Kinetic evaluation of ZnO/TiO2 thin film photocatalyst in photocatalytic degradation of Orange G

Background: Improper storage and raw materials make peanut oil susceptible to Aflatoxin B1 (AFB1). The semiconductor TiO2 photocatalysis technology is an effective technology which is widely used in sewage treatment, environmental protection and so on. Moreover, the photocatalytic efficiency can be improved by doping I. Method: The experiment is divided into two parts. In the first part, supported TiO2 thin film (STF) was prepared on the quartz glass tube (QGT) by the sol-gel and calcination method and the supported iodine doped supported TiO2 thin film (I-STF) was synthesized using potassium iodate solution. In the second part, the photocatalytic degradation of AFB1 was performed in a self-made photocatalytic reactor. The AFB1 was detected by ELISA kit. Results: The photocatalytic degradation of AFB1 has been proven to follow pseudo first-order reaction kinetics well (R2 > 0.95). The maximum degradation rate of 81.96%, which was reached at the optimum iodine concentration of 0.1mol/L, was 11.38% higher than that with undoped STF. The doping of iodine reduces the band-gap of TiO2, thereby increasing the photocatalytic response range. The proportion of Ti4+ in I-STF has decreased, which means that Ti4+ are replaced by I. The I-STF prepared at iodine concentration of 0.1mol/L has good photocatalytic properties.

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An efficient TiO2 thin-film photocatalyst: photocatalytic properties in gas-phase acetaldehyde degradation

Journal of Photochemistry and Photobiology A Chemistry ◽

10.1016/1010-6030(96)04328-6 ◽

1996 ◽

Vol 98 (1-2) ◽

pp. 79-86 ◽

Cited By ~ 314

Author(s):

Iis Sopyan ◽

Mitsuru Watanabe ◽

Sadao Murasawa ◽

Kazuhito Hashimoto ◽

Akira Fujishima

Keyword(s):

Thin Film ◽

Gas Phase ◽

Tio2 Thin Film ◽

Photocatalytic Properties ◽

Acetaldehyde Degradation ◽

Tio2 Thin Film Photocatalyst

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Study on the Thermal Treatment of Nano-Ag/TiO2 Thin Film

ISRN Nanotechnology ◽

10.5402/2011/614243 ◽

2011 ◽

Vol 2011 ◽

pp. 1-5

Author(s):

Peng Bing ◽

Wang Jia ◽

Chai Li-yuan ◽

Wang Yun-yan ◽

Mao Ai-li

Keyword(s):

Thin Film ◽

Methyl Orange ◽

Thermal Treatment ◽

Photocatalytic Degradation ◽

Tio2 Thin Film ◽

Heating Temperature ◽

Antibacterial Properties ◽

Heating Time ◽

Degradation Rates ◽

Temperature Heating

The photocatalytic degradation rates of methyl orange and antibacterial properties of nano-Ag/TiO2 thin film on ceramics were investigated in this study. XRD was used to detect the structure of film to clarify the impacts on the rates and properties. The effect of film layers, heating temperature, heating time, and embedding of Ag+ on the degradation rates and antibacterial properties were ascertained. The nano-Ag/TiO2 film of 3 layers with AgNO3 3% embedded and treated at 350°C for 2 h would exhibit good performance.

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Photocatalytic Degradation of Different VOCs in the Gas-Phase over TiO2 Thin Films Prepared by Ultrasonic Spray Pyrolysis

Catalysts ◽

10.3390/catal9110915 ◽

2019 ◽

Vol 9 (11) ◽

pp. 915 ◽

Cited By ~ 4

Author(s):

Ibrahim Dundar ◽

Marina Krichevskaya ◽

Atanas Katerski ◽

Malle Krunks ◽

Ilona Oja Acik

Keyword(s):

Thin Film ◽

Thin Films ◽

Photocatalytic Degradation ◽

Spray Pyrolysis ◽

Tio2 Thin Film ◽

Ultrasonic Spray Pyrolysis ◽

Airflow Rate ◽

Tio2 Films ◽

Tio2 Thin Films ◽

Ultrasonic Spray

In this study, we deposited TiO2 thin films onto borosilicate glass by ultrasonic spray pyrolysis at 350 and 450 °C. The aim of study is to determine the effect of deposition temperature on photocatalytic activity of TiO2 thin films and to investigate the performance of TiO2 thin films on photocatalytic degradation of methyl tert-butyl ether (MTBE), acetone, acetaldehyde, and heptane as functions of different operating parameters. TiO2 thin films deposited at 350 and 450 °C have a thickness value of 190 and 330 nm, respectively. All as-prepared TiO2 films possess an anatase crystalline structure. According to the X-ray photon spectroscopy (XPS) study, the TiO2 thin film deposited at 350 °C showed a higher amount of oxygen vacancies and hydroxyl groups on the film surface after UV treatment. The aged-TiO2 thin film deposited at 350 °C showed a water contact angle (WCA) value of 0° after 10 min UV irradiation, showing superhydrophilic surface behavior. The TiO2 film deposited at 350 °C exhibited the highest amount of conversion of MTBE (100%). The results also showed that TiO2 films are capable of photocatalytic degradation of MTBE (100%) and acetaldehyde (approx. 80%) in humid air conditions and high airflow rate. The visible-light-activity of TiO2 thin films was tested with 5 ppm MTBE and acetone. TiO2 thin films deposited at 350 °C with a surface area of 600 cm2 showed 60% of MTBE and 33% of acetone degradation under VIS light.

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Photocatalytic degradation kinetics of Orange G dye over ZnO and Ag/ZnO thin film catalysts

Scientific Reports ◽

10.1038/s41598-019-54142-w ◽

2019 ◽

Vol 9 (1) ◽

Cited By ~ 5

Author(s):

Derya Tekin ◽

Taner Tekin ◽

Hakan Kiziltas

Keyword(s):

Thin Film ◽

Kinetic Model ◽

Photocatalytic Degradation ◽

Degradation Kinetics ◽

Reaction Medium ◽

Rate Equations ◽

Zno Thin Film ◽

Model Studies ◽

Thin Film Catalysts ◽

Orange G

AbstractThe degradation of water pollutants with photocatalysts is one of the most studied subjects in the past 20 years. Although considerable studies have been completed in this field, kinetic model studies are still a major inadequacy. In this study, ZnO and Ag/ZnO thin film photocatalysts were synthesized and SEM-EDS, XRD and chronoamperometric measurements were used the characterization of photocatalysts. The network kinetic model was applied the photocatalytic degradation of Orange G using ZnO and Ag/ZnO thin film photocatalysts. The photocatalytic degradation of Orange G was investigated under the different reaction medium (initial dye concentrations, temperature, light intensity). It was found that the network kinetic model is the most appropriate model for the degradation of Orange G dye on the ZnO and Ag/ZnO thin film photocatalysts. The calculated adsorption equilibrium (KB) constant and activation energy of ZnO thin film photocatalyst are 0.0191 and 21.76 kj/mol, respectively. Additionally, the calculated values for Ag/ZnO thin film photocatalyst are 0.035 and 18.32 kj/mol. The general rate equations were determined for each photocatalysts.

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