Efficient hybrid bionanocomposites based on iron-modified TiO 2 for dye degradation via an adsorption-photocatalysis syn
- PDF / 3,522,993 Bytes
- 10 Pages / 595.276 x 790.866 pts Page_size
- 104 Downloads / 155 Views
RESEARCH ARTICLE
Efficient hybrid bionanocomposites based on iron-modified TiO2 for dye degradation via an adsorption-photocatalysis synergy under UV-Visible irradiations Soulaima Chkirida 1,2 & Nadia Zari 1 & Redouane Achour 2 & Abou el kacem Qaiss 1 & Rachid Bouhfid 1 Received: 22 July 2020 / Accepted: 12 November 2020 # Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract To overcome the titanium oxide limitations, Fe2O3- and Fe3O4-modified TiO2 (3:1) nanoparticles were synthesized by a humid and solid path, respectively. These nanoparticles were embedded in sodium alginate biopolymer to prepare beads with efficient adsorption and photocatalytic behaviors in cationic dye degradation under both UV and visible irradiations. Operating conditions were investigated such as initial methylene blue (MB) concentration and contact time to evaluate their impact on the process. The bead recycling was also scrutinized. We have come to the conclusion that Fe2O3-modified TiO2-Alg displayed superiorities, including expanded responsive wavelength range in the visible region (up to 700 nm), narrower band gap (1.79 eV), and better efficiency for MB removal in terms of adsorption capacities and photocatalytic effectiveness under both UV and visible irradiations. Furthermore, these beads can be effortlessly recovered from the reaction medium after the photocatalytic process and reused up to 5 cycles without any noteworthy decline in their initial properties. Keywords Iron oxides . Titanium dioxide . Alginate . Photodegradation . Visible response . Biopolymer
Introduction Almost 50 years ago, photocatalysis by semiconductors has received widespread attention in numerous application fields and research, including environmental remediation and water purification. Due to the Honda-Fujishima effect outburst, titanium dioxide (TiO2) has been broadly studied and commercially made available as a material making use of light energy for chemical reaction boost and promotion (Fujishima 1972; Ibrahim and Halim 2008). However, among the major setbacks of TiO2 photocatalyst large-scale application are their wide band gap (3–3.2 eV). In fact, only ultraviolet light is adept for the Responsible Editor: Sami Rtimi * Rachid Bouhfid [email protected] 1
Composites and Nanocomposites Center, Moroccan Foundation for Advanced Science, Innovation and Research (MAScIR), Rabat Design Center, Rue Mohamed El Jazouli, Madinat El Irfane, 10100 Rabat, Morocco
2
Laboratory of Heterocyclic Organic Chemistry, Faculty of Sciences, University Mohammed V, Rabat, Morocco
photocatalytic simulation. To prevail over this obstacle and improve the catalyst efficiency, modification of TiO2 by another element’s implantation is necessary for a significantly enhanced visible light response. In this vein, a vast amount of visible light– responsive hybrid photocatalysts with narrow bandgaps were reported (Zaleska 2008) (Tahir et al. 2016). Among them, iron oxide–based semiconductors have been mainly studied. Basically, iron oxides are commonly well-known f
Data Loading...
