Granular reduced graphene oxide/Fe3O4 hydrogel for efficient adsorption and catalytic oxidation of p-perfluorous nonenoxybenzene sulfonate

Wei Wang; Ying Cao; Xue Hu; Shuangxi Zhou; Donghai Zhu; Delin Qi; Shubo Deng

doi:10.1016/j.jhazmat.2019.121662

Granular reduced graphene oxide/Fe₃O₄ hydrogel for efficient adsorption and catalytic oxidation of p-perfluorous nonenoxybenzene sulfonate

J Hazard Mater. 2020 Mar 15:386:121662. doi: 10.1016/j.jhazmat.2019.121662. Epub 2019 Nov 15.

Authors

Wei Wang¹, Ying Cao², Xue Hu², Shuangxi Zhou², Donghai Zhu², Delin Qi², Shubo Deng³

Affiliations

¹ State Key Laboratory of Plateau Ecology and Agriculture, Qinghai University, Xi'Ning, Qinghai Province, 810016, China; State Key Joint Laboratory of Environment Simulation and Pollution Control (SKLESPC), Beijing Key Laboratory for Emerging Organic Contaminants Control, School of Environment, Tsinghua University, Beijing, 100084, China.
² State Key Laboratory of Plateau Ecology and Agriculture, Qinghai University, Xi'Ning, Qinghai Province, 810016, China.
³ State Key Joint Laboratory of Environment Simulation and Pollution Control (SKLESPC), Beijing Key Laboratory for Emerging Organic Contaminants Control, School of Environment, Tsinghua University, Beijing, 100084, China. Electronic address: dengshubo@tsinghua.edu.cn.

PMID: 31771885
DOI: 10.1016/j.jhazmat.2019.121662

Abstract

The catalytic performance of Fe₃O₄/reduced graphene oxide (Fe₃O₄/rGO) nanocomposite makes it attractive for the removal of emerging pollutants from water, but the combination of its efficient adsorption and degradation of per- and polyfluoroalkyl substances has not been studied. Here we report the optimal granular Fe₃O₄/rGO with high thermal and acid resistance stability through controlling its self-assembly for the adsorption and degradation of sodium p-perfluorous nonenoxybenzene sulfonate (OBS) from water. The maximum adsorption capacity for OBS was calculated to be 362.4 μmol/g according to Langmuir fitting. Electrostatic, π-π and hydrogen bonding interactions were involved in OBS adsorption, and the quaternary N in Fe₃O₄/rGO was a key adsorption site. The efficiency of the utilization of free radicals generated in Fenton-like and persulfate (PS) systems increased with the increase of OBS adsorbed onto the Fe₃O₄/rGO, while the increase of OBS amount adsorbed on Fe₃O₄/rGO would casue a slow OBS removal in the adsorption-degradation process due to the slow adsorption process. The Fenton-like oxidation was more efficient for OBS removal than PS oxidation. The spent Fe₃O₄/rGO was able to be reused in the Fenton-like system at least ten times, while the OBS removal in the PS reaction system was reduced to 47.8 % after six reuse cycles.

Keywords: Adsorption; Degradation; Fenton-like oxidation; OBS; Persulfate.

Publication types

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