Silica-Based 1,3-Diphenyl-1,3-Propanedione Composites: Efficient Uranium Capture for Environmental Remediation

Author:

Al-Anber Mohammed A.12,Al-Qaisi Wala'1,Al-Momani Idrees F.3,Hijazi Ahmed K.4,Sobola Dinara56,Alhalasah Wasim7,Al-Anber Zaid A.8

Affiliation:

1. Inorganic and Polymeric Materials Laboratory, Department of Chemistry, Faculty of Sciences, Mutah University, P.O. Box 7, Al-Karak, 61710, Jordan

2. Prince Faisal Center for DeadSea, Environmental, and Energy Research, Mutah University, P.O. Box 7, 61710, Al-Karak, Jordan

3. Department of Chemistry, Faculty of Sciences, Yarmouk University, Irbid, Jordan

4. Department of Chemistry, Faculty of Science and Arts, Jordan University of Science and Technology, Irbid, Jordan

5. CEITEC BUT, Brno University of Technology, Brno 612 00, Czech Republic

6. Institute of Scientific Instruments of Czech Academy of Sciences, Brno, 612 64, Czech Republic

7. Scientific Research and Innovation Support Fund, Ministry of Higher Education and Scientific Research, Amman, Jordan

8. Chemical Engineering Department, Faculty of Engineering Technology, Al-Balqa Applied University, Amman, Jordan

Abstract

Introduction:: This study synthesizes and characterizes a novel hybrid composite, SGdpm, to capture UO2 2+ ions from water. The composite has successfully formed by hosting covalently diphenylmethane-1,3-dione (dpm) within an inorganic silica gel matrix, showing promising potential for environmental remediation and nuclear waste management. Methods:: The preparation involved the reaction of tetraethylorthosilicate (TEOS) with diphenylmethane- 1,3-dione (dpm) under acidic conditions, resulting in white solids. The doped composite was characterized by Fourier Transform Infrared Spectroscopy (FTIR), revealing the presence of siloxane and Si-O-C bonds. The application of SG-dpm for capturing UO2 2+ ions from water was investigated, showing a shift in FTIR peaks and confirming the formation of SG-dpm-UO2 2+ as inner-sphere complexes. Scanning Electron Microscopy (SEM) revealed a non-uniform distribution of particles, essential for consistent behavior in applications such as adsorption. Results and Discussion:: Batch sorption experiments demonstrated temperature-dependent sorption behavior with increased efficiency at higher temperatures (T = 55°C). The study also explored the influence of pH and initial concentration on UO2 2+ sorption, revealing optimal conditions at pH 5 and lower initial concentrations (1.0 mg L-1). Kinetic studies using pseudo-second-order models indicated a high efficiency of UO2 2+ ion removal (99%) as a chemisorption process. Intraparticle diffusion models highlighted three distinct sorption stages. Sorption isotherm studies favored the Langmuir model, emphasizing monolayer adsorption. The thermodynamic analysis suggested an endothermic (ΔH = + 16.120 kJ mol-1) and spontaneous (ΔG = −25.113 to − 29.2449 kJ mol-1) sorption process. Selectivity studies demonstrated high efficiency in capturing Cu2+, Co2+, and Cr3+ ions, high degree selectivity of UO2 2+ ions (74%), moderate efficiency for Fe3+ and Zn2+, and lower efficiency for Pb2+, Ni2+, and Cd2+, and poor efficiency for Mn2+ ions. Conclusion: SG-dpm exhibits promising potential for selective UO2 2+ ion removal, demonstrating favorable characteristics for various applications, including environmental remediation and nuclear waste management.

Publisher

Bentham Science Publishers Ltd.

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