Effect of pH in an Aqueous Medium on the Surface Area, Pore Size Distribution, Density, and Porosity of Montmorillonite

Altın, Orhan; Özbelge, H. Önder; Doğu, Timur

doi:10.1006/jcis.1999.6271

Cited by 62 publications

(27 citation statements)

References 27 publications

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“…The specific surface area of dry NaMt was measured by means of N 2 adsorption using the BET multipoint method in a Quantasorb Jr (Quantachrome, USA). The value obtained, 54.1 m 2 /g, is very similar to that reported by different authors (21,22).…”

Section: Methodssupporting

confidence: 93%

Rheological and Electrokinetic Properties of Sodium Montmorillonite Suspensions

Durán

Ramos-Tejada

Arroyo

et al. 2000

Journal of Colloid and Interface Science

202

101

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Section: Methodssupporting

confidence: 93%

Rheological and Electrokinetic Properties of Sodium Montmorillonite Suspensions

Durán

Ramos-Tejada

Arroyo

et al. 2000

Journal of Colloid and Interface Science

202

101

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“…The decrease in lead sorption at low pH values (pH`5) is apparently due to an increase in competition for adsorption sites by H and the effect of dissolution of Al 3 ions from the crystal lattice. 20 The¯ow rate effect was investigated by lowering it from 1 to 0.5 cm 3 min À1 . The BTCs appeared almost twice as slowly, because the increase in the residence time causes more sorption of heavy metal ions in the column.…”

Section: Resultsmentioning

confidence: 99%

Effect of pH, flow rate and concentration on the sorption of Pb and Cd on montmorillonite: I. Experimental

Altın

Ozbelge

Doğu

1999

J. Chem. Technol. Biotechnol.

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Continuous column adsorption of lead (Pb) and cadmium (Cd) was studied using pH adjustment and calcium-saturated montmorillonite in a short stainless steel column. Changing either pH or¯ow rate, while keeping inlet concentration of the ions constant, led to considerable changes in ef¯uent concentrations and breakthrough curves (BTCs). At low pH values (2±4), H ions competed strongly with lead and cadmium ions; at intermediate pH (4±6), ionic size played the major role in adsorption and ion exchange and at high pH (6±9) precipitation was the major process taking place especially for lead sorption. At low¯ow rates less than 0.5 cm 3 min À1, sorption of both lead and cadmium increased due to the long retention time in the column. When both lead and cadmium ions were present in the feed, adsorption remained the same while that of cadmium decreased compared with single ion experiments.

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“…The removal of Cu and Zn ions from wastewater is controlled by the solution composition [3], namely, pH, ionic strength, and solid concentration, besides the residence time (aging) of the solid phase in the wastewater [4][5][6].…”

Section: Introductionmentioning

confidence: 99%