Amino-modified hollow alumina spheres: effective adsorbent for Cd2+, Pb2+, As(V), and diclofenac removal
Autor: | Vesna Nikolić, Miroslav Sokić, Mladen Bugarčić, Nataša Z. Tomić, Željko Kamberović, Aleksandar D. Marinković, Zlate Veličković |
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Rok vydání: | 2021 |
Předmět: |
Diclofenac
Materials science Health Toxicology and Mutagenesis Diffusion Adsorbent chemistry.chemical_element 010501 environmental sciences Kinetic energy 01 natural sciences Arsenic Spherical geometry symbols.namesake Adsorption Mass transfer Environmental Chemistry 0105 earth and related environmental sciences External gelatinization Langmuir adsorption model General Medicine Pollution Kinetic study Lead Chemical engineering chemistry Alumina spheres symbols SPHERES Cadmium |
Zdroj: | Environmental Science and Pollution Research |
ISSN: | 1614-7499 0944-1344 |
Popis: | A simple sol-gel method and external gelatinization method of hollow alumina spheres synthesis were developed in this study. The spheres were modified with polyethyleneimine (PEI) producing PEI-Al2O3 via (3-glycidyloxypropyl)trimethoxy-silane, GLYMO, linker. Characterization results, obtained using XRD and SEM microscopy revealed spherical geometry with a hollow core of PEI-Al2O3 adsorbent. Introduction of a large number of the amino group, 6.9 mmol g(-1), contributes to achieving high adsorption capacities, q(m), of 95.6, 124.9, 61.3, and 125.9 mg g(-1) for Cd2+, Pb2+, As(V), and DCF, respectively, which is obtained by using the Langmuir model. Thermodynamic studies indicated feasible adsorption and higher spontaneity with temperature increase. The kinetic study conveniently modeled using pseudo-second-order (PSO) and Weber-Morris kinetic model, as well as single resistance mass transfer model, indicated a change of the contribution of diffusional processes during adsorption with a dominance of intra-particle diffusion. The fixed-bed column adsorption data, fitted using Bohart-Adams, Clark, Yoon-Nelson, and Thomas models, showed lower capacity in comparison to batch study, and thus clear potential applicability of PEI-Al2O3 was deduced even at a high loading of feed water. |
Databáze: | OpenAIRE |
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