Ionically crosslinked magnetic chitosan/κ-carrageenan bioadsorbents for removal of anionic eriochrome black-T
| Autor: | Gholam Reza Mahdavinia, Mahnaz Saraei, Ali Baghban, Bakhshali Massoumi, Mohammad Hasan Karimi |
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| Rok vydání: | 2018 |
| Předmět: |
02 engineering and technology
Carrageenan 010402 general chemistry 01 natural sciences Biochemistry Chitosan chemistry.chemical_compound symbols.namesake Adsorption Structural Biology Particle Size Magnetite Nanoparticles Molecular Biology Aqueous solution Dye adsorption technology industry and agriculture κ carrageenan Langmuir adsorption model General Medicine Hydrogen-Ion Concentration equipment and supplies 021001 nanoscience & nanotechnology 0104 chemical sciences Eriochrome Black T Kinetics chemistry symbols Magnetic nanoparticles Environmental Pollutants 0210 nano-technology Azo Compounds human activities Nuclear chemistry |
| Zdroj: | International Journal of Biological Macromolecules. 113:361-375 |
| ISSN: | 0141-8130 |
| DOI: | 10.1016/j.ijbiomac.2018.02.102 |
| Popis: | Magnetic bioadsorbents based on chitosan with different molecular weights were prepared. To stabilize under acidic condition the synthesized magnetic chitosan was crosslinked with κ-carrageenan. The characterization of magnetic bioadsorbents revealed that the size of magnetic nanoparticles is affected by the chitosan molecular weight. Magnetic nanoparticles with larger sizes were obtained with the high molecular weight of chitosan. The removal of eriochrome black-T (EBT) by the magnetic bioadsorbents was investigated. The equilibrium adsorption isotherm data of EBT on bioadsorbents were found to be well explained through Langmuir isotherm model, from which the maximum adsorption capacities were found to be 280, 235, and 199mg/g for bioadsorbents prepared with low, medium, and high molecular weights of chitosan, respectively. A remarkable reduction in adsorption capacities of bioadsorbents was observed as the pH of dye solution was increased. The reduction in the dye adsorption under basic media suggested using a mild condition (pH=9) to recycle and reuse the bioadsorbents. Cyclic experiments indicated that current bioadsorbents can be effectively reused to remove anionic EBT from aqueous solutions. The removal efficiencies remained >93% even after five adsorption-desorption cycles, which suggest the present bioadsorbents as a great candidate in the wastewater treatment. |
| Databáze: | OpenAIRE |
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