Preparation and Photocatalytic Performance of Ag-Doped Titanium Dioxide Whiskers

2007 ◽  
Vol 336-338 ◽  
pp. 1910-1913
Author(s):  
Xing Jun Jiang ◽  
Yun Han Ling ◽  
Hong Yi Li ◽  
Xin De Bai
Keyword(s):  
Methylene Blue ◽  
Titanium Dioxide ◽  
Phase Composition ◽  
Photocatalytic Performance ◽  
Methylene Blue Degradation ◽  
Doped Tio2 ◽  
Treatment Conditions ◽  
Metatitanic Acid ◽  
Doped Titanium Dioxide ◽  
Doped Titania

Ag doped TiO2 whiskers were synthesized by calcining metatitanic acid with potassium car= bonate to form tetratitanate whisker precursor, following by proton-exchanged and immobilized with Ag+. The post treatment conditions for whiskers synthesis were investigated and the phase composition, morphology and photocatalytic performance were characterized. The results showed that the TiO2 whiskers had an aspect ratio more than 15 and the absorption edge of Ag doped titania whiskers were red shifted to 50 nm. The result of methylene blue degradation revealed that the photocatalytic performance of Ag doped TiO2 whisker has been greatly improved.

scholarly journals Facile synthesis of mesoporous titanium dioxide doped by Ag-coated graphene with enhanced visible-light photocatalytic performance for methylene blue degradation

RSC Advances ◽  
2017 ◽  
Vol 7 (41) ◽  
pp. 25314-25324 ◽  
Author(s):  
Lin Xiao ◽  
Li Youji ◽  
Chen Feitai ◽  
Xu Peng ◽  
Li Ming
Keyword(s):  
Methylene Blue ◽  
Titanium Dioxide ◽  
Visible Light ◽  
Photocatalytic Performance ◽  
Solvothermal Method ◽  
Sol Gel ◽  
Facile Synthesis ◽  
Methylene Blue Degradation ◽  
Visible Light Driven ◽  
Visible Light Photocatalytic

A highly efficient and elaborately structured visible-light-driven catalyst composed of mesoporous TiO2 (MT) doped with Ag+-coated graphene (MT-Ag/GR) has been successfully fabricated by a sol–gel and solvothermal method.

Preparation of Graphene and γ-Fe2O3 Doped Titanium Dioxide and its Photocatalytic Properties

2013 ◽  
Vol 295-298 ◽  
pp. 447-451 ◽  
Author(s):  
De Qiang Chen ◽  
Yang Li ◽  
Yi Qun Chen
Keyword(s):  
Methylene Blue ◽  
Titanium Dioxide ◽  
Visible Light ◽  
Degradation Rate ◽  
Absorption Rate ◽  
Methylene Blue Degradation ◽  
Nano Powder ◽  
Doped Titanium Dioxide ◽  
Recycle Rate ◽  
Nano Titanium Dioxide

In this paper graphene is used to improve absorption rate of nano-titanium dioxide under visible light, meanwhile titanium dioxide is doped with superparamagnetism nano-powder of γ-Fe2O3 to modify the recovery of the photocatalyst. Gradually the increasing content of grapheme promotes the removal efficiency and correspondingly. Excitation condition is reduced and the photocatalysis property under visible light is improved and recycle rate of the titanium dioxide is effective promoted after the dispose. The effect of photocatalytic degradation of methylene blue is used to evaluate the photocatalytic activity. The methylene blue degradation rate raised from 53.4% to 85.9% with the increasing graphene load from 5% to 20% under visible light. The degradation efficiency of methylene blue decreased to 15% without the graphene load. The recovery rate of the photocatalyst can achieve 95% above. Graphene oxide works as the electron acceptor and photosensitizer to efficiently enhance the dye photodecomposition.

scholarly journals Synthesis of Silver Doped Titanium Dioxide by Wet-Ball Milling Sol–Gel Method for Antibacterial Application

2021 ◽  
Vol 333 ◽  
pp. 11002
Author(s):  
Tippabust Eksangsri ◽  
Chaweewan Sapcharoenkun ◽  
Siripond Phromma
Keyword(s):  
Methylene Blue ◽  
Particle Size ◽  
Antibacterial Activity ◽  
Titanium Dioxide ◽  
Photocatalytic Activity ◽  
Surface Area ◽  
Degradation Rate ◽  
Sol Gel ◽  
Methylene Blue Degradation ◽  
Doped Titanium Dioxide

Titanium dioxide (TiO2) has been extensively studied as photo-catalyst for water treatment, air purification and antibacterial applications due to its challenging properties such as chemical stability, environmental friendly and strong photocatalytic activity. However, the limitation of TiO2 on its dependent to ultraviolet radiation for photocatalytic activity is still aroused. In this study, silver doped titanium dioxide (Ag-TiO2) was synthesized by wet-ball milling sol–gel method (WBMS). Ag-TiO2 molar ratio was varied from 0% to 10% to study the effect of silver content on the synthesized Ag-TiO2 characteristics and the ability to apply on antibacterial applications. The objective of this work was to find an optimal concentration of Ag in Ag-TiO2. Characterization of the particle size, morphology, and surface area of synthesized Ag-TiO2 were discussed by techniques of transmission electron microscopy (TEM) and Brunauer-Emmett-Teller (BET). Photocatalytic activity was investigated from degradation of methylene blue. Antibacterial activity was conducted by finding minimum inhibitory concentration (MIC) and minimum bactericidal concentration (MBC) tests performed on Escherichia coli (E. coli) and Staphylococcus aureus (S. aureus) under dark condition and under visible light. The results demonstrated that the doping of Ag inhibited crystal growth of Ag-TiO2. The smallest particle size and the highest surface area were obtained from 5% Ag-TiO2. Also, it was found that methylene blue degradation rate increased to the highest number of 1.62x10−3 min−1 when Ag concentration reached 5%, and methylene blue degradation rate reduced when Ag concentration was higher than 5%. The antibacterial activity of Ag-TiO2 was better than TiO2. The optimal concentration of 3-5% Ag-TiO2 was observed from the MIC and MBC tests.

Increasing Rutile Phase Amount in Chromium-Doped Titania by Simple Stirring Approach for Photodegradation of Methylene Blue under Visible Light

2015 ◽  
Vol 68 (7) ◽  
pp. 1129 ◽  
Author(s):  
Pei Wen Koh ◽  
Leny Yuliati ◽  
Hendrik O. Lintang ◽  
Siew Ling Lee
Keyword(s):  
Methylene Blue ◽  
Visible Light ◽  
Band Gap ◽  
Rutile Phase ◽  
Band Gap Energy ◽  
Synthesis Process ◽  
Doped Tio2 ◽  
Gap Energy ◽  
Stirring Time ◽  
Doped Titania

The amount of rutile phase in chromium-doped titania photocatalyst was controlled by varying stirring time (0.5–2.0 h) at room temperature during a sol–gel synthesis process. The percentage of rutile phase increased from 15.1 % to 28.6 % when stirring time was prolonged from 0.5 to 1.5 h. Further increases in the stirring time had negligible effect on the rutile phase amount. As evidenced by analyses using diffuse reflectance ultraviolet–visible spectroscopy and X-ray photoelectron spectroscopy, a sufficient stirring time was important for more substitution of Cr3+ for Ti4+ in the lattice, resulting in anatase-to-rutile phase transformation. The formation of more rutile phase in Cr-doped TiO2 not only reduced the band gap energy, but also induced surface defects that retarded electron–hole recombination. It has been demonstrated that the Cr-doped TiO2 prepared with a stirring time of 1.5 h possessed the lowest band gap energy of 1.89 eV, and hence it achieved the highest photodegradation of methylene blue under visible light irradiation.

Hydrothermally derived nanosized Ni-doped TiO2: A visible light driven photocatalyst for methylene blue degradation

2010 ◽  
Vol 124 (2-3) ◽  
pp. 976-981 ◽  
Author(s):  
G.G. Nakhate ◽  
V.S. Nikam ◽  
K.G. Kanade ◽  
S. Arbuj ◽  
B.B. Kale ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Visible Light ◽  
Methylene Blue Degradation ◽  
Doped Tio2 ◽  
Visible Light Driven

Enhanced sunlight photocatalytic performance of Sn-doped ZnO for Methylene Blue degradation

2011 ◽  
Vol 335 (1-2) ◽  
pp. 145-150 ◽  
Author(s):  
Jian-Hui Sun ◽  
Shu-Ying Dong ◽  
Jing-Lan Feng ◽  
Xiao-Jing Yin ◽  
Xiao-Chuan Zhao
Keyword(s):  
Methylene Blue ◽  
Photocatalytic Performance ◽  
Methylene Blue Degradation ◽  
Doped Zno
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