bluuebunny/crossref_metadata_2025_split huggingface dataset:
Oxidation of Pesticides in Water by Fenton and Photo-Fenton Reactions
Authors: Kassinos Despo , Constantinou Maria , Varnava Nektaria , Papadopoulos Achilleas , Vlachos Savvas , Mantzavinos Dionissios 
Published: November 2016

AbstractThe degradation of four pesticides, namely atrazine (ATZ), fenitrothion (FNT), 4-chloro-2-methylphenoxyacetic acid (MCPA) and 4-chlorophenoxyacetic acid (CPA) by Fenton and UVA-induced photo-Fenton reactions was investigated. Experiments were conducted at pH 3-3.5 and various Fe(II) and H
Photoelectrocatalytic Activity of Electrosynthesised Tungsten Trioxide- Titanium Dioxide Bi-Layer Coatings for the Photooxidation of Organics
Authors: Georgieva J. , Armyanov S. , Valova E. , Philippidis N. , Poulios I. , Sotiropoulos S. 
Published: November 2016

AbstractBi-layer WO
Effect of Contaminant Hydrophobicity in the Treatment of Contaminated Soils by Catalyzed H2O2 Propagations (Modified Fenton’s Reagent)
Authors: Watts Richard J. , Haeri-McCarroll Tanya M. , Teel Amy L. 
Published: November 2016

AbstractThe effect of contaminant hydrophobicity on hydrogen peroxide dosage requirements in the treatment of contaminated soils using catalyzed H
Photocatalytic Destruction of Geosmin Using Novel Pelleted Titanium Dioxide
Authors: Bellu Edmund , Lawton Linda A. , Robertson Peter K. J. 
Published: November 2016

AbstractGeosmin is produced by cyanobacteria and actinomycetes in surface waters. It causes undesirable earthy off-flavours in freshwater fish and is a major concern for the drinking water industry. This paper presents the first published study on the use of the novel pelleted TiO
Effect of Ozone Oxidation on the Molecular and Kinetic Properties of Effluent Organic Matter
Authors: Rosario-Ortiz Fernando L. , Mezyk Stephen P. , Wert Eric C. , Doud Devin F. R. , Singh Manu K. , Xin Mei , Baik Seungyun , Snyder Shane A. 
Published: November 2016

AbstractThe effect of ozone oxidation on the second order reaction rate constant between effluent organic matter (EfOM) and hydroxyl radical (
Treatment of Antibiotic Formulation Wastewaters by Fenton Process
Authors: Tünay Olcay , Samuk Beyza , Ölmez Tugba , Kabdaşlı Işık 
Published: November 2016

AbstractPharmaceuticals formulation plants have a variety of wastewater sources. A significant part of these wastewaters can be directly conducted to central biological treatment. Among the wastewater groups that need a pretreatment, antibiotic wastewaters require a special attention due to their toxicity to biological treatment and low biodegradability. In this study, pretreatment of antibiotic formulation wastewaters by Fenton oxidation process was experimentally investigated. Three different antibiotic formulations, all having common use, were selected. The basic formulation of the antibiotics used were; cefuroxime axetil, ceftriaxone and sulfisoxazole. Strength of all three samples was similar and around 1000 mg/L COD. Fenton oxidation proved very effective on all samples. Optimum conditions of oxidation were found as; pH 2, Fe
Homogeneous and Heterogeneous Catalytic Ozonation of Pulp Bleaching Effluent
Authors: Balcıoğlu Işıl Akmehmet , Moral Çiğdem Kıvılcımdan 
Published: November 2016

AbstractCatalytic ozonation is a promising treatment method for both water and wastewater. In this study, in order to increase the biodegradability of bleaching wastewater from an integrated pulp- and -paper production plant, granulated activated carbon-(GAC), iron-(Fe
A Novel Adsorption/Saturation Approach to Ultrasonic Degradation of Phenol
Authors: Kidak Rana , Ince Nilsun H. 
Published: November 2016

AbstractThe study describes development and application of a kinetic model based on the local concentration of solutes and hydroxyl radicals to predict the rate of ultrasonically induced oxidative degradation of phenol at 300 kHz. The results reveal that the degradation follows saturation kinetics. The rate is slow at low concentrations of the solute, increases with concentration and reaches a maximum at what we defined as “the critical concentration”. At higher concentrations (than the “critical”) the rate slows down and stabilizes at a plateau as it becomes concentration-independent. Owing to the similarity of sonochemical reactions in water to chemical reactions in heterogeneous systems, a kinetic model based on Langmuir adsorption isotherm is developed to predict the rate of reaction in terms of the initial concentration of the solute. The similarity of the model to models describing catalytic and adsorptive reaction kinetics is explained by reduced mass transfer limitations under ultrasonic irradiation, and localization of the solute at the bubble-liquid interface as a function of concentration.
Oxidative Pretreatment of Fresh and Mature Landfill Leachate
Authors: Gotvajn A. Žgajnar , Zagorc-Končan J. , Derco J. , Almasiova B. , Kassai A. 
Published: November 2016

AbstractThe aim of our research was to evaluate treatment efficiency of Fenton’s process and ozonation for the treatment of two landfill leachates (fresh and mature), both resulting from municipal waste disposal. Both samples had high organic load (COD of the fresh and mature landfill leachate were 2700 and 490 mg·L
Degradation of 4-n-nonylphenol in Water by 20 kHz Ultrasound
Authors: Gultekin Isil , Tezcanli-Guyer Gökce , Ince Nilsun H. 
Published: November 2016

AbstractSonochemical degradation of 4-n-Nonylphenol (NP) by 20 kHz ultrasound was investigated at varying substrate concentrations, sparge gases and pH. It was found that increases in the initial concentration of NP led to slower rate of degradation, due to increasing fraction of the solutes at the interfacial area at higher concentrations. The impact of pH was such that the rate of degradation was maximum at pH=10.8, minimum at pH=3.0 and in between the two extremes at pH=6.0. Extreme rapidness of the reaction at alkaline conditions was related to the pKa of NP (10.7) and the facilitation of the covalent bond cleavage between the phenolic and alkyl groups. The fact that the reaction was faster at acidic pH than at pH 6 was attributed to the protonation of the molecule that supported its migration towards the negatively charged gas bubbles. The rate of reaction was also accelerated by bubbling oxygen gas and by the addition of Fenton and Fenton-like reagents (Fe
Integration of Photocatalysis with Ultrafiltration or Membrane Distillation for Removal of Azo Dye Direct Green 99 from Water
Authors: Mozia Sylwia , Morawski Antoni W. 
Published: November 2016

AbstractAn application of hybrid processes photocatalysis - ultrafiltration (UF) and photocatalysis - direct contact membrane distillation (DCMD, MD) for removal of azo-dye Direct Green 99 from water is presented. Titanium dioxide Aeroxide® P25 (Degussa, Germany) was used as a photocatalyst. It was found that both membrane processes were effective in separation of TiO
Binder Effect on Photocatalytic Performance of TiO2 Solution Coating Layers
Authors: Nakamura Kohzo , Yamaoka Takashi , Nagatsuka Tatsuki , Taga Yasunori 
Published: November 2016

AbstractIn fabrication process of photocatalysts, solution coating process has been expected to become a promising technique because of practical advantages of productivity. This process is, however, far from practical use for the reason of tecchnical problems. One of the most difficult problems is to immobilize the photocatalysts powder because final photocatalytic performance of coating layer was strongly affected by the immobilization process. In order to investigate the immobilization process, TiO
Rhodamine B Discolouration on TiO2 in the Cement Environment: A Look at Fundamental Aspects of the Self-cleaning Effect in Concretes
Authors: Folli A. , Jakobsen U. H. , Guerrini G. L. , Macphee D. E. 
Published: November 2016

AbstractThe present work addresses the photocatalytic properties of two commercial titanias for application in concrete technology. A microsized, m-TiO
Liquid Phase Epoxidation of Allylic Compounds with Hydrogen Peroxide at Autogenic and Atmospheric Pressure over Mesoporous Ti- MCM-48 Catalyst
Authors: Wróblewska Agnieszka , Milchert Eugeniusz 
Published: November 2016

AbstractThe epoxidation of allylic compounds: allyl alcohol, methallyl alcohol and methallyl chloride to corresponding epoxides: glycidol, 2-methylglycidol and 2-methylepichlorohydrin with hydrogen peroxide over Ti-MCM-48 catalyst has been studied. The epoxidation was carried out with 30 wt% hydrogen peroxide in methanol as a solvent under autogenic pressure (in autoclave) and at atmospheric pressure in a glass reactor. The optimal technological parameters and regions of advantageous changes of: temperature, the molar ratio allylic compound/H
Degradation of Bisphenol-A by Ozonation
Authors: Gultekin Isil , Mavrov Valko , Ince Nilsun H. 
Published: November 2016

AbstractThe study reports the degradation of an endocrine disrupting compound- bisphenol A (BPA) by ozonation at slightly acidic pH with emphasis on the operational parameters (e.g. BPA concentration, ozone addition and mass transfer rate, contact time), reaction kinetics, rate constants and oxidation byproducts. It was found that the rate of BPA decay (pseudo-first order with respect to concentration) was accelerated with increased ozone addition rate and decreased BPA initial concentration. The profile of aqueous ozone concentration was such that it remained constant during 1-3 min of contact and increased thereafter. The bimolecular reaction rate constant was estimated using the steady state concentration of ozone and the value found was in good agreement with those reported in the literature for similar pH. Total mineralization was most rapid before complete conversion of BPA and much slower thereafter, implying low reactivity of the intermediate products with ozone. Mineralization was enhanced by alkalinization to pH 10.8, which facilitated the overall degradation process via the formation of radical species that were less selective than ozone. Byproducts of oxidation in successive order of formation were p-tert-butylphenol, hydroquinone, methyl-dihydrobenzofuran and n-butyl acetate, none of which are classified as endocrine disruptors.
Electrical Discharge Characteristics Using a Bubble in Water and Their Applications to the Water Treatment
Authors: Yamabe Chobei , Ihara Satoshi 
Published: November 2016

AbstractThe discharge in the single bubble that was introduced or fixed between the main electrodes was carried out and the electrical discharge characteristics in water were measured. The time-integrated photographs confirmed both the discharge along the bubble surface and the direct penetration in a bubble. The onset breakdown voltage increased gradually with the conductivity of treated water in range of 1.0 ~ 22.0 [ μ S/cm]. The onset breakdown voltage also increased with the steepness of the applied voltage dv/dt.
Development of Higher Yield Ozonizer Based on Nano-Seconds Pulsed Discharge
Authors: Wang Douyan , Matsumoto Takao , Namihira Takao , Akiyama Hidenori 
Published: November 2016

AbstractEnergy efficient generation of ozone is very important because ozone is being used increasingly in a wide range of industrial applications. In this study, ultra-short duration pulsed streamer discharges with a duration of 5 ns hava been used to produce ozone in a wire-to-cylinder electrode reactor. The triaxial Blumlein configuration is used for the nano-seconds pulsed generator. Ozone concentration and ozone production yield were measured at various applied voltages (50 to 70 kV), and pulse repetitions (10 to 60 pps) at atomospheric pressure in oxygen and air. The experimental results showed that the ozone concentration (g/m
Ozone Mass Transfer in a Recirculating Loop Semibatch Reactor Operated at High Pressure
Authors: Moslemi Mohammadreza , Davies Simon H. , Masten Susan J. 
Published: November 2016

AbstractThe effects of water flow rate, mixing, gaseous ozone concentration, inlet gas flow rate, temperature, and pH on ozone hydrodynamics at high pressure were studied. Varying the cross flow rate had only a slight influence on the ozone mass transfer rates, indicating that sufficient mixing in the reactor was attained at the low flow rates used. The addition of an inline static mixer had a negligible effect on aqueous ozone concentrations in the reactor, suggesting that mixing was sufficient without the mixer. The ozone mass transfer increased with increasing gaseous ozone concentration and with the inlet gas flow rate. The dissolved ozone concentration decreased with increasing pH due to the greater rate of ozone decomposition at higher pH. Increasing the temperature resulted in a decrease in the ozone mass transfer. A model to describe the ozone mass transfer was developed. Good agreement between the model predictions and the experimental data was achieved.
Photocatalytic Oxidation of Four Model Mercaptans from Aquatic Environment Using Ag-ZnO Nanocomposite Thin Film for Odor Control
Authors: Habibi Mohammad Hossein , Sheibani Reza 
Published: November 2016

AbstractIn this study, Ag-ZnO nanocomposite thin film catalysts coated on glass prepared by a simple spin-coating method were used to mineralize four model mercaptans, 2-Mercaptobenzoxazole (MBO), 2-Mercaptobenzimidazole (MBI), 3-Mercapto-1,2,4-triazole (MT) and 2-Mercaptopyrimidine (MP) for odor control. Ag-ZnO nanocomposite thin film was characterized by means of X-ray diffraction (XRD), scanning electron microscopy/energy dispersive X-ray spectrometry (SEM/EDX). It was found that these mercaptans underwent photocatalytic degradation in the presence of Ag-ZnO nano-composite thin film, and the optimum catalyst was Ag-ZnO with 0.064 molar percent of Ag. The rate of photocatalytic process carried out with Ag-ZnO thin film as well as the relationship between the operational parameters. This fundamental research about the photocatalytic reaction provides essential knowledge with potential to further develop a new process for mercaptan degradation in odor control.
What Are Titania Photocatalysts?―An Exploratory Correlation of Photocatalytic Activity with Structural and Physical Properties
Authors: Ohtani Bunsho , Mahaney Orlando Omar Prieto , Amano Fumiaki , Murakami Naoya , Abe Ryu 
Published: November 2016

AbstractThis article reports on an exploratory statistical analysis of the photocatalytic activity of titanium(IV) oxide (TiO
Binary Cationic BDDAC/Anionic DoS Surfactant Systems of Variable Compositions.Mineralization by an Advanced Oxidation Process in Aqueous Dispersions
Authors: Hidaka Hisao , Tamano Tatsuya , Fujimoto Takashi , Machinami Tomoya , Oyama Toshiyuki , Horiuchi Teruo , Serpone Nick 
Published: November 2016

AbstractThe TiO
Effect of Post-annealing on the Photocatalytic Activity of Hydrothermally Synthesised Titania Nanotubes
Authors: Wadhwa Shikha , Hamilton Jeremy W. J. , Dunlop Patrick S.M. , Dickinson Calum , Byrne John A. 
Published: November 2016

AbstractHeterogeneous photocatalysis has been reported to be effective for the degradation of a wide range of organic pollutants and the inactivation of pathogens in water. The use of nanostructured materials is one approach to improving photocatalytic efficiency. Titanate nanotubes were prepared by a hydrothermal synthesis and annealing yielded titania nanotubes, nanorods and crystals. These materials were characterized using XRD, XPS, BET and TEM. The photocatalytic activities were studied using phenol and formic acid as model pollutants. The as-prepared titanate nanotubes had a very high specific surface area (401 m
Natural Zeolite Reactivity Towards Ozone: The Role of Acid Surface Sites
Authors: Alejandro Serguei , Valdés Héctor , Zaror Claudio. A. 
Published: November 2016

AbstractGround-level ozone is an air pollutant which interferes with plant photosynthesis, stunts overall growth of some plant species, and harms animal respiratory systems. Activated carbon, synthetic zeolites, metal oxides and noble metals have been used as catalysts to destroy ozone. However, the high costs of these materials impair their application at full-scale. Low cost natural zeolites could be an interesting option for ozone elimination. In this work, the influence of Chilean natural zeolite chemical surface properties on gaseous ozone removal was evaluated. Chemical modifications of Chilean natural zeolite showed the role of acid surface sites and the Si/Al ratio on gaseous ozone abatement. Samples were characterised by nitrogen adsorption at 77 K, elemental analyses, X-ray fluorescence (XRF), temperature-programmed desorption (TPD), and hygroscopic analyses. The influence of air humidity on gaseous ozone removal using natural and modified zeolite samples was also evaluated. The results showed that lower Si/Al ratio corresponds to a higher density of Lewis acid sites. It was found that increasing the zeolite surface area does not improve gaseous ozone removal. The conversion of Brønsted acid sites into Lewis acid sites at 823 K led to an increase on ozone removal.
The Effect of Operational Parameters on the Photocatalytic Degradation of C.I. Reactive Yellow 86 Textile Dye Using Manganese Zinc Oxide Nanocomposite Thin Films
Authors: Habibi Mohammad Hossein , Askari Elham 
Published: November 2016

AbstractManganese zinc oxide semiconductor thin films have been deposited by sol-gel process on glass substrate which was characterized by means of X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX) and UV-Vis spectroscopy (UV-Vis). The as deposited thin films on glass are monophasic with good crystallinity and hexagonal wurtzite structure. In order to increase the photocatalytic efficiency of the zinc oxide coatings the authors optimized the sol-gel process and doped the coatings with manganese. By slightly doping the zinc oxide films with 2 at% manganese the photocatalytic performance is increased compared to pure zinc oxide semiconductor thin films. The photocatalytic performance of the manganese zinc oxide films was evaluated by the decomposition of a textile dye (C.I. Reactive Yellow 86) (RY86) with UV light irradiation. This investigation will give a new insight to understanding the industrial textile dye photodegradation in aquatic environment.
Degradation of Ivermectin by Fenton and Photo-Fenton and Toxicity Test Using Daphnia similis
Authors: Dal Bosco Sandra M. , Barbosa Izabela M. , Candello Fernando P. , Maniero Milena G. , Rath Susanne , Guimarães José R. 
Published: November 2016

AbstractThis work evaluated the degradation of ivermectin, a veterinary drug widely used in the treatment of ectoparasites and endoparasites, and the removal of acute toxicity (using Daphnia similis) by Fenton (Fe
Application of Fenton´s Reagent for Acrylic Dyeing Wastewater Decolorization, Organic Matter Reduction and Biodegradability Improvement
Authors: Rodrigues Carmen S. D. , Boaventura Rui A. R. , Madeira Luis M. 
Published: November 2016

AbstractFenton's reagent oxidation was employed for organic matter and color removal, along with biodegradability improvement, of a synthetic acrylic dyeing wastewater, previously treated by coagulation/flocculation. The initial iron load in the Fenton’s stage varied from the residual soluble iron concentration resulting from the coagulation/ flocculation process (which was 275 mg Fe/L) up to 400 mg/L, by adding increasing amounts of ferrous sulfate. The combination of the two treatments led to overall removals of 99.8, 84.2 and 78.6% for color, dissolved organic carbon (DOC) and chemical oxygen demand (COD), respectively, complying with maximum allowable discharge values. The Fenton process was also directly applied to the effluent. Under the optimum conditions, the color removal (99.5%) was similar to that obtained in the combined process, but DOC and COD removals were lower (66.5 and 65.1%, respectively). An improvement of the wastewater biodegradability was observed in such condition: the specific oxygen uptake rate and BOD:COD ratio increased from < 0.2 to 17.9 mgO
Assessing the Effect of Inorganic Anions on TiO2-Photocatalysis and Ozone Oxidation Treatment Efficiencies
Authors: Barndõk Helen , Hermosilla Daphne , Cortijo Luis , Negro Carlos , Blanco Ángeles 
Published: November 2016

AbstractConsidering the application of AOPs might be limited for the treatment of industrial wastewater with high inorganic load, and that partial results reported to date regarding this particular are inconclusive, even opposite in some cases, the effect of inorganic anions on the oxidation efficiency of photocatalysis and ozonation has been further assessed with statistical significance. While the presence of sulphate and chloride did not appreciably affect the photocatalytic oxidation of phenol, nitrate significantly enhanced the removal of COD (≈ 8-15%). The addition of carbonate simply increased the pH, which strongly inhibited the photocatalytic process; whereas if pH=5 was kept constant, the reduction of the COD was not affected by the presence of carbonate. On the other hand, sulphate, chloride and nitrate did not significantly affect the degradation of phenol by ozonation; whereas the presence of carbonate apparently enhanced the reduction of COD. It is actually proved that this improvement in the efficiency of the treatment was produced by the pH buffering effect of these ions, rather than to its presence itself, which actually significantly reduced the removal of COD (5-10%) by radical scavenging action in comparison to when the treatment was performed in the absence of anions in the solution adjusting the pH to similar basic values (≈9.5-13.5). When ozonation was performed at a pH close to neutral (6.5 ± 0.2) or basic (12 ± 0.2), at which the indirect oxidation of hydroxyl radical is surely widely active, the results were significantly enhanced in any case (COD removal ≈ 70-75%), whether in the absence or the presence of these anions; despite the significant slight radical scavenging effect (COD removal ≈ 65-70%) that was attributed to the addition of carbonate.
Photocatalytic Decolorization of Methyl Orange in Bi2O3 Suspension System
Authors: Zhong Jun Bo , He Xi Yang , Li Jian Zhang , Zeng Jun , Lu Yan , Hu Wei 
Published: November 2016

AbstractThe present work aims to investigate the apparent kinetic model, effect of the pH value and the possible mechanism. The paper reveals that Methyl Orange (MO) can be decolorized effectively in β-Bi
Water Remediation Using Pulsed Power Discharge under Water with an Advanced Oxidation Process
Authors: Takahashi Katsuyuki , Takaki Koichi , Satta Naoya 
Published: November 2016

AbstractIn the present study, the degradation of organic contaminants by streamer discharge using a pulsed power generator under water is investigated. The experiments are conducted based on the decolorization of two dyes, Acid Red 1 and Acid Blue 74, and the decomposition of 1,4-dioxane. A gas-liquid separated reactor is developed and employed to achieve degradation with high energy efficiency. A tungsten wire electrode is placed in the gas phase, and a grounded 316 stainless steel wire is immersed in the water. The pulsed high voltage is generated by a magnetic pulse compression circuit and is applied to the wire electrode to generate streamer discharges in the gas region, which propagate into the bubble injected into the water. Oxygen and argon gases are injected to identify the dominant reactions of the degradation of organic contaminants. Acid Red 1 and Acid Blue 74 solutions are successfully decolorized by the discharges. The ozone produced by discharges in the gas region primarily decolorizes the dye solutions. The total organic carbon (TOC) of the 1,4-dioxane solution decreases due to discharge when argon is injected. The decrement rate of TOC does not increase through gaseous ozone injection or by discharges in the case of oxygen injection. These results show that the chemical species produced by discharges and by chemical reactions in the solution, such as hydroxyl and hydroperoxyl radicals, primarily decompose 1,4-dioxane. Iron ions dissolved by electrolysis enhanced the TOC decrement rate according to the Fenton reaction in acidic conditions.