Ag<sub>2</sub>S Quantum Dots Based on Flower-like SnS<sub>2</sub> as Matrix and Enhanced Photocatalytic Degradation
oleh: Wenhua Zhao, Zhiqiang Wei, Long Ma, Jiahao Liang, Xudong Zhang
| Format: | Article |
|---|---|
| Diterbitkan: | MDPI AG 2019-02-01 |
Deskripsi
Ag<sub>2</sub>S quantum dots were dispersed on the surface of SnS<sub>2</sub> nanoflowers forming a heterojunction via in-situ ion exchange to improve photocatalytic degradation of RhB. All samples exhibit the hexagonal wurtzite structure. The size of Ag<sub>2</sub>S@SnS<sub>2</sub> composites are ~ 1.5 μm flower-like with good crystallinity. Meanwhile, the E<sub>g</sub> of 3% Ag<sub>2</sub>S@SnS<sub>2</sub> is close to that of pure SnS<sub>2</sub>. Consequently, the 3% Ag<sub>2</sub>S@SnS<sub>2</sub> composite displays the excellent photocatalytic performance under simulated sunlight irradiation with good cycling stability, compared to the pure SnS<sub>2</sub> and other composites. Due to the blue and yellow luminescence quenching, the photogenerated electrons and holes is effectively separated in the 3% Ag<sub>2</sub>S@SnS<sub>2</sub> sample. Especially, the hydroxyl radicals and photogenerated holes are main active species.