Citation: Shen Bin, Dong Chencheng, Ji Jiahui, Xing Mingyang, Zhang Jinlong. Efficient Fe(Ⅲ)/Fe(Ⅱ) cycling triggered by MoO₂ in Fenton reaction for the degradation of dye molecules and the reduction of Cr(Ⅵ)[J]. Chinese Chemical Letters, ;2019, 30(12): 2205-2210. doi: 10.1016/j.cclet.2019.09.052 shu

Efficient Fe(Ⅲ)/Fe(Ⅱ) cycling triggered by MoO₂ in Fenton reaction for the degradation of dye molecules and the reduction of Cr(Ⅵ)

Key Laboratory for Advanced Materials and Joint International Research Laboratory of Precision Chemistry and Molecular Engineering, Feringa Nobel Prize Scientist Joint Research Center, School of Chemistry and Molecular Engineering, East China University of Science and Technology, Shanghai 200237, China

mingyangxing@ecust.edu.cn

jlzhang@ecust.edu.cn

Received Date: 20 July 2019
Revised Date: 25 September 2019
Accepted Date: 27 September 2019
Available Online: 30 December 2019

Figures(3)

There is a relatively low efficiency of Fe(Ⅲ)/Fe(Ⅱ) conversion cycle and H₂O₂ decomposition (< 30%) in conventional Fenton process, which further results in a low production efficiency of ^·OH and seriously restricts the application of Fenton. Herein, we report that the commercial MoO₂ can be used as the cocatalyst in Fenton process to dramatically accelerate the oxidation of Lissamine rhodamine B (L-RhB), where the efficiency of Fe(Ⅲ)/Fe(Ⅱ) cycling is greatly enhanced in the Fenton reaction meanwhile. And the L-RhB solution could be degraded nearly 100% in 1 min in the MoO₂ cocatalytic Fenton system under the optimal reaction condition, which is apparently better than that of the conventional Fenton system (~50%). Different from the conventional Fenton reaction where the ^·OH plays an important role in the oxidation process, it shows that ¹O₂ contributes most in the MoO₂ cocatalytic Fenton reaction. However, it is found that the exposed Mo⁴⁺ active sites on the surface of MoO₂ powders can greatly promote the rate-limiting step of Fe³⁺/Fe²⁺ cycle conversion, thus minimizing the dosage of H₂O₂ (0.400 mmol/L) and Fe²⁺ (0.105 mmol/L). Interestingly, the MoO₂ cocatalytic Fenton system also exhibits a good ability for reducing Cr(Ⅵ) ions, where the reduction ability for Cr(Ⅵ) reaches almost 100% within 2 h. In short, this work shows a new discovery for MoO₂ cocatalytic advanced oxidation processes (AOPs), which devotes a lot to the practical water remediation application.
- Fenton reaction,
- Co-catalytic,
- Molybdenum dioxide,
- Fe³⁺/Fe²⁺ conversion,
- Dye wastewater
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Efficient Fe(Ⅲ)/Fe(Ⅱ) cycling triggered by MoO2 in Fenton reaction for the degradation of dye molecules and the reduction of Cr(Ⅵ)

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通讯作者: 陈斌, bchen63@163.com

Efficient Fe(Ⅲ)/Fe(Ⅱ) cycling triggered by MoO₂ in Fenton reaction for the degradation of dye molecules and the reduction of Cr(Ⅵ)