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Tannin‐immobilized cellulose microspheres as effective adsorbents for removing cationic dye (Methylene Blue) from aqueous solution
Author(s) -
Pei Ying,
Wu Xingjun,
Xu Gaoqiang,
Sun Zhenjie,
Zheng Xuejing,
Liu Jie,
Tang Keyong
Publication year - 2017
Publication title -
journal of chemical technology and biotechnology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.64
H-Index - 117
eISSN - 1097-4660
pISSN - 0268-2575
DOI - 10.1002/jctb.5121
Subject(s) - adsorption , cationic polymerization , aqueous solution , methylene blue , zeta potential , fourier transform infrared spectroscopy , langmuir adsorption model , chemistry , chemical engineering , cellulose , nuclear chemistry , emulsion , materials science , chromatography , polymer chemistry , organic chemistry , catalysis , nanoparticle , photocatalysis , engineering
BACKGROUND Tannin‐immobilized cellulose (T/C) microspheres were fabricated by a facile homogeneous reaction in a water/oil (W/O) emulsion for the removal of cationic dye from aqueous solution. The microspheres were characterized by scanning electron microscopy ( SEM ), Fourier transform infrared spectroscopy ( FTIR ) and Zeta potentials test. Setting methylene blue ( MB ) as a cationic dye model, the adsorption isotherms, kinetics and effect factors of MB adsorption were investigated to evaluate the effectiveness for dye removal. RESULTS The microspheres exhibited porous structure. Cellulose contributed to provide a support for the porous structure, and immobilized tannins acted as adsorbent sites which combined with MB by electrostatic attraction, resulting in the attractive adsorption ability of T/C microspheres. Microspheres exhibited rapid adsorption rate even when the initial MB concentration was 1500 mg L −1 . The pseudo‐first‐order, pseudo‐second‐order and intraparticle diffusion models were used to fit adsorption data in the kinetic studies. Results indicated that the adsorption kinetic was more accurately described by the pseudo‐second‐order model. It has been demonstrated that the better agreement was with the Langmuir isotherm with correlation coefficient >0.9996. Regeneration experiments showed that T/C microspheres can be reused at least three times without obvious loss of their original adsorption capacity. CONCLUSION The results revealed that the T/C microspheres can be considered as a stable and effective adsorbent for cationic dye removal from industrial effluents. Tannin immobilization and material forming were simultaneously implemented by a facile homogeneous reaction in W/O emulsion, providing a new pathway to fabricate tannin‐immobilized materials for water treatment. © 2016 Society of Chemical Industry