Nanoengineered Carbon-Based Materials For Reactive Adsorption of Toxic Industrial Compounds.

摘要

Composites of Cu-BTC and hydroxides of zinc, zirconium, copper and cobalt were synthesized. They were characterized from the view points of their porosity and surface and used as adsorbents of H2S, NH3, NO2, CO2. The results showed that the addition of carbonaceous phase increased the surface area and significantly affected the chemistry of the composites. The resulting hydroxide composites were very amorphous with developed surface area and the high content of terminal hydroxyl groups important for reactive adsorption of toxic gases. When the hydroxide of semiconductive properties was used, the samples exhibited photoactivity enhanced by the presence of graphene phase. That phase contributed to the separation of photoinduced charges and prevented their recombination leading to more efficient redox reaction. In the case of MOF /GO composites addition of GO increased in the degree of surface heterogeneity and thus formed more reactive centers for adsorption. When zirconium based MOF were modified (with an amine or Ce) the adsorption capacity for NO2 significantly increased. While in the case of H2S, water increased the amount adsorbed, a mixed effect was found for NO2 adsorption. On the materials obtained very high adsorption capacities for the removal of toxic gases and CO2 were measured.