Grafting of aniline derivatives onto chitosan and their applications for removal of reactive dyes from industrial effluents

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• 作者：Mojtaba Abbasian^a ; ^{m_abbasian20@yahoo.com} ; ^{m_abbasian@pnu.ac.ir} ; Mehdi Jaymand^b ; ^{m_jaymand@yahoo.com} ; ^{m.jaymand@gmail.com} ; ^{jaymandm@tbzmed.ac.ir} ; Pouneh Niroomand^a ; Amir Farnoudian-Habibi^b ; Saber Ghasemi Karaj-Abad^c
• 关键词：Chitosan ; Polyaniline derivatives ; Acid red 4 ; Direct red 23 ; Adsorption kinetics ; Adsorption isotherm ; Environment treatment
• 刊名：International Journal of Biological Macromolecules
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：95
• 期：Complete
• 页码：393-403
• 全文大小：3158 K
• 卷排序：95

文摘

A series of chitosan-grafted polyaniline derivatives {chitosan-g-polyaniline (CS-g-PANI), chitosan-g-poly(N-methylaniline) (CS-g-PNMANI), and chitosan-g-poly(N-ethylaniline) (CS-g-PNEANI)} were synthesized by in situ chemical oxidation polymerization method. The synthesized copolymers were analyzed by means of Fourier transform infrared (FTIR), and ultraviolet-visible (UV–vis) spectroscopies, thermogravimetric analysis (TGA), and field emission scanning electron microscopy (FE-SEM). These copolymers were applied as adsorbent for removal of acid red 4 (AR4) and direct red 23 (DR23) from aqueous solutions. The adsorption processes were optimized in terms of pH, adsorbent amount, and dyes concentrations. The maximum adsorption capacities (Qm) for the synthesized copolymers were calculated, and among them the CS-g-PNEANI sample showed highest Qm for both AR4 (98 mg g−1) and DR23 (112 mg g−1) dyes. The adsorption kinetics of AR4 and DR23 dyes follow the pseudo-second order kinetic model. The regeneration and reusability tests revealed that the synthesized adsorbents had the relatively good reusability after five repetitions of the adsorption–desorption cycles. As the results, it is expected that the CS-g-PANIs find application for removal of reactive dyes (especially anionic dyes) from industrial effluents mainly due to their low production costs and high adsorption effectiveness.