| Popis: |
Magnetic graphene oxide-SiO2-TiO2 (MGST) composite was prepared for the absorption and further photodegradation of PAHs to reduce the risk of PAHs in the water environment. Magnetic graphene oxide (MGO) was obtained by introducing Fe3O4 to graphite oxide (GO). Furthermore, the suitable SiO2 layer was wrapped on the MGO for further modification with TiO2. Finally, the functional MGST composite with uniform morphology was obtained. The prepared MGST was confirmed by XRD, FTIR and XPS, its morphology was observed by SEM and TEM. Naphthalene, phenanthrene and pyrene were selected as models. It was found that the adsorption capacity of MGST showed the order of naphthalene (NAP) < phenanthrene (PHE) < pyrene (PYR). Moreover, the regeneration of MGST was conducted by photolysis, the photodegradation of naphthalene was studied and mechanism was proposed. The successive adsorption-desorption studies indicated that MGST kept its adsorption and photodegradation capability almost constant during 5 cycles, which demonstrated its high stability and good sustainability. Importantly, MGST was able to remove more than 80% of aromatic compounds from coking wastewater and tap water, indicating its promising potential for practical application. |
