Mercury thioarsenate glasses (HgS)x(As2S3)1−x, 0.0 ≤x≤ 0.5, form a hybrid (HgS2/2)nchain/AsS3/2pyramidal network, highly unusual for metal chalcogenide glasses. This network is evidenced by Raman spectroscopy and DFT modelling and consistent with thermal properties. Nevertheless we cannot exclude completely the presence of a small fraction of HgS4/4tetrahedral units.

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Pollution of water from a wide range of organic pollutants is a serious environmental problem. Conventional water treatment technologies are not very effective for reducing the concentration of these pollutants to a desirable level. The aim of this work was to evaluate the efficiency of two technologies in reducing the pollutant concentration of two wastewater samples. Therefore, cross-linked cyclodextrin (CD) polymers were synthesized and their adsorption capacities were evaluated. An emerging oxidation process using doped TiO 2 was also evaluated. For both technologies, we observed a decrease in the total organic carbon (TOC) content due either to the adsorption of pollutants by CD polymers or to the mineralization of pollutants by photocatalysis.