In the present study, a mesoporous
photocatalyst based on Au–Pd
nanoparticles incorporated into g-C3N4 was prepared
by a coassembly method using melamine as the carbon and nitrogen source,
polyvinyl pyrrolidone as the dispersing agent, and pulse laser ablation
in liquid technique for preparing gold nanoparticles and subsequent
decoration with Pd nanoparticles. At the final stage, Au–Pd/g-C3N4 nano-photocatalyst was obtained via low-ramping
pyrolysis in an argon atmosphere. The activity of the catalyst was
related to its structure, which was characterized by high-resolution
transmission electron microscopy, field-emission scanning electron
microscopy, X-ray photoelectron spectroscopy, energy-dispersive X-ray
spectroscopy, and Brunauer–Emmett–Teller analysis. The
results demonstrated that the Au–Pd-containing catalyst exhibited
superior performance compared to its counterparts containing monometallic
nanoparticles. The influence of variables such as reaction temperature,
time of irradiation, amount of hydrogen peroxide, and amount of metal
nanoparticles was investigated. Under optimized conditions, the Au–Pd/g-C3N4 photocatalyst showed benzene conversion of 26%
at a phenol selectivity of 100%, giving no dihydroxylated byproducts.
The catalyst was highly stable and recyclable, thus showing promise
for the direct conversion of benzene to phenol. Time-dependent density
functional theory (TD-DFT) calculations describe the activation of
the oxidant by charge transferring from the metal clusters to the
graphitized carbon nitride support and explain why the Au–Pd/g-C3N4 composite (rather than Au/g-C3N4) has superior efficiency in promoting the benzene-to-phenol
conversion. The same DFT calculations showed that the Pd/g-C3N4 composite cannot catalyze the same processes.
Novel covalent triazine framework-decorated phenyl-functionalised SBA-15 was synthesised via a facile AlCl3-catalysed Friedel–Crafts strategy and applied as an adsorbent for dye removal.
In this paper, we report an environmentally-friendly and low cost synthetic approach for large-scale fabrication of 2-dimentional porous Ni/Co-NO-based layered double hydroxide (Ni/Co-NO-LDH) nanosheet through ultrasonic-assisted process. The synthesis procedure used ethylene glycol/water system as an eco-friendly solvent system. The synthesized LDH was characterized by FE-SEM, TEM, XRD, and FT-IR techniques. FE-SEM and TEM images showed porous structure surface morphology of the synthesized LDH. Also, For Ni/Co-NO-LDH, a hexagonal ultrathin layered was obtained owing to ultrasonic irradiation and applied processing conditions. The prepared LDH was used as sorbent in dispersive micro solid-phase extraction procedure. Two phenolic acids including p-hydroxybenzoic acid and p-coumaric acid were selected as model compounds. Some experimental factors affecting the extraction efficiency of the analytes were investigated and optimized. Finally, the sorbent was used for the extraction of model compound from fruit juice samples followed by high performance liquid chromatography. Linear dynamic range of 0.5-500µgL with a low detection limit (0.1µgL) was obtained by the method. The relative standard deviations were 2.5 and 4.3% for p-hydroxybenzoic acid and p-coumaric acid, respectively. All recoveries were between 82 and 92%.
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