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Persulfate activation using UiO-66 MOF: kinetics, optimization, and prediction for wastewater treatment
Victor Onwubiko1, Amal Abdelhaleem2, Emad A Elshehy3
1Nanoscience Program, Faculty of Basic and Applied Science, Egypt-Japan University of Science and Technology (E-JUST), New Borg El-Arab City Alexandria Egypt mohamed.elkhouly@ejust.edu.eg.
Abstract:
This study investigates the efficiency of UiO-66 photocatalyst as a novel activator for persulfate (PS) under UV-visible light irradiation (UV-Vis). The synergy between UiO-66 and PS effectively degraded methylene blue (MB), achieving a removal efficiency of 93.07% under optimized conditions. The photocatalytic reaction was elucidated by characterizing UiO-66 before and after photocatalysis using various techniques, including UV/Vis, HR-TEM, EDX, XRD, FTIR, and EIS. An RSM quadratic model was established and validated for predicting and optimizing the efficiency of the UiO-66/PS/UV-Vis process under various reaction conditions, such as [UiO-66], [MB]0, pHi, and [PS]0. The process maintained high degradation efficiency (>87%) across a pH range of 3.5-8.1, demonstrating its applicability under diverse pH conditions. Additionally, it achieved a high mineralization degree of 90.57%. A cost analysis estimated a feasible treatment cost of 5.98 USD/m3, making it suitable for industrial applications. Scavenging tests revealed that O2˙- species are the main reactive species in MB degradation, followed by h+, while SO4˙- and ˙OH have minor contributions. This research introduces UiO-66 as a novel PS activator under UV-Vis, aligning with United Nations Sustainable Development Goals (SDGs) 6, 14, 3, and 12. Overall, this study highlights the potential of the UiO-66/PS/UV-Vis process for sustainable wastewater treatment, providing insights into the degradation mechanism and pathways for performance optimization.
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