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Swelling properties of pure sodium and calcium bentonites

Iqbal, Aamar Mehmood (2012) KEMR17 20102
Department of Chemistry
Abstract
Swelling Properties of Pure Na and Ca bentonites

Swelling of natural bentonite, with mono and divalent counter ions and mixture of both bentonites, in heavy water is studied. For this purpose, pure Na and Ca bentonites are prepared by ion exchange method. 2HNMR technique is used to measure qudrupolar splitting. Electrostatic interaction between platelets is mainly responsible in swelling in case of Na bentonite dispersions. Quadrupolar splitting increases linearly with increase of concentration of pure Na bentonite up to Фc= 0.005. At higher concentrations, positive deviation from straight line is consequence of ordering of platelets. Dominant of van der Waals attraction between two platelets of montmorillonite causes limited swelling... (More)
Swelling Properties of Pure Na and Ca bentonites

Swelling of natural bentonite, with mono and divalent counter ions and mixture of both bentonites, in heavy water is studied. For this purpose, pure Na and Ca bentonites are prepared by ion exchange method. 2HNMR technique is used to measure qudrupolar splitting. Electrostatic interaction between platelets is mainly responsible in swelling in case of Na bentonite dispersions. Quadrupolar splitting increases linearly with increase of concentration of pure Na bentonite up to Фc= 0.005. At higher concentrations, positive deviation from straight line is consequence of ordering of platelets. Dominant of van der Waals attraction between two platelets of montmorillonite causes limited swelling of pure Ca bentonite. The results obtained from NMR and crosspolarizer experiments were used to study different phases in mixture of Ca bentonite- Na bentonite-water. (Less)
Popular Abstract
Swelling Properties of Pure Sodium and Calcium bentonites


Bentonite water system is found very useful in many industries. Due to its large number of applications especially in nuclear waste management, it has come under focus of many research groups around the world. The aim of this work is to study swelling properties of bentonite with mono and divalent counter ions in water. In present work natural MX-80 bentonite, a type of clay, was used to prepare sodium bentonite and Calcium bentonite by a special chemical process called ion exchange method.
The techniques used were NMR and Cross polarizer. It was observed that bentonite with monovalent counter ion swells in water to form gel like liquid. Swelleing increases with increase of... (More)
Swelling Properties of Pure Sodium and Calcium bentonites


Bentonite water system is found very useful in many industries. Due to its large number of applications especially in nuclear waste management, it has come under focus of many research groups around the world. The aim of this work is to study swelling properties of bentonite with mono and divalent counter ions in water. In present work natural MX-80 bentonite, a type of clay, was used to prepare sodium bentonite and Calcium bentonite by a special chemical process called ion exchange method.
The techniques used were NMR and Cross polarizer. It was observed that bentonite with monovalent counter ion swells in water to form gel like liquid. Swelleing increases with increase of water. The swelling of bentonite, with divalent counter ion, was limited and in this case bentonite sediment in water. In case of mixtures of both the clay, Calcium bentonite, which was settle down in water, dissolved in sodium bentonite suspension up to some extent, after that when amount of calcium bentonite was increased, it started to sediment.
This study gives more chance to know about swelling of bentonite in water, and this can be useful for research related to nuclear waste disposal. (Less)
Please use this url to cite or link to this publication:
author
Iqbal, Aamar Mehmood
supervisor
organization
course
KEMR17 20102
year
type
H2 - Master's Degree (Two Years)
subject
keywords
Fysikalisk kemi, Physical Chemistry
language
English
id
5114700
date added to LUP
2022-05-11 09:14:15
date last changed
2022-05-11 09:14:15
@misc{5114700,
  abstract     = {{Swelling Properties of Pure Na and Ca bentonites

Swelling of natural bentonite, with mono and divalent counter ions and mixture of both bentonites, in heavy water is studied. For this purpose, pure Na and Ca bentonites are prepared by ion exchange method. 2HNMR technique is used to measure qudrupolar splitting. Electrostatic interaction between platelets is mainly responsible in swelling in case of Na bentonite dispersions. Quadrupolar splitting increases linearly with increase of concentration of pure Na bentonite up to Фc= 0.005. At higher concentrations, positive deviation from straight line is consequence of ordering of platelets. Dominant of van der Waals attraction between two platelets of montmorillonite causes limited swelling of pure Ca bentonite. The results obtained from NMR and crosspolarizer experiments were used to study different phases in mixture of Ca bentonite- Na bentonite-water.}},
  author       = {{Iqbal, Aamar Mehmood}},
  language     = {{eng}},
  note         = {{Student Paper}},
  title        = {{Swelling properties of pure sodium and calcium bentonites}},
  year         = {{2012}},
}