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Environmental Science and Pollution Research

, Volume 26, Issue 19, pp 19942–19967 | Cite as

Synthesis and characterization of Ag2O/B2O3/TiO2 ternary nanocomposites for photocatalytic mineralization of local dyeing wastewater under artificial and natural sunlight irradiation

  • Jimoh Oladejo TijaniEmail author
  • Ufon Ojogbane Momoh
  • Rasaq Bolakale Salau
  • Mercy Temitope Bankole
  • Ambali Saka Abdulkareem
  • Wiets Dániel Roos
Research Article
  • 113 Downloads

Abstract

In this work, Ag2O/B2O3/TiO2 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 TiO2 nanoparticles and Ag2O/B2O3/TiO2 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 Ag2O/B2O3/TiO2 nanocomposites revealed that the formation of pure anatase TiO2 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 Ag2O/B2O3/TiO2 nanocomposites were confirmed by XPS. Optical characterization of the sample revealed reduction of band gap energy from 2.6 to 2.0 eV for TiO2 and Ag2O/B2O3/TiO2, respectively. The Ag2O/B2O3/TiO2 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 Ag2O and B2O3 onto TiO2 framework was responsible for the enhanced photochemical stability of the nanocomposites even after five repeated cycles.

Keywords

Green synthesis Co-doping Boron trioxide Silver oxide TiO2 nanoparticles Photocatalytic activity Local dyeing wastewater Light sources 

Notes

Acknowledgements

The authors appreciate the contribution of the following people for their technical assistance: Dr. Remy Bucher (XRD, ithemba Labs, South Africa); Prof. Emmanuel Iwuoha (Photoluminescence Spectrophometry analysis, Sensor Labs, University of the Western Cape, South Africa), Dr. Franscious Cummings (HRTEM/HRSEM, Physics department, University of the Western Cape (UWC), South Africa); and Prof. W.D. Roos (XPS analysis, Physics Department of the University of Free State, South Africa.

Funding information

The authors acknowledged Tertiary Education Trust Fund, Nigeria, with grant number (TETFUND/FUTMINNA/2017/10) for the sponsorship.

Supplementary material

11356_2019_5124_MOESM1_ESM.doc (70 kb)
ESM 1 (DOC 69 kb)

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  • Jimoh Oladejo Tijani
    • 1
    • 2
    Email author
  • Ufon Ojogbane Momoh
    • 1
    • 2
  • Rasaq Bolakale Salau
    • 1
  • Mercy Temitope Bankole
    • 1
    • 2
  • Ambali Saka Abdulkareem
    • 2
    • 3
  • Wiets Dániel Roos
    • 4
  1. 1.Department of ChemistryFederal University of TechnologyMinnaNigeria
  2. 2.Nanotechnology Research Group, Centre for Genetic Engineering and Biotechnology (CGEB)Federal University of TechnologyMinnaNigeria
  3. 3.Department of Chemical EngineeringFederal University of TechnologyMinnaNigeria
  4. 4.Department of PhysicsUniversity of the Free StateBloemfonteinRepublic of South Africa

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