Characterisation of acid activated montmorillonite clay from Tuulant (Mongolia)

Temuujin, Jadambaa; Burmaa, G; Erdenechimeg, Sh.; Amarsanaa, J.; MacKenzie, Kenneth J.D.

doi:10.1016/s0272-8842(03)00096-8

Cited by 141 publications

(88 citation statements)

References 11 publications

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“…With the increase of concentration of HCl, the samples have showed a gradual decrease in CEC until treatment with 0.4 M HCl. In treatment with 0.6 M HCl, an increase of the CEC has been observed in comparison with the CEC of sample treated with 0.4 M HCl and this can also be explained by the process of passivation [25] [26].…”

Section: Chemical Compositionmentioning

confidence: 84%

Effect of Hydrochloric Acid on the Structural of Sodic-Bentonite Clay

Bendou¹,

Amrani²

2014

JMMCE

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The objective of this work is to determine changes of surface properties of a bentonite after acid activation, using hydrochloric acid solutions (HCl) at room temperature. XRD, FX, FTIR, MEB, and BET analyses of the samples have been carried out to examine the structure of bentonite before and after acid activation. It is found that the raw bentonite is composed of dioctahedral montmorillonite with predominant quantity and certain amounts of quartz, albite and illite, etc. It has an cation exchange capacity (CEC) of 74.32 meq/g which allows it to be characterized as typical sodium bentonite. The changes, at low acid concentrations, are the result from from cation exchange (exchangeable cations with H + ions). Differences of surface area at high acid concentrations (0.25 -0.4 M) were caused by structural changes and partial decomposition of the samples. Data of surface area measurements have showed that with increase of concentration of hydrochloric acid, the surface area increased. The maximum value (837.11 m 2 /g) was reached by the sample activated with 0.4 M HCl. By against, activation with higher concentration (0.6 M) caused a decrease in the surface area.

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Section: Chemical Compositionmentioning

confidence: 84%

Effect of Hydrochloric Acid on the Structural of Sodic-Bentonite Clay

Bendou¹,

Amrani²

2014

JMMCE

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“…The increase in the number of mesopores may be interpreted as an outcome of the removal of metal cations from the octahedral sheet. 21,31 The increase in the surface area results from the initial replacement of exchangeable cations by protons, which is followed by the extraction of Al, Fe, and Mg atoms from octahedral and tetrahedral sites. 13,14,32 Both the mesoporous volume (0.4023 cm 3 /g) and the mesoporous area (299.7±0.4 m 2 /g) reached a maximum for 0.4-AAB, because the vacancies that occurred The reduction of the specific surface area to 182.7±0.8 m 2 /g for 0.6-AAB may be ascribed to the change in the porosity distribution.…”

Section: Surface Area Measurements Of Raw and Acid-activated Bentonitesmentioning

confidence: 99%

Characterization of Unye bentonite after treatment with sulfuric acid

Çağlar¹,

Afsin²,

Koksal³

et al. 2013

Quím. Nova

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Recebido em 4/9/12; aceito em 25/3/13; publicado na web em 13/6/13Unye bentonite was found to consist predominantly of a dioctahedral smectite along with quartz, tridymite, cristobalite, and minor fractions of feldspar and anatase. A considerable amount of Al was retained as a constituent in acid-resistant impurities following the decomposition of the montmorillonite via acid treatment at an acid/clay ratio of 0.4. These impurities were mesoporous with a maximum surface area of 303.9±0.4 m 2 g -1 . A sharp decrease in the d 001 lattice spacing of the montmorillonite to 15.33 Å reflected the reduction of the crystallinity in the activated products. In addition, the increase in the ease with which newly formed hydroxyl groups were lost paralleled the severity of the acid treatment.

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“…In chemical activation, is generally used sodium carbonate or strong acids such as sulfuric acid. Acid activation was the subject of many studies [1][2][3][4], treating either, the various reaction mechanisms, or the effect of attack on the physicochemical characteristics of clay. The supreme goal of the clay activation, as by the sulphuric acid attack [5,6], it is the increase in porosity by peripheral dissolution of clay, in order to increase the number of the active sites: Indeed, the structural cations of clay (Al Adsorption is a reversible and interfacial physicochemical phenomenon causing the accumulation of solute's molecules in the solid-liquid interface (or solid-gas).…”

Section: Introductionmentioning

confidence: 99%

Characterization of Tataouines Raw and Activated Clay

Hattab¹

2013

J Chem Eng Process Technol

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This study deals with the mineralogical and thermal analysis of red clay taken from the south of Tunisia (Tataouine area) which will be used in industrial and environmental fields. In that purpose the study had recourse to several quantitative and qualitative research instruments: chemical analysis, mineralogical study and thermal analysis. The analyses were carried out by different methods such as: (i) X-ray diffraction (XRD), (ii) infrared spectroscopy (IR), (iii) thermogravimetric analysis (TGA), (iv) differential thermal analysis (DTA) and (v) cation exchange capacity (CEC). The data collected from these techniques show that illite and kaolinite are the major clay phases. The accessory minerals detected in powdered rock is calcite.The raw clay has undergone an acid activation using the sulfuric acid. The acid activation of south of Tunisia clay increase the specific surface area by adsorption of methylene blue from 117 m 2 /g to 163 m 2 /g. The experimental investigation is performed in accordance with the methodology of the factorial design of experiments. The different factors or parameters used in this methodology are: the temperature (T), the contact time (t), the liquid/solid ratio (R), and the acid concentration (C). The optimal conditions, obtained by the statistically designed experiments, for the best results of methylene blue adsorption were: 60 °C, a contact time of 1.5 h, a liquid/solid ratio of 7 and acid concentration of 20%. These parameters are applied in the preparation of the sample used in characterization study. The effect of the reaction conditions on the solid structure is investigated by comparison with the raw clay sample.

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Characterisation of acid activated montmorillonite clay from Tuulant (Mongolia)

Cited by 141 publications

References 11 publications

Effect of Hydrochloric Acid on the Structural of Sodic-Bentonite Clay

Effect of Hydrochloric Acid on the Structural of Sodic-Bentonite Clay

Characterization of Unye bentonite after treatment with sulfuric acid

Characterization of Tataouines Raw and Activated Clay

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