New Carbamoyl Surface-Modified ZrO Nanohybrids for Selective Au Extraction from E-Waste.

Efficient and selective extractions of precious and critical metal ions such as Au(III) and Pd(II) were investigated using zirconia nanoparticles surface modified with different organic mono- and di-carbamoyl phosphonic acid ligands. The modification is made on the surface of commercial ZrO that is dispersed in aqueous suspension and was achieved by optimizing the Bronsted acid-base reaction in ethanol/HO solution (1:2), resulting in inorganic-organic systems of ZrO-L (L: organic carbamoyl phosphonic acid ligand). The presence, binding, amount, and stability of the organic ligand on the surface of zirconia nanoparticles were confirmed by different characterizations such as TGA, BET, ATR-FTIR, and P-NMR.

Influence of the Micro-Nanostructuring of Titanium Dioxide Films on the Photocatalytic Degradation of Formic Acid under UV Illumination.

Surface micro-nanostructuring can provide new functionalities and properties to coatings. For example, it can improve the absorption efficiency, hydrophobicity and/or tribology properties. In this context, we studied the influence of micro-nanostructuring on the photocatalytic efficiency of sol-gel TiO coatings during formic acid degradation under UV illumination.

Design of Hybrid PAH Nanoadsorbents by Surface Functionalization of ZrO Nanoparticles with Phosphonic Acids.

This study focuses on the preparation of innovative nanocomposite materials based on surface modification of commercial nano-ZrO optimized from Brønsted acid-base surface reactions. This surface modification was carried out by direct grafting of suitable phosphonic acids bearing a vinylic or phenylic substituent in aqueous solution. Different loading quantities of the anchoring organophosphorus compounds were applied for each materials synthesis.