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چکیده
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Up to date, researchers have focused on the tackle the problem of the water shortage crisis. The idea of making an efficient and stable adsorbent has been a topic of much thought to solve the problem of contaminated water. The aim of this study was to remove the cationic blue 41 (known as basic blue 41) from aqueous solutions by synthesis of a new nanocomposite. Iron-containing metal organic framework (NH2-MIL-88(Fe)), magnetic cobalt-zinc spinel ferrite nanoparticles (Co0.5Zn0.5Fe2O4) and graphene oxide were nominated to synthesis the nanocomposite [1, 2]. The synthesized adsorbent was characterized using FTIR, XRD, TEM, FESEM, elemental mapping, EDX, BET, VSM, and TGA techniques. The adsorption experiments were performed based on the suggestion of Central Composite Design and the operating conditions were optimized. Thus, the best removal was obtained 98.89% for an initial dye concentration of 10.0 mg·L-1 at temperature of 29.0 ºC, pH equal to 8.70 and adsorbent dosage of 0.0132 g·L-1. Interestingly, the adsorption process was too fast and almost completed within 60 s as the kinetics study showed. The fractal-like pseudo-first-order (FL-PFO) equation was the best model to fit the experimental kinetics data. It was proposed that the nature of NH2-MIL-88(Fe) along with π-stacking, H-bonding and coulombic attraction were dominant forces to adsorb cationic blue 41. Regeneration of the adsorbent was magnificently done by two different approaches; i) dye desorption using sodium chloride solution in the presence of ultrasonic waves (0.1 mol·L-1, 5 ml, with contacting time of 5 min), ii) degradation of dye by hybrid advanced oxidation process involving Fenton and ultrasound. Indeed, due to the presence of iron cation in the structure of nanocomposite, it was possible to decompose dye using Fenton method [3]. Consequently, the regenerating of adsorbent was successfully accomplished for six cycles.
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