Citation: Chang Xu, Mengfan Luo, Jia Zhao, Jialong Yin, Can Feng, Heng Zhang, Peng Zhou, Zhaokun Xiong, Bo Lai. Ferrate(Ⅵ) combined with sulfur(Ⅳ) as an effective process for aromatic organoarsenic degradation: Essential role of Fe(Ⅲ) flocs[J]. Chinese Chemical Letters, ;2026, 37(4): 111538. doi: 10.1016/j.cclet.2025.111538 shu

Ferrate(Ⅵ) combined with sulfur(Ⅳ) as an effective process for aromatic organoarsenic degradation: Essential role of Fe(Ⅲ) flocs

Chang Xu ^{a, b} ,
Mengfan Luo ^{a, b} ,
Jia Zhao ^{a, b} ,
Jialong Yin ^{a, b} ,
Can Feng ^{a, b} ,
Heng Zhang ^{a, b, *,} ,
Peng Zhou ^{a, b} ,
Zhaokun Xiong ^{a, b} ,
Bo Lai ^{a, b, c}

a.
State Key Laboratory of Hydraulics and Mountain River Engineering, College of Architecture and Environment, Sichuan University, Chengdu 610065, China
b.
Sino-German Centre for Water and Health Research, Sichuan University, Chengdu 610065, China
c.
Key Laboratory of Jiangxi Province for Persistent Pollutants Prevention Control and Resource Reuse, Nanchang Hangkong University, Nanchang 330063, China

zhangheng01@scu.com

Received Date: 18 April 2025
Revised Date: 6 May 2025
Accepted Date: 2 July 2025
Available Online: 3 July 2025

Figures(6)

This study employed the ferrate(Ⅵ)/sulfur(Ⅳ) (Fe(Ⅵ)/S(Ⅳ)) system to degrade aromatic organoarsenic compounds, with a focus on elucidating the role of in situ-formed Fe(Ⅲ) flocs. The introduction of S(Ⅳ) significantly enhanced oxidative degradation efficiency compared to Fe(Ⅵ) alone, achieving 94.8% p-arsanilic acid (p-ASA) degradation within 3 min. The evolution of active species under varying S(Ⅳ) dosages was systematically investigated via radical quenching experiments and probe compound analysis. SO₄^•−, ^•OH and Fe(Ⅳ)/Fe(Ⅴ) were identified as the dominant reactive species in the Fe(Ⅵ)/S(Ⅳ) system, with Fe(Ⅳ)/Fe(Ⅴ) serving as the primary driver of p-ASA degradation. Characterization revealed that Fe(Ⅲ) flocs contributed to arsenic (As) adsorption. While S(Ⅳ) addition altered the morphology and structure of Fe(Ⅲ) flocs, these changes exerted negligible effects on As adsorption capacity. A plausible degradation pathway for p-ASA was proposed, supported by density functional theory (DFT) calculations and degradation product analysis. The system demonstrated robust resistance to common interfering ions, while the low toxicity of degradation byproducts highlighted its potential as a sustainable technology for AOCs elimination. This work elucidated structural modifications in Fe(Ⅲ) flocs induced by S(Ⅳ) and underscored the pivotal role of Fe(Ⅳ)/Fe(Ⅴ), positioning the Fe(Ⅵ)/S(Ⅳ) system as a promising strategy for AOCs degradation.
- Ferrate(Ⅵ),
- Sulfur(Ⅳ),
- High-valent iron,
- Adsorption,
- Fe(Ⅲ) flocs
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