期刊
APPLIED CATALYSIS B-ENVIRONMENTAL
卷 291, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.apcatb.2021.120056
关键词
Lanthanide-organic frameworks; Metal-organic frameworks; Titanium dioxide; Visible light photoactivity; Up-conversion
资金
- Polish National Science Center [2017/27/N/ST5/00738]
The study presents a highly efficient and stable composite with core-shell-like architecture that can convert incompatible visible radiation into functional ultraviolet photons for sunlight-driven photocatalysis. Integration of lanthanide-carboxylate coordination networks with titanium dioxide enhances light harvesting and mass transfer efficiency, resulting in additional photoexcited electrons. The Nd(ndc) metal-organic framework successfully activates TiO2, achieving a high efficiency of phenol degradation under visible light exposure.
Highly efficient and quite stable composite with core-shell-like architecture reported herein, responds to the challenge of sunlight-driven photocatalysts. The Ln(ndc)/TiO2 photocatalytic system comprises active lanthanide-carboxylate coordination networks (Nd, Er, Ho, and Tm as metal ions, and 2,6-naphthalene dicarboxylic acid as the organic linker) and inert titanium dioxide and allow to convert incompatible visible radiation into functional ultraviolet photons. The combination of the antenna-reactor photocatalyst complex with Ln(ndc) shell layers promotes light harvesting and efficient mass transfer, resulting in additional photoexcited electrons. The Nd(ndc) metal-organic framework successfully activate TiO2 via up-conversion energy transfer. The apparent quantum efficiency, determined at wavelengths corresponding to the transitions from the Nd3+ ground state, equals to 2.8% and 3.2% for 525 and 583 nm, respectively. Integration of the Nd(ndc) MOF and TiO2 results in the highest efficiency of phenol degradation, affording a value of 87.5% after 60 min of visible light (lambda > 420 nm) exposure.
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