Highly photocatalytic activity of pH-controlled ZnO nanoflakes
Thi Thuy DaoThi Le Na VoAnh Tuan DuongDang Thanh TranNguyễn Đình LâmPham Van VinhRaja DasHữu Tuấn Nguyễn
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Rhodamine B
Methyl orange
Photodegradation
Congo red
Methylene blue
Degradation
The kinetics of photodegradation of methylene blue over UV light illuminated titania particles in aqueous suspensions has been studied with different initial methylene blue concentrations and TiO2 particle sizes. The degradation rate increases with the decrease of initial concentration and particle size. A quasi-experienced model for photodegradation rate is derived based mainly on the coinstantaneous effects of different initial concentrations and particle sizes. The mathematical relationships of model parameters with initial concentration and particle size are given. The model results of the photodegradation rate of methylene blue are coincident with the experimental data.
Photodegradation
Methylene blue
Degradation
Particle (ecology)
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The study of photodegradation of Congo Red using UV light, with addition ZnO catalyst, H 2 O 2 and Fe 2+ has been carried out. This study included the determination of optimum amount of ZnO, H 2 O 2 , Fe 2+ , pH optimum and the determination of system which shows the most effective in Congo Red photodegradation. The results showed that the optimum conditions to degradate 100 ppm of Congo Red solution were 60 mg of ZnO, 4 ml of H 2 O 2 (0,0392 mol), 20 mg FeSO 4 (0,0013 mol) and pH 5. The highest percentage of degradation was 93,6093 + 0,12 % reached using UV/ZnO/H 2 O 2 / Fe 2+ system at 5 hour photodegradation time. In this processes addition of ZnO, H 2 O 2 , and FeSO 4 , and pH were important parameters to increase the percentage of photodegradation.
Congo red
Photodegradation
Degradation
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Congo red
Methylene blue
Cationic polymerization
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Abstract The current study was done in order to find the efficiency of (spent tea leaves, orange peels, pomegranate peels) as adsorbents to remove industrial dyes; Congo red and methylene blue dyes. the results show that the three proposed adsorbents have a low to moderate ability to remove the dyes. The results show that depleted the tea leaves have a higher ability than orange peels and the pomegranate peels being the lowest in removing the methylene blue dye, while for the Congo red dye removal the orange peels were the highest followed by pomegranate peels and the lowest was the depleted tea leaves.
Congo red
Methylene blue
Methyl orange
Methyl red
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Kinetics of Photocatalytic Degradation of Methylene Blue over TiO_2 Particles in Aqueous Suspensions
The kinetics of photodegradation of methylene blue over UV light illuminated titania particles in aqueous suspensions has been studied with different initial methylene blue concentrations and TiO2 particle sizes. The degradation rate increases with the decrease of initial concentration and particle size. A quasi-experienced model for photodegradation rate is derived based mainly on the coinstantaneous effects of different initial concentrations and particle sizes. The mathematical relationships of model parameters with initial concentration and particle size are given. The model results of the photodegradation rate of methylene blue are coincident with the experimental data.
Photodegradation
Methylene blue
Degradation
Particle (ecology)
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ZnO nanocomposites co-doped with dopants like Mg with Ti or Al were prepared and assigned as ZnO-A and ZnO-B. All the nanocomposites were characterized by XRD, SEM and EDX and its utility towards the photodegradation of Congo red is studied. The present study was carried out in 30 W mercury lamp fitted in batch photoreactor and the effect of decomposition was measured in UV-absorption. Nanocomposite with combination of Ti dopant (ZnO-A) exhibited effective degrading ability to aqueous Congo red solution. A solution of 100 ppm of above concentrated ZnO nanocomposite solution was reduced nearly to 5ppm within 5 h. The photodegradation kinetics revealed that the photodegradation of aqueous Congo red follows first order reaction and showed quite comparable degradation effeciency with earlier reports.
Photodegradation
Congo red
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In order to carry out the study,the experiments of photodegradation of methylene blue under different conditions were conducted,using different kinds of free radical scavengers, such as(CH_3)_3OH,H_2O_2,KI,NaN_3 and C_6H_4O_2.The effects of these free radical scavengers were observed.The concentration of H_2O_2 generated during the photodegradation of methylene blue by TiO_2 was also reported.And the results of these experiments indicated that the main active oxygen substances in the reaction are·OH,O_2~- and ~1 O_2.
Photodegradation
Methylene blue
Methylene
Degradation
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Abstract Recently, the research on development of visible-light-active photocatalysts for photodegradation of organic pollutants has got much attention. Therefore, this study reports the synthesis of Co 3 O 4 -Bi 2 O 3 heterojunction as visible-light responsive photocatalyst for photodegradation of rhodamine B dye. The Co 3 O 4 -Bi 2 O 3 heterojunction was synthesized by coprecipitation method and characterized by XRD, EDS, SEM, TGA and FTIR. The as prepared Co 3 O 4 -Bi 2 O 3 heterojunction was utilized as photocatalyst for photodegradation of rhodamine B dye using a 100 mg/L solution. It was observed that Co 3 O 4 -Bi 2 O 3 showed best catalytic performance with ~ 92% degradation of rhodamine B dye than Co 3 O 4 and Bi 2 O 3 with 14 and 34% removal of rhodamine B dye, respectively. The rate constant for Co 3 O 4 -Bi 2 O 3 catalyzed photodegradation of rhodamine B was 6 times and 3 times higher than rate constant for Co 3 O 4 catalyzed and Bi 2 O 3 catalyzed photodegradation of rhodamine B, respectively. The pH 8 was found as optimum pH for Co 3 O 4 -Bi 2 O 3 catalyzed photodegradation of rhodamine B dye.
Photodegradation
Rhodamine B
Rhodamine
Visible spectrum
Coprecipitation
Degradation
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The photocatalytic activity of titania nanotubes and nanoparticles toward methylene blue (MB) can be enhanced through addition of a small amount of Ce. MB acts as a hole scavenger, fastening the photocatalytic process.
Photodegradation
Methylene blue
Scavenger
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