Boosting Visible‐Light Photocatalytic Redox Reaction by Charge Separation in SnO₂/ZnSe(N₂H₄)_0.5 Heterojunction Nanocatalysts

Abstract

In this work, environmentally friendly photocatalysts with attractive catalytic properties are reported that have been prepared by introducing SnO2 quantum dots (QDs) directly onto ZnSe(N2H4)0.5 substrates to induce advantageous charge separation. The SnO2/ZnSe(N2H4)0.5 nanocomposites could be easily synthesized through a one‐pot hydrothermal process. Owing to the absence of capping ligands, the attached SnO2 QDs displayed superior photocatalytic properties, generating many exposed reactive surfaces. Moreover, the addition of a specified amount of SnO2 boosted the visible‐light photocatalytic activity; however, the presence of excess SnO2 QDs in the substrate resulted in aggregation and deteriorated the performance. The spectroscopic data revealed that the SnO2 QDs act as a photocatalytic mediator and enhance the charge separation within the type II band alignment system of the SnO2/ZnSe(N2H4)0.5 heterojunction photocatalysts. The separated charges in the heterojunction nanocomposites promote radical generation and react with pollutants, resulting in enhanced photocatalytic performance.

Synthesis of Fe2O3@SnO2 Core‐shell Nanocomposites via Thermal Decomposition Route and their Application as an Adsorbent

“…The first and second step weight loss steps observed between 30 °C and 200 °C and 220 °C and 450 °C are due to the loss of physisorbed H 2 O molecules and decomposition of cyanuric acid and amine groups, respectively. [40,[46][47][48] The core-shell nanocomposite FS-1-asp with more organic moieties and SnO 2 content exhibits higher weight loss compared to the other nanocomposites. The major weight loss in the Fe 2 O 3 @SnO 2 nanocomposites is due to the SnO 2 component.…”

“…[46] The second step (11.9 %) between 95 °C and 455 °C is attributed to the loss of amine groups and crystallization of SnO 2 . [46,47] Fe 2 O 3 -asp shows a total weight loss of 23.4 % in two steps. The first weight loss (6.6 %) between 30 °C and 200 °C is due to loss of physisorbed water molecules.…”

“…SnO 2 -asp shows two-step weight loss pattern with a total weight loss of 18.1 %; the first weight loss (6.2 %) observed between 30 °C and 95 °C is due to loss of physisorbed water molecules. [46] The second step (11.9 %) between 95 °C and 455 °C is attributed to the loss of amine groups and crystallization of SnO 2 . [46,47] Fe 2 O 3 -asp shows a total weight loss of 23.4 % in two steps.…”

g‐C3N4 Coating Enhanced Cu@AC for Catalytic Wet Air Oxidation of Phenol under Mild Conditions

“…Advanced oxidation processes (AOPs) refer to the oxidative decomposition of the organic substance into nontoxic compounds using strong oxidants such as hydrogen peroxide, ozone and persulfates. [5] All these oxidants are expensive for high concentration organic wastewater treatment. Photo-catalytic oxidation and electrocatalytic oxidation are also categorized into AOPs.…”