화학공학소재연구정보센터
Chemical Engineering Research & Design, Vol.147, 520-528, 2019
Preparation of CoFe2O4 nanoparticles based on high-gravity technology and application for the removal of lead
The aim of this paper is to explore a simple method for the preparation of magnetic bimetallic oxides with high production efficiency and high adsorption capacity of Pb(II). In this work, the CoFe2O4 nanoparticles were continuously synthesized through a high-gravity reactive precipitation method using an impinging stream-rotating packed bed reactor with a theoretical production rate of 0.704 kg h(-1). The samples were characterized by XRD, TEM, N-2 adsorption-desorption technique and VSM. The obtained results show that the as-prepared CoFe2O4 nanoparticles have higher surface area (89.15 m(2) g(-1)) and saturation magnetization (75.43 A m(2) kg(-1)) than that of single metal oxides (Fe2O3 and Co3O4). The adsorption data of Pb(II) onto CoFe2O4 nanoparticles fit well to pseudo-second order kinetic model and Langmuir isotherm model. The maximum adsorption capacity of Pb(II) onto CoFe2O4 was 326.79 mg g(-1), while for Fe2O3 and Co3O4 nanoparticles were 140.84 and 284.90 mg g(-1), respectively. Moreover, the proposed adsorbent exhibited good reusability for up five adsorption-desorption cycles. Hence, the high-gravity technology could prepare high adsorption adsorbent with high production efficiency, which brings good prospects in wastewater treatment. (C) 2019 Institution of Chemical Engineers. Published by Elsevier B.V. All rights reserved.