Preparation of PrFexCo1-xO3/Mt catalyst and study on degradation of 2-hydroxybenzoic acid wastewater by catalytic wet peroxide oxidation

doi:10.1016/j.cjche.2023.08.006

摘要/Abstract

摘要： In this study, the perovskite nanocomposite PrFe_xCo_1-xO₃(Pr(S)) was successfully synthesized by the sol -gel method; PrFe_xCo_1-xO₃/Al-pillared montmorillonite (Pr(S)/Mt) catalysts were prepared by impregnation (D) method and solid-melting (G) method, respectively, with Pr(S) as the active component and Al-pillared montmorillonite as the carrier. The catalysts were applied to treat the 2-hydroxybenzoic acid (2-HA)-simulated wastewater by catalytic wet peroxide oxidation (CWPO) technique, and the chemical oxygen demand (COD) removal rate and the 2-HA degradation rate were used as indicators to evaluate the catalytic performance. The results of the experiment indicated that the solid-melting method was more conducive to preparing the catalyst when the Co/Fe molar ratio of 7:3 and the optimal structural properties of the catalysts were achieved. The influence of operating parameters, including reaction temperature, catalyst dosage, H₂O₂ dosage, pH, and initial 2-HA concentration, were optimized for the degradation of 2-HA by CWPO. The results showed that 97.64% of 2-HA degradation and 75.23% of COD removal rate were achieved under more suitable experimental conditions. In addition, after the catalyst was used five times, the degradation rate of 2-HA could still reach 76.93%, which implied the high stability and reusability of the catalyst. The high catalytic activity of the catalyst was due to the doping of Co into PrFeO₃, which could promote the generation of HO·, and the high stability could be attributed to the loading of Pr(S) onto Al-Mt, which reduced the leaching of reactive metals. The study of reaction mechanism and kinetics showed that the whole degradation process conformed to the pseudo-firs-torder kinetic equation, and the Langmuir-Hinshelwood method was applied to demonstrate that catalysis was dominant in the degradation process.

关键词: Montmorillonite, Perovskite, Catalytic wet peroxide oxidation (CWPO), 2-Hydroxybenzoic acid

Abstract: In this study, the perovskite nanocomposite PrFe_xCo_1-xO₃(Pr(S)) was successfully synthesized by the sol -gel method; PrFe_xCo_1-xO₃/Al-pillared montmorillonite (Pr(S)/Mt) catalysts were prepared by impregnation (D) method and solid-melting (G) method, respectively, with Pr(S) as the active component and Al-pillared montmorillonite as the carrier. The catalysts were applied to treat the 2-hydroxybenzoic acid (2-HA)-simulated wastewater by catalytic wet peroxide oxidation (CWPO) technique, and the chemical oxygen demand (COD) removal rate and the 2-HA degradation rate were used as indicators to evaluate the catalytic performance. The results of the experiment indicated that the solid-melting method was more conducive to preparing the catalyst when the Co/Fe molar ratio of 7:3 and the optimal structural properties of the catalysts were achieved. The influence of operating parameters, including reaction temperature, catalyst dosage, H₂O₂ dosage, pH, and initial 2-HA concentration, were optimized for the degradation of 2-HA by CWPO. The results showed that 97.64% of 2-HA degradation and 75.23% of COD removal rate were achieved under more suitable experimental conditions. In addition, after the catalyst was used five times, the degradation rate of 2-HA could still reach 76.93%, which implied the high stability and reusability of the catalyst. The high catalytic activity of the catalyst was due to the doping of Co into PrFeO₃, which could promote the generation of HO·, and the high stability could be attributed to the loading of Pr(S) onto Al-Mt, which reduced the leaching of reactive metals. The study of reaction mechanism and kinetics showed that the whole degradation process conformed to the pseudo-firs-torder kinetic equation, and the Langmuir-Hinshelwood method was applied to demonstrate that catalysis was dominant in the degradation process.

Key words: Montmorillonite, Perovskite, Catalytic wet peroxide oxidation (CWPO), 2-Hydroxybenzoic acid

Binxia Zhao, Yijia Gao, Tiancheng Hun, Xiaoxiao Fan, Nan Shao, Xiaoqian Chen. Preparation of PrFe_xCo_1-xO₃/Mt catalyst and study on degradation of 2-hydroxybenzoic acid wastewater by catalytic wet peroxide oxidation[J]. 中国化学工程学报, 2024, 65(1): 286-297.

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Preparation of PrFe_xCo_1-xO₃/Mt catalyst and study on degradation of 2-hydroxybenzoic acid wastewater by catalytic wet peroxide oxidation

Preparation of PrFe_xCo_1-xO₃/Mt catalyst and study on degradation of 2-hydroxybenzoic acid wastewater by catalytic wet peroxide oxidation

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