A photosensitive
metal–organic cage (MOC), denoted as MOC-Q2,
consisting of two Pd2+ metal ions and four tridentate ligands,
is synthesized, and then MOC-Q2 is linked with titania to obtain a
hybrid material TiO2-MOC-Q2, which exhibits remarkable
photocatalytic H2 evolution activities. After loading a
molecular Re catalyst, the ReP/TiO2-MOC-Q2 (6.5 wt %) photocatalyst
demonstrates a selective performance of CO2 reduction to
CO in dry CO2-saturated dimethylformamide (DMF) solution.
By adjusting only the water content in the reaction system, the ternary
catalyst can produce syngas with controlled ratios of CO/H2 varying from 15:1 to 1:2. CO/H2 gas evolution rates of
638/604 and 499/964 μmol g–1 h–1 are gained with a CO/H2 ratio of 1:1 and 1:2 in 5 h experiments,
respectively. And the corresponding TONCO/TONH2 in the 20 h persistence test is calculated to be 875/458. This system
presents one of the best activities among the reported syngas production
photocatalysts without using noble ruthenium complexes. This work
provides a promising way for the development of multifunctional heterogeneous
MOC-based photocatalysts.
The study was aimed to design fluoroquinolone (FQ) substitutes, improve the biological metabolism and concentration ability of fluoroquinolones (FQs) drug from the perspective of source control, and provide theoretical support...
Two metal-free calix[4]arene dyes
with pyridyl anchoring groups
(C4BTP and C4STP) and a comparative single-chain dye (M-BTP) for comparison
have been synthesized and applied in dye-sensitized photoelectrochemical
cells in corporation with a pyridyl anchor-based molecular water oxidation
catalyst (RuPy). All the devices based on the three dyes can conduct
overall water splitting reaction under visible light with low or zero
bias. It is confirmed that the cone structure and multiple light-harvesting
units of calixarene dyes bring superior durability and photoelectroconversion
property compared with chain dyes M-BTP, and the introduction of alkalinous
pyridyl anchoring groups improves the adsorption firmness on TiO2 in aqueous solution through the Ti–N bond. The optimized
TiO2|C4BTP+RuPy photoanode gives the highest photocurrent
density of over 800 μA cm–2, while the TiO2|C4STP+RuPy photoanode exhibits the best Faradaic efficiency
of 64.9% for O2 evolution. To meet the needs of practical
applications, the TiO2|C4BTP+RuPy photoanode is utilized
in a two-electrode system with 0 V bias, giving a steady photocurrent
density of 42 μA cm–2 in 3600 s and a Faradaic
efficiency of 45.9% for O2 evolution. This study offers
an inspiration for developing efficient and durable organic photosensitizers
in photocatalytic water-splitting devices.
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