Understanding of the mechanism of crystal violet adsorption on modified halloysite: Hydrophobicity, performance, and interaction.

Halloysite was processed at 600 °C and then by acid leaching with HCl solutions of different concentrations, i.e. 0.

Development and characterization of a new dolomite-based catalyst: application to the photocatalytic degradation of pentachlorophenol.

The development of new catalysts from abundant raw materials, generating attractive photocatalytic activity, constitutes a real challenge in the context of sustainable development concerns. In this setting, a dolomite was treated at 800 °C (D800) and then chemically modified by Ca(NO) (CaD800) using a simple procedure. The resulting materials were characterized by X-ray diffraction, scanning electron microscopy, energy dispersive X-ray spectroscopy (EDS), solid state UV spectroscopy, and used as catalysts of pentachlorophenol (PCP) degradation in aqueous solutions under UV light irradiation.

Removal of catechol from water by modified dolomite: performance, spectroscopy, and mechanism.

Dolomite was treated at 800 °C (D800), characterized, and used in the adsorptive removal of catechol (1,2-dihydroxybenzene) from aqueous solutions. The performances of the D800 sample, named dolomitic solid, were compared with those of the raw material. A bibliographic review shows that the data on the adsorption of phenolic compounds by dolomites are non-existent.

Cu(II) adsorption by halloysites intercalated with sodium acetate.

Intercalated halloysites with sodium acetate at various contact time were prepared. The resulting materials were characterised by X-ray powder diffraction, Fourier transformed infrared spectroscopy, scanning electronic microscopy, and specific surface area evaluation. The modified halloysites were employed as Cu(II) adsorbents from aqueous solutions.

TiO2-assisted degradation of a perfluorinated surfactant in aqueous solutions treated by gliding arc discharge.

The plasma-chemical degradation of Forafac 1110, a perfluorinated non-ionic surfactant, in aqueous solutions was investigated using TiO2 catalysts. The considered plasma was the gliding arc in humid air, which results from an electric discharge at atmospheric pressure and quasi-ambient temperature. Two titanium dioxide powders were used and their synergistic effects on the Forafac degradation were compared.

Removal of pentachlorophenol from aqueous solutions by dolomitic sorbents.

The partial decomposition of dolomite carried out within the temperature range 600-1000 degrees C provides new sorbents, called dolomitic sorbents. Their surface properties and identification by X-ray diffraction are discussed. The lowest specific surface area value was found for the raw dolomite, while the highest value was achieved by the D-1000 sample.