A novel effective adsorbent of alumina/silica oxide hydrate (ASOH) for arsenic removal was developed through simple chemical reactions using coal fly ash. The iron-modified ASOH with enhancing adsorption activity was further developed from raw fly ash based on the in situ technique. The adsorbents were characterized by X-ray diffraction, Fourier transform infrared spectrometry, scanning electron micrograph, laser particle size and Brunauer–Emmet–Teller surface area. The results show that the adsorbents are in amorphous and porous structure, the surface areas of which are 8–12 times that of the raw ash. The acidic hydrothermal treatment acts an important role in the formation of the amorphous structure of ASOH rather than zeolite crystal. A series of adsorption experiments for arsenic on them were studied. ASOH can achieve a high removal efficiency for arsenic of 96.4% from water, which is more than 2.5 times that of the raw ash. Iron-modified ASOH can enhance the removal efficiency to reach 99.8% due to the in situ loading of iron (Fe). The condition of synthesis pH = 2–4 is better for iron-modified ASOH to adsorb arsenic from water.
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Research Article|
January 27 2016
Arsenic removal from water using a novel amorphous adsorbent developed from coal fly ash Available to Purchase
Kaihua Zhang;
1Beijing Key Laboratory of Emission Surveillance and Control for Thermal Power Generation, North China Electric Power University, Beijing 102206, China
2Department of Energy Power & Mechanical Engineering, North China Electric Power University, Beijing 102206, China
E-mail: [email protected]
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Dongxue Zhang;
Dongxue Zhang
2Department of Energy Power & Mechanical Engineering, North China Electric Power University, Beijing 102206, China
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Kai Zhang
Kai Zhang
1Beijing Key Laboratory of Emission Surveillance and Control for Thermal Power Generation, North China Electric Power University, Beijing 102206, China
2Department of Energy Power & Mechanical Engineering, North China Electric Power University, Beijing 102206, China
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Water Sci Technol (2016) 73 (8): 1954–1962.
Article history
Received:
September 14 2015
Accepted:
January 07 2016
Citation
Kaihua Zhang, Dongxue Zhang, Kai Zhang; Arsenic removal from water using a novel amorphous adsorbent developed from coal fly ash. Water Sci Technol 27 April 2016; 73 (8): 1954–1962. doi: https://doi.org/10.2166/wst.2016.028
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