MoO4
2–/WO4
2– intercalated layered double hydroxide (LDH) was prepared
by taking
nitrate intercalated Zn/Y LDH (Zn/Y/N) by the ion exchange method.
The structure, morphology, texture, optical absorption properties,
and photocatalytic activities of all the as-prepared catalysts were
studied in detail. Optical difference spectra (ODS) along with electron
paramagnetic resonance (EPR) measurement revealed that the absorption
in the visible region is attributed to the metal-to-metal charge-transfer
(MMCT) excitation of oxo-bridged bimetallic linkage of Zn–O–Y
in Zn/Y LDHs and can initiate the degradation of Rhodamine 6G (RhG)
upon visible-light irradiation. The enhanced reactivity of tungstate
and molybdate intercalated Zn/Y LDHs indicated that the interlayer
space is the reaction field. The dye degradation process follows Langmuir–Hinshelwood
first order kinetics. The possible photodegradation mechanism was
studied by the examination of active species such as OH•, hVB
+, and O2
–• anions by using appropriate scavengers. The substantial decrease
of chemical oxygen demand (COD) during photocatalytic degradation
has been established.
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