Enhanced photodegradation activity of methyl orange over Z-scheme type MoO3–g-C3N4 composite under visible light irradiation

Content Provider	Semantic Scholar
Author	He, Yiming Zhang, Lihong Wang, Xiaoxing Wu, Ying Lin, Hongjun Zhao, Leihong Weng, Weizheng Wan, Huilin Fan, Maohong
Copyright Year	2014
Abstract	Novel Z-scheme type MoO3–g-C3N4 composites photocatalysts were prepared with a simple mixing–calcination method, and evaluated for their photodegradation activities of methyl orange (MO). The optimized MoO3–g-C3N4 photocatalyst shows a good activity with a kinetic constant of 0.0177 min−1, 10.4 times higher than that of g-C3N4. Controlling various factors (MoO3–g-C3N4 amount, initial MO concentration, and pH value of MO solution) can lead to the enhancement of the photocatalytic activity of the composite. Only MoO3 and g-C3N4 are detected with X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FT-IR) spectra. N2 adsorption and UV-vis diffuse reflectance spectroscopy (DRS) results suggest that the addition of MoO3 slightly affects the specific surface area and the photoabsorption performance. The transmission electron microscopy (TEM) image of MoO3–g-C3N4 indicates a close contact between MoO3 and g-C3N4, which is beneficial to interparticle electron transfer. The high photocatalytic activity of MoO3–g-C3N4 is mainly attributed to the synergetic effect of MoO3 and g-C3N4 in electron–hole pair separation via the charge migration between the two semiconductors. The charge transfer follows direct Z-scheme mechanism, which is proven by the reactive species trapping experiment and the ˙OH-trapping photoluminescence spectra.
Starting Page	13610
Ending Page	13619
Page Count	10
File Format	PDF HTM / HTML
DOI	10.1039/C4RA00693C
Volume Number	4
Alternate Webpage(s)	http://www.rsc.org/suppdata/ra/c4/c4ra00693c/c4ra00693c1.pdf
Alternate Webpage(s)	https://doi.org/10.1039/C4RA00693C
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article