentonite shows that the main mineralogical component is montmorillonite (> 90%). The mineral object study presents the first endothermic peak, characteristic of montmorillonite, in 48.11 ºC and others less accentuated (80.81, 94.01, 119.81 ºC) characteristic of calcium montmorillonite, that corresponds to the loss of water, and can be extended up to 250 ºC. The FTIR spectra showed the existence of Si-OH, Al-Al-OH, Al-Fe-OH, Al-Mg-OH and Si-O-Si functional groups in all clay samples, confirmed the presence of hydrated aluminosilicate in the clay, bands between 1120 and 461 cm-1 correspond to phyllosilicate structures and OH stretching vibrations were observed. The pH at the point of zero charge (pHPZC) obtained has a value of 8.1, which allows montmorillonite to be classified as basic. The structural formula for one-layer unit of montmorillonite was determined as (Na3.99Al0.01)(Al1.11Fe3+0.49Mg0.18Ti0.07)(Ca0.24Na0.15K0.01)O10(OH)2, indicate the location of the different cations in metal oxide octahedrons or tetrahedrons, respectively. From the results obtained by different methods and the analysis of the calculated structural formula, it can be concluded that the bentonite under study is a calcium montmorillonite, with a low specific surface area and little porosity.

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古巴当地膨润土粘土：成分、结构和结构特征

古巴膨润土粘土的比表面积为79.9098 m2。G-1，孔隙体积约为0.077612 cm3。g-1和两条等温线均表现为IV型滞后环。原料膨润土的x射线衍射图显示，其主要矿物成分为蒙脱土(> ~ 90%)。研究对象在48.11℃处表现出第一个吸热峰，即蒙脱土的特征，其余较不突出的(80.81、94.01、119.81℃)为钙蒙脱土的特征，对应于水分的损失，可延伸至250℃。FTIR光谱显示粘土样品中存在Si-OH、Al-Al-OH、Al-Fe-OH、Al-Mg-OH和Si-O-Si官能团，证实粘土中存在水化铝硅酸盐，在1120 ~ 461 cm-1之间的波段对应于层状硅酸盐结构，并观察到OH拉伸振动。得到的零电荷点pH值(pHPZC)为8.1，可以将蒙脱土归类为碱性蒙脱土。蒙脱土单层单元的分子式为(Na3.99Al0.01)(Al1.11Fe3+0.49Mg0.18Ti0.07)(Ca0.24Na0.15K0.01)O10(OH)2，分别表示不同阳离子在金属氧化物八面体或四面体中的位置。从不同方法得到的结果和计算出的结构式分析可以得出，所研究的膨润土是一种钙蒙脱土，具有低比表面积和小孔隙率。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Andean Geology 地学-地质学

CiteScore

3.90

自引率

0.00%

发文量

审稿时长

>12 weeks

期刊介绍： This journal publishes original and review articles on geology and related sciences, in Spanish or English, in three issues a year (January, May and September). Articles or notes on major topics of broad interest in Earth Sciences dealing with the geology of South and Central America and Antarctica, and particularly of the Andes, are welcomed. The journal is interested in publishing thematic sets of papers and accepts articles dealing with systematic Paleontology only if their main focus is the chronostratigraphical, paleoecological and/or paleogeographical importance of the taxa described therein.