Abstract
ABSTRACTAn environment-friendly graphene reinforced slag-based nanocomposite (GRSN) was synthesized by incorporation of two-dimensional lamellar graphene into the alkali-activated blast-furnace slag-based cementitious-material (ABSC), and firstly used as an excellent catalyst for solar photocatalytic hydrogen generation. The mechanical testing results indicated that the compressive and flexural strengths of ABSC were prominently reinforced by the incorporation of graphene. The X-ray diffraction (XRD) results showed that the GRSN powder mainly contained the network structure of calcium silicate hydrate (CSH) and calcium aluminate hydrate (CAH). The photoluminescence spectra implied that the separation efficiency of photo-excited electrons and holes increased with the increasing graphene. The yield of hydrogen gradually ascended with the amount of graphene incorperated. The highest H2 yield of 1928.6 μmol/g for 0.02GRSN sample is ascribed to the synergistic effect of graphene and semiconductor oxides of TiO2 and Fe2O3 deriving from the ABSC.
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