A simple hydrothermal method was applied to synthesize a 2D/2D g-C 3 N 4 /Bi 2 WO 6 (CN/BWO) composite photocatalyst for the photocatalytic removal of gaseous methyl mercaptan (CH 3 SH). The layered structure of CN/BWO and the C-O-Bi bonds at the interlayer interface were confirmed by thorough characterization techniques. The C-O-Bi bonds were demonstrated to reduce interlayer charge transfer resistance and inhibit photogenerated electron/hole pairs recombination. Therefore, 0.1-CN/BWO exhibited the highest photocatalytic efficiency for CH 3 SH removal, which was 1.4 times higher than 0.1-CN/BWONF with nanoflower structure, and 5.1 and 1.9 times higher than that of pure g-C 3 N 4 and Bi 2 WO 6 . The photocatalytic oxidation pathway and mechanism for CH 3 SH removal were revealed based on reactive species trapping, electron spin resonance (ESR), and in situ diffuse reflectance infrared Fourier transform spectroscopy (in situ DRIFTS) tests. This work provides new insights into the design of photocatalysts with high photocatalytic performance and stability for the removal of volatile organic compounds (VOCs).
Yutong Zhao,Dingkai Chen,Jiangping Liu,Dedong He,Xiaohua Cao,Caiyun Han,Jichang Lu,Yongming Luo
Chromium (Cr) species with different loading (1, 2.5, 5, 7.5 and 10 wt%) were impregnated over alumina (Al 2 O 3 ) and silica (SiO 2 ) supports to investigate the effects of the metal-support interactions on decomposing methyl mercaptan. The characterization results revealed that the amount and nature of surface hydroxyl groups of support (Al-OH and Si-OH) induce the different interactions between chromium species and support, which generates an exceeding support-dependent dispersion, oxidation states, reducibility, and acid-base properties for the prepared Cr-based catalysts. As compared with SiO 2 support, Al 2 O 3 -supported chromium catalysts with evenly dispersed monochromatic Cr(VI) species exhibited excellent catalytic activity by means of theirs enhanced reducibility and sufficient acid-basic sites. Therefore, it is concluded that the metal-support interactions can be tailored by engineering the amount and nature of hydroxyl groups on the support.
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