Synthesis and characterization of a novel biodegradable cellulose acetate-chitosan biosorbent for water purification and treatment purposes
A novel biosorbent for water desalination and water treatment derived from biodegradable cellulose acetate (CA) and chitosan (CS) was successfully synthesized at optimized synthesis parameters of 1: 1 CA: CS ratio, pH 4, 3 h reaction time, and 120 Â± 5 Â°C. The biosorbent was characterized by Fourier Transform Infra-Red (FTIR) spectroscopy, Brunauerâ€“Emmettâ€“Teller (BET) analysis, Scanning Electron Microscopy (SEM), thermogravimetric analysis TGA, and X-ray diffraction. Sorption of the monovalent and divalent salts (NaCl and MgSO4) was performed in a batch-type system under different operating conditions of time, initial concentration and adsorbent dose. The efficiency of the biosorbent to reject metal ions (Mg(II), Na) and non-metal ions (sulfate and chloride) from solution was investigated, where the amount of adsorbate was quantified using ICP-AES spectrometry and conductivity measurements. The synthesized biosorbent succeeded in removing SO42- and Cl- from aqueous solutions with a maximum uptake capacity of 70 and 23 mg/g as well as % removal of 37 % and 11 % for SO42- and Cl-, respectively (contact time 150 min, pH 5.5, and temperature 23 Â± 2 Â°C) at initial concentration 700 mg L-1and dose 5 g/L for sulfate and 1000 mg L-1 for chloride. The % yield and % swelling of 70 and 112 % respectively obtained at the optimized synthesis conditions. Equilibrium studies revealed that the sorption process followed Freundlich isotherm behavior while sorption kinetics followed a pseudo-second order kinetic model with the highest adsorption rate constant k2 of 0.10 (g mg-1 min-1)2at 100 mgL-1 and the correlation coefficient R2 more than 0.995 implying a chemisorption mechanism. Furthermore, the biosorbent showed promising results in the removal of heavy metal ions of Ni (II), Cr (VI), Pb (II), and Co (II) with efficiencies of 85, 58, 36, and 29 %, respectively.
MS in Chemistry
Madkour Tarek, Elsayed Mayyada
Committee Member 1
Abdel Fattah, Mohamed Saleh
Committee Member 2
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(2019).Synthesis and characterization of a novel biodegradable cellulose acetate-chitosan biosorbent for water purification and treatment purposes [Master's Thesis, the American University in Cairo]. AUC Knowledge Fountain.
Farag, Emad Raafat. Synthesis and characterization of a novel biodegradable cellulose acetate-chitosan biosorbent for water purification and treatment purposes. 2019. American University in Cairo, Master's Thesis. AUC Knowledge Fountain.