Effect of Annealing Temperature on Structural Phase Transformations and Band Gap Reduction for Photocatalytic Activity o
- PDF / 2,825,280 Bytes
- 11 Pages / 595.276 x 790.866 pts Page_size
- 29 Downloads / 197 Views
Effect of Annealing Temperature on Structural Phase Transformations and Band Gap Reduction for Photocatalytic Activity of Mesopores TiO2 Nanocatalysts Sirajul Haq1,2 · Wajid Rehman3 · Muhammad Waseem4 · Vera Meynen2 · Saif Ullah Awan5 · Abdul Rehman Khan1 · Shahzad Hussain6 · Zain‑ul‑Abdin1 · Salah Ud Din1 · Muhammad Hafeez1 · Naseem Iqbal7 Received: 9 August 2020 / Revised: 26 October 2020 / Accepted: 5 November 2020 © Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract The titanium dioxide nanocatalyst ( TiO2:NC) was fabricated by chemical precipitation method and annealed at different temperatures. The texture parameters was estimated by Barrett–Joyner–Halenda (BJH) and Brunauer–Emmett–Teller (BET) utilizing nitrogen adsorption–desorption data. The crystal phase transition, enhanced crystallinity and increase in crystallite sizes with temperature were studied by using X-ray diffractograms (XRD). Coinciding with an increase in crystallite size supervising annealing temperatures, the surface area of the TiO2:NC decreases. The average grain size as calculated from scanning electron microscopy (SEM) initially decreases with increasing annealing temperature (300 °C), whereas further increase in annealing temperature (600 °C), is accompanied by the increase in grain size. A red shift was observed in the diffuse reflectance spectra (DRS) caused by a decrease in band gap energy with rising annealing temperatures. The chemical composition was examined by using Fourier transform infrared (FTIR) and energy dispersive X-ray (EDX) spectroscopies. All the annealed T iO2:NC samples were used as photocatalysts for the degradation of rhodamine 6G (R6G) under simulated solar light source. The TiO2:NC annealed at 600 °C have a higher degradation rate constant than the other samples. Keywords Nanocatalyst · Photocatalysis · Photodegradation · Rhodamine · Mesoporous · Crystallinity
1 Introduction * Sirajul Haq [email protected] 1
Department of Chemistry, University of Azad Jammu and Kashmir, Muzaffarabad 13100, Pakistan
2
Laboratory of Adsorption and Catalysis, University of Antwerp, Universiteitsplein 1, 2610 Wilrijk, Belgium
3
Department of Chemistry, Hazara University, Mansehra 21300, Pakistan
4
Department of Chemistry, COMSATS University Islamabad (CUI), Islamabad, Pakistan
5
Department of Electrical Engineering, NUST College of EME, National University of Sciences and Technology (NUST), Islamabad 44000, Pakistan
6
Department of Physics, COMSATS University Islamabad (CUI), Islamabad, Pakistan
7
US‑Pakistan Centre for Advanced Studies in Energy, National University of Sciences and Technology (NUST), Islamabad 44000, Pakistan
Many organic pollutants are released to environment along with industrial wastes, heavy metals, pigments and dyes. Among these pollutants, the organic dyes are of particular interest. Moreover, they can be toxic and can have mutagenic, tetragenic and carcinogenic effects on the living components of ecosystem even at low concentration [1]. These poll
Data Loading...
