Advanced solar photo-Fenton-like process with directly growing nano-heterojunctions on graphite fiber felt for phenolic wastewater treatment :Synergistically expand the pH activity range and facilitate the Fe(III)/Fe(II) cycle

Qianying Zong; Xiaofei Niu; Xin Cheng; Yifan Liu; Cong Liu; Tingyue Shi; Jiapeng Liu; Xiaohong Yang; Wentao Wang; Zikuan Guo; Fengjuan Xiao

doi:10.1016/j.chemosphere.2024.143980

Advanced solar photo-Fenton-like process with directly growing nano-heterojunctions on graphite fiber felt for phenolic wastewater treatment :Synergistically expand the pH activity range and facilitate the Fe(III)/Fe(II) cycle

Chemosphere. 2024 Dec 17:143980. doi: 10.1016/j.chemosphere.2024.143980. Online ahead of print.

Authors

Affiliations

¹ School of Materials Science and Engineering, Shijiazhuang Tiedao University, Hebei Key Laboratory of New Materials for Collaborative Development of Traffic Engineering and Environment.
² School of Materials Science and Engineering, Shijiazhuang Tiedao University, Hebei Key Laboratory of New Materials for Collaborative Development of Traffic Engineering and Environment. Electronic address: [email protected].

PMID: 39701313
DOI: 10.1016/j.chemosphere.2024.143980

Abstract

Nanoscale FeWO₄/BiVO₄ heterojunctions were directly grown on the graphite fiber felt (GF) with good conductivity to construct a FeWO₄/BiVO₄ @GF solar photo-Fenton like wastewater treatment system. The removal effect of COD from phenolic wastewater and the mechanism of synergistic improvement of wastewater treatment efficiency by this system were investigated. The FeWO₄/BiVO₄ heterojunction prepared by hydrothermal method exhibited higher photoelectric conversion efficiency and solar light utilization rate, thus endowing FeWO₄/BiVO₄ with excellent solar-Fenton like reaction activity.The photo-Fenton activity can be maintained well even within the pH range of 2-8. Loading FeWO₄/BiVO₄ nano-heterojunction on GF helped to increase the contact area between Fenton reagents and wastewater, facilitate the electron transfer on the FeWO₄/BiVO₄ heterojunction and enable the recovery and reuse of the Fenton reagents.Under solar light radiation, the COD removal efficiency of FeWO₄/BiVO₄ @GF/H₂O₂ system in phenolic wastewater was more than 92%. Even after five cycles, the system still exhibited excellent operation stability. FeWO₄/BiVO₄@GF promoted the conversion and cycling of Fe(III)/Fe(II) by accelerating the separation and transport of photogenerated electrons/holes and increasing the concentration of active species, thereby stimulating excellent solar photo-Fenton like activity.The results are significance to the development of green and efficient photo-Fenton process for advanced treatment of industrial wastewater.

Keywords: Fe(III)/Fe(II) cycle; FeWO(4)/BiVO(4) heterojunctions; energy-saving wastewater treatment process; graphite fiber felt; pH activity range; solar photo-Fenton like activity.