Abstract
The aim of this paper is to prepare nano-functionalized ceramic foam filters from carbon-bonded alumina. The carbon-bonded filters were produced via the Schwartzwalder process using a two-step approach. The prepared ceramic foam filters were further coated using graphene oxide. Graphene oxide was prepared by the modified Tour method. The C/O of the graphene oxide ratio was evaluated by XPS, EDS and elemental analysis (EA). The amount and type of individual oxygen functionalities were characterized by XPS and Raman spectroscopy. The microstructure was studied by TEM, and XRD was used to evaluate the interlayer distance. In the next step, filters were coated by graphene oxide using dip-coating. After drying, the prepared composite filters were used for the purification of the water containing lead, zinc and cadmium ions. The efficiency of the sorption was very high, suggesting the potential use of these materials for the treatment of wastewater from heavy metals.
Highlights
Ceramic foam filters (Al2 O3 –C, Al2 O3, SiC–Al2 O3, Y-doped ZrO2 ) are commonly used by foundries, in order to capture non-metallic inclusions from the metal melts [1]
Graphene oxide (GO) was synthesized using the modified Tour method. This sample was of carbon-bonded alumina-based ceramic foam filters
GO was for the nanowater contaminated of bycarbon-bonded lead, zinc andalumina-based cadmium ions
Summary
Ceramic foam filters (Al2 O3 –C, Al2 O3 , SiC–Al2 O3 , Y-doped ZrO2 ) are commonly used by foundries, in order to capture non-metallic inclusions from the metal melts [1]. Without filtration, such impurities can produce internal cracks, slivers or blisters in final rolled products. The majority of the applied filters are open-cell ceramic foams produced via the replica process [3]. These filters can be further functionalized or modified due to their relatively high specific surface area. Because of their structure and chemistry, these filters can be modified by graphene oxides or graphene [4]
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