Photophysical and photocatalytic properties of structurally modified UiO-66

Mostafa Zeama, Mohamed Morsy, Safwat Abdel-Azeim, Mahmoud Abdelnaby, Ahmed Alloush, Zain Yamani

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

Abstract

UiO-66 metal-organic-frameworks (MOFs) are well known for their stability and photoactivity, especially for CO2 reduction. This work reports different incorporation methods of titanium metal into UiO-66-NH2 based frameworks via post-synthetic as well as in situ metal exchange. Each method successfully produced crystalline material with enhancement in photophysical and photocatalytic properties. The origin of the enhanced photophysical was investigated with electron paramagnetic resonance and ultraviolet-visible diffuse reflectance spectroscopy measurements. The observed decrease in the electronic band gaps of the modified UiO-66-based MOFs is supported by density functional theory (DFT)-electronic structure calculations. The DFT-simulations also confirmed the synergistic effect between –NH2 functionalization and titanium metal incorporation that boosts the reactivity of the respective resulting MOFs. A detailed investigation of CO2 reduction was then carried out with the different MOFs models. A remarkable enhancement of the photocatalytic activity was observed by using the UiO-66-NH2 based frameworks compared to the pristine UiO-66. A nearly doubled photocatalytic activity was obtained by the Ti-Zr mixed MOF materials regardless of the method or the ratio of incorporated titanium metal loading.
Original languageEnglish (US)
Pages (from-to)119287
JournalInorganica Chimica Acta
Volume501
DOIs
StatePublished - Dec 9 2019
Externally publishedYes

ASJC Scopus subject areas

  • Materials Chemistry
  • Physical and Theoretical Chemistry
  • Inorganic Chemistry

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