Preparation and characterization of aluminum pillared K10 and KSF for adsorption of trimethoprim |
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| Authors: | Zehra Bekçi Molu Kadir Yurdakoç |
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| Affiliation: | 1. Program in Science and Materials Engineering, Federal University, Rio Grande do Norte, Laboratory of Molecular Sieves — LABPEMOL, 59078-970, RN, Brazil;2. Federal University of Fronteira Sul, 99700-000 Erechim, RS, Brazil;3. Institute of Chemistry, Federal University of Rio Grande do Norte, 59078-970 Natal, RN, Brazil;1. Laboratorio de Sólidos Porosos, Instituto de Física Aplicada, CONICET — Universidad Nacional de San Luis, Chacabuco 917, CP 5700 San Luis, Argentina;2. Laboratorio de Arcillas, Facultad de Ingeniería, Universidad Nacional del Comahue, Buenos Aires 1400, 8300 Neuquén, Argentina;3. Departamento de Química Inorgánica, Cristalografía y Mineralogía, Facultad de Ciencias, Universidad de Málaga, Campus de Teatinos s/n, 29071 Málaga, Spain;4. Instituto de Catálisis y Petroleoquímica, CSIC, Cantoblanco, 28049 Madrid, Spain;1. Key Laboratory of the Ministry of Education for Synthetic and Natural Functional Molecule Chemistry, College of Chemistry & Material Science, Northwest University, Xi''an 710069, China;2. Key Laboratory of Northwest Water Resources, Environment and Ecology, Ministry of Education, Xi''an University of Technology, Xi''an 710048, China |
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| Abstract: | Montmorillonite KSF and K10 were used as precursor materials for synthesis of aluminum pillared K10 and KSF (Al-K10 and Al-KSF) which characterized by TGA, XRD, SEM and FT-IR spectroscopic analysis. The sorption of trimethoprim (TMP) which is commonly employed as an antibiotic onto Al-K10 and Al-KSF was also investigated as a function of adsorbent dosage, solution pH, contact time and temperature. The adsorption kinetics was interpreted using pseudo-first-order, pseudo-second-order kinetic models and intraparticle diffusion model. The pseudo-second-order model provided the best correlation. Adsorption isotherm parameters were obtained from Freundlich, Langmuir and Dubinin–Radushkevich (DR) isotherm models. Adsorption of TMP onto Al-K10 and Al-KSF was physical in nature and ion-exchange mechanism for DR equation, respectively. Al-K10 exhibits higher removal capacity at lower adsorbent dosages in comparison with Al-KSF. The removal capacity was increased by increasing pH. ΔH0, ΔS0 and ΔG0 showed that adsorption of trimethoprim was endothermic, increasing randomness and not spontaneous in nature. |
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