Visible light active heterostructured photocatalyst system based on CuO plate‐like particles and SnO₂ nanofibers

Abstract

In this study, CuO-SnO 2 p-n type heterostructures were produced and tested for the degradation of methylene blue and 4-nitrophenol under visible light irradiation. CuO particles were produced in plate-like morphology using hydrothermal synthesis. SnO 2 nanofibers were obtained by electrospinning. Structural, morphological, optical and semiconducting property characterization of heterostructured CuO-SnO 2 and individual phases were performed. The photocatalytic activity was found to change depending on the amount of CuO particles in heterostructured samples. Among others, the sample with 0.35 wt.% CuO-SnO 2 showed the highest photocatalytic efficiency with a degradation rate constant ~2 h −1 . Active specie scavenger tests revealed that the decomposition reaction occurs through direct oxidation mechanism by the holes in the valence band of SnO 2 in pure samples whereas in CuO-SnO 2 samples • O − 2 and • OH radicals also form and involve in the reactions. Further, the photocatalytic degradation mechanism was revealed using relative band potentials and p-n junctions of the heterostructured photocatalyst.

Synthesis and Characterization of Heterostructure Pd/Bi2WO6 Nanocomposites with Enhanced Properties of Visible-Light-Driven Photocatalyst

“…During photodegradation of RhB solutions containing 10% Pd/Bi 2 WO 6 nanocomposites under visible light irradiation, isopropanol (IPA), benzoquinone (BQ) and ethylenediaminetetraacetic acid disodium salt (EDTA-2Na) were also added for scavenging hydroxyl radical ( • OH), superoxide radical ( • O 2 − ) and photogenerated hole (h + ), respectively [32][33][34][35]. The photodegradation of RhB (Fig.…”

Mezo-gözenekli SnO2 Nanokompozitlerin Fotokatalitik Aktivitelerinin İncelenmesi

“…Böylece elektronların ve boşlukların ayrılma verimi artarak yarıiletkenlerin fotokatalitiksel aktivitesi artar [24]. Literatürde SnO2 ve farklı yarıiletkenlerle yapılmış kompozit yapıların fotokatalitiği üzerine çalışmalar [25][26][27][28][29]…”

Untitled

“…Several semiconductor materials such as TiO 2 , CuO, SnO 2 , and ZnO have been investigated as photocatalysts [2][3][4]. Among these, ZnO is an interesting one, primarily due to its stability and unique opto-electronic properties.…”