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Surfactant-modified bentonite clays: preparation, characterization, and atrazine removal

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Abstract

Bentonite clay was modified using quaternary ammonium cations, viz. phenyltrimethylammonium (PTMA), hexadecyltrimethylammonium (HDTMA), trioctylmethylammonium (TOMA) [100 % of cation exchange capacity of clay], and stearylkonium (SK) [100 % (SK-I) and 250 % (SK-II) of cation exchange capacity of clay]. The organoclays were characterized using X-ray diffraction (XRD), infrared (IR) spectroscopy, and scanning electron microscopy (SEM). Atrazine adsorption on modified clays was studied using a batch method. Bentonite clay was a poor adsorbent of atrazine as 9.4 % adsorption was observed at 1 μg mL−1 atrazine concentration. Modification of clay by PTMA cation did not improve atrazine adsorption capacity. However, atrazine adsorption in HDTMA-, TOMA-, and SK-bentonites varied between 49 and 72.4 % and data fitted well to the Freundlich adsorption isotherm (R > 0.96). Adsorption of atrazine in organoclays was nonlinear and slope (1/n) values were <1. The product of Freundlich adsorption constants, K f(1/n) in HDTMA-, TOMA-, and SK-I-bentonites was 239.2, 302.4, and 256.6, respectively, while increasing the SK cation loading in the clay (SK-II) decreased atrazine adsorption [K f(1/n) − 196.4]. Desorption of atrazine from organoclays showed hysteresis and TOMA- and SK-I-bentonites were the best organoclays to retain the adsorbed atrazine. Organoclays showed better atrazine removal from wastewater than an aqueous solution. The synthesized organoclays may find application in soil and water decontamination and as a carrier for atrazine-controlled released formulations.

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Acknowledgments

Anirban Dutta was supported by INSPIRE Fellowship from the Department of Science and Technology (DST), Government of India, New Delhi, India.

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  1. Division of Agricultural Chemicals, Indian Agricultural Research Institute, New Delhi, 110012, India

    Anirban Dutta & Neera Singh

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  1. Anirban Dutta
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  2. Neera Singh
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Correspondence to Neera Singh.

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Dutta, A., Singh, N. Surfactant-modified bentonite clays: preparation, characterization, and atrazine removal. Environ Sci Pollut Res 22, 3876–3885 (2015). https://doi.org/10.1007/s11356-014-3656-3

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