In
this work, we report the synthesis of Pd-based ternary Pd@CdS@TiO
2
nanocomposites using molecular precursors. This method is
facile, less time-consuming, and cost-effective. This catalyst is
prepared within 2 h by a solvothermal route using molecular precursors.
Information about the phase, morphologies, elemental mapping, and
composition of the nanocomposites was obtained using various characterization
techniques. The catalytic activity of the as-prepared Pd-based ternary
Pd@CdS@TiO
2
nanocomposites exhibits effective reduction
efficiency for the conversion of toxic Cr(VI) to Cr(III) using formic
acid as a reducing agent within 5–7 min. To the best of our
knowledge, this is the first report on Pd-based ternary Pd@CdS@TiO
2
nanocomposites prepared by a solvothermal route and used
as catalysts toward the reduction of hexavalent chromium at room temperature.
In this study, we have reported a one-step synthesis of a TiO 2 @MoS 2 heterostructure. TiO 2 @MoS 2 was synthesized using a facile and cost-effective method. The as-synthesized TiO 2 @ MoS 2 heterostructure was characterized by suitable spectroscopic techniques. The obtained TiO 2 @MoS 2 was utilized as a supercapacitor electrode material. Electrochemical studies show that the TiO 2 @MoS 2 heterostructure possesses a specific capacitance of 337 F/g at a current density of 1 A/g in an aqueous solution. Furthermore, an application as a photocatalyst for the photoreduction of toxic hexavalent chromium was reported for the first time. This heterostructure showed the photoreduction of Cr 6+ to Cr 3+ in 120 min with formic acid as a scavenger under direct sunlight. A plausible mechanism of photoreduction of Cr 6+ to Cr 3+ under natural sunlight irradiation using TiO 2 @MoS 2 is proposed.
In
this study, bare CdS nanoparticles (NPs) were prepared by solvothermal
method using CdCl2(3-methylbenzaldehyde thiosemicarbazone)2 as a single-source molecular precursor in the presence of
ethylene glycol. Further, these CdS NPs were used for the preparation
of binary (CdS–TiO2) and ternary (CdS–TiO2/Pd) heterogeneous nanocatalysts. Characterization of the
as-prepared nanocatalysts has been carried out using different techniques
such as powder X-ray diffraction (XRD), Fourier transform infrared
spectroscopy, field emission scanning electron microscopy (FESEM),
transmission electron microscopy (TEM), UV–visible diffuse
reflectance spectroscopy, and photoluminescence studies. The peak
observed at 2θ = 39.5° in XRD confirms the successful doping
of noble metal (Pd) on the surface of CdS–TiO2 nanocatalyst,
which is well supported by Raman analysis. From FESEM and TEM analyses,
mixed morphology has been observed and elemental composition was confirmed
by energy-dispersive X-ray spectroscopy elemental mapping. Furthermore,
the as-prepared bare CdS NPs, binary CdS–TiO2, and
ternary CdS–TiO2/Pd heterogeneous nanocatalysts
were used for the reductive transformation of various nitroaromatic
compounds to their corresponding aromatic amines at room temperature.
It has been observed that among all of the catalysts, ternary CdS–TiO2/Pd heterogeneous nanocatalyst has excellent catalytic property
to reduce all nitroaromatic compounds in very short time span.
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