Adsorption of Cd (II) and Zn (II) from aqueous solutions using magnetic hydroxyapatite nanoparticles as adsorbents

来自 dx.doi.org

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作者：

Y Feng，JL Gong，GM Zeng，QY Niu，HY Zhang，CG Niu，JH Deng，Y Ming

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摘要：

Magnetic hydroxyapatite nanoparticles (MNHAP) adsorbents were synthesized and were used for the removal of Cd 2+ and Zn 2+ from aqueous solutions. The properties of this magnetic adsorbent were characterized by scanning electron microscopy (SEM), energy dispersive analysis system of X-ray (EDAX), X-ray powder diffraction (XRD) analysis, zeta potential, BET surface area measurements and magnetization curves. Experiments were carried out to investigate the influence of different sorption parameters, such as contact time, initial concentration of metal ions, the dosage of MNHAP, pH value of the solutions and competitive adsorption behavior. Kinetic data are well fitted by a pseudo second-order model and the equilibrium data are analyzed by Langmuir model very well with high correlation coefficient. From the Langmuir isotherms, the maximum adsorption capacities of MNHAP adsorbents towards Cd 2+ and Zn 2+ are 1.964 and 2.151 mmol g 1, respectively. The results revealed that the most prominent advantage of the prepared MNHAP adsorbents consisted in their separation convenience compared to the other adsorbents.

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关键词：

Practical, Experimental/ adsorption cadmium chemical engineering magnetic separation nanoparticles scanning electron microscopy wastewater treatment X-ray diffraction zinc/ cadmium adsorption zinc adsorption aqueous solutions magnetic hydroxyapatite nanoparticles adsorbents X-ray powder diffraction XRD scanning electron microscopy SEM energy dispersive analysis system EDAX Langmuir isotherms magnetic separation Cd Zn/ E3626 Chemical industry E1525 Industrial processes E0230 Environmental issues E1710 Engineering materials/ Cd/el Zn/el