The Porosity and Water Adsorption of Alumina Pillared Montmorillonite

Zhu, Hua; Gao, Wei-Xin; Vansant, Etienne F.

doi:10.1006/jcis.1995.1193

Cited by 44 publications

(26 citation statements)

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“…Initially, the heating rate of the calcination was adjusted to 10~ min ~ because immediate heat exposure of the hydroxy-interlayered montmorillonite may result in an irregular stacking of the 2:1 layers (Zhu et al, 1995).…”

Section: Preparation Of Hal Ai Hzr and Zr-mx80mentioning

confidence: 99%

Sorption of Heavy-Metal Cations by Al and Zr-Hydroxy-Intercalated and Pillared Bentonite

Matthes

Madsen

Kahr

1999

Clays and clay miner.

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Abstract--The sorption of Cd, Cu, Pb, and Zn ions by Na-rich bentonite, AI and Zr-pillared Na-rich bentonite (A1-MX80, Zr-MX80), the uncalcined hydroxy-intercalated precursors (HA1, HZr-MX80), and commercial Al-pillared bentonite EXM 534 was investigated. Experiments were conducted in ultrapure water and artificial leachate with varying pH. The experiments were performed over periods to 30 wk. Sorption characteristics were described with one and two-site Langmuir isotherms. The non-exchangeable quantities of heavy metals were determined by fusion of the sorbents after ion exchange with ammonium acetate.The sorption of Cd, Cu, Pb, and Zn by bentonite was dominated by cation exchange. In artificial leachate, the sorption was reduced due to competition with alkali and alkaline-earth cations. The sorption of Cu, Zn, and Pb at pH 4.9 and Cd at pH 6.9 by A1 and Zr-hydroxy-intercalated and pillared MX80 was governed also by cation exchange. In contrast, the sorbed quantities of Zn at pH 6.9 exceeded the cation exchange capacity (CEC) of HA1, HZr, A1, Zr-MX80, and EXM 534 and were partially nonexchangeable. The increase of the sorption of Zn with pH and its independence of the ionic strength of the solution at neutral pH suggest a complexation of Zn ions to surface hydroxyl groups of the intercalated A1 and Zr-polyhydroxo cations and pillars. This complexation is the dominating sorption mechanism. Removal of dissolved Zn from solution with time is attributed to surface precipitation. Al-hydroxy and pillared bentonites are considered potential sorbents of Zn ions from neutral pH aqueous solutions, such as waste waters and leachates.

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Section: Preparation Of Hal Ai Hzr and Zr-mx80mentioning

confidence: 99%

Sorption of Heavy-Metal Cations by Al and Zr-Hydroxy-Intercalated and Pillared Bentonite

Matthes

Madsen

Kahr

1999

Clays and clay miner.

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“…It has been found that the pH during the cation exchange has a very important influence on the cation exchange capacity of pillared montmorillonite (28,29). Interestingly, we found that cations can be introduced into the composite adsorbents by a cation exchange procedure very similar to that used for pillared clay (29). Generally, the higher the pH, the more cations can be loaded into the pillared clay.…”

Section: Figmentioning

confidence: 77%

“…is a useful technique for modifying the micropore size of these solids (19,27). It has been found that the pH during the cation exchange has a very important influence on the cation exchange capacity of pillared montmorillonite (28,29). Interestingly, we found that cations can be introduced into the composite adsorbents by a cation exchange procedure very similar to that used for pillared clay (29).…”

Section: Figmentioning

confidence: 78%

Development of Composite Adsorbents of Carbon and Intercalated Clay for N2and O2Adsorption: A Preliminary Study

Zhu

Vansant

1999

Journal of Colloid and Interface Science

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“…The comparison with silica gel and zeolites leads to the same results of all the materials. Zhu et al [25] have described water adsorption on the alumina ions pillared montmorillonite and suggested that water adsorbs in large pores. Malla et al [26,27] have compared the ZrO 2 -and TiO 2 -pillared montmorillonites with the Al 2 O 3 -pillared montmorillonites modified with Ca 2+ ions.…”

Section: Supportmentioning

confidence: 99%

Ammonia and water sorption properties of the mineral-layered nanomaterials used as the catalysts for NOx removal from exhaust gases

Olszewska

2006

Catalysis Today

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The Porosity and Water Adsorption of Alumina Pillared Montmorillonite

Cited by 44 publications

References 0 publications

Sorption of Heavy-Metal Cations by Al and Zr-Hydroxy-Intercalated and Pillared Bentonite

Sorption of Heavy-Metal Cations by Al and Zr-Hydroxy-Intercalated and Pillared Bentonite

Development of Composite Adsorbents of Carbon and Intercalated Clay for N2and O2Adsorption: A Preliminary Study

Ammonia and water sorption properties of the mineral-layered nanomaterials used as the catalysts for NOx removal from exhaust gases

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