Synthesis and characterization of Ag 2 O/B 2 O 3 /TiO 2 ternary nanocomposites for photocatalytic mineralization of local dyeing wastewater under artificial and natural sunlight irradiation

In this work, Ag O/B O /TiO ternary nanocomposite was synthesized by a combination of green and precipitation method involving mixing of different concentrations of silver nitrate, boric acid, and titanium (IV) isopropoxide precursor with Plumeria acuminate leaf extract. The extract was obtained by...

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Veröffentlicht in:Environmental science and pollution research international 2019-07, Vol.26 (19), p.19942
Hauptverfasser: Tijani, Jimoh Oladejo, Momoh, Ufon Ojogbane, Salau, Rasaq Bolakale, Bankole, Mercy Temitope, Abdulkareem, Ambali Saka, Roos, Wiets Dániel
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container_issue 19
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container_title Environmental science and pollution research international
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creator Tijani, Jimoh Oladejo
Momoh, Ufon Ojogbane
Salau, Rasaq Bolakale
Bankole, Mercy Temitope
Abdulkareem, Ambali Saka
Roos, Wiets Dániel
description In this work, Ag O/B O /TiO ternary nanocomposite was synthesized by a combination of green and precipitation method involving mixing of different concentrations of silver nitrate, boric acid, and titanium (IV) isopropoxide precursor with Plumeria acuminate leaf extract. The extract was obtained by boiling the mixture of distilled water and the powdered leaves in a beaker for few minutes followed by filtration. The microstructure, morphology, chemical composition, surface area, phase structure, and optical properties of the various prepared nanomaterials were determined by HRTEM, HRSEM, UV-Vis/DRS, BET, XRD, and XPS. The photocatalytic potential of TiO nanoparticles and Ag O/B O /TiO nanocomposites to degrade local dyeing wastewater under artificial and natural sunlight irradiation was investigated. The extent of degradation of the organic pollutants was measured using chemical oxygen demand (COD) and total organic carbon (TOC) as indicator parameters. The XRD pattern of Ag O/B O /TiO nanocomposites revealed that the formation of pure anatase TiO phase and the addition of both silver and boron precursors did not influenced the phase structure of the nanocomposites. The oxidation states of +1 and +3 for both Ag and B on the surface of Ag O/B O /TiO nanocomposites were confirmed by XPS. Optical characterization of the sample revealed reduction of band gap energy from 2.6 to 2.0 eV for TiO and Ag O/B O /TiO , respectively. The Ag O/B O TiO nanocomposites demonstrated excellent photocatalytic activity under natural sunlight and artificial light than mono and binary oxide systems with TOC and COD degradation efficiencies of 86.11% and 75.69%, respectively. The kinetics of degradation of organic dyes in the wastewater followed the order of Langmuir-Hinshelwood pseudo-first-order > Freundlich > Zero > Parabolic diffusion model. The coupling effect of Ag O and B O onto TiO framework was responsible for the enhanced photochemical stability of the nanocomposites even after five repeated cycles.
doi_str_mv 10.1007/s11356-019-05124-y
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The oxidation states of +1 and +3 for both Ag and B on the surface of Ag O/B O /TiO nanocomposites were confirmed by XPS. Optical characterization of the sample revealed reduction of band gap energy from 2.6 to 2.0 eV for TiO and Ag O/B O /TiO , respectively. The Ag O/B O TiO nanocomposites demonstrated excellent photocatalytic activity under natural sunlight and artificial light than mono and binary oxide systems with TOC and COD degradation efficiencies of 86.11% and 75.69%, respectively. The kinetics of degradation of organic dyes in the wastewater followed the order of Langmuir-Hinshelwood pseudo-first-order &gt; Freundlich &gt; Zero &gt; Parabolic diffusion model. 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title Synthesis and characterization of Ag 2 O/B 2 O 3 /TiO 2 ternary nanocomposites for photocatalytic mineralization of local dyeing wastewater under artificial and natural sunlight irradiation
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