Removal of Reactive Blue 21 onto magnetic chitosan microparticles functionalized with polyamidoamine dendrimers |
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| Affiliation: | 1. Zhijiang College, Zhejiang University of Technology, Hangzhou, 310024, PR China;2. School of Mathematics and Physics Science, Dalian University of Technology at Panjin, Dalian, 124221, PR China;3. School of Economics and Management, Hainan University, Haikou, 570228, PR China;1. College of Chemistry, Chemical Engineering and Biotechnology, Donghua University, Shanghai 201620, People''s Republic of China;2. CQM-Centro de Química da Madeira, Universidade da Madeira, Campus da Penteada, 9000-390 Funchal, Portugal;3. State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, Donghua University, Shanghai 201620, People''s Republic of China;1. Department of Civil and Environmental Engineering, Hanyang University, Seoul, 04763, South Korea;2. Department of Materials Science and Chemical Engineering, Stony Brook University, Stony Brook, NY, 11794, USA |
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| Abstract: | Chitosan/poly(amidoamine) (MCS/PAMAM) microparticles were prepared as magnetic adsorbents for removal of Reactive Blue 21 (RB 21) dye from aqueous solution. Characterization of these particles was carried out using scanning electron microscopy, Fourier transform-infrared spectroscopy, X-ray diffractometry and vibrating sample magnetometry. The results indicate that the magnetic chitosan microparticles (MCS) were functionalized with PAMAM dendrimers and maintained its intrinsic magnetic properties. The effects of initial pH, adsorbent dose, initial concentration, contact time and temperature on adsorption were investigated. Kinetic studies showed that the dye adsorption process followed a pseudo-second-order kinetic model but that the adsorption rate was also influenced by intraparticle diffusion. Equilibrium adsorption isotherm data indicated a good fit to the Langmuir isotherm. The maximum adsorption capacities obtained from the Langmuir model were 555.56, 588.24, 625.00 and 666.67 mg g?1 at 303, 313, 323 and 333 K, respectively. The thermodynamic parameters revealed the feasibility, spontaneity and endothermic nature of the adsorption. Recycling experiments confirmed the relative reusability of the adsorbent. |
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| Keywords: | Chitosan Magnetic particles PAMAM dendrimers Anionic dye Adsorption model |
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