Photocatalytic degradation of clofibric acid, carbamazepine and iomeprol using conglomerated TiO2 and activated carbon in aqueous suspension

2010 ◽  
Vol 61 (1) ◽  
pp. 273-281 ◽  
Author(s):  
Markus Ziegmann ◽  
Fritz H. Frimmel
Keyword(s):  
Activated Carbon ◽  
Photocatalytic Degradation ◽  
Synergistic Effects ◽  
Aqueous Suspension ◽  
Clofibric Acid ◽  
Tio2 Surface ◽  
Pharmaceutically Active Compounds ◽  
First Order ◽  
First Order Kinetics ◽  
Adsorption Affinity

The combination of powdered activated carbon (PAC) and TiO2 has been tested for synergistic/antagonistic effects in the photocatalytic degradation of carbamazepine, clofibric acid and iomeprol. Synergistic effects are thought to be caused by rapid adsorption on the PAC surface followed by diffusion to the TiO2 surface and photocatalytic degradation. The Freundlich constant KF was used for comparing the sorption properties of the three substances and it was found that KF for clofibric acid was 3 times lower than for carbamazepine and iomeprol, regardless of the kind of PAC used. A PAC with a distinct tendency to form conglomerates was selected so that a high percentage of the PAC surface was in direct proximity to the TiO2 surface. The photocatalytic degradation of the pharmaceutically active compounds studied followed pseudo-first order kinetics. Synergistic effects only occurred for clofibric acid (factor 1.5) and an inverse relationship between adsorption affinity and synergistic effects was found. High affinity of the target substances to the PAC surface seemed to be counterproductive for the photocatalytic degradation.

Photocatalytic Degradation of Acrylic Acid, Acrolein and Hydroquinone Using TiO2 under Simulated Solar Irradiation

2013 ◽  
Vol 781-784 ◽  
pp. 2129-2132 ◽  
Author(s):  
Yan Wen Gong ◽  
Xue Ni Cheng ◽  
Hong Xun Zhang
Keyword(s):  
Acrylic Acid ◽  
Photocatalytic Degradation ◽  
Nitrogen Doping ◽  
Solar Irradiation ◽  
First Order ◽  
First Order Kinetics ◽  
Pseudo First Order ◽  
Simulated Solar Irradiation

Nitrogen doping TiO2was prepared and used to degrade acrolein wastewater under simulated solar irradiation acrylic acid. The results showed that the removal of acrolein, hydroquinone and acrylic acid were 0.73, 0.64, 0.26 after 4 hour degradation by TiO2/UV system. The degradation of acrolein, hydroquinone and acrylic acid using TiO2/UV system followed pseudo first-order kinetics. It results indicated that this proposed method can be useful for the pretreatment acrolein wastewater.

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.

Photodegradation of organic matter in fresh garbage leachate using immobilized nano-sized TiO2 as catalysts

2013 ◽  
Vol 69 (6) ◽  
pp. 1219-1226
Author(s):  
C. Chen ◽  
Q. Xie ◽  
B. Q. Hu ◽  
X. L. Zhao
Keyword(s):  
Organic Matter ◽  
Activated Carbon ◽  
Degradation Rate ◽  
Sol Gel ◽  
Oxygen Demand ◽  
Solution Ph ◽  
First Order ◽  
First Order Kinetics ◽  
Catalyst Dosage ◽  
H2o2 Addition

Two immobilized nano-sized TiO2 catalysts, TiO2/activated carbon (TiO2/AC) and TiO2/silica gel (SG) (TiO2/SG), were prepared by the sol–gel method, and their use in the photocatalytic degradation of organic matter in fresh garbage leachate under UV irradiation was investigated. The influences of the catalyst dosage, the initial solution pH, H2O2 addition and the reuse of the catalysts were evaluated. The degradation of organic matter was assessed based on the decrease of the chemical oxygen demand (COD) in the leachate. The results indicated that the degradation of the COD obeyed first-order kinetics in the presence of both photocatalysts. The degradation rate of COD was found to increase with increasing catalyst dosage up to 9 g/L for TiO2/AC and 6 g/L for TiO2/SG, above which the degradation began to attenuate. Furthermore, the degradation rate first increased and then decreased as the solution pH increased from 2 to 14, and the degradation rate increased as the amount of H2O2 increased to 2.93 mM, after which it remained constant. No obvious decrease in the rate of COD degradation was observed during the first four repeated uses of the photocatalysts, indicating that the catalysts could be recovered and reused. Compared with TiO2/AC, TiO2/SG exhibited higher efficiency in photocatalyzing the degradation of COD in garbage leachate.

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.

Treatment of Simulated Wastewater Containing Chlorobenzene by Iron-Carbon Micro-Electrolysis Packing

2010 ◽  
Vol 113-116 ◽  
pp. 176-180 ◽  
Author(s):  
Meng Li ◽  
Dong Lei Zou ◽  
Hao Chen Zou ◽  
Dong Yan Fan
Keyword(s):  
Activated Carbon ◽  
Ph Value ◽  
Raw Materials ◽  
Removal Rate ◽  
Reaction Rates ◽  
First Order ◽  
First Order Kinetics ◽  
Low Degree ◽  
Simulated Wastewater ◽  
Pseudo First Order

Using iron filings, activated carbon power and clay as raw materials, the granular iron-carbon micro-electrolysis packing was made by the method of calcination. The influence of initial chlorobenzene (CB) concentration, pH value and reaction temperature on the removal rate of simulated wastewater containing CB were investigated. The results showed that the reaction followed the pseudo-first-order kinetics model and the rate constants varied at a relatively low degree at various pH. Temperature is an important parameter and an increase in temperature could significantly raise the reaction rates. The column packed with packing was designed to remove CB in wastewater. After running for 70 days, the packing still had good performance and there was no obvious decrease on the removal rate.

scholarly journals Photocatalytic degradation of Reactive Red 24 in Aqueous Media by Photo-Fenton Reagent

2016 ◽  
Vol 11 (7) ◽  
pp. 3751-3758
Author(s):  
Dr. Bhupendra Kumar Sharma ◽  
Anil Kumar Swarnkar
Keyword(s):  
Photocatalytic Degradation ◽  
Textile Industry ◽  
Advanced Oxidation Processes ◽  
Municipal Wastewater ◽  
Aqueous Media ◽  
Dilute Solution ◽  
Fenton Reagent ◽  
Oxidation Processes ◽  
First Order ◽  
First Order Kinetics

Advanced oxidation processes (AOPs) are widely used for the removal of health hazardous organic pollutants from industrial and municipal wastewater. Reactive Red 24, which has a complex molecular structure with azo aromatic groups, is widely used in textile industry. Degradation of Reactive Red 24 by Photo-Fenton regent has been investigated under irradiation of visible light in aqueous solution. The parameters that influence degradation such as concentration of Reactive Red 24, FeSO4, H2O2, light intensity and pH of the experimental solution were studied. The optimum condition for the photocatalytic degradation of dye was established. The degradation of dye in the dilute solution follows the first order kinetics.

scholarly journals Photocatalytic removal of cefazolin from aqueous solution by AC prepared from mango seed+ZnO under UV irradiation

2018 ◽  
Vol 20 (2) ◽  
pp. 399-407 ◽  
Keyword(s):  
Activated Carbon ◽  
Kinetic Model ◽  
Uv Irradiation ◽  
Advanced Oxidation ◽  
Beam Radiation ◽  
Initial Concentration ◽  
First Order ◽  
First Order Kinetics ◽  
Pseudo First Order ◽  
Mango Seed

Presence of antibiotics in the environment specially in aqueous environments is considered a major warning about health and environment. Thus, this study aims the efficiency of coupled process of Activated Carbon (AC) prepared from mango seed+ZnO under UV irradiation as an advanced oxidation process in removing cefazolin antibiotic from aqueous solutions. This experimental study was carried out in a discontinuous reaction chamber with volume of one liter. In this process, the effect of initial pH parameters of the environment (3– 9), initial concentration of cefazolin (20 – 200 mg/L), concentration of modified, photocatalyzer (20 – 100 mg/L) and reaction time (10 – 60 min) were studied. The pilot used consisted of a low pressure mercury lamp with a 55-watt beam radiation power inside the steel chamber. The kinetic of the process was studied based on pseudo first order kinetics. Results showed that the highest removal efficiency of cefazolin antibiotics in the reaction of UV/AC + ZnO, at optimal conditions of pH= 3, contact time of 60 min, initial concentration of 100 mg/L and modified photocatalyzer of 0.1 g/L was equal to 96%. The kinetic model determined for the process followed kinetic model of pseudo- first order kinetics with high correlation of (R2 = 0.99). Results of present study revealed that photocatalyzer process of nanoparticles oxidation on synthetic activated carbon can be effectively used as an advanced oxidation reaction to remove cefazolin and similar pollutants.

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.

Photocatalytic Degradation of 4-Chlorophenol with a Novel α-Ga2O3

2011 ◽  
Vol 356-360 ◽  
pp. 1319-1322
Author(s):  
Bao Xiu Zhao ◽  
Li Na Zheng ◽  
Yuan Wei ◽  
Fan Yang
Keyword(s):  
Aqueous Solution ◽  
Photocatalytic Degradation ◽  
Degradation Kinetics ◽  
Endocrine Disrupting Chemicals ◽  
Life Time ◽  
First Order ◽  
First Order Kinetics ◽  
Endocrine Disrupting ◽  
The Common ◽  
Main Factors

Chlorophenols is a kind of environmental endocrine disrupting chemicals (EDCs) and it is hard for the common methods to degrade or remove them, so how to decompose these pollutants has attracted researches’ attention. In this paper, a novel α-Ga2O3was used to degrade 4-chlorophenol via photocatalytic reaction and degradation kinetics was investigated. The effects of main factors, such as dosage of α-Ga2O3and pH of aqueous solution, on degradation were studied, and degradation kinetics was also established. Experimental results displayed that the optimal pH of aqueous solution was about 7.8 and almost 98% 4-chlorophenol was decomposed after 2 h, when the dosage of α-Ga2O3was 0.4 g and the initial concentration of 4-chlorophenol was 20 mg/L (V=200 ml). Photocatalytic degradation of 4-chlorophenol with α-Ga2O3abided by first-order kinetics and half-life time was 20.4 min.

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