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Open AccessArticle

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

1
Department of Civil and Environmental Engineering, Tokyo Institute of Technology, 2-12-1-M1-4 Ookayama, Tokyo 152-8552, Japan
2
Faculty of Hydrology and Water Resources Engineering, Institute of Technology of Cambodia, Phnom Penh 12156, Cambodia
3
Department of Chemistry, Northwestern University, Evanston, IL 60208, USA
4
Water and Wastewater Engineering Research Group, Institut Teknologi Bandung (ITB), Ganesha 10, Bandung 40132, Indonesia
5
Department of Environmental Engineering, Faculty of Engineering, Chulalongkorn University, Bangkok 10330, Thailand
6
Center of Excellence on Hazardous Substance Management, Chulalongkorn University, Bangkok 10330, Thailand
*
Author to whom correspondence should be addressed.
J. Compos. Sci. 2020, 4(2), 54; https://doi.org/10.3390/jcs4020054
Received: 26 April 2020 / Revised: 4 May 2020 / Accepted: 7 May 2020 / Published: 12 May 2020
(This article belongs to the Special Issue Graphene Oxide Composites)
Nanocomposites of UiO-66 and graphene oxide (UiO-66_GO) were prepared with different GO contents by a one-step hydrothermal method, and their photocatalytic activities for the degradation of carbamazepine (CBZ) were investigated under ranges of GO loading, catalyst dose, initial pollutant concentration, and solution pH. The UiO-66_GO nanocomposites showed photocatalytic rate constant up to 0.0136 min−1 for CBZ degradation and its high overall removal efficiency (>90%) in 2 h. The photocatalytic rate constant over the UiO-66_GO nanocomposite was about 2.8 and 1.7 times higher than those over pristine GO and UiO-66, respectively. The enhancement of photocatalytic activity by GO was attributed to increased surface area and porosity, improved light absorption, and narrowed band gap. The composite also showed substantial recyclability and stability over five consecutive cycles of photocatalytic degradation. The experimental results indicated that O2●− and OH are the responsible radicals for photocatalytic degradation, which helped us propose a photocatalytic mechanism for the enhanced CBZ photodegradation. This work provides a reference for the development of GO-based composite photocatalysts and expands the application of UiO-66 as a photocatalyst for the degradation of persistent micropollutants in water. View Full-Text
Keywords: carbamazepine; graphene oxide; metal–organic framework; photocatalysis; UiO-66 carbamazepine; graphene oxide; metal–organic framework; photocatalysis; UiO-66
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Heu, R.; Ateia, M.; Awfa, D.; Punyapalakul, P.; Yoshimura, C. Photocatalytic Degradation of Organic Micropollutants in Water by Zr-MOF/GO Composites. J. Compos. Sci. 2020, 4, 54.

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