Visible light photocatalytic degradation of MB using UiO-66/g-C3N4 heterojunction nanocatalyst. (December 2018)

• Record Type: Journal Article
• Authors: Zhang, Ying; Zhou, Jiabin; Feng, Qinqin; Chen, Xin; Hu, Zeshu
• Is Part Of: Chemosphere. Volume 212(2018)
• Page Start: 523
• Page End: 532
• Publication Date: 2018-12
• Subjects: Zirconium metal-organic frameworks -- G-C3N4 nanosheet -- Heterojunction -- Photocatalysis -- Methylene blue; Pollution -- Periodicals; Pollution -- Physiological effect -- Periodicals; Environmental sciences -- Periodicals; Atmospheric chemistry -- Periodicals; 551.511
• DOI: 10.1016/j.chemosphere.2018.08.117
• Languages: English
• ISSNs: 0045-6535

Abstract

Abstract: A unique hybrid of Zr-based metal-organic framework (UiO-66) with graphitic carbon nitride (g-C3 N4 ) nanosheets was synthesized by a facile annealing method. Photocatalytic effect was measured by the photodegradation of methylene blue (MB) under visible light irradiation. The morphology, structure, and porous properties of the as-synthesized composites were characterized by using transmission electron microscopy (TEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), the thermogravimetric and differential scanning calorimetry analysis (TG-DSC), diffuse reflectance UV–vis spectroscopy (UV–vis DRS), photoluminescence (PL), and N2 sorption-desorption isotherms (BET). The results showed that about 100% of MB (200 mL of 10 mg L −1 ) photodegradation was achieved by the UiO-66/g-C3 N4 hybrids (UC 10:10) in 240 min under visible light. The enhanced photocatalytic activity could be attributed to the heterojunction between UiO-66 and g-C3 N4 therefore the photoelectron transfers efficiently from the conduction band (CB) of g-C3 N4 to the CB of UiO-66 through the inner electric field generated by the heterojunction resulting the decreasing of recombination of electron/hole and the porous structures which enhance adsorption of the dye molecules on the catalyst surface thereby facilitates the electron/hole transfer within the framework. The trapping experiment and electron spin resonance (ESR) results showed that superoxide radicals (O2 − ) was the main oxidative species in the photodegradation of MB and the enhanced photocatalytic mechanism of UiO-66/g-C3 N4 heterojunction hybrids was also proposed. Highlights: UiO-66/g-C3 N4 nanocatalyst was synthesized by annealing method. It exhibits excellent photocatalytic degradation of MB in visible light. Superoxide radicals were the dominant reactive oxidative species.