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.

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.

scholarly journals MODIFICATION OF TITANIUM DIOXIDE NANOMATERIALS BY SULFUR FOR PHOTOCATALYTIC DEGRADATION OF METHYLENE BLUE EVEN UNDER VISIBLE LIGHT

2018 ◽  
Vol 54 (2A) ◽  
pp. 164
Author(s):  
Nguyen Tan Lam
Keyword(s):  
Methylene Blue ◽  
Titanium Dioxide ◽  
Photocatalytic Activity ◽  
Visible Light ◽  
Photocatalytic Degradation ◽  
Sodium Sulfate ◽  
High Photocatalytic Activity ◽  
Doped Titanium Dioxide ◽  
Modification Of Titanium ◽  
Very High

This paper presents a study on preparation of sulfur doped titanium dioxide using potassium fluorotitanate and sodium sulfate as precursors. The obtained results indicated that the doped TiO2 exhibited very high photocatalytic activity for degradation of methylene blue even under visible light. The increasing in the added sulfur amounts led to significantly increase in the degradation of methylene blue. When the S/TiO2 mole ratios increased from 10 to 25%, the degradation of methylene blue under compact light increased from 30.87% to 67.06%, respectively.

scholarly journals Synthesis of TiO2/g-C3N4 material for visble light driven photocatalytic degradation of methylene blue

2020 ◽  
Vol 9 (3) ◽  
pp. 21-26
Author(s):  
Hoa Dang Thi Ngoc ◽  
Tu Nguyen Thi Thanh
Keyword(s):  
Methylene Blue ◽  
Titanium Dioxide ◽  
Visible Light ◽  
Diffuse Reflectance Spectroscopy ◽  
Pure Tio2 ◽  
X Ray Diffraction ◽  
Methylene Blue Degradation ◽  
Light Region ◽  
Visible Light Driven ◽  
Kinetics Of

In this study, an efficient strategy for the synthesis of solvent titanium dioxide and titanium dioxide/graphitic carbon nitride (TiO2/g-C3N4) heterostructure photocatalyst was applied to fabricate a kind of visible-light-driven photocatalyst. The obtained samples were  characterised  by  means of  X-ray diffraction, infrared spectroscopy, ultraviolet–visible spectroscopy, ultraviolet-visible diffuse reflectance spectroscopy and photoluminescence. The heterostructure shows higher absorption edge towards harvesting more solar energy compared with pure TiO2 and pure g-C3N4 respectively. The  photocatalytic  behaviour  under  visible light  and  kinetics of  the TiO2/g-C3N4 catalyst via methylene blue degradation were addressed. The results showed that the introduction of solvent titanium dioxide  into g-C3N4 enhanced  the  photocatalytic activity in  the  visible  light region.  TiO2/g-C3N4 is  potential  visible  light  driven photocatalyst  for  the  organic substances degradation in aqueous solutions.

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.

Removal of naphthalene from aqueous solutions by phosphorus doped-titanium dioxide coated on silica phosphoric acid under visible light

2021 ◽  
Vol 224 ◽  
pp. 187-196
Author(s):  
Bahman Banaei ◽  
Amir Hessam Hassani ◽  
Farhang Tirgir ◽  
Abdolmajid Fadaei ◽  
Seyed Mehdi Borghaei
Keyword(s):  
Titanium Dioxide ◽  
Phosphoric Acid ◽  
Aqueous Solutions ◽  
Visible Light ◽  
Doped Titanium Dioxide ◽  
Phosphorus Doped
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