Synthesis of Chitosan/Maleate-Alumoxane nanocomposite membranes for adsorption of anionic dye
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pISSN: 0256-1115 eISSN: 1975-7220
INVITED REVIEW PAPER
INVITED REVIEW PAPER
Synthesis of Chitosan/Maleate-Alumoxane nanocomposite membranes for adsorption of anionic dye Pegah Amiri*, Jamshid Behin*,†, Laleh Rajabi**, and Meisam Ansari* *Advanced Chemical Engineering Research Center, Faculty of Petroleum and Chemical Engineering, Razi University, Kermanshah, Iran **Polymer Research Center, Faculty of Petroleum and Chemical Engineering, Razi University, Kermanshah, Iran (Received 3 December 2019 • Revised 14 March 2020 • Accepted 16 May 2020) AbstractChitosan/Mal-A nanocomposite membranes were synthesized and used for adsorption of Reactive Yellow 84 (RY 84) from aqueous solution. The membranes were prepared by solution-casting method with 2 wt% Chitosan (Cs) and various ratios of Mal-A (0.3-0.9 wt%). FTIR and SEM analyses were used to characterize the Cs-based membrane. The results showed that a dense-thin-face layer associated with an open-structure layer was formed in the composite membrane containing 0.5 wt% Mal-A. Membrane performance was investigated as dye removal and permeate flux. The significant effects of the operating variables including pH, initial concentration of dye, and Cs/Mal-A dose, were evaluated on RY removal efficiency using response surface methodology (RSM). The results obtained from the experimental data were presented with the quadratic regression model. The adsorption kinetics and equilibrium isotherm were well described by the pseudo-second order and the Langmuir model, respectively. Adding Mal-A nanoparticles to the Cs matrix (0.5 wt%) improved liquid permeability by 21% compared with the Cs membrane, while dye removal efficiency for both membranes remained approximately 100% at acidic pH and under a trans-membrane pressure of 3 bar. The protonation of the amine groups in CS/Mal-A results in a positive charge on the membrane surface which causes a complete removal of the anionic dye. The permeability improvement of ~57.2% for the composite membrane was achieved at a pressure difference of 5 bar, which corresponded to an efficiency reduction of 10%. Keywords: Nanocomposite Membrane, Chitosan, Maleate-Alumoxane, Reactive Yellow 84, Adsorption
brane adsorbent based on chitosan (Cs) were found to be the promising forms [18,19]. Improvement of mechanical properties and efficiency of Cs for dye removal were considered as the main objectives of the manufacture of such composites [20]. A Cs/ZnO nanocomposite powder was successfully used to remove two types of textile dyes from aqueous effluents [21]. Recently, a porous Cs/Hydroxyapatite membrane was synthesized to test the dynamic removal of textile dye. The optimum removal condition was obtained using the membrane containing 30% hydroxyapatite in acidic solution [22]. Because of its useful synergic properties, nanocomposites can increase liquid flux, dye removal efficiency and strength of polymer base membrane [23]. The blending of nanocomposite membranes with inorganic fillers will combine the benefits of the polymer matrix with those of
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