A new organoclay (BENZAL-BENT) was synthesized through the modification of bentonite clay (BENT) with benzalkonium chloride (BENZAL) by ionic exchange to improve the adsorption of triclosan (TCS); which is an emergent pollutant. The organoclay was synthesized by adding 100 g of bentonite to a dissolution 0.178 M of benzalkonium chloride, the mixture was stirred, 24 h, filtered and washed exhaustively with water. The materials were characterized by FTIR spectroscopy, the new organoclay BENZAL-BENT showed three bands at 2926 cm–1, 2851 cm–1, and 1468 cm–1 corresponding to the terminal methyl of the benzalkonium cation aliphatic chain stretch, methylene -CH2- flexion, and aromatic ring carbon-carbon C=C-C flexion, respectively. This confirmed the presence of the organic cation incorpored into the clay structure. Additionally, both materials showed a band at 1007 cm–1 corresponding to the stretch of SiO2 which confirmed that the laminar structure of the clay was preserved. According to the batch adsorption test for triclosan (TCS) dissolved in water in natural BENT and in the BENZAL-BENT, Freundlich adsorption isotherm was the one that best described the process and due to it, it was established that the natural BENT and BENZAL-BENT absorption occurred on a heterogeneous surface with multilayers which imply that it was a non-uniform adsorption. The Freundlich Constants obtained from the isotherms were 11.54 mg of TCS/g BENT and 69.73 mg of TCS/g of BENZAL-BENT respectively, these constants indicate the adsorption capacity of the surface and, based on these, it's clear that the modification of the clay improves the adsorption of TCS due to the adsorption capacity increase.
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