Characterization of Anodized Titanium Oxide Film and Photocatalytic Decomposition of Methylene Blue with Microcurrent

2007 ◽  
Vol 10 (2) ◽  
Author(s):  
Sojeong Ahn ◽  
Lang-kyu Choi ◽  
Jihoon Jung
Keyword(s):  
Binding Capacity ◽  
Sol Gel ◽  
Photocatalytic Decomposition ◽  
Photocatalytic Reaction ◽  
Photocatalytic Efficiency ◽  
Titanium Oxide Film ◽  
Low Efficiency ◽  
Anodized Titanium ◽  
Supporting Materials

AbstractSol-gel coating that is commonly used in photocatalyst immobilization has low binding capacity with supporting materials and low photocatalytic efficiency due to reduction of surface area of catalysts. In addition, the recombination of electrons and holes is an important reason of low efficiency in photocatalytic reaction. To solve such problems, our study devised a TiO

Sol-gel synthesis and characterization of TiO2-CdO-Ag nanocomposite with superior photocatalytic efficiency

2018 ◽  
Vol 44 (4) ◽  
pp. 4292-4297 ◽  
Author(s):  
Ardalan Azimi-Fouladi ◽  
S.A. Hassanzadeh-Tabrizi ◽  
A. Saffar-Teluri
Keyword(s):  
Sol Gel ◽  
Synthesis And Characterization ◽  
Photocatalytic Efficiency ◽  
Sol Gel Synthesis

scholarly journals Preparation and Photocatalytic Characterization of Modified TiO2/Nd/rice Husk Ash Nanomaterial for Rifampicin Removal in Aqueous Solution

2021 ◽  
Author(s):  
Thuy Dang Thi Ngoc ◽  
Ha Nguyen Thi ◽  
Anh Ngo Van ◽  
Sen Nguyen Thi ◽  
Dung Nguyen Duc ◽  
...  
Keyword(s):  
Rice Husk ◽  
Rice Husk Ash ◽  
Sol Gel ◽  
Solar Irradiation ◽  
Photocatalytic Decomposition ◽  
Structure Characteristic ◽  
Lower Efficiency ◽  
Residue Decomposition ◽  
First Order Kinetics

Abstract The neodymium doping of titanium dioxide with content of Nd varying from 0.01 to 0.8% was conducted by the sol-gel hydrothermic method. TiO2/Nd is then coated on rice husk ash to produce modified TiO2/Nd/rice husk ash material using Nd content of 0.36% w/w. The materials’ structure characteristic and photocatalytic properties have been analyzed by the XRD, EDX, TEM, SEM, forbidden zone energy (Eg) and specific surface area (BET). TiO2/Nd material shows a higher photocatalytic decomposition capacity in comparison to TiO2 and depended on the Nd content. The Rifampicin removal efficiency of TiO2/Nd materials with Nd contents ranged from 0.36 to 0.80% had an increase of about 40% higher than that of TiO2/Nd containing Nd from 0.01 to 0.28%. This new photocatalytic TiO2/Nd/rice husk ash material is used to decompose Rifampicin. Within 90 minutes under sunlight, the Rifampicin decomposed efficiency of TiO2/Nd and TiO2/Nd/rice husk ash material reached about 86 and 75%, respectively. Even lower efficiency was obtained, the latter material was chosen for Rifampicin residue decomposition in the water under sunlight through photocatalytic process because it has some advantages such as smaller amount was needed and easily to be recovered. Rifampicin removal process, k values were found matching more to zero and first order kinetics. Especially, for powder TiO2/Nd and TiO2/Nd/Rice husk ash under solar irradiation the R2 reached about 0.98.

scholarly journals Synthesizing and Evaluating the Photocatalytic and Antibacterial Ability of TiO2/SiO2 Nanocomposite for Silicate Coating

2021 ◽  
Vol 9 ◽  
Author(s):  
Manh-Cuong Le ◽  
Thu-Huong Le ◽  
Thanh-Huyen Bui Thi ◽  
Quang-Dat Nguyen ◽  
Thanh-Ha Do Thi ◽  
...  
Keyword(s):  
Phase Transition ◽  
Surface Area ◽  
Anatase Phase ◽  
Sol Gel ◽  
Photocatalytic Reaction ◽  
Photocatalytic Efficiency ◽  
Silicate Coating ◽  
Gel Method ◽  
Sol Gel Method ◽  
Antibacterial Ability

The TiO2/SiO2 nanocomposite has been synthesized by a sol-gel method and investigated the effect of the SiO2 content (0, 5, 10, 15, 20, and 50%) on the rutile-to-anatase phase transition of TiO2 NPs. In order to increase the photocatalytic efficiency of the nanocomposite and decrease the price of material, the TiO2/SiO2 Nc with content SiO2 of 15% sample is chosen for preparing silicate coating. The efficiency of photocatalytic MB and antibacterial ability in the air of W silicate coating (adding TiO2/SiO2 Nc (15%)) achieve almost 100% for 60 h and 94.35% for 3 h, respectively. While the efficiency of photocatalytic MB and antibacterial ability of WO silicate coating (adding commercial TiO2/SiO2) is about 25–30% for 60 h and 6.02% for 3 h, respectively. The presence of TiO2/SiO2 Nc (15%) with a larger surface area in W silicate coating can provide increased centers for absorption, photocatalytic reaction, and the contact between sample and bacteria lead to enhance the photocatalytic and antibacterial ability of W silicate coating.

Calcination Temperature Influence on the Microstructure and the Photocatalytic Properties of TiO2 Pillared Rectorite

2011 ◽  
Vol 197-198 ◽  
pp. 790-795
Author(s):  
Zong Wu Wei ◽  
Jian Hua Chen ◽  
Mei Qun Lin ◽  
Ye Chen
Keyword(s):  
Photocatalytic Activity ◽  
Calcination Temperature ◽  
Sol Gel ◽  
Photocatalytic Reaction ◽  
Photocatalytic Efficiency ◽  
Temperature Influence ◽  
High Adsorption ◽  
Bet Analysis ◽  
High Adsorption Capacity ◽  
Xrd Patterns

TiO2 pillared rectorite (TPLR) had been synthesized by sol-gel method, and was characterized by XRD, TEM, BET, UV-vis DRS and FTIR. The effects of calcination temperature on the microstructure and the photocatalytic activity of the as prepared catalyst were investigated. The photocatalytic activity of the catalyst was evaluated by decomposition of Acid Red B (ARB) aqueous solution. XRD patterns revealed that TiO2 is incorporated into the interlayer of the rectorite. TEM demonstrated that TiO2 particles are present in the rectorite. The BET analysis indicated that the surface area of the sample calcined at 300°C (TPLR-300) was larger than those of other samples. The TPLR samples had high adsorption capacity and good photocatalytic efficiency in decomposition of ARB in water. FTIR spectra of the original and the recovered samples indicated that the catalyst had not chemically changed during the photocatalytic reaction.

scholarly journals Photocatalytic Decomposition of N2O by Using Nanostructured Graphitic Carbon Nitride/Zinc Oxide Photocatalysts Immobilized on Foam

Catalysts ◽  
2019 ◽  
Vol 9 (9) ◽  
pp. 735 ◽  
Author(s):  
Kamila Kočí ◽  
Martin Reli ◽  
Ivana Troppová ◽  
Marcel Šihor ◽  
Tereza Bajcarová ◽  
...  
Keyword(s):  
Carbon Nitride ◽  
Cost Effective ◽  
Band Gap Energy ◽  
Photocatalytic Decomposition ◽  
Photocatalytic Reaction ◽  
Photocatalytic Efficiency ◽  
Ultraviolet A ◽  
Electron Hole ◽  
Gap Energy ◽  
Significant Factors

The aim of this work was to deposit cost-effective g-C3N4/ZnO nanocomposite photocatalysts (weight ratios of g-C3N4:ZnO from 0.05:1 to 3:1) as well as pure ZnO and g-C3N4 on Al2O3 foam and to study their photocatalytic efficiency for the photocatalytic decomposition of N2O, which was studied in a home-made batch photoreactor under ultraviolet A irradiation (λ = 365 nm). Based on the photocatalysis measurements, it was found that photocatalytic decomposition of N2O in the presence of all the prepared samples was significantly higher in comparison with photolysis. The photoactivity of the investigated nanocomposite photocatalysts increased in the following order: g-C3N4/ZnO (3:1) ≈ g-C3N4/ZnO (0.45:1) ≤ g-C3N4/ZnO (2:1) ZnO < g-C3N4 < g-C3N4/ZnO (0.05:1). The g-C3N4/ZnO (0.05:1) nanocomposite showed the best photocatalytic behavior and the most effective separation of photoinduced electron–hole pairs from all nanocomposites. The key roles played in photocatalytic activity were the electron–hole separation and the position and potential of the valence and conduction band. On the other hand, the specific surface area and band gap energy were not the significant factors in N2O photocatalytic decomposition. Immobilization of the photocatalyst on the foam permits facile manipulation after photocatalytic reaction and their repeated application.

scholarly journals Formation and Photocatalytic Activity of BaTiO3Nanocubes via Hydrothermal Process

2015 ◽  
Vol 2015 ◽  
pp. 1-6 ◽  
Author(s):  
Xinrun Xiong ◽  
Ruoming Tian ◽  
Xi Lin ◽  
Dewei Chu ◽  
Sean Li
Keyword(s):  
Methylene Blue ◽  
Particle Size ◽  
Photocatalytic Activity ◽  
Reaction Time ◽  
Hydrothermal Process ◽  
Photocatalytic Decomposition ◽  
Photocatalytic Reaction ◽  
Photocatalytic Efficiency ◽  
Methylene Orange ◽  
Hydrothermal Approach

We reported a facile hydrothermal approach to synthesize BaTiO3nanocubes with controlled sizes for degradation of methylene blue (MB). The nanocubes with reaction time of 48 hours exhibited the highest photocatalytic efficiency, owing to their narrower size distribution and better crystallinity compared to those of 24 hours and, at the meantime, smaller particle size than those of 72 hours. This work also demonstrated the degradation of methylene orange (MO) using BaTiO3nanocubes synthesized for 48 hours. Compared with the removal of MB, BaTiO3had lower photocatalytic activity on MO, mainly due to the poorer absorption behavior of MO on the surface of BaTiO3nanocubes. The degradation efficiency for each photocatalytic reaction was calculated. The possible mechanism of the photocatalytic decomposition on MB has been addressed as well.

Preparation, Characterization of Fe3O4/TiO2/CuO Nanohybrid and its Potential Performance for Chromium Removal from Aqueous Solution

2015 ◽  
Vol 827 ◽  
pp. 49-55 ◽  
Author(s):  
Sarah A. Arifin ◽  
Shofianina Jalaludin ◽  
Rosari Saleh
Keyword(s):  
Aqueous Solution ◽  
Hexavalent Chromium ◽  
Photocatalytic Performance ◽  
Sol Gel ◽  
Visible Region ◽  
Chromium Removal ◽  
Photocatalytic Efficiency ◽  
Complicated Process ◽  
Nanohybrid Materials

Fe3O4/TiO2and Fe3O4/CuO nanohybrid nanohybrid materials have attracted widespread attention due to their scientific and technological importance as photocatalyst. Complicated process is usually used to synthesize these nanohybrid. In this study, we demonstrated a simple low-temperature sol-gel method to prepare Fe3O4/TiO2/CuO nanohybrid as photocatalyst. Hexavalent chromium was used as a model pollutant to evaluate their photocatalytic activity. The results of the photoreduction of hexavalent chromium in aqueous solution indicated that with the incorporation of CuO content in Fe3O4/TiO2nanohybrid increasing the photocatalytic performance in ultraviolet and visible region. Moreover, it is found that hydroxyl radical has an important role in photocatalytic efficiency.

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