NOVEL MAGNETIC ALGINATE/HYDROXYAPATITE COMPOSITE WITH HIGH-EFFICIENCY CADMIUM-ADSORPTION PERFORMANCE

Xiao Xiao; Jiabei Zhou; Dali Zhou; Liang Li; Yingjiang Wu; Xiang Zhou; Lang Du; Honggen Chen

doi:10.17222/mit.2023.927

Xiao Xiao Sichuan Institute of Product Quality Supervision, Inspection and Testing, Chengdu 610100, China
Jiabei Zhou School of Chemical Engineering, Sichuan University, Chengdu 610064, China
Dali Zhou School of Materials Science and Engineering, Sichuan University, Chengdu 610064, China
Liang Li Sichuan Institute of Product Quality Supervision, Inspection and Testing, Chengdu 610100, China
Yingjiang Wu Sichuan Institute of Product Quality Supervision, Inspection and Testing, Chengdu 610100, China
Xiang Zhou Sichuan Institute of Product Quality Supervision, Inspection and Testing, Chengdu 610100, China
Lang Du Sichuan Institute of Product Quality Supervision, Inspection and Testing, Chengdu 610100, China
Honggen Chen Sichuan Institute of Product Quality Supervision, Inspection and Testing, Chengdu 610100, China

DOI: https://doi.org/10.17222/mit.2023.927

Keywords: magnetic alginate/hydroxyapatite composite, Cd(II), water-dispersible adsorbent, magnetic separation

Abstract

Heavy-metal pollution (such as Cd(II)) is regarded as a serious environmental problem, posing a great threat to human beings. In this research, a novel water-dispersible magnetic alginate/hydroxyapatite composite with high-efficiency Cd(II) adsorption performance was successfully synthesized by a facile wet-chemical method. The magnetic separation experiment and magnetic property analysis indicate that a magnetic alginate/hydroxyapatite composite can be effectively separated under a magnetic field. The zeta-potential result and dispersity experiment indicate that the lowest zeta-potential is –39.4 mV at pH = 5, and the obtained sample dispersed well in a Cd(II) solution after 120 min. The maximum adsorption capacity of a sample on Cd(II) is 135.3 mg g^–1 at pH = 5, and the adsorption of Cd(II) reached equilibrium in 10 min. The adsorption data could be fitted well using the Langmuir model, and the adsorption kinetic follows a pseudo-second-order kinetic model.

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