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Efficient removal of antibiotics in a fluidized bed reactor by facile fabricated magnetic powdered activated carbon

Ma, Jianqing, Yang, Qunfeng, Xu, Dongmei, Zeng, Xiaomei, Wen, Yuezhong, Liu, Weiping
Environmental science and pollution research international 2017 v.24 no.4 pp. 3820-3828
activated carbon, adsorbents, adsorption, antibiotics, coprecipitation, fluidized beds, hydrogels, ions, iron oxides, magnetic fields, magnetic properties, pH, pollutants, water treatment
Powdered activated carbons (PACs) with micrometer size are showing great potential for enabling and improving technologies in water treatment. The critical problem in achieving practical application of PAC involves simple, effective fabrication of magnetic PAC and the design of a feasible reactor that can remove pollutants and recover the adsorbent efficiently. Herein, we show that such materials can be fabricated by the combination of PAC and magnetic Fe₃O₄ with chitosan-Fe hydrogel through a simple co-precipitation method. According to the characterization results, CS–Fe/Fe₃O₄/PAC with different micrometers in size exhibited excellent magnetic properties. The adsorption of tetracycline was fast and efficient, and 99.9% removal was achieved in 30 min. It also possesses good usability and stability to co-existing ions, organics, and different pH values due to its dispersive interaction nature. Finally, the prepared CS–Fe/Fe₃O₄/PAC also performed well in the fluidized bed reactor with electromagnetic separation function. It could be easily separated by applying a magnetic field and was effectively in situ regenerated, indicating a potential of practical application for the removal of pollutants from water.