Adsorption of Cu2+and Cd2+in water by fly ash-based zeolite P
Zeolite P(Z-P)was synthesized from fly ash(FA)by hydrothermal reaction.Z-P was characterized by X-ray fluorescence spectrometer,X-ray diffractometer,field emission environmental scanning electron microscope,specific surface aperture analyzer,Fourier transform infrared spectrometer and X-ray photoelectron spectroscopy,and its adsorption properties for Cu2+and Cd2+were studied.The results showed that the BET specific surface area and pore volume of Z-P were 38.46m2/g and 0.2180cm3/g,respectively,which were higher than those of FA(1.273m2/g and 0.0120cm3/g).The adsorption of Cu2+and Cd2+by FA and Z-P was more in line with the pseudo-second-order kinetic model and the Langmuir isotherm model.The maximum adsorption capacities of Cu2+and Cd2+by Z-P were 157.48 and 131.57mg/g,respectively,which were much higher than those of FA(30.88 and 25.47mg/g).Z-P showed good cyclic regeneration and adsorption of Cd2+,but it showed poor cyclic regeneration and adsorption of Cu2+.The ionic strength promoted and inhibited the adsorption of Cu2+and Cd2+by Z-P,respectively.This paper shows that Z-P can be used as an effective and cheap adsorbent for Cu2+and Cd2+,which provides a method for the resource utilization of FA and the development of adsorbent for wastewater containing heavy metal ions of Cu2+and Cd2+.
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