Abstract
New materials are obtained by transforming fly ash wastes into a valuable composite, with tandem adsorption and photodegradation properties. Mild hydrothermal synthesis, from titanium dioxide, platinum nanoparticles and zeolite materials obtained from a waste, fly ash, as support, was involved in the composite preparation. The platinum nanoparticles extended the photocatalytic activity of the composite in visible range (Eg = 2.1 eV). The efficiency of tandem adsorption and photocatalytic activity of the new composite were determined to be 25% for Bemacid Blau and 43.89% for Bemacid Rot after 360 min, the irradiation time. The addition of H2O2 improves the process efficiency up to 80.70% and 93.43%, respectively. The Pt nanoparticle (PtNP) contribution led to the band gap energy change to Vis light (400 nm), thus suggesting the possibility of photocatalysis under the action of a fraction of natural light.
Highlights
Intense and diverse industrial activity raises major issues of environmental protection
This paper aims to demonstrate, through a detailed investigation, a technically feasible way to combine non-energy raw materials from different sources (Romanian fly ash resulting from the burning of harder, older anthracite and bituminous coal, in this case) and quality (F type—the sum of SiO2, Al2 O3 and Fe2 O3 is over 70%) with TiO2 semiconductor and Pt nanoparticles (PtNPs)
On the FADPt diffractogram, the shape of the peaks appears as overlapping, meaning that this substrate contains semiconductor oxides homogenously dispersed within the composite, which indicates the existence of a high amount of contact aluminosilicate with TiO2
Summary
Intense and diverse industrial activity raises major issues of environmental protection It is, on the one hand, the discharge of pollutants into the environment, either accidentally or due to the inefficiency of removal methods. Depending upon the source and composition of the coal being burned, the components of fly ash vary considerably, but all fly ash includes substantial amounts of silicon dioxide (SiO2 ) (both amorphous and crystalline), aluminum oxide (Al2 O3 ), iron oxide (Fe2 O3 ) and calcium oxide (CaO) [4] These physical, chemical and mineralogical properties suggest the opportunities for use and disposal. A contextual approach, namely, the use of fly ash waste to develop effective solutions in the removal of industrial dyes, can help to reduce their negative effect on the environment.
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