Thiol-modified CdS quantum dots: synthesis and photocatalytic properties

Photocatalysts based on CdS and CdS hybrid quantum dots modified with anionic stabilizers containing a hydroxyl group were synthesized. The optical and photocatalytic properties of CdS quantum dots were studied depending on the type of influencing factors such as stabilizer concentration, solution medium, time, and temperature used during the synthesis process. The effects of various factors on the properties of the photocatalysts, such as the type and concentration of the stabilizer, reagent concentrations, synthesis temperature, reaction time, pH value, and solvent type, were investigated. The effect of the stabilizer type on the band gap absorption peak and luminescence band was demonstrated. The average hydrodynamic size of CdS quantum dots stabilized with anionic stabilizers containing hydrophilic groups, chemical composition based on elemental analysis, functional groups using infrared spectroscopy, and rate constants of the photocatalytic reaction were calculated. The photocatalytic processes were carried out at 27 °C using sunlight. The reaction rate constants were determined, and the dehydration degrees of the photocatalyst were calculated. Quantum chemical calculations were performed. The obtained results were thoroughly characterized using spectrophotometric, spectrofluorimetric, X-ray diffraction (XRD), energy dispersive spectroscopy (EDS), dynamic light scattering (DLS), infrared spectroscopy (IR), and transmission electron microscopy (TEM) methods. The effects of quantum dot size, temperature, pH, recombination rate, as well as the coagulation and precipitation properties of nanoparticles on the reaction rate in photocatalytic processes were evaluated using spectrophotometric methods.

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