基礎講座 電気泳動(Electrophoresis)

A surface science perspective on TiO2 photocatalysis

Influence of parameters on the heterogeneous photocatalytic degradation of pesticides and phenolic contaminants in wastewater: A short review

https://core.ac.uk/download/pdf/10903854.pdf

Heterogeneous photocatalytic degradation of phenols in wastewater: A review on current status and developments

Photocatalytic oxidation of organic dyes and pollutants in wastewater using different modified titanium dioxides: A comparative review

Preparation of silver nanoparticles with controlled particle size

A series of TiO2 photocatalysts were obtained using several calcination temperatures ranging from 350 to 750 °C. The photocatalysts’ characteristics by X-ray diffraction, UV–vis and FTIR diffuse reflectance spectroscopies, X-ray photoelectron spectroscopy, BET and BJH methods showed that sample active in vis region had anatase structure, about 200 m2/g specific surface area, absorbed light for λ > 400 nm and contained 10.1 at.% of C–C species. The photocatalytic activity of the catalysts was estimated by measuring the decomposition rate of phenol in 0.21 mM aqueous solution in visible and ultraviolet light. The experimental data clearly indicate correlation between the absorption intensity of irradiation by obtained powders and their photocatalytic performance in phenol degradation. An increase in absorbance over the entire vis region and the highest photocatalytic activity for phenol degradation in visible light (λ > 400 nm) occurred for photocatalyst calcinated at 350 °C. Photocatalyst processed at 450 °C had the best activity in UV light (250

TiO2 photoactivity in vis and UV light: The influence of calcination temperature and surface properties

The aggregation and/or adhesion of bacterial cells is a serious disadvantage of electrophoretic separations. In this study, physicochemical surface characteristics of bacteria were measured to establish their role in bacterial adhesion and aggregation on the basis of electrophoretic behavior of different clinical strains of Gram-positive Staphylococcus aureus and Gram-negative Escherichia coli bacteria. The number and the shape of peaks obtained on the electropherograms were connected with the zeta potential measurements and in-line microscope observation using specially designed CE fluorescence stereomicroscope setup. These results suggest that the lower the zeta potential, the higher the number of smaller peaks detected. The direct microscopic observation of electrophoretic movement proved the presence of many small aggregates originating from individual or clustered bacterial cells. On the other hand, lower zeta potential was also observed for dead bacterial cells, which suggested that some of the peaks can be attributed to viable cells while the other to the dead ones.

Ewa Skwarek

Papers

Preparation of silver nanoparticles with controlled particle size

TiO2 photoactivity in vis and UV light: The influence of calcination temperature and surface properties

Effect of zeta potential value on bacterial behavior during electrophoretic separation.

Characterization of nanoparticles of biochars from different biomass

Toxicity of combined mixtures of nanoparticles to plants.