Herein, chitosan (CS) impregnated with nanoparticles of zero-valent iron (NZVI) was fabricated onto a magnetic composite of CS@NZVI as an adsorbent for cadmium (Cd2+) removal from aqueous solution. The characteristics of CS@NZVI were analyzed by Fourier transform infrared spectroscopy, X-ray diffraction, transmission electron microscopy, CHONS and Brunauer, Emmett and Teller techniques. The average diameter of NZVI was found to be 50 nm, and it was successfully coated onto the CS. The influential experimental variables such as contact time, solution pH, adsorbent dosage and initial Cd2+ concentration were investigated to determine optimum conditions. Results revealed that with an optimum dosage rate of 0.6 g/L, Cd2+ concentration was reduced from 10 to 0.016 mg/L within 90 min reaction time at pH of 7 ± 0.2. Experimental data were fitted to the Freundlich and pseudo-second-order models. Maximum adsorption capacity was obtained from the Langmuir monolayer 142.8 mg/g. Desorption experiments showed that the CS@NZVI had good potential with regard to regeneration and reusability, and its adsorption activity was preserved effectively even after three successive cycles owing to its good stability. As a conclusion, CS@NZVI can be considered as an effective adsorbent for heavy metals removal from water and wastewaters, because it can be separated both quickly and easily, it has high efficiency, and it does not lead to secondary pollution.
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15 March 2017
This article was originally published in
Journal of Water Supply: Research and Technology-Aqua
Article Contents
Research Article|
January 30 2017
Synthesis of chitosan zero-valent iron nanoparticles-supported for cadmium removal: characterization, optimization and modeling approach
Mehdi Ahmadi;
Mehdi Ahmadi
1Environmental Technologies Research Center, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran
3Department of Environmental Health Engineering, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran
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Majid Foladivanda;
Majid Foladivanda
3Department of Environmental Health Engineering, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran
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Nemat Jaafarzadeh;
Nemat Jaafarzadeh
1Environmental Technologies Research Center, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran
3Department of Environmental Health Engineering, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran
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Zahra Ramezani;
Zahra Ramezani
2Nanotechnology Research Center, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran
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Bahman Ramavandi;
4Department of Environmental Health Engineering, Bushehr University of Medical Sciences, Ahvaz, Iran
E-mail: [email protected]
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Sahand Jorfi;
Sahand Jorfi
1Environmental Technologies Research Center, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran
3Department of Environmental Health Engineering, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran
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Babak Kakavandi
Babak Kakavandi
1Environmental Technologies Research Center, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran
3Department of Environmental Health Engineering, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran
5Student Research Committee, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran
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Journal of Water Supply: Research and Technology-Aqua (2017) 66 (2): 116–130.
Article history
Received:
April 29 2016
Accepted:
October 26 2016
Citation
Mehdi Ahmadi, Majid Foladivanda, Nemat Jaafarzadeh, Zahra Ramezani, Bahman Ramavandi, Sahand Jorfi, Babak Kakavandi; Synthesis of chitosan zero-valent iron nanoparticles-supported for cadmium removal: characterization, optimization and modeling approach. Journal of Water Supply: Research and Technology-Aqua 15 March 2017; 66 (2): 116–130. doi: https://doi.org/10.2166/aqua.2017.027
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