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Removal of Atrazine from Aqueous Solution by Natural and Activated Bentonite

Dpto. Química Inorgánica, Universidad de Almería, Campus Universitario de La Cañada, 04071-Almeria, Spain.

^* Corresponding author (egonzalez{at}filabres.ualm.es).

ABSTRACT

To evaluate the potential use of bentonite in removing atrazine [2-chloro-4-ethylamino-6-isopropilamino-1,3,5-triazine] from water, the adsorption of atrazine on bentonite desiccated at 383 K untreated, and acid-treated with H₂SO₄ solutions over a concentration range between 0.25 x 10³ cmol L^–1 and 1.00 x 10³ cmol L^–1, from aqueous solution at 303 K has been studied by using batch experiments. In addition, column experiments were carried out with the bentonite samples treated with the 1.00 x 10³ cmol L^–1 H₂SO₄ [B-A (1.00)] using two aqueous atrazine solutions at C = 5.91 mg L^–1 and C = 9.78 mg L^–1 concentrations. The experimental data points have been fitted to the Langmuir equation to calculate the adsorption capacities (X_m). Values for X_m ranged from 0.07 g kg^–1 for the untreated bentonite up to 13.4 g kg^–1 for the [B-A (1.00)] samples. The removal efficiency (R) ranged from 2.71% for the B-N up to 83.5% for B-A (1.00). The batch experiments show that the acid-treated bentonite is more effective than the natural bentonite in relation to the adsorption of atrazine. The column experiments show that the B-A (1.00) sample might be reasonably used in removing atrazine, the column efficiency increasing from 47.5% for the C = 9.78 mg L^–1 aqueous solution of atrazine up to 63.4% for the C = 5.91 mg L^–1 one.

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