2-Methylimidazole-modulated UiO-66 as an effective photocatalyst to degrade Rhodamine B under visible light
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2-Methylimidazole-modulated UiO-66 as an effective photocatalyst to degrade Rhodamine B under visible light Zhaohua Li1, Rui Hu1,* 1
, Shuai Ye1, Jun Song1, Liwei Liu1, and Junle Qu1
Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, People’s Republic of China
Received: 18 May 2020
ABSTRACT
Accepted: 16 August 2020
We report herein a versatile new approach for improving the photodegradation performance of UiO-66 by introducing 2-methylimidazole through a straightforward in situ one-pot solvothermal method. The resultant complex UiO-66-M0.7 has demonstrated a reaction rate constant of 0.0183 min-1 in the photodegradation of rhodamine B under visible light, which is 69.4% higher than that with unmodulated UiO-66. Further investigation has confirmed that the improved activity can be attributed to enhanced adsorption of the dye by the photocatalyst during the adsorption–desorption equilibrium. The main active species involved in the photodegradation process have been identified as h? and O2-. In addition, the complex has shown ideal stability in recycling tests and excellent activity in the degradation of methylene blue. This study provides a novel perspective for the future design of various photocatalysts with superior performance.
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Springer Science+Business
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Handling Editor: Mark Bissett.
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https://doi.org/10.1007/s10853-020-05267-1
J Mater Sci
GRAPHIC ABSTRACT 2-Methylimidazole-modulated UiO-66 exhibits increased catalytic performance in the photodegradation of rhodamine B (RhB) under visible light because of enhanced adsorption of RhB on the catalyst during the adsorption-desorption equilibrium.
Introduction Water contamination is a severe environmental problem for humans. Among a variety of techniques that are used to remove organic pollutants, metal oxide/semiconductor-based photodegradation is considered a very promising strategy since organic pollutants can be directly degraded into CO2 and H2O as final products [1–3]. Metal oxides/semiconductors have richly diverse morphologies and structures, variable valence states, and adjustable oxygen vacancy concentrations, providing broad scope for designing new materials with unique properties. Among numerous methods for preparing metal oxide nanoparticles, the use of plant extracts has received wide attention in recent years because of its simplicity, low cost, short reaction times, and the ability to produce nanoparticles with well-defined sizes and morphologies on a large scale [4, 5]. Due to their facile formation and multifunctional behavior, metal oxides have been widely studied for various applications, such as sensors, catalysis, energy storage, electrochemistry, and environmental remediation [6–8]. One of the most important applications is the photocatalytic degradation of organic pollutants,
including dyes, pesticide
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