Nanosized N-doped TiO2 and gold modified semiconductors — photocatalysts for combined UV–visible light destruction of oxalic acid in aqueous solution

Desalination ◽  
2010 ◽  
Vol 260 (1-3) ◽  
pp. 101-106 ◽  
Author(s):  
V. Iliev ◽  
D. Tomova ◽  
S. Rakovsky
Keyword(s):  
Aqueous Solution ◽  
Oxalic Acid ◽  
Visible Light ◽  
Doped Tio2 ◽  
Uv Visible

Visible-Light Activity of N-Doped TiO2 Powders and their Applications

2007 ◽  
Vol 544-545 ◽  
pp. 167-170 ◽  
Author(s):  
Wen Bin Cao ◽  
Yi Wei ◽  
Yan Hong Li ◽  
Xiao Ning Zhang
Keyword(s):  
Aqueous Solution ◽  
Visible Light ◽  
Visible Light Irradiation ◽  
Guanidine Hydrochloride ◽  
Anatase Tio2 ◽  
Light Irradiation ◽  
Latex Paint ◽  
Doped Tio2 ◽  
Light Activity ◽  
Xrd Patterns

Nitrogen-doped TiO2 has been prepared by calcining technical grade guanidine hydrochloride and commercial anatase TiO2 powders. XRD patterns indicate that the prepared powders are composed of anatase. XPS results show that N atoms have been incorporated into the lattice of anatase. UV-Vis reflectance spectra show that the light absorption of the synthesized N-doped anatase powders has red-shifted well into visible-light region. Degradation of methylene blue (MB) aqueous solution by N-doped anatase has been investigated by UV-Vis light spectrophotometer. The 400-mL 10 mg/L aqueous solution of MB could be degraded with 4 g N-doped TiO2 within 4.5 hrs of visible light irradiation. Photocatalytic paint was prepared by adding the synthesized N-doped nanocrystalline anatase TiO2 powders into self-engineered oxidation resistance latex paint system. The effects of the amount and types of the TiO2 in the paints on the sterilization were systematically investigated. The colony counting method was used to study its sterilization performance under visible light irradiation. The sterilization experiments show that the rate of sterilizing E. coli by the N-doped TiO2 modified paint can exceed more than 99% after irradiation by the visible light for 2 to 4 hours.

Photocatalytic Degradation of Methylene Blue Aqueous Solution under Visible Light Irradiation by Using N-Doped Titanium Dioxide

2007 ◽  
Vol 336-338 ◽  
pp. 1972-1975 ◽  
Author(s):  
Yan Hong Li ◽  
Wen Bin Cao ◽  
Fan Yong Ran ◽  
Xiao Ning Zhang
Keyword(s):  
Aqueous Solution ◽  
Methylene Blue ◽  
Visible Light ◽  
Visible Light Irradiation ◽  
Guanidine Hydrochloride ◽  
Visible Region ◽  
High Photocatalytic Activity ◽  
Light Irradiation ◽  
Nanocrystalline Tio2 ◽  
Doped Tio2

N-doped TiO2 powders with high photocatalytic activity under visible-light irradiation have been prepared by calcining anatase nanocrystalline TiO2 powders and guanidine hydrochloride at 350 °C, 450 °C, 550 °C and 650 °C with the holding time ranged from 1.5 h to 3 h, respectively. The guanidine hydrochloride content was varied from 1 to 6 M for the experiments. XRD patterns indicate that all the powders are anatase crystalline phase. The specific surface area is 25~45 m2/g measured by BET method. XPS results show that N atoms were incorporated into the lattice of TiO2 and the amount of N doped in TiO2 is reached up to 8.26 at%. UV-Vis absorption spectra show that the absorption edge of the synthesized N-doped TiO2 powders, calcined at 350 °C for 2.5 h, has red-shifted well into visible region up to 700 nm. Degradation of methylene blue (MB) aqueous solution has been investigated by UV-Vis light spectrophotometer. The 400-mL 10 mg/L aqueous solution of methylene blue could be degraded completely with 4 g N-doped TiO2 within 4.5 h of visible light irradiation.

scholarly journals Synthesis of Porous N-doped TiO2 by Using Peroxo Sol-Gel Method for Photocatalytic Reduction of Cd(II)

2021 ◽  
Vol 17 (1) ◽  
pp. 103-112
Author(s):  
Diana Vanda Wellia ◽  
Dina Nofebriani ◽  
Nurul Pratiwi ◽  
Safni Safni
Keyword(s):  
Aqueous Solution ◽  
Photocatalytic Activity ◽  
Visible Light ◽  
Sol Gel ◽  
Photocatalytic Reduction ◽  
Gel Method ◽  
Doped Tio2 ◽  
Sol Gel Method ◽  
Catalytic Active Site ◽  
Bet Analysis

Porous N-doped TiO2 photocatalyst was successfully synthesized by an environmentally friendly peroxo sol-gel method using polyethylene glycol (PEG) as a templating agent. Here, the effect of PEG addition to the aqueous peroxotitanium solutions on the structure, pore properties and photocatalytic activity of the obtained photocatalysts was systematically studied. The prepared photocatalysts were characterized by X-ray diffraction (XRD), UV-Vis diffuse reflectance spectroscopy (DRS), and Brunauer-Emmett-Teller (BET). It was found that the doping of nitrogen narrows the band gap of TiO2 leading to enhance its visible-light response. The BET analysis shows that the prepared photocatalysts have a typical mesoporous structure with pore sizes of 3–6 nm. The photocatalytic activity of the prepared photocatalysts was evaluated by photocatalytic reduction of Cd(II) in an aqueous solution under visible light irradiation. The results show that porous N-doped TiO2 with the optimal PEG addition had the highest Cd(II) reduction of 85.1% after 2.5 h irradiation in neutral aqueous solution. This significant improvement in photocatalytic activity of the prepared photocatalysts was mainly attributed to the synergistic combination of N doping and porous structure, which could actively increase the catalytic active site of this photocatalysts. 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). 

Photocatalytic degradation and pathway of oxytetracycline in aqueous solution by Fe2O3–TiO2 nanopowder

RSC Advances ◽  
2015 ◽  
Vol 5 (51) ◽  
pp. 40764-40771 ◽  
Author(s):  
Rong Li ◽  
Yuefa Jia ◽  
Jun Wu ◽  
Qiang Zhen
Keyword(s):  
Aqueous Solution ◽  
Visible Light ◽  
Photocatalytic Degradation ◽  
Uv Visible ◽  
Tio2 Nanopowder

After photocatalytic degradation under UV/visible light by Fe2O3/TiO2 composites, the naphthol ring of oxytetracycline (C22H24N2O9) destructed to a partial ring-ruptured structure, such as C9H6O4.

UV–Visible Light Driven Photocatalytic Degradation of Ciprofloxacin by N,S Co-doped TiO2: The Effect of Operational Parameters

2020 ◽  
Vol 63 (11-14) ◽  
pp. 985-995 ◽  
Author(s):  
Linh Thuy Nguyen ◽  
Hanh Thi Nguyen ◽  
Thanh-Dong Pham ◽  
Trinh Dinh Tran ◽  
Hoan Thi Chu ◽  
...  
Keyword(s):  
Visible Light ◽  
Photocatalytic Degradation ◽  
Operational Parameters ◽  
Doped Tio2 ◽  
Visible Light Driven ◽  
Uv Visible ◽  
Co Doped
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