Adsorption-catalytic synergistic Fenton degradation of potassium butyl xanthate in flotation tailing wastewater by renewable iron-loaded sludge: performance, kinetics and mechanism

Jiping Tang, Baolin Hou*, Zhi Li, Jinyue Liu, Zhenghua Wang, Jinkai Shu, Bozhi Ren, Chuang Wang, Renjian Deng, Yu Kuang, Andrew Hursthouse

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

The renewable iron-loaded residual sludge heterogeneous catalyst (RLS-Fe) was prepared by impregnation-pyrolysis method and applied to the heterogeneous Fenton for the degradation of potassium butyl xanthate (BX-K) in flotation tailing wastewater. The rich pore structure and uniformly distributed iron oxides endowed the catalyst with excellent adsorption and catalytic capabilities. RLS-Fe exhibited maximum adsorption capacity of 86.47 mg/g, with surface concentration (Cs) of 2.88 mg/cm2 and surface coverage (θ) exceeding 80 %. The interaction of monolayer-adsorbed BX-K with catalytically generated ·OH facilitated the Fenton reaction and enhanced the adsorption process, making the degradation and mineralization of BX-K more efficient, with the removal rate of 99.82 % in 80 min. Through the synergistic effects of adsorption and catalytic processes, H2O2 was efficiently decomposed and effectively utilized. The ·OH generated in the initial stage rapidly degraded the adsorbed BX-K and released the adsorption sites, while the ·O2 produced subsequently targeted the catalytic sites and restored their activity. The Langmuir-Hinshelwood (L-H) kinetic model confirmed that the mutual promotion of adsorption and catalysis elevated the apparent reaction rate constant and accelerated the mineralization of BX-K. Additionally, density functional theory (DFT), Fukui indices and Gibbs free energy calculations were employed to analyze the intermediates and degradation pathways of BX-K. The −C=S– bond was identified as the primary target for ·OH attack. The RLS-Fe catalyst prepared in this study presented excellent stability and renewability, offering new insights for the streamlined preparation of renewable catalysts and efficient treatment of tailings wastewater.
Original languageEnglish
Article number130533
Number of pages32
JournalSeparation & Purification Technology
Early online date13 Nov 2024
DOIs
Publication statusE-pub ahead of print - 13 Nov 2024

Keywords

  • heterogeneous Fenton
  • iron-loaded sludge
  • catalysis
  • adsorption
  • synergistic mechanisms
  • kinetics
  • renewability

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