Studies on adsorption properties of magnetic composite prepared by one-pot method for Cd(II), Pb(II), Hg(II), and As(III): Mechanism and practical application in food

Yue Wang; Tamaki Nakano; Xi Chen; Yu-Long Xu; Ying-Jie He; Yan-Xiang Wu; Jie-Qiong Zhang; Wei Tian; Ming-Hui Zhou; Song-Xue Wang

doi:10.1016/j.jhazmat.2024.133437

Studies on adsorption properties of magnetic composite prepared by one-pot method for Cd(II), Pb(II), Hg(II), and As(III): Mechanism and practical application in food

J Hazard Mater. 2024 Mar 15:466:133437. doi: 10.1016/j.jhazmat.2024.133437. Epub 2024 Jan 9.

Authors

Yue Wang¹, Tamaki Nakano², Xi Chen¹, Yu-Long Xu³, Ying-Jie He⁴, Yan-Xiang Wu¹, Jie-Qiong Zhang¹, Wei Tian¹, Ming-Hui Zhou⁵, Song-Xue Wang¹

Affiliations

¹ Academy of National Food and Strategic Reserves Administration, Beijing 100037, China.
² l̥Institute for Catalysis (ICAT), Hokkaido University, N21W10, Kita-ku, Sapporo 001-0021, Japan.
³ Department of Applied Chemistry, College of Arts and Sciences, Northeast Agricultural University, Harbin 150030, China.
⁴ Academy of National Food and Strategic Reserves Administration, Beijing 100037, China; College of Food Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, China.
⁵ Academy of National Food and Strategic Reserves Administration, Beijing 100037, China. Electronic address: zmh@ags.ac.cn.

PMID: 38246063
DOI: 10.1016/j.jhazmat.2024.133437

Abstract

A one-pot synthesis afforded a magnetic, crosslinked polymer adsorbent (m-P6) with a variety of functional groups to realize simultaneous adsorption of Cd²⁺, Pb²⁺, Hg²⁺, and As³⁺. The material was characterized by TEM-EDS, XRD, FT-IR, VSM, and XPS. Kinetic and isothermal analyses suggested mainly chemisorption processes of heavy metal ions that form multiple layers on heterogeneous surfaces. Theoretical adsorption capacities calculated by a pseudo-2nd-order kinetic model and the Sips isothermal model were 282.88 mg/g for Cd²⁺, 326.18 mg/g for Pb²⁺, 117.85 mg/g for Hg²⁺, and 320.29 mg/g for As³⁺. m-P6 not only can efficiently adsorb divalent heavy metals (Cd²⁺, Pb²⁺, Hg²⁺), but also demonstrate a process of adsorption-driven catalytic oxidation by single-electron transfer (SET) from As³⁺ to As⁵⁺. In application, in addition to adsorption in water, m-P6 is capable of minimizing matrix interference, and extracting trace heavy metals in a complex environment (cereal) through easy operations for improving the detection accuracy, as well as it is potential for application in detection of trace heavy metals in foodstuffs. m-P6 can be readily regenerated and efficiently recycled for 5 cycles using eluent E12 and dilute acid.

Keywords: Heavy metals; Magnetic material; Matrix effect; Multiple-ion adsorption; Trace concentration.