scholarly journals Acesulfame K Photodegradation over Nitrogen-Doped TiO2

Catalysts ◽  
2021 ◽  
Vol 11 (10) ◽  
pp. 1193
Author(s):  
Katarzyna Pstrowska ◽  
Hanna Czapor-Irzabek ◽  
Daniel Borowiak ◽  
Ewa Burchacka
Keyword(s):  
Electrostatic Interactions ◽  
Lattice Structure ◽  
Sol Gel ◽  
Photogenerated Electron ◽  
One Pot ◽  
Doped Tio2 ◽  
Nitrogen Doped ◽  
Photodegradation Efficiency ◽  
Tio2 Lattice ◽  
Hole Charge

Acesulfame K is a zero-calorie alternative to sugar used worldwide. There is contradictory information on the toxicity of the compound, but its accumulation in the aquatic environment is undeniable. In this study, one-pot sol-gel synthesis was used to obtain nitrogen-doped TiO2 photocatalysts. Doping up to 6.29 wt % of nitrogen caused an increase in the surface area of the catalysts (48.55–58.23 m2∙g−1) and a reduction of the pHPZC value (5.72–5.05). Acesulfame K photodegradation was tested at the initial concentration of 20–100 ppm and the catalyst concentration at the level of 1 g∙L−1. Compared to the pure anatase, 4.83–6.29 wt % nitrogen-doped TiO2 showed an effective photodegradation of Acesulfame K. Ninety percent molecule removal was obtained after ~100 min, ~90 min, and ~80 min for initial concentrations of 20 ppm, 50 ppm, and 100 ppm, respectively. The increased activity of the catalysts is due to the modification of the TiO2 lattice structure and probably the limitation of the photogenerated electron/hole charge carrier recombination. It was shown that the electrostatic interactions between Acesulfame K and the catalyst surface play an important role in the photodegradation efficiency.

scholarly journals Recent Advances in Synthesis and Applications of Carbon-Doped TiO2 Nanomaterials

Catalysts ◽  
2020 ◽  
Vol 10 (12) ◽  
pp. 1431
Author(s):  
Li Hua ◽  
Zhengliang Yin ◽  
Shunsheng Cao
Keyword(s):  
Separation Efficiency ◽  
Photogenerated Electron ◽  
Wide Bandgap ◽  
Electron Hole ◽  
Doped Tio2 ◽  
Carbon Doped ◽  
Tio2 Lattice ◽  
Promising Tool ◽  
Tio2 Nanomaterials ◽  
Catalytic Fields

TiO2 has been widely used as a photocatalyst and an electrode material toward the photodegradation of organic pollutants and electrochemical applications, respectively. However, the properties of TiO2 are not enough up to meet practical needs because of its intrinsic disadvantages such as a wide bandgap and low conductivity. Incorporation of carbon into the TiO2 lattice is a promising tool to overcome these limitations because carbon has metal-like conductivity, high separation efficiency of photogenerated electron/hole pairs, and strong visible-light absorption. This review would describe and discuss a variety of strategies to develop carbon-doped TiO2 with enhanced photoelectrochemical performances in environmental, energy, and catalytic fields. Emphasis is given to highlight current techniques and recent progress in C-doped TiO2-based materials. Meanwhile, how to tackle the challenges we are currently facing is also discussed. This understanding will allow the process to continue to evolve and provide facile and feasible techniques for the design and development of carbon-doped TiO2 materials.

scholarly journals Modeling and Experimental Studies on Adsorption and Photocatalytic Performance of Nitrogen-Doped TiO2 Prepared via the Sol–Gel Method

Catalysts ◽  
2020 ◽  
Vol 10 (12) ◽  
pp. 1449
Author(s):  
Zhuoying Jiang ◽  
Sameera Wickramasinghe ◽  
Yu Hsin Tsai ◽  
Anna Cristina S. Samia ◽  
David Gurarie ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Tio2 Nanoparticles ◽  
Sol Gel ◽  
Degree Of Crystallinity ◽  
Chemical Compositions ◽  
Gel Method ◽  
Doped Tio2 ◽  
Sol Gel Method ◽  
Nitrogen Doped ◽  
The Impact

Nitrogen-doped TiO2 has a great potential as a photocatalyst under visible light irradiation with applications in the removal of air and water pollutants, and the treatment of bacterial contaminations. In this study, nitrogen-doped TiO2 nanoparticles were synthesized via the sol–gel method and a post-annealing heat treatment approach. The effects of annealing treatment on the photocatalyst crystalline size and degree of crystallinity were analyzed. Methylene blue dye was used as the model water contaminant for the evaluation of the photoactivity of the synthesized nitrogen-doped TiO2 nanoparticles. The degradation of methylene blue was attributed to three mechanisms, i.e., adsorption, photocatalysis, and direct light photolysis. A kinetic model was developed to distinguish the impact of these three different mechanisms on the removal of contaminants. Adsorption and photocatalysis are heterogeneous processes for removing water organic contaminants. The characterization analysis demonstrates that they are relevant to the microstructures and surface chemical compositions of nitrogen-doped TiO2 photocatalysts. The processing–structure–performance relationship helped to determine the optimal processing parameters for nitrogen-doped TiO2 photocatalyst to achieve the best performance. While we used methylene blue as the model contaminant, the generalized quantitative model framework developed in this study can be extended to other types of contaminants after proper calibration.

Highly Visible Light Activity of Nitrogen Doped TiO2 Prepared by Sol–Gel Approach

2016 ◽  
Vol 46 (1) ◽  
pp. 158-166 ◽  
Author(s):  
Le Dien Than ◽  
Ngo Sy Luong ◽  
Vu Dinh Ngo ◽  
Nguyen Manh Tien ◽  
Ta Ngoc Dung ◽  
...  
Keyword(s):  
Visible Light ◽  
Sol Gel ◽  
Doped Tio2 ◽  
Nitrogen Doped ◽  
Light Activity

One-pot synthesis of nitrogen-doped TiO2 nanorods with anatase/brookite structures and enhanced photocatalytic activity

CrystEngComm ◽  
2012 ◽  
Vol 14 (22) ◽  
pp. 7662 ◽  
Author(s):  
Ligang Gai ◽  
Xiuquan Duan ◽  
Haihui Jiang ◽  
Qinghu Mei ◽  
Guowei Zhou ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Tio2 Nanorods ◽  
One Pot ◽  
Doped Tio2 ◽  
Nitrogen Doped ◽  
One Pot Synthesis

scholarly journals Synthesis and Characterization of Pure and Nitrogen Doped Titanium Oxide Nanocrystallites for Visible Light Photocatalytic Applications

2021 ◽  
Vol 33 (4) ◽  
pp. 853-858
Author(s):  
R. Girija ◽  
S. Stella Mary ◽  
G. Balakrishnan
Keyword(s):  
Visible Light ◽  
Titanium Oxide ◽  
Energy Gap ◽  
Anatase Phase ◽  
Sol Gel ◽  
Blue Dye ◽  
Hydroxyl Groups ◽  
Band Shift ◽  
Doped Tio2 ◽  
Nitrogen Doped

The pure and nitrogen doped titanium oxide (TiO2) nanocrystallites were synthesized using sol-gel technique. The synthesized nanoparticles were characterized to examine the microstructural, optical and photocatalytic properties. The XRD studies of pure and doped TiO2 showed the formation of polycrystalline tetragonal structure with anatase phase. The crystallite sizes were calculated and found to be 17 and 15 nm for the pure and N-doped TiO2, respectively. FTIR studies indicated that the N-doped TiO2 bands are stronger compared with pure TiO2, indicating the more hydroxyl groups. FESEM studies showed the uniform formation of TiO2 nanocrystallites and spherical in shape with agglomeration. The photoluminescence spectra of the samples show emission peaks, indicating the band to band shift having the energy gap of 2.9 eV. The photocatalytic performance of the nanocatalyst was studied using methylene blue dye under visible light irradiation for 90 min. The photocatalytic efficiency of 66.9% and 85.8% is obtained for the pure and N-doped TiO2, respectively.

scholarly journals Electrospun Nitrogen-doped TiO2 Nanofibrous Thin Film for Photovoltaic Application

2019 ◽  
Vol 8 (4) ◽  
pp. 6994-7000
Keyword(s):  
Thin Film ◽  
Visible Light ◽  
Sol Gel ◽  
Photovoltaic Cell ◽  
Titanium Isopropoxide ◽  
Tio2 Particle ◽  
Doped Tio2 ◽  
Nitrogen Doped ◽  
Doctor Blade ◽  
Tio2 Nanofiber

This research study aims at fabrication of fine size nitrogen doped TiO2 nanofiber using electrospinning method and evaluation of the performance of TiO2 in a photovoltaic cell under visible light irradiation. Undoped and N doped TiO2 nanoparticles were synthesized by sol gel method where titanium isopropoxide was used as the source of TiO2 and ammonium nitrate was used as the source of N dopant. TiO2 /PVA composite material was prepared by stabilizing TiO2 particle in to 10 wt % of PVA (aq) solution in order to prepare thin film that can be coated on photovoltaic (PV) cells. Coating of solid thin film PV cells by TiO2 /PVA nanofibers was conducted using electrospinning and doctor blade method. In both systems, doping the TiO2 with nitrogen improved its optical properties which it successfully lowered the band gap energy from 3.14 to 2.76 eV and shifted its optical response to the visible light region. The presence of O-H stretching vibration, O-H bending and vibration of the N-Ti bond contributed to an increased performance of the PV cells. The electrospun N-doped TiO2 produced better power output than doctor blade method coated PV cells with power of 0.040 and 0.026 mW, respectively.

scholarly journals Fe-doped TiO2/Kaolinite as an Antibacterial Photocatalyst under Visible Light Irradiation

2021 ◽  
Vol 16 (2) ◽  
pp. 293-301
Author(s):  
Anthoni B. Aritonang ◽  
Eka Pratiwi ◽  
Warsidah Warsidah ◽  
S. I. Nurdiansyah ◽  
R. Risko
Keyword(s):  
Visible Light ◽  
Band Gap ◽  
Visible Light Irradiation ◽  
Sol Gel ◽  
Light Irradiation ◽  
Wave Number ◽  
Crystal Lattices ◽  
Doped Tio2 ◽  
Tio2 Lattice ◽  
Kaolinite Surface

In this work, undoped and Fe-doped TiO2 immobilized on kaolinite surface was successfully synthesized by sol-gel method with various Fe concentrations (0.05, 0.125, and 0.25 wt%). The effects of Fe doping into TiO2 lattice were thoroughly investigated by a diffuse reflectance UV-visible (DRS) spectroscopy, Fourier Transform Infrared (FTIR) spectroscopy, and X-ray diffraction (XRD). The optical band gap of undoped and Fe-doped TiO2/kaolinite is red shifted with respect to the incorporation of Fe3+ into the structure of TiO2 resulted band gap. The FTIR spectra shows a shift of peak at the wave number at 586 cm−1 and 774 cm−1 which is attribute of the Fe−O vibration as an indication of the formation of Fe-TiO2 bonds. Incorporation of Fe3+ cation into the TiO2 lattice replacing the Ti4+ ions, which induced a perturbation in anatase crystal structure, causes the change in the distance spacing of the crystal lattices dhkl(101) of 8.9632 to 7.9413. The enhanced photocatalytic performance was observed for Fe-doped TiO2/kaolinite compared with TiO2/kaolinite with respect to Escherichia coli growth inhibition in solution media under visible light irradiation. Copyright © 2021 by Authors, Published by BCREC Group. This is an open access article under the CC BY-SA License (https://creativecommons.org/licenses/by-sa/4.0).  

scholarly journals The Vibrational Spectroscopy of the Valence Bonds of Cu-Doped TiO2 Using Electronegativity Principle Quantitative Calculations

2020 ◽  
Vol 2020 ◽  
pp. 1-11
Author(s):  
Ji-Kang Yan ◽  
Jun-Yu Chen ◽  
Guo-You Gan
Keyword(s):  
Anatase Phase ◽  
Sol Gel ◽  
Rutile Phase ◽  
Interstitial Position ◽  
Doped Tio2 ◽  
Tio2 Lattice ◽  
Transmission Electron ◽  
The Matrix ◽  
Xrd Phase Analysis ◽  
Diffraction Patterns

The purpose of this study is to investigate the influence of Cu on TiO2 phase transformation and regioselectivity. TiO2 samples doped with different amounts of Cu2+ ions were synthesized by the sol-gel method. The phase and vibrational mode were characterized by X-ray diffraction (XRD), Fourier infrared spectroscopy (FTIR), and transmission electron microscope (TEM). The XRD phase analysis shows that the lattice parameters have not changed after Cu incorporation. In addition, the content of rutile increased obviously after Cu doping. This indicated that the addition of Cu obviously promoted the transformation from anatase phase to rutile phase. The vibration frequencies were calculated based on the principle of electronegativity. All types of bonds were qualitatively and quantitatively analyzed. The content of TiA-O, TiR-O, and H-O in the undoped TiO2 samples is 23.87%, 16.30%, and 7.41%, respectively. In the same way, the content of TiA-O, TiR-O, H-O, Cu A i -O, and Cu R i -O in the 2.5 mol%Cu-doped TiO2 samples is 21.23%, 18.56%, 7.34%, and 0.98%, respectively. For the 5 mol%Cu-doped TiO2 samples, the content of TiA-O, TiR-O, H-O, Cu A i -O, Cu R i -O, Cu A s -O, and Cu R s -O is 18.75%, 20.11%, 7.47%, 2.56%, 3.9%, 1.55%, and 2.35%, respectively. Cu was not present at substitutional sites in the 2.5 mol% doped sample, but Cu was present in the 2.5 mol% doped sample. It is indicated that Cu was more likely to exist in the form of interstitial position in the TiO2 lattice, with the number of Cu atoms in the interstitial position reaching saturation, and this forced Cu to replace Ti. The TEM shows that the stripes of different periods and orientations overlapped each other to form the Moiré patterns. In addition, the diffraction patterns of the Moiré image were slightly different from that of the matrix. The Cu replaced Ti position and the Cu atoms mixed into interstitial sites in the TiO2 lattice. The theoretical calculation was consistent with the experimental results.

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