Titanium–Porphyrin
Metal–Organic Frameworks
as Visible-Light-Driven Catalysts for Highly Efficient Sonophotocatalytic
Reduction of Cr(VI)
Posted on 2022-09-30 - 22:03
In this work, we synthesized and characterized four titanium–porphyrin
metal–organic frameworks (MOFs) [DGIST-1(M), M = Co(II), Fe(III),
Zn(II), and H2] and used them as visible-light-driven catalysts
for sonophotocatalytic Cr(VI) reduction. DGIST-1(M) exhibited open-framework,
broad light absorption stemmed from ligand and sensitive photocurrent
responses owing to the integration of one-dimensional Ti-oxo chains
and 4-connected conjugated TCPP ligand (TCPP = tetrakis(4-carboxyphenyl)-porphyrin).
DGIST-1(M) presented efficient reduction of Cr(VI) to Cr(III) in aqueous
solution when used as sonophotocatalytic catalysts. The average reduction
rates upon Cr(VI) were 0.920, 0.476, 0.377, and 0.194 mg·L–1·min–1 for DGIST-1(H2), DGIST-1(Zn), DGIST-1(Co), and DGIST-1(Fe), which are 1.15–2.45
times higher than those in photocatalysis. Sonophotocatalytic experiments
and electron paramagnetic resonance measurement proved that Ti-oxo
chain units and porphyrin ligand in the structures of DGIST-1(M) existed
as catalytic active centers for sonophotocatalytic reduction of Cr(VI).
Photoluminescence and UV absorption spectra revealed that the unity
of photocatalysis and sonochemistry strengthened the migration of
photogenerated electrons from DGIST-1(M) to Cr(VI), which improved
the activities of catalysts. This study suggested that the association
of titanium–porphyrin MOFs and sonophotocatalytic technology
is an impactful program for enhancing MOF-based photocatalytic systems.
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Chen, Dashu; Jin, Zhi; Xing, Hongzhu (2022). Titanium–Porphyrin
Metal–Organic Frameworks
as Visible-Light-Driven Catalysts for Highly Efficient Sonophotocatalytic
Reduction of Cr(VI). ACS Publications. Collection. https://doi.org/10.1021/acs.langmuir.2c01932
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AUTHORS (3)
DC
Dashu Chen
ZJ
Zhi Jin
HX
Hongzhu Xing
KEYWORDS
catalytic active centersbased photocatalytic systems45 times higher15 – 2oxo chain unitspresented efficient reductionzn ), dgistiii ), znii ), feii ),fe ),oxo chainsstudy suggestedsonophotocatalytic technologysonophotocatalytic reductionsonophotocatalytic experimentssonochemistry strengthenedphotogenerated electronsimpactful programexhibited openenhancing mofaqueous solution