The gelation of a low value-added industrial waste, phenolic oil (PO), was successfully carried out for the first time in presence an acid catalyst and paraformaldehyde (PF), which is by-product formaldehyde industry. Therefore, use PO PF can be considered win-win situation as attempt to valorise these ‘wastes’ integrate them into circular economy. A broad range formulations has been explored, ...

Sol–gel process was used for the preparation of Rhodamine 6G (R6G) doped silica xerogels, using tetraethylorthosilicate [TEOS, Si(OC2H5)4] as the precursor for the silica network. Silica alcosol was prepared by hydrolysis and polycondensation of ethanol (EtOH) diluted TEOS in the presence of citric acid (CTA) catalyst. The ethanolic R6G was added to the alcosol to trap R6G molecules inside the ...

Three Eu(II1) luminescent compounds were separately entrapped in a xerogel porous silica matrix and finely ground particles of it were deposited on a glass support with polyvinylacetate (PVAc) as a binder to build a thin film sensor. These 3 devices were immersed in aqueous solutions of Cu(I1) and the content of this metal was evaluated by emissionquenching experiments. The sensor containing th...