A novel PEI-grafted N-doping magnetic hydrochar for enhanced scavenging of BPA and Cr(VI) from aqueous phase

Jianhua Qu; Fuxuan Bi; Qi Hu; Peipei Wu; Boyu Ding; Yue Tao; Shouyi Ma; Chunrong Qian; Ying Zhang

doi:10.1016/j.envpol.2023.121142

A novel PEI-grafted N-doping magnetic hydrochar for enhanced scavenging of BPA and Cr(VI) from aqueous phase

Environ Pollut. 2023 Mar 15:321:121142. doi: 10.1016/j.envpol.2023.121142. Epub 2023 Jan 23.

Authors

Jianhua Qu¹, Fuxuan Bi¹, Qi Hu², Peipei Wu¹, Boyu Ding¹, Yue Tao¹, Shouyi Ma³, Chunrong Qian⁴, Ying Zhang⁵

Affiliations

¹ School of Resources and Environment, Northeast Agricultural University, Harbin 150030, China.
² School of Pharmaceutical Engineering, Shenyang Pharmaceutical University, Shenyang 110016, China.
³ Heilongjiang Academy of Land Reclamation Sciences, Harbin, 150030, China.
⁴ Institute of Crop Cultivation and Tillage, Heilongjiang Academy of Agricultural Sciences, Harbin, 150028, China.
⁵ School of Resources and Environment, Northeast Agricultural University, Harbin 150030, China. Electronic address: zhangying_neau@163.com.

PMID: 36702430
DOI: 10.1016/j.envpol.2023.121142

Abstract

Herein, polyethyleneimine (PEI)-grafted nitrogen-doping magnetic hydrochar (PEI_MW@MNHC) was synthesized for hexavalent chromium (Cr(VI)) and bisphenol A (BPA) elimination from water. Characterizations exhibited that abundant amino functional groups, intramolecular heterocyclic N, azo and Fe-N_X structures were successfully introduced into the inherent structure of hydrochar. The obtained PEI_MW@MNHC presented maximum uptake of 205.37 and 180.79 mg/g for Cr(VI) and BPA, respectively, and was highly tolerant to various co-existing ions. Mechanism investigation revealed that the protonated amino, intramolecular heterocyclic N and Fe(II) participated in Cr(VI) reduction, and the N/O-containing groups and Fe(III) fixed Cr(III) onto PEI_MW@MNHC by the formation of complexes and precipitates. On the other hand, azo, Fe-N_X and graphitic N structures contributed to the removal of BPA via pore filling, hydrogen bonding and π-π interactions. Additionally, PEI_MW@MNHC maintained over 85.0% removal efficiency for Cr(VI) and BPA after four cycles, manifesting that PEI_MW@MNHC was an ideal adsorbent with outstanding practical application potential.

Keywords: Adsorption; Heavy metal; N doping; Organic pollutant; PEI-Modification.

MeSH terms

Adsorption
Chromium / chemistry
Ferric Compounds
Hydrogen-Ion Concentration
Kinetics
Magnetic Phenomena
Polyethyleneimine* / chemistry
Water / chemistry
Water Pollutants, Chemical* / chemistry

Substances

chromium hexavalent ion
Polyethyleneimine
bisphenol A
Ferric Compounds
Water Pollutants, Chemical
Water
Chromium