Plant tannin immobilized Fe3O4@SiO2 microspheres: A novel and green magnetic bio-sorbent with superior adsorption capacities for gold and palladium

Ruiyi Fan; Huiyu Min; Xingxing Hong; Qingping Yi; Wei Liu; Qinglin Zhang; Zhengrong Luo

doi:10.1016/j.jhazmat.2018.05.061

Plant tannin immobilized Fe₃O₄@SiO₂ microspheres: A novel and green magnetic bio-sorbent with superior adsorption capacities for gold and palladium

J Hazard Mater. 2019 Feb 15:364:780-790. doi: 10.1016/j.jhazmat.2018.05.061. Epub 2018 May 30.

Authors

Ruiyi Fan¹, Huiyu Min¹, Xingxing Hong¹, Qingping Yi², Wei Liu³, Qinglin Zhang⁴, Zhengrong Luo⁵

Affiliations

¹ Key Laboratory of Horticultural Plant Biology (MOE), Huazhong Agricultural University, Wuhan 430070, China.
² College of Bioengineering, Jingchu University of Technology, Jingmen 448000, China.
³ Nanomaterials and Nanotechnology Research Center (CINN), CSIC and University of Oviedo, San Martín del Rey Aurelio, 33940, Spain.
⁴ Key Laboratory of Horticultural Plant Biology (MOE), Huazhong Agricultural University, Wuhan 430070, China; Hubei Collaborative Innovation Center for the Characteristic Resources Exploitation of Dabie Mountains, Hubei Key Laboratory of Economic Forest Germplasm Improvement and Resources Comprehensive Utilization, Huanggang Normal University, Huanggang 438000, China.
⁵ Key Laboratory of Horticultural Plant Biology (MOE), Huazhong Agricultural University, Wuhan 430070, China; Hubei Collaborative Innovation Center for the Characteristic Resources Exploitation of Dabie Mountains, Hubei Key Laboratory of Economic Forest Germplasm Improvement and Resources Comprehensive Utilization, Huanggang Normal University, Huanggang 438000, China. Electronic address: luozhr@mail.hzau.edu.cn.

PMID: 30447562
DOI: 10.1016/j.jhazmat.2018.05.061

Abstract

In this paper, a new core-shell nanostructured magnetic bio-based composite was prepared by immobilizing persimmon tannin (PT) onto Fe₃O₄@SiO₂ microspheres, and the as designed Fe₃O₄@SiO₂@PT was utilized for adsorptive recovery of Au(III) and Pd(II). The preparation, morphology, composition and magnetic property of Fe₃O₄@SiO₂@PT were characterized. Adsorption parameters of Fe₃O₄@SiO₂@PT towards Au(III) and Pd(II) including initial pH, reaction time, initial concentration of metal ions, effect of acidity and interference of coexisting metal ions were investigated. It is sufficiently confirmed that silica was coated on Fe₃O₄ and persimmon tannin was immobilized on aminated Fe₃O₄@SiO₂. The thickness of silica and loaded persimmon tannin are around 18 nm and 14 nm, respectively. With only 1.00 wt% of persimmon tannin, however, the maximum adsorption capacities of Fe₃O₄@SiO₂@PT for Au(III) and Pd(II) were as high as 917.43 and 196.46 mg·g^-1, respectively. In addition, after adsorption of Au(III) and Pd(II), the magnetization saturation values (Ms) of Fe₃O₄@SiO₂@PT were high enough to guarantee efficient magnetic seperation. Metallic gold could be facilely recovered from wastewaters containing Au(III).

Keywords: Core-shell composite; Magnetic material; Natural polymer; Persimmon tannin; Precious metals.

Publication types

Research Support, Non-U.S. Gov't