Sorption of Pb2+ and Zn2+ions on Zr-Ca-Mg phosphates: Kinetics and mechanism studies
Kitikova N. Ivanets A. Shashkova I. Kulbitskaya L. Baigenzhenov O. Sillanpää M.
July 2023Elsevier Ltd
Journal of Water Process Engineering
2023#53
The kinetics study of Pb2+ and Zn2+ ions adsorption by low-cost mixed Zr-Ca-Mg phosphates with a different Zr/(Ca + Mg) ratio was carried out, for the first time. The effect of chemical composition on adsorption characteristics of obtained adsorbents was established. It was shown that an increase of Ca2+ and Mg2+ cations content in the composition of Zr-Ca-Mg phosphate adsorbents contributed to an increase in the adsorption capacity to Pb2+ (3.82–4.76 mmol/g) and Zn2+ (2.60–4.13 mmol/g) ions. Such improvements in the adsorption capacities were due to the amelioration of the textural properties of adsorbents, so that ABET of adsorbents was in the range of 68–96 m2/g and Vdes BJH of adsorbent was in the range of 0.19–0.24 cm3/g. On the other hand, increase of Ca2+ and Mg2+ cations led to a high difference in solubility products of initial phosphates and spent adsorbents. Kinetic data of Pb2+ and Zn2+ ions adsorption revealed that the adsorption rate is controlled by film diffusion, intraparticle diffusion and chemical interaction, which was confirmed by the results of X-ray diffraction analysis of spent adsorbents and described by the pseudo-second-order model. The increase of zirconium content caused an increase in the rate constant of the pseudo-second-order of Pb2+ and Zn2+ ions adsorption. Intraparticle diffusion had a significant effect on Zn2+ ions adsorption. Due to the suitable kinetics parameters and sorption capacities of composite Zr-Ca-Mg phosphates for divalent metal ions, these sorbents can be recommended as effective materials for heavy metals removal.
Adsorption kinetics , Pb2+ and Zn2+ ions adsorption , Wastewater treatment , Zr-ca-mg phosphates
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Institute of General and Inorganic Chemistry of the National Academy of Sciences of Belarus, Surganova st., 9/1, Minsk, 220072, Belarus
Department of Metallurgical Sciences, Satbayev University, 22a Satbaev str., Almaty, 050013, Kazakhstan
Department of Chemical Engineering, School of Mining, Metallurgy and Chemical Engineering, University of Johannesburg, P. O. Box 17011, Doornfontein, 2028, South Africa
International Research Centre of Nanotechnology for Himalayan Sustainability (IRCNHS), Shoolini University, Himachal Pradesh, Solan, 173212, India
Zhejiang Rongsheng Environmental Protection Paper Co. LTD, NO.588 East Zhennan Road, Pinghu Economic Development Zone, Zhejiang, 314213, China
Department of Civil Engineering, University Centre for Research & Development, Chandigarh University, Gharuan, Punjab, Mohali, India
Institute of General and Inorganic Chemistry of the National Academy of Sciences of Belarus
Department of Metallurgical Sciences
Department of Chemical Engineering
International Research Centre of Nanotechnology for Himalayan Sustainability (IRCNHS)
Zhejiang Rongsheng Environmental Protection Paper Co. LTD
Department of Civil Engineering
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