scholarly journals Electro-photocatalytic degradation of amoxicillin using calcium titanate

2018 ◽  
Vol 16 (1) ◽  
pp. 949-955 ◽  
Author(s):  
Lvshan Zhou ◽  
Xiaogang Guo ◽  
Chuan Lai ◽  
Wei Wang
Keyword(s):  
Photocatalytic Degradation ◽  
Reaction Rate ◽  
Irradiation Time ◽  
Oxygen Demand ◽  
Reaction Rate Constant ◽  
Calcium Titanate ◽  
Experimental Conditions ◽  
Exponential Factor ◽  
First Order ◽  
First Order Kinetics

AbstractThe electro-photocatalytic degradation of amoxicillin in aqueous solution was investigated using single factor test by the potassium permanganate method for measuring the values of chemical oxygen demand (CODMn). Batch experiments were carried out successfully under different conditions, including initial amoxicillin concentration, calcium titanate dosage, pH, UV irradiation time, electrolyte and temperature. The experimental results show that there is a great difference between electro-photocatalytic and photocatalitic degradation. The maximum electro-photocatalytic degradation efficiency can increase to 79% under the experimental conditions of 200 mL amoxicillin solution (100 mg L-1) with 0.5 g calcium titanate by pH=3 for 120 min irradiation and 0.058 g sodium chloride as electrolyte at 318.5K. In addition, the reaction rate constant of 0.00848~0.01349 min-1, activation energy of 9.8934 kJ mol-1 and the pre-exponential factor of 0.5728 were obtained based on kinetics studies, indicating that the electro-photocatalytic reaction approximately followed the first-order kinetics model.

scholarly journals Immobilized rGO/TiO2 Photocatalyst for Decontamination of Water

Catalysts ◽  
2019 ◽  
Vol 9 (9) ◽  
pp. 708 ◽  
Author(s):  
Radek Zouzelka ◽  
Monika Remzova ◽  
Jan Plsek ◽  
Libor Brabec ◽  
Jiri Rathousky
Keyword(s):  
Photocatalytic Degradation ◽  
Reaction Rate ◽  
Reaction Rate Constant ◽  
Tio2 Photocatalyst ◽  
Limited Effect ◽  
Environmental Application ◽  
First Order ◽  
Beneficial Effects ◽  
Low Concentrations ◽  
Reduced Graphene

The preparation of immobilized graphene-based photocatalyst layers is highly desired for environmental applications. In this study, the preparation of an immobilized reduced graphene oxide (rGO)/TiO2 composite by electrophoretic deposition (EPD) was optimized. It enabled quantitative deposition without sintering and without the use of any dispersive additive. The presence of rGO had beneficial effects on the photocatalytic degradation of 4-chlorophenol in an aqueous solution. A marked increase in the photocatalytic degradation rate was observed, even at very low concentrations of rGO. Compared with the TiO2 and GO/TiO2 reference layers, use of the rGO/TiO2 composite (0.5 wt% of rGO) increased the first-order reaction rate constant by about 70%. This enhanced performance was due to the increased formation of hydroxyl radicals that attacked the 4-chlorophenol molecules. The direct charge transfer mechanism had only limited effect on the degradation. Thus, EPD-prepared rGO/TiO2 layers appear to be suitable for environmental application.

Solid Super Acid of S2O82- /FexOy-CuOx Catalytic Degradation of Orange IV

2011 ◽  
Vol 239-242 ◽  
pp. 182-185 ◽  
Author(s):  
Ying Jie Zhang ◽  
Guo Rui Liu ◽  
Da Peng Li ◽  
Yue Xiao Tian ◽  
Li Zhang ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Reaction Rate ◽  
Reaction Rate Constant ◽  
Heterogeneous Fenton ◽  
First Order ◽  
First Order Kinetics ◽  
Initial Ph ◽  
Good Catalytic Activity ◽  
Super Acid ◽  
Pseudo First Order

Solid super acid (S2O82-/FexOy-CuOx) was prepared and used as a heterogeneous Fenton-like catalyst to decompose H2O2for the degradation of refractory dye Orange IV in water. The factors that affected the degradation of Orange IV were discussed in this heterogeneous Fenton-like system. The catalytic activity of S2O82-/FexOy-CuOxwas evaluated by the degradation of Orange IV and the decomposition of H2O2. The results show that the catalyst S2O82-/FexOy-CuOxhas a good catalytic activity. The reaction follows pseudo-first-order kinetics; the reaction rate constant has a good relationship with the concentration of H2O2. The degradation rate of Orange IV and the decomposition rate of H2O2increase with the increase of temperature and the dosage of catalyst whereas it decreases with the increase of the initial concentration of Orange IV and the initial pH.

scholarly journals Photocatalytic Degradation of Bismarck Brown G Using Irradiated ZnO in Aqueous Solutions

2010 ◽  
Vol 7 (2) ◽  
pp. 540-544 ◽  
Author(s):  
Falah H. Hussein ◽  
Ahmed F. Halbus ◽  
Hussein A. K. Hassan ◽  
Wisam A. K. Hussein
Keyword(s):  
Zinc Oxide ◽  
Aqueous Solutions ◽  
Photocatalytic Degradation ◽  
Irradiation Time ◽  
Degradation Process ◽  
First Order ◽  
Photocatalytic Decolorization ◽  
First Order Kinetics ◽  
Decolorization Efficiency ◽  
Increasing Temperature

In this study, a homemade photoreactor equipped with 125w/542 high pressure mercury lamp as a source for near-UV radiation, was used for photocatalytic degradation of aqueous solutions of Bismarck brown G, (C18H20N8Cl2),4-[5-(2,4-Diamino-5-methylphenyl)diazenyl-2-methylphenyl] diazenyl -6-methylbenzol-1,3-diamin using zinc oxide. The disappearance of the original colored reactant concentrations with irradiation time was monitored spectrophotometrically by comparison with unexposed controls. It is noticed that the photocatalytic degradation process was high at the beginning and then decreased with time following pseudo first-order kinetics according to the Langmuir–Hinshelwood model. The effects of zinc oxide mass, dye concentration and temperature on photocatalytic decolorization efficiency (P.D.E.) were studied. P.D.E. reached 95.76% for Bismarck brown G after 50 minutes of irradiation at 293.15 K P.D.E. was found to increase with increasing temperature and the activation energy of photocatalytic degradation was calculated and found to be equal to 32±1 kJ mol-1.

scholarly journals Immobilized rGO/TiO2 Photocatalyst for Decontamination of Water

2019 ◽  
Author(s):  
Radek Zouzelka ◽  
Monika Remzova ◽  
Jan Plsek ◽  
Libor Brabec ◽  
Jiri Rathousky
Keyword(s):  
Photocatalytic Degradation ◽  
Reaction Rate ◽  
Reaction Rate Constant ◽  
Order Reaction ◽  
Limited Effect ◽  
Environmental Application ◽  
First Order ◽  
Beneficial Effects ◽  
Low Concentrations ◽  
Reduced Graphene

The preparation of immobilized graphene–based photocatalyst layers is highly desired for environmental applications. In this study, the preparation of an immobilized reduced graphene oxide (rGO)/TiO2 composite by electrophoretic deposition (EPD) was optimized. It enabled quantitative deposition without sintering and without the use of any dispersive additive. The presence of rGO had beneficial effects on the photocatalytic degradation of 4-chlorophenol in an aqueous solution. A marked increase in the photocatalytic degradation rate was observed, even at very low concentrations of rGO. Compared with the TiO2 and GO/TiO2 reference layers, use of the rGO/TiO2 composite (0.5 wt% of rGO) increased the first-order reaction rate constant by about 70%. This enhanced performance was due to the increased formation of hydroxyl radicals that attacked the 4-chlorophenol molecules. The direct charge transfer mechanism had only limited effect on the degradation. Thus, EPD-prepared rGO/TiO2 layers appear to be suitable for environmental application.

Study on the Kinetics of Immersion of Photocatalyst in Bamboo

2012 ◽  
Vol 271-272 ◽  
pp. 218-221
Author(s):  
Xu Zhang ◽  
Zhong Feng Zhang ◽  
Kai Huang
Keyword(s):  
Reaction Rate ◽  
Reaction Order ◽  
Reaction Rate Constant ◽  
Exponential Factor ◽  
First Order ◽  
Higher Temperature ◽  
Three Stages ◽  
Increasing Temperature ◽  
Kinetics Of ◽  
Stable Stage

In order to improve the anti-mildew property of modified bamboo with photocatalyst, it used TiO2 which is one of the typical photocatalyst as the main study object to discussed the kinetics of immersion of photocatalyst in bamboo. The results show that immersion of TiO2 in bamboo can be divided into three stages, starting with the rapid immersion, the slow immersion in the middle stage, and the stable immersion in the later stage. In the stable stage, only little TiO2 immerse bamboo. The immersion rate is faster at higher temperature to take less time to reach equilibrium. By establishing the kinetic models, the reaction of immersion of photocatalyst can be regarded as the first order reaction with reaction order of 0.97, the reaction rate constant increases with increasing temperature, the activation energy is 5663.133J/mol, and the pre-exponential factor is 20.47h-1.

scholarly journals Photocatalytic Degradation of a Systemic Herbicide: Picloram from Aqueous Solution Using Titanium Oxide (TiO2) under Sunlight

2020 ◽  
Vol 4 (4) ◽  
pp. 58
Author(s):  
Md. Rakibul Islam ◽  
Jahida Binte Islam ◽  
Mai Furukawa ◽  
Ikki Tateishi ◽  
Hideyuki Katsumata ◽  
...  
Keyword(s):  
Photocatalytic Degradation ◽  
Titanium Oxide ◽  
Irradiation Time ◽  
Degradation Mechanism ◽  
Chloride Ion ◽  
Reaction Rate Constant ◽  
Ammonium Ion ◽  
Light Reaction ◽  
First Order Kinetics ◽  
Initial Ph

The photocatalytic degradation of picloram (4-amino-3,5,6-trichloro-2-pyridincarboxylic acid), which is one of popular acidic herbicide, was investigated with the existence of titanium oxide (TiO2) under sunlight. The total photocatalytic degradation of 20 ppm of picloram was occurred within 30 min irradiation with TiO2, while a negligible degradation was found without TiO2 under sunlight. The influence of various parameters, like TiO2 dosage, solution initial pH, intensity of light, reaction temperature and irradiation time, was found during the photocatalytic degradation of picloram. The mineralization of picloram was proved by the deterioration of total organic carbon (TOC) of the photocatalytic process. The pseudo–first order kinetics of photocatalytic degradation was obtained according to the Langmuir–Hinshelwood model, and the reaction rate constant was 17.6 × 10−2 min−1. Chloride ion, ammonium ion, nitrate ion and CO2 were erected as the final products after completing the photocatalytic degradation of picloram. The intermediate products could not be determined by the GC–MS during the degradation of picloram. Therefore, the degradation mechanism of the picloram was proposed based on the frontier electron density and the point charge at each atom of the picloram molecule. The photocatalytic degradation method, using sunlight, may develop into as a pragmatic technique to purify picloram contaminated wastewater.

scholarly journals Photocatalytic Degradation of Erythrosin-B using Cadmium Cobaltite for Water Reuse: Efficiency and Degradation Pathway

2020 ◽  
Vol 32 (9) ◽  
pp. 2143-2148
Author(s):  
JAYANTI SAMOTA ◽  
SURAJ SHARMA ◽  
SHIPRA BHARDWAJ ◽  
KUMUD INTODIA
Keyword(s):  
Photocatalytic Degradation ◽  
Water Reuse ◽  
Reaction Rate ◽  
Degradation Pathway ◽  
Photochemical Degradation ◽  
Erythrosin B ◽  
First Order ◽  
First Order Kinetics ◽  
Pseudo First Order ◽  
The Impact

In present work, a photocatalytic degradation of Erythrosin-B has been studied using cadmium cobaltite. The impact of different parameters such as pH, amount of cadmium cobaltite, concentration of Erythrosin-B and light intensity have been observed on the reaction rate. Radical quenching experiments revealed that hydroxyl radicals are primarily responsible for the degradation of Erythrosin-B. The progress of reaction monitored spectrophotometrically and it followed pseudo first-order kinetics. An experimental mechanism is proposed for the photochemical degradation of Erythrosin-B.

A Comparative Study on Photocatalytic Degradation of Pyridinium – Based Ionic Liquid by TiO2 and ZnO in Aqueous Solution

2019 ◽  
Vol 17 (9) ◽  
Author(s):  
Oualida Nour El Houda Kaabeche ◽  
Razika Zouaghi ◽  
Soraya Boukhedoua ◽  
Seyfeddine Bendjabeur ◽  
Tahar Sehili
Keyword(s):  
Aqueous Solution ◽  
Ionic Liquid ◽  
Photocatalytic Degradation ◽  
Alkaline Medium ◽  
Kinetics Study ◽  
No Adsorption ◽  
Experimental Conditions ◽  
First Order ◽  
First Order Kinetics ◽  
Carbonate Ions

Abstract The photocatalytic degradation of hexylpyridinium bromide (HPyBr) from an aqueous solution was studied by focusing on comparison of the photoactivity of ZnO and TiO2 P25. The process was carried out under different experimental conditions. The results showed that there is no adsorption of pollutant by both catalysts in the dark. The efficiency of P25 Degussa and ZnO photocatalysts were compared, and the photocatalytic kinetics study showed that ZnO is more efficient than TiO2 P25. The HPyBr photodegradation was found to follow a pseudo-first order kinetics, and the higher rates constants were obtained at the alkaline medium for ZnO (pH = 11, kapp = 9.61 × 10–2 min−1) and at acidic medium for TiO2 P25 (pH = 3, kapp = 1.28 × 10–2 min−1). The Langmuir–Hinshelwood model was found suitable to explain the rate constant data for the ionic liquid degradation by both catalysts. The presence of carbonate ions at alkaline medium was found to reduce the HPyBr degradation for ZnO and to enhance the HPyBr degradation for TiO2, this enhancement in TiO2/CO32-/UV system was confirmed by the addition of •OH and hvb+ scavengers. According to TOC and COD results, HPyBr mineralization was faster in ZnO/UV system than in TiO2/UV system.

scholarly journals Enhanced Photocatalytic Degradation and Mineralization of Furfural Using UVC/TiO2/GAC Composite in Aqueous Solution

2016 ◽  
Vol 2016 ◽  
pp. 1-10 ◽  
Author(s):  
Bahram Ghasemi ◽  
Bagher Anvaripour ◽  
Sahand Jorfi ◽  
Neematollah Jaafarzadeh
Keyword(s):  
Photocatalytic Degradation ◽  
Removal Efficiency ◽  
Irradiation Time ◽  
Titanium Dioxide Nanoparticles ◽  
Sol Gel ◽  
Total Pore Volume ◽  
Operational Parameters ◽  
Experimental Conditions ◽  
First Order Kinetics ◽  
Initial Ph

Titanium dioxide nanoparticles were immobilized on granular activated carbon (GAC) as a porous and low-density support for photocatalytic degradation of furfural. The TiO2/GAC composite was synthetized using the simple sol-gel method and fully characterized. The effects of the operational parameters of furfural concentration (200–700 mg/L), initial pH (2–12), TiO2/GAC composite dosage (1–3.5 g/L), and irradiation time (20–120 min) were studied. The synthetized TiO2/GAC composite exhibited a total pore volume of 0.13 cm3/g and specific surface area of 35.91 m2/g. Removal efficiency of up to 95% was observed at initial pH of 10, TiO2/GAC dosage of 2.5 g/L, irradiation time of 80 min, and initial furfural concentration of 500 mg/L. The photocatalyst could be reused at least four consecutive times with a mere 2% decrease in furfural removal efficiency. Mineralization efficiency of 94% was obtained within 80 min. Pseudo-first-order kinetics best fit the photocatalytic degradation of furfural under experimental conditions.

scholarly journals Photocatalytic degradation of caffeine in a slurry reactor with intermittent UV irradiation: optimization and response surface modelling

2021 ◽  
Author(s):  
C. Nirmala Rani
Keyword(s):  
Photocatalytic Degradation ◽  
Response Surface ◽  
Oxygen Demand ◽  
Surface Modelling ◽  
Initial Concentration ◽  
Design Expert ◽  
First Order ◽  
First Order Kinetics ◽  
Response Surface Modelling ◽  
Catalyst Dosage

Abstract This study focusses on the photocatalytic degradation of caffeine (CAF) a stimulating drug and environmental contaminant that pose threat to humans and the environment. The effect of operating parameters such as; CAF initial concentration (5–20 mg/L), catalyst dosage (0.1–0.9 g/L) and pH (3.0–9.0) were explored in detail. The experimental results showed the maximum CAF and chemical oxygen demand (COD) removals of 87.2% and 66.7% respectively. The optimized parameters were; CAF initial concentration – 5 mg/L, catalyst dosage – 0.5 g/L and pH – 7.2. The photocatalytic degradation of CAF followed pseudo-first order kinetics. The obtained experimental data were analysed with response surface methodology (RSM) using Design Expert Software.

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