Preparation of Mn-Ce oxide-loaded Al2O3 by citric acid-assisted impregnation for enhanced catalytic ozonation degradation of dye wastewater

doi:10.1016/j.cjche.2024.08.011

中国化学工程学报 ›› 2024, Vol. 76 ›› Issue (12): 237-250.DOI: 10.1016/j.cjche.2024.08.011

Preparation of Mn-Ce oxide-loaded Al₂O₃ by citric acid-assisted impregnation for enhanced catalytic ozonation degradation of dye wastewater

Shaopeng Li^1,2, Weichao Li^2,3, Yun Wu^1,2, Xianming Zheng^1,2, Xuehui Zhao^1,2, Ning Nan^1,2, Hongwei Zhang^1,2

1. School of Environmental Science and Engineering, TianGong University, Tianjin 300387, China;
2. State Key Laboratory of Separation Membranes and Membrane Processes, TianGong University, Tianjin 300387, China;
3. School of Material Science and Engineering, TianGong University, Tianjin 300387, China

收稿日期:2024-06-03 修回日期:2024-08-24 接受日期:2024-08-25 出版日期:2024-12-28 发布日期:2024-10-05
通讯作者: Yun Wu,E-mail:wucloud@163.com
基金资助:
This work was supported by the National Key Research and Development Program (2023YFC3207003) and the National Natural Science Foundation of China (51878448). We also thank the Analytical and Testing Center of Tiangong University for their assistance in the catalyst's characterization.

Preparation of Mn-Ce oxide-loaded Al₂O₃ by citric acid-assisted impregnation for enhanced catalytic ozonation degradation of dye wastewater

Shaopeng Li^1,2, Weichao Li^2,3, Yun Wu^1,2, Xianming Zheng^1,2, Xuehui Zhao^1,2, Ning Nan^1,2, Hongwei Zhang^1,2

1. School of Environmental Science and Engineering, TianGong University, Tianjin 300387, China;
2. State Key Laboratory of Separation Membranes and Membrane Processes, TianGong University, Tianjin 300387, China;
3. School of Material Science and Engineering, TianGong University, Tianjin 300387, China

Received:2024-06-03 Revised:2024-08-24 Accepted:2024-08-25 Online:2024-12-28 Published:2024-10-05
Contact: Yun Wu,E-mail:wucloud@163.com
Supported by:
This work was supported by the National Key Research and Development Program (2023YFC3207003) and the National Natural Science Foundation of China (51878448). We also thank the Analytical and Testing Center of Tiangong University for their assistance in the catalyst's characterization.

摘要/Abstract

摘要： The performance of supported catalysts is significantly affected by the dispersion degree of the active components on the support. In this study, citric acid (CA) was used as a modifier to prepare Al₂O₃ supported Mn-Ce oxides (Mn-Ce/CA-Al₂O₃) by the impregnation-calcination method. The characterization results showed that adding citric acid enhanced the dispersion of Mn-Ce oxides on the support, rendering Mn-Ce/CA-Al₂O₃ with a larger specific surface area and abundant surface hydroxyl groups, thereby providing more reaction sites for catalytic ozonation. The Mn-Ce/CA-Al₂O₃ exhibited excellent catalytic ozonation performance in degrading Reactive Black 5 (RB5) dye. It achieved nearly complete decolorization of RB5 within 60 min, with a COD removal efficiency of 60%, which was superior to the sole ozonation (30%). Furthermore, the Mn-Ce/CA-Al₂O₃ system demonstrated significant degradation of RB5 over a wide pH range of 3-11. Based on the XPS and EPR analysis results, a preliminary mechanism of catalytic ozonation over the Mn-Ce/CA-Al₂O₃ was proposed. The redox cycle of Mn³⁺/Mn⁴⁺ and Ce³⁺/Ce⁴⁺ effectively accelerated the electron transfer process, thus promoting the generation of reactive oxygen species (ROS) and improving the degradation of RB5. Meanwhile, the Mn-Ce/CA-Al₂O₃ exhibited superior catalytic stability and effective treatment capabilities for real dye wastewater.

关键词: Catalytic ozonation, Alumina-based catalyst, Mn-Ce oxides, Reactive Black 5, Reaction mechanism

Abstract: The performance of supported catalysts is significantly affected by the dispersion degree of the active components on the support. In this study, citric acid (CA) was used as a modifier to prepare Al₂O₃ supported Mn-Ce oxides (Mn-Ce/CA-Al₂O₃) by the impregnation-calcination method. The characterization results showed that adding citric acid enhanced the dispersion of Mn-Ce oxides on the support, rendering Mn-Ce/CA-Al₂O₃ with a larger specific surface area and abundant surface hydroxyl groups, thereby providing more reaction sites for catalytic ozonation. The Mn-Ce/CA-Al₂O₃ exhibited excellent catalytic ozonation performance in degrading Reactive Black 5 (RB5) dye. It achieved nearly complete decolorization of RB5 within 60 min, with a COD removal efficiency of 60%, which was superior to the sole ozonation (30%). Furthermore, the Mn-Ce/CA-Al₂O₃ system demonstrated significant degradation of RB5 over a wide pH range of 3-11. Based on the XPS and EPR analysis results, a preliminary mechanism of catalytic ozonation over the Mn-Ce/CA-Al₂O₃ was proposed. The redox cycle of Mn³⁺/Mn⁴⁺ and Ce³⁺/Ce⁴⁺ effectively accelerated the electron transfer process, thus promoting the generation of reactive oxygen species (ROS) and improving the degradation of RB5. Meanwhile, the Mn-Ce/CA-Al₂O₃ exhibited superior catalytic stability and effective treatment capabilities for real dye wastewater.

Key words: Catalytic ozonation, Alumina-based catalyst, Mn-Ce oxides, Reactive Black 5, Reaction mechanism

Shaopeng Li, Weichao Li, Yun Wu, Xianming Zheng, Xuehui Zhao, Ning Nan, Hongwei Zhang. Preparation of Mn-Ce oxide-loaded Al₂O₃ by citric acid-assisted impregnation for enhanced catalytic ozonation degradation of dye wastewater[J]. 中国化学工程学报, 2024, 76(12): 237-250.

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Preparation of Mn-Ce oxide-loaded Al₂O₃ by citric acid-assisted impregnation for enhanced catalytic ozonation degradation of dye wastewater

Preparation of Mn-Ce oxide-loaded Al₂O₃ by citric acid-assisted impregnation for enhanced catalytic ozonation degradation of dye wastewater

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