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Nitrogen-Doped Graphene Quantum Dot-Passivated δ-Phase CsPbI 3 : A Water-Stable Photocatalytic Adjuvant to Degrade Rhodamine B.
- Source :
- Molecules; Nov2023, Vol. 28 Issue 21, p7310, 12p
- Publication Year :
- 2023
-
Abstract
- Inorganic halide perovskite CsPbI<subscript>3</subscript> is highly promising in the photocatalytic field for its strong absorption of UV and visible light. Among the crystal phases of CsPbI<subscript>3</subscript>, the δ-phase as the most aqueous stability; however, directly using it in water is still not applicable, thus limiting its dye photodegradation applications in aqueous solutions. Via adopting nitrogen-doped graphene quantum dots (NGQDs) as surfactants to prepare δ-phase CsPbI<subscript>3</subscript> nanocrystals, we obtained a water-stable material, NGQDs-CsPbI<subscript>3</subscript>. Such a material can be well dispersed in water for a month without obvious deterioration. High-resolution transmission electron microscopy and X-ray diffractometer characterizations showed that NGQDs-CsPbI<subscript>3</subscript> is also a δ-phase CsPbI<subscript>3</subscript> after NGQD coating. The ultraviolet-visible absorption spectra indicated that compared to δ-CsPbI<subscript>3</subscript>, NGQDs-CsPbI<subscript>3</subscript> has an obvious absorption enhancement of visible light, especially near the wavelength around 521 nm. The good dispersity and improved visible-light absorption of NGQDs-CsPbI<subscript>3</subscript> benefit their aqueous photocatalytic applications. NGQDs-CsPbI<subscript>3</subscript> alone can photodegrade 67% rhodamine B (RhB) in water, while after compositing with TiO<subscript>2</subscript>, NGQDs-CsPbI<subscript>3</subscript>/TiO<subscript>2</subscript> exhibits excellent visible-light photocatalytic ability, namely, it photodegraded 96% RhB in 4 h. The strong absorption of NGQDs-CsPbI<subscript>3</subscript> in the visible region and effective transfer of photogenerated carriers from NGQDs-CsPbI<subscript>3</subscript> to TiO<subscript>2</subscript> play the key roles in dye photodegradation. We highlight NGQDs-CsPbI<subscript>3</subscript> as a water-stable halide perovskite material and effective photocatalytic adjuvant. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 14203049
- Volume :
- 28
- Issue :
- 21
- Database :
- Complementary Index
- Journal :
- Molecules
- Publication Type :
- Academic Journal
- Accession number :
- 173565736
- Full Text :
- https://doi.org/10.3390/molecules28217310