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Synthesis of magnetic ordered mesoporous carbon and its adsorption of bisphenol A in water |
BI Wei-wei, CHEN Ya, MA Xiao-yan, DENG Jing |
College of Civil Engineering, Zhejiang University of Technology, Hangzhou 310023, China |
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Abstract Magnetic ordered mesoporous carbon (Fe-OMC) was successfully synthesized via hydrothermal route and applied as adsorbent for the removal of bisphenol A (BPA) in water. Through the characterizations of high resolution transmission electron microscopy, X-ray diffraction, specific surface area analyzer and vibrating sample magnetometer, the adsorbent possessed large specific surface area, unique ordered mesoporous pore structure, rich oxygen-containing functional groups and high super paramagnetism. During the application, Fe-OMC could effectively adsorb and remove BPA from water and the equilibrium adsorption capacity reached 72.62mg/g, and still maintained favorable adsorption ability after separation and recovery. With increasing BPA concentration from 1mg/L to 20mg/L, the equilibrium adsorption capacity increased from 8.33mg/g to 91.78mg/g. As solution pH raised, it presented a trend of first decreasing, then increasing and finally decreasing and the highest adsorption occurred at pH 8 (75.34mg/g). The adsorption process could be well described by pseudo-second-order adsorption kinetic model and Langmuir adsorption isotherm model. The calculated thermodynamic parameters illustrated that the BPA adsorption onto Fe-OMC was a spontaneous and exothermic process.
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Received: 13 March 2020
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