Citation: Yifan Ren, Yanbiao Liu, Fuqiang Liu, Fang Li, Chensi Shen, Zhuangchun Wu. Extremely efficient electro-Fenton-like Sb(III) detoxification using nanoscale Ti-Ce binary oxide: An effective design to boost catalytic activity via non-radical pathway[J]. Chinese Chemical Letters, ;2021, 32(8): 2519-2523. doi: 10.1016/j.cclet.2021.02.007 shu

Extremely efficient electro-Fenton-like Sb(III) detoxification using nanoscale Ti-Ce binary oxide: An effective design to boost catalytic activity via non-radical pathway

Yifan Ren ^a ,
Yanbiao Liu ^{a, b, *,} ,
Fuqiang Liu ^a ,
Fang Li ^{a, b} ,
Chensi Shen ^{a, b} ,
Zhuangchun Wu ^c

a.
Textile Pollution Controlling Engineering Center of Ministry of Environmental Protection, College of Environmental Science and Engineering, Donghua University, Shanghai 201620, China
b.
Shanghai Institute of Pollution Control and Ecological Security, Shanghai 200092, China
c.
Institute of Functional Materials, Donghua University, Shanghai 201620, China

yanbiaoliu@dhu.edu.cn

Received Date: 8 December 2020
Revised Date: 6 January 2021
Accepted Date: 1 February 2021
Available Online: 4 February 2021

Figures(3)

Environmental risks posed by discharge of the emerging contaminant antimony (Sb) into water bodies have raised global concerns recently. The toxicity of Sb has been shown to be species-dependent, with Sb(III) demonstrating much greater toxicity than Sb(V). Here, we proposed an electrochemical filtration system to achieve rapid detoxification of Sb(III) via a non-radical pathway. The key to this technology was an electroactive carbon nanotube filter functionalized with nanoscale Ti-Ce binary oxide. Under an electric field, in situ generated H₂O₂ could react with the Ti-Ce binary oxide to produce hydroperoxide complexes, which enabled an efficient transformation of Sb(III) to the less toxic Sb(V) (τ < 2 s) at neutral pH. The impact of important operational parameters was assessed and optimized, and system efficacy could be maintained over a wide pH range and long-term operation. An optimum detoxification efficiency of > 90% was achieved using lake water spiked with Sb(III) at 500 μg/L. The results showed that Ti/Ce-hydroperoxo surface complexes were the dominant species responsible for the non-radical oxidation of Sb(III) based on extensive experimental evidences and advanced characterizations. This study provides a robust and effective strategy for the detoxification of water containing Sb(III) and other similar heavy metal ions by integrating state-of-the-art advanced oxidation processes, electrochemistry and nano-filtration technology.
- Sb(III) detoxification,
- Ti-Ce binary oxide,
- Electro-Fenton-like,
- Non-radical mechanism,
- Continuous flow
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