Removal of Atrazine from Aqueous Solution by Natural and Activated Bentonite
1997
González-Pradas, E. | Villafranca-Sánchez, M. | Gallego-Campo, A. | Ureña-Amate, D. | Fernández-Pérez, M.
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 × 10³ cmol L⁻¹ and 1.00 × 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 × 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 (Xₘ). Values for Xₘ 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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