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EXCHANGE EQUILIBRIUM OF AMMONIUM IONS ON NA~+-VERMICULITE

Xiaofu Wu

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Abstract

Experiment was designed under different pH and temperature conditions to analysis the NH4+ exchange capacity of Na+-vermiculite minerals pre-treated by NaCl solutions. The results indicate that the exchange reactions occurred most rapidly at the beginning 60 minutes and approached to equilibrium by about 120 minutes. The NH4+ exchange capacity of the minerals varied with pH with a peak value of 92.85mmol/100g at pH 7. Both the NH4+ exchange capacity and its selectivity of the minerals increased significantly with decrease in temperature.

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What this paper is about

Experiment was designed under different pH and temperature conditions to analysis the NH4+ exchange capacity of Na+-vermiculite minerals pre-treated by NaCl solutions. The results indicate that the exchange reactions occurred most rapidly at the beginning 60 minutes and approached to equilibrium by about 120 minutes. The NH4+ exchange capacity of the minerals varied with pH with a peak value of 92.85mmol/100g at pH 7. Both the NH4+ exchange capacity and its selectivity of the minerals increased significantly with decrease in temperature.

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Available abstract

Experiment was designed under different pH and temperature conditions to analysis the NH4+ exchange capacity of Na+-vermiculite minerals pre-treated by NaCl solutions. The results indicate that the exchange reactions occurred most rapidly at the beginning 60 minutes and approached to equilibrium by about 120 minutes. The NH4+ exchange capacity of the minerals varied with pH with a peak value of 92.85mmol/100g at pH 7. Both the NH4+ exchange capacity and its selectivity of the minerals increased significantly with decrease in temperature.

Key concepts: Chemistry, Vermiculite, Cation-exchange capacity, Ion exchange, Ammonium, Selectivity, Inorganic chemistry, Nuclear chemistry

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