Photocatalytic Degradation of Organic Micropollutants in Water by Zr-MOF/GO Composites

Heu, Rina; Ateia, Mohamed; Awfa, Dion; Punyapalakul, Patiparn; Yoshimura, Chihiro

doi:10.3390/jcs4020054

Cited by 23 publications

(16 citation statements)

References 65 publications

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“…The presence of oxygen-containing functional group on the surface of GO could act as adsorption and active sites for catalysis. Heu et al combined GO alongside UiO-66 (a zirconium-based MOF with notably excellent thermal and chemical stability) creating GO@UiO-66 nanocomposite, and investigated its efficiency in degrading carbamazepine in the UV-visible region [ 98 ]. The composite can perform in a wide range of pH, displaying good stability in both extreme acidic (pH 2) and basic (pH 10) environment.…”

Section: Specific Improvement Strategies Related To Each Role Of Metal-organic Framework In Wastewater Treatmentmentioning

confidence: 99%

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Recent Improvement Strategies on Metal-Organic Frameworks as Adsorbent, Catalyst, and Membrane for Wastewater Treatment

et al. 2021

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The accumulation of pollutants in water is dangerous for the environment and human lives. Some of them are considered as persistent organic pollutants (POPs) that cannot be eliminated from wastewater effluent. Thus, many researchers have devoted their efforts to improving the existing technology or providing an alternative strategy to solve this environmental problem. One of the attractive materials for this purpose are metal-organic frameworks (MOFs) due to their superior high surface area, high porosity, and the tunable features of their structures and function. This review provides an up-to-date and comprehensive description of MOFs and their crucial role as adsorbent, catalyst, and membrane in wastewater treatment. This study also highlighted several strategies to improve their capability to remove pollutants from water effluent.

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Section: Specific Improvement Strategies Related To Each Role Of Metal-organic Framework In Wastewater Treatmentmentioning

confidence: 99%

“…Figure 6. Schematic diagram highlighting the synergistical mechanism behind GO@UiO-66 nanocomposite, with GO as adsorbent, electron acceptor and band gap reductor to UiO-66, enhancing its efficiency as the active component in catalysis[98], Copyright (2020) MDPI.…”

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confidence: 99%

Recent Improvement Strategies on Metal-Organic Frameworks as Adsorbent, Catalyst, and Membrane for Wastewater Treatment

et al. 2021

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“…Recently, oriented MOF-based graphene composites have been extensively studied for photocatalytic applications. For example, Heu et al prepared UiO−66/GO composites for photocatalytic degradation of organic micropollutants [ 61 ]. Although the UiO−66 orientation was not mentioned, the XRD pattern in Figure 9 a shows the orientation of UiO−66 in the presence of GO was toward [200], as shown by the previously reported data [ 62 ].…”

Section: Applications Of Mof/go Compositesmentioning

confidence: 99%

The Growth of Metal–Organic Frameworks in the Presence of Graphene Oxide: A Mini Review

et al. 2022

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Integrated metal–organic frameworks (MOFs) with graphene oxide (GO) have aroused huge interest in recent years due to their unique properties and excellent performance compared to MOFs or GO alone. While a lot of attention has been focused on the synthesis methodologies and the performance analysis of the composite materials in recent years, the fundamental formation/crystallization mechanism(s) is (are) still not fully understood. Ascribed to the distinctive structural and functional properties of GO, the nucleation and crystallization process of MOFs could be altered/promoted, forming MOF/GO composite materials with different nanostructures. Furthermore, the MOF’s parental structure could also influence how the GO and MOF bond together. Thus, this short review attempted to provide critical and indepth discussions of recent research results with a particular focus on the factors that influence the directional growth of parent MOFs in the presence of graphene oxide. Due to the unique structure and enhanced properties, the derived MOF/GO composites have a wide range of applications including gas separation, electrochemistry, and photocatalysis. We hope this review will be of interest to researchers working on MOF design, crystal structure control (e.g., orientation), and composite materials development.

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“…•− and •OH [33]. The contributions of the separate reactive species for pollutant removal can be identified using specific scavengers.…”

Section: The Role Of Reactive Species In the Degradation Mechanismsmentioning

confidence: 99%

Do Gas Nanobubbles Enhance Aqueous Photocatalysis? Experiment and Analysis of Mechanism

Chen

Ateia

et al. 2021

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The performance of photocatalytic advanced oxidation must be improved in order for the technology to make the jump from academic research to widespread use. Research is needed on the factors that cause photocatalysis to become self-limiting. In this study, we introduced, for the first time, nanobubbles continuously into a running photocatalytic reactor. Synthetic air, O2, and N2 bubbles in the size range of 40 to 700 nm were added to a reaction system comprising P25 TiO2 photocatalyst in stirred aqueous solution excited by UV-A lamps, with methyl orange as a target contaminant. The removal of methyl orange was tested under conditions of changing pH and with the addition of different radical scavengers. Results indicated that the oxygen and air nanobubbles improved the photocatalytic degradation of methyl orange—the removal efficiency of methyl orange increased from 58.2 ± 3.5% (N2 aeration) to 71.9 ± 0.6% (O2 aeration). Dissolved oxygen (DO) of 14.93 ± 0.13 mg/L was achieved using O2 nanobubbles in comparison to 8.43 ± 0.34 mg/L without aeration. The photodegradation of methyl orange decreased from 70.8 ± 0.4% to 53.9 ± 0.5% as pH increased from 2 to 10. Experiments using the scavengers showed that O2− was the main reactive species in photocatalytic degradation under highly dissolved oxygen conditions, which also accounted for the observation that the removal efficiency for methyl orange decreased at higher pH. However, without photocatalyst, nanobubbles alone did not improve the removal of methyl orange, and nanobubbles also did not increase the degradation of methyl orange by only photolysis. These experiments show that oxygen and air nanobubbles can act as environmentally friendly catalysts for boosting the performance of photocatalytic water treatment systems.

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Photocatalytic Degradation of Organic Micropollutants in Water by Zr-MOF/GO Composites

Cited by 23 publications

References 65 publications

Recent Improvement Strategies on Metal-Organic Frameworks as Adsorbent, Catalyst, and Membrane for Wastewater Treatment

Recent Improvement Strategies on Metal-Organic Frameworks as Adsorbent, Catalyst, and Membrane for Wastewater Treatment

The Growth of Metal–Organic Frameworks in the Presence of Graphene Oxide: A Mini Review

Do Gas Nanobubbles Enhance Aqueous Photocatalysis? Experiment and Analysis of Mechanism

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