Preparation of Mn-Ce oxide-loaded Al<sub>2</sub>O<sub>3</sub> by citric acid-assisted impregnation for enhanced catalytic ozonation degradation of dye wastewater

Shaopeng Li; Weichao Li; Yun Wu; Xianming Zheng; Xuehui Zhao; Ning Nan; Hongwei Zhang

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

Updated：2026-01-06

- 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
- 中国化学工程学报（英文版） 2024年76卷第12期页码：237-250
- Affiliations：
  
  1. School of Environmental Science and Engineering, TianGong University,Tianjin,China,300387
  2. State Key Laboratory of Separation Membranes and Membrane Processes, TianGong University,Tianjin,China,300387
  3. School of Material Science and Engineering, TianGong University,Tianjin,China,300387
- Author bio：
- Funds：
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- 纸质出版：2024
- Accepted：
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Shaopeng Li, Weichao Li, Yun Wu, 等. 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（英文版）, 2024,76(12):237-250.

O
Shaopeng Li, Weichao Li, Yun Wu, 等. 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（英文版）, 2024,76(12):237-250. DOI：

O DOI：

摘要

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 Al

supported Mn-Ce oxides (Mn-Ce/CA-Al

) 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-Al

with a larger specific surface area and abundant surface hydroxyl groups

thereby providing more reaction sites for catalytic ozonation. The Mn-Ce/CA-Al

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-Al

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-Al

was proposed. The redox cycle of Mn

/Mn

and Ce

/Ce

effectively accelerated the electron transfer process

thus promoting the generation of reactive oxygen species (ROS) and improving the degradation of RB5. Meanwh

ile

the Mn-Ce/CA-Al

exhibited superior catalytic stability and effective treatment capabilities for real dye wastewater.

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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