Enhanced simulated sunlight‐driven photocatalytic performance of SnWO₄ prepared in the presence of cetyltrimethylammonium bromide

Abstract

In this paper, SnWO4 photocatalyst with enhanced simulated sunlight‐driven photocatalytic performance was prepared by a hydrothermal method in the presence of cetyltrimethylammonium bromide (CTAB). The samples were characterized by Brunauer–Emmett–Teller method, X‐ray diffraction, UV–vis diffuse reflectance spectroscopy, X‐ray photoelectron spectroscopy, surface photovoltage spectroscopy, and scanning electron microscopy. The active free radicals formed were investigated by electron spin resonance spectroscopy and trapping experiments. Photocatalytic abilities of the photocatalyts were evaluated using methyl orange as model contaminant. The results show that CTAB induces redshift and promotes the photo‐induced charge separation rate of SnWO4, thereby boosting the photocatalytic performance. The photocatalytic test results reveal that the photocatalytic activity of CTAB‐SnWO4 is 7.25 times of the reference SnWO4.

Constructing a Two-Dimensional SnWO4 Nanosheet Array Film for Enhanced Photoelectrochemical Performance

“…The SnWO 4 -NS photoanode after the I-t test showed the existence of Sn 2+ . Two peaks at ∼487.4 and ∼495.8 eV can also be founded, corresponding to 3d 5/2 and 3d 3/2 of Sn 4+ , respectively, proving the formation of Sn 4+ (the ratio of Sn 4+ /Sn 2+ is about 1:1) . The W 4f spectral peak positions of the three samples were not significantly different, and all showed two peaks at binding energies of ∼37.6 and ∼35.5 eV, corresponding to W 6+ (Figure c) .…”

“…Two peaks at ∼487.4 and ∼495.8 eV can also be founded, corresponding to 3d 5/2 and 3d 3/2 of Sn 4+ , respectively, proving the formation of Sn 4+ (the ratio of Sn 4+ /Sn 2+ is about 1:1). 35 The W 4f spectral peak positions of the three samples were not significantly different, and all showed two peaks at binding energies of ∼37.6 and ∼35.5 eV, corresponding to W 6+ (Figure 3c). 9 Furthermore, the O 1s spectrum (Figure 3d) contains two peaks, the peak located at ∼530.9 eV corresponds to lattice oxygen (O L ), while the peak located at ∼532.4 eV belongs to surface-adsorbed oxygen (O S ).…”