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Organo-vermiculites modified by heating and gemini pyridinium surfactants: Preparation, characterization and sulfamethoxazole adsorption

2018; Elsevier BV; Volume: 546; Linguagem: Inglês

10.1016/j.colsurfa.2018.03.014

1873-4359

Jie Wang, Manglai Gao, Fan Ding, Tao Shen,

Adsorption and biosorption for pollutant removal

Organo-vermiculites (organo-Vts) with different preheating temperatures and gemini pyridinium surfactants (1,1'-didodecyl-4,4'-trimethylene bispyridinium bromide (BPy-12-3-12) and 1,1'-didodecyl-4,4' bispyridinium bromide (BPy-12-0-12)) were prepared and used as antibiotics adsorbents for the first time. The resultant adsorbents were characterized by Fourier Transform Infrared spectroscopy (FT-IR), X-ray diffraction (XRD), scanning electron microscope (SEM) and Zeta potential. Batch experiments were conducted to research adsorption of sulfamethoxazole (SMX) on organo-Vts. Vermiculite with BPy-12-3-12 showed higher removal efficiency (95%) than that of BPy-12-0-12-Vt (43%), and preheating at 100 °C further facilitated the efficiency up to 98%. Adsorption process was observed to be pH dependent and fast (95% were removed in 10 min), which followed a pseudo-second-order model as well as Freundlich isotherm. In addition, there is an interesting phenomenon that endothermic process occurred on BPy-12-3-12-Vt and BPy-12-3-12-Vt100, but exothermic one on other organo-Vts. In view of the practical significance, low concentration SMX in real-life waters were removed by organo-Vt, and the result showed an excellent and fast adsorption performance of this kind of adsorbent, even in low dosage of BPy-12-3-12 (0.4 CEC). Therefore, organo-Vts will challenge the current existing adsorbents as promising candidates.