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Wyoming bentonite was calcined at 350-550 o for 1, 3, and 12 h, dispersed in water and freeze-dried. Calcination at 350-450 o C for 12 h decreased the specific surface area strongly. At higher calcination temperatures, the surface area became similar to the value of the uncalcined bentonite (24 m 2 /g). The micropore (diameter <2 nm) volume of the calcined samples was very...
Highly delaminated montmorillonite (from Wyoming) with a high specific surface area when dispersed in water was used as an adsorbent of the hydrophobic herbicide metolachlor. The montmorillonite was coagulated with Na + , Ca 2+ , Al 3+ and benzyl trimethylammonium ions. Ca 2+ and Al 3+ screened the surface charges and the adsorption of metolachlor...
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