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In essence, uranium is required for nuclear energy generation in order to reach the carbon neutrality goal. In order to protect the environment, it also calls for a concentration on treating waste water that contains uranium. Among various uranium waste water processing techniques, adsorption is simple and effective. A large number of adsorbents have been used for this purpose. Schiff based COFs are considered as promising adsorbents in water treatment field. β-ketoenamine based covalent organic frameworks (COFs), are an important subclass of schiff based COFs used for adsorption of uranium from waste water. The solvothermal COFs synthesis route requires closed system, high temperature, high pressure, freeze pump thaw cycles, glass sealed tube apparatus, nitrogen atmosphere and long reaction time, and shows small scale production, which retard COFs usage in industrial applications. In this study, Co-60 gamma irradiation method with optimized absorbed dose (5 kGy) and dose rate (10 kGy/hr) is proposed to synthesize highly crystalline COF-HSO3 at room temperature with N2, which can help to get rid of the above mentioned problems of solvothermal method. To find the relationship between structure and properties, prepared adsorbent was characterized by various characterization techniques (PXRD, FTIR, SEM, XPS, BET, TGA etc.) being used in the uranium adsorption field. The gamma irradiation method COF-HSO3 was used in uranium adsorption studies for uranium removal from waste water. This is demonstrated that COF-HSO3 synthesized by gamma irradiation method showed adsorption capacity (Qe = 212 mg/g) comparable with that of the same COF prepared by solvo thermal method @ 120 °C in 24 h instead of 72 h without any freeze pump thaw cycle or sealed glass tube equipment. The kinetic studies were carried out and fitting on peuso first order and second order models was completed. The isothermal studies were carried out and fitting on langmuir and Freundlich models was completed. This work shall prove a significant contribution in the synthesis of COFs by gamma radiation method for adsorption of uranium from waste water.

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Synthesis of Covalent Organic Framework (COF-HSO3) by Gamma-Irradiation Method for Uranium Adsorption from Waste Water

  • 会议论文

  • 发表日期：

    2026年

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  • Abdullah,
  • Zhigang Li,
  • Fuqiu Ma

摘要

In essence, uranium is required for nuclear energy generation in order to reach the carbon neutrality goal. In order to protect the environment, it also calls for a concentration on treating waste water that contains uranium. Among various uranium waste water processing techniques, adsorption is simple and effective. A large number of adsorbents have been used for this purpose. Schiff based COFs are considered as promising adsorbents in water treatment field. β-ketoenamine based covalent organic frameworks (COFs), are an important subclass of schiff based COFs used for adsorption of uranium from waste water. The solvothermal COFs synthesis route requires closed system, high temperature, high pressure, freeze pump thaw cycles, glass sealed tube apparatus, nitrogen atmosphere and long reaction time, and shows small scale production, which retard COFs usage in industrial applications. In this study, Co-60 gamma irradiation method with optimized absorbed dose (5 kGy) and dose rate (10 kGy/hr) is proposed to synthesize highly crystalline COF-HSO3 at room temperature with N2, which can help to get rid of the above mentioned problems of solvothermal method. To find the relationship between structure and properties, prepared adsorbent was characterized by various characterization techniques (PXRD, FTIR, SEM, XPS, BET, TGA etc.) being used in the uranium adsorption field. The gamma irradiation method COF-HSO3 was used in uranium adsorption studies for uranium removal from waste water. This is demonstrated that COF-HSO3 synthesized by gamma irradiation method showed adsorption capacity (Qe = 212 mg/g) comparable with that of the same COF prepared by solvo thermal method @ 120 °C in 24 h instead of 72 h without any freeze pump thaw cycle or sealed glass tube equipment. The kinetic studies were carried out and fitting on peuso first order and second order models was completed. The isothermal studies were carried out and fitting on langmuir and Freundlich models was completed. This work shall prove a significant contribution in the synthesis of COFs by gamma radiation method for adsorption of uranium from waste water.