Photocatalytic self-cleaning aminated C3N4/TiO2-PAN fibers for efficient treatment of dye wastewater

doi:10.1016/j.cjche.2025.06.030

中国化学工程学报 ›› 2025, Vol. 88 ›› Issue (12): 163-175.DOI: 10.1016/j.cjche.2025.06.030

Photocatalytic self-cleaning aminated C₃N₄/TiO₂-PAN fibers for efficient treatment of dye wastewater

Yapeng Zhu¹, Chenye Dai¹, Jian Lu¹, Wenbo Jiang¹, Yuqing Sun², Wenheng Jing¹

1. State Key Laboratory of Materials-Oriented Chemical Engineering, Nanjing Tech University, Nanjing 210009, China;
2. Hubei Key Laboratory for Efficient Utilization and Agglomeration of Metallurgic Mineral Resources, Wuhan University of Science and Technology, Wuhan 430081, China

收稿日期:2025-02-22 修回日期:2025-05-07 接受日期:2025-06-06 出版日期:2026-02-09 发布日期:2025-08-22
通讯作者: Yuqing Sun,E-mail:sunyuqing@wust.edu.cn;Wenheng Jing,E-mail:jingwh@njtech.edu.cn
基金资助:
This work was supported by the National Natural Science Foundation of China (22408161, 21921006), the National Key Research and Development Program (2021YFB3801303), the Key Research and Development Program of Jiangsu Provincial Department of Science and Technology (BE2022033-3), and the State Key Laboratory of Materials-Oriented Chemical Engineering (SKL-MCE-22A03).

Photocatalytic self-cleaning aminated C₃N₄/TiO₂-PAN fibers for efficient treatment of dye wastewater

Yapeng Zhu¹, Chenye Dai¹, Jian Lu¹, Wenbo Jiang¹, Yuqing Sun², Wenheng Jing¹

1. State Key Laboratory of Materials-Oriented Chemical Engineering, Nanjing Tech University, Nanjing 210009, China;
2. Hubei Key Laboratory for Efficient Utilization and Agglomeration of Metallurgic Mineral Resources, Wuhan University of Science and Technology, Wuhan 430081, China

Received:2025-02-22 Revised:2025-05-07 Accepted:2025-06-06 Online:2026-02-09 Published:2025-08-22
Contact: Yuqing Sun,E-mail:sunyuqing@wust.edu.cn;Wenheng Jing,E-mail:jingwh@njtech.edu.cn
Supported by:
This work was supported by the National Natural Science Foundation of China (22408161, 21921006), the National Key Research and Development Program (2021YFB3801303), the Key Research and Development Program of Jiangsu Provincial Department of Science and Technology (BE2022033-3), and the State Key Laboratory of Materials-Oriented Chemical Engineering (SKL-MCE-22A03).

摘要/Abstract

摘要： Polymer fibers are among the most promising adsorbents in wastewater treatment, while limited by poor adsorption capacity and irreversible pollution. Herein, amine-modified C₃N₄/TiO₂-polyacrylonitrile (PAN) composite fibers with high absorption ability and photocatalytic self-cleaning properties were fabricated via wet spinning. The introduction of diethylenetriamine (DETA) onto the PAN resulted in the presence of positively charged amino groups, which not only increased the number of adsorption sites for anionic dyes but also facilitated the formation of a sponge-like pore structure. Optimally, the adsorption capacity of the aminated PAN fibers (PD7h) for methyl orange (MO) reached 164.79 mg·g^-1, which is 39.2 times greater than that of unmodified PAN fibers. Furthermore, the introduction of the C₃N₄/TiO₂ heterojunction photocatalyst endowed the fibers with photocatalytic self-cleaning capability by generating active free radicals (hydroxyl radicals (·OH) and superoxide radicals (·O₂^-) that efficiently degraded dye pollutants in situ on the fiber surface. Under irradiation using a 300 W xenon lamp, the aminated C₃N₄/TiO₂-PAN fibers (PDCT-1) removed more than 90% of MO (30 mg·L^-1) within 120 min. After eight cycles, the pollutant removal rate decreased by only 22.41%, indicating excellent stability. Overall, this work presents an effective, simple and feasible method for preparing polymer fibers with high adsorption and photocatalytic self-cleaning properties via wet spinning for dye wastewater treatment.

关键词: Wet spinning, Aminated polyacrylonitrile fibers, Adsorption, Heterojunction, Photocatalytic regeneration

Abstract: Polymer fibers are among the most promising adsorbents in wastewater treatment, while limited by poor adsorption capacity and irreversible pollution. Herein, amine-modified C₃N₄/TiO₂-polyacrylonitrile (PAN) composite fibers with high absorption ability and photocatalytic self-cleaning properties were fabricated via wet spinning. The introduction of diethylenetriamine (DETA) onto the PAN resulted in the presence of positively charged amino groups, which not only increased the number of adsorption sites for anionic dyes but also facilitated the formation of a sponge-like pore structure. Optimally, the adsorption capacity of the aminated PAN fibers (PD7h) for methyl orange (MO) reached 164.79 mg·g^-1, which is 39.2 times greater than that of unmodified PAN fibers. Furthermore, the introduction of the C₃N₄/TiO₂ heterojunction photocatalyst endowed the fibers with photocatalytic self-cleaning capability by generating active free radicals (hydroxyl radicals (·OH) and superoxide radicals (·O₂^-) that efficiently degraded dye pollutants in situ on the fiber surface. Under irradiation using a 300 W xenon lamp, the aminated C₃N₄/TiO₂-PAN fibers (PDCT-1) removed more than 90% of MO (30 mg·L^-1) within 120 min. After eight cycles, the pollutant removal rate decreased by only 22.41%, indicating excellent stability. Overall, this work presents an effective, simple and feasible method for preparing polymer fibers with high adsorption and photocatalytic self-cleaning properties via wet spinning for dye wastewater treatment.

Key words: Wet spinning, Aminated polyacrylonitrile fibers, Adsorption, Heterojunction, Photocatalytic regeneration

Yapeng Zhu, Chenye Dai, Jian Lu, Wenbo Jiang, Yuqing Sun, Wenheng Jing. Photocatalytic self-cleaning aminated C₃N₄/TiO₂-PAN fibers for efficient treatment of dye wastewater[J]. 中国化学工程学报, 2025, 88(12): 163-175.

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Photocatalytic self-cleaning aminated C₃N₄/TiO₂-PAN fibers for efficient treatment of dye wastewater

Photocatalytic self-cleaning aminated C₃N₄/TiO₂-PAN fibers for efficient treatment of dye wastewater

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