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https://www.readbyqxmd.com/read/28097924/enhancing-the-performance-of-electro-peroxone-by-incorporation-of-uv-irradiation-and-bdd-anodes
#1
Nasr Bensalah, Ahmed Bedoui
In this work, the treatment of 4-nitrophenol (NP) in water by ozonation, electrolysis, electro-peroxone (EP), and photo-electro-peroxone (PEP) processes was investigated. PEP process is based on the combination of ozonation, UV irradiation, and electrolysis using carbon felt cathode and Boron Doped Diamond (BDD) anode. In this process, H2O2 is electrochemically generated from reduction of O2 in the ozone generator effluent at a carbon felt cathode. The insitu generated H2O2 is simultaneously decomposed by UV- photolysis and by reaction with O3 to form HO(-) radicals that can rapidly and non-selectively oxidize organic pollutants...
January 18, 2017: Environmental Technology
https://www.readbyqxmd.com/read/28097518/beneficial-effects-of-ozone-therapy-on-oxidative-stress-cardiac-functions-and-clinical-findings-in-patients-with-heart-failure-reduced-ejection-fraction
#2
Mutlu Buyuklu, Fatih Mehmet Kandemir, Turan Set, Eftal Murat Bakırcı, Husnu Degirmenci, Hikmet Hamur, Ergun Topal, Sefa Kucukler, Kultigin Turkmen
The aim of study was to determine the effects of ozone therapy on the oxidative stress, cardiac functions and clinical findings in patients with heart failure reduced ejection fraction (HFrEF). A total of 40 patients with New York Heart Association 2 and 3 HF with left ventricular ejection fraction (LVEF) <35%, and 40 subjects without HF as control group were included in the study. Patients with HFrEF were given additional ozone therapy of major and minor administrations along with conventional HF treatment for 5 weeks...
January 17, 2017: Cardiovascular Toxicology
https://www.readbyqxmd.com/read/28097285/localization-in-an-idealized-heterogeneous-elastic-sheet
#3
Bekele J Gurmessa, Andrew B Croll
Localized deformation is ubiquitous in many natural and engineering materials as they approach failure, and a significant effort has been made to understand localization processes with simple continuum models. Real materials are much more commonly heterogeneous but it is unclear exactly how heterogeneity affects outcomes. In this work we study the response of an idealized heterogenous elastic sheet on a soft foundation as it is uniaxially compressed. The patterned surface layers are created by selective ultraviolet/ozone treatment of the top surface of a polydimethylsiloxane (PDMS) sample using a TEM grid as a mask...
January 18, 2017: Soft Matter
https://www.readbyqxmd.com/read/28092936/the-effect-of-ozonation-and-biological-activated-carbon-treatment-of-wastewater-effluents-on-formation-of-n-nitrosamines-and-halogenated-disinfection-byproducts
#4
Yi-Hsueh Chuang, William A Mitch
Ozonation followed by biological activated carbon (O3/BAC) is being considered as a key component of reverse osmosis-free advanced treatment trains for potable wastewater reuse. Using a laboratory-scale O3/BAC system treating two nitrified wastewater effluents, this study characterized the effect of different ozone dosages (0-1.0 mg O3/mg dissolved organic carbon) and BAC empty bed contact times (EBCT; 15-60 minutes) on the formation after chlorination or chloramination of 35 regulated and unregulated halogenated disinfection byproducts (DBPs), 8 N-nitrosamines, and bromate...
January 17, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28089400/selective-sequential-separation-of-abs-hips-and-pvc-from-automobile-and-electronic-waste-shredder-residue-by-hybrid-nano-fe-ca-cao-assisted-ozonisation-process
#5
Srinivasa Reddy Mallampati, Byoung Ho Lee, Yoshiharu Mitoma, Cristian Simion
The separation of plastics containing brominated flame retardants (BFR) like (acrylonitrile-butadiene-styrene (ABS), high-impact polystyrene (HIPS), and polyvinyl chloride (PVC)) from automobile and electronic waste shredder residue (ASR/ESR) are a major concern for thermal recycling. In laboratory scale tests using a hybrid nano-Fe/Ca/CaO assisted ozonation treatment has been found to selectively hydrophilize the surface of ABS/HIPS and PVC plastics, enhancing ABS wettability and thereby promoting its separation from ASR/ESR by means of froth flotation...
January 12, 2017: Waste Management
https://www.readbyqxmd.com/read/28088026/current-ambient-concentrations-of-ozone-in-panama-modulate-the-leaf-chemistry-of-the-tropical-tree-ficus-insipida
#6
Gerald F Schneider, Alexander W Cheesman, Klaus Winter, Benjamin L Turner, Stephen Sitch, Thomas A Kursar
Tropospheric ozone (O3) is a major air pollutant and greenhouse gas, affecting carbon dynamics, ecological interactions, and agricultural productivity across continents and biomes. Elevated [O3] has been documented in tropical evergreen forests, the epicenters of terrestrial primary productivity and plant-consumer interactions. However, the effects of O3 on vegetation have not previously been studied in these forests. In this study, we quantified ambient O3 in a region shared by forests and urban/commercial zones in Panama and found levels two to three times greater than in remote tropical sites...
December 27, 2016: Chemosphere
https://www.readbyqxmd.com/read/28081506/investigation-of-ozone-and-peroxone-impacts-on-natural-organic-matter-character-and-biofiltration-performance-using-fluorescence-spectroscopy
#7
Nicolás M Peleato, Balsher Singh Sidhu, Raymond L Legge, Robert C Andrews
Impacts of ozonation alone as well as an advanced oxidation process of ozone plus hydrogen peroxide (H2O2 + O3) on organic matter prior to and following biofiltration were studied at pilot-scale. Three biofilters were operated in parallel to assess the effects of varying pre-treatment types and dosages. Conventionally treated water (coagulation/flocculation/sedimentation) was fed to one control biofilter, while the remaining two received water with varying applied doses of O3 or H2O2 + O3. Changes in organic matter were characterized using parallel factors analysis (PARAFAC) and fluorescence peak shifts...
December 27, 2016: Chemosphere
https://www.readbyqxmd.com/read/28074362/the-determination-and-fate-of-disinfection-by-products-from-ozonation-chlorination-of-fulvic-acid
#8
Xin Zhong, Chongwei Cui, Shuili Yu
Ozonation of fulvic acid (FA) can result in diverse intermediate oxidation by-products, significantly affecting disinfection by-product (DBP) formation following chlorination. The objective of this study was to provide insight into ozone reaction intermediates and reveal the possible formation pathway of DBPs from ozonation of FA due to the formation of intermediate oxidation by-products. Aldehydes, aromatic acids, short-chain acids, chloroform, and dichloroacetic acid were detected at various ozone dosage additions...
January 10, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28069236/recent-advancements-in-the-sonophotocatalysis-spc-and-doped-sonophotocatalysis-dspc-for-the-treatment-of-recalcitrant-hazardous-organic-water-pollutants
#9
REVIEW
Debabrata Panda, Sivakumar Manickam
: Sonophotocatalysis (SPC) is considered to be one of the important wastewater treatment techniques and hence attracted the attention of researchers to eliminate recalcitrant hazardous organic pollutants from aqueous phase. In general, SPC refers to the integrated use of ultrasonic sound waves, ultraviolet radiation and the addition of a semiconductor material which functions as a photocatalyst. Current research has brought numerous improvements in the SPC based treatment by opting visible light irradiation, nanocomposite catalysts and numerous catalyst supports for better stability and performance...
May 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28068535/comparison-of-micropollutants-removal-performance-between-pre-ozonation-and-post-ozonation-using-a-pilot-study
#10
Kai Yang, Jianwei Yu, Qingyuan Guo, Chunmiao Wang, Min Yang, Yu Zhang, Ping Xia, Dong Zhang, Zhiyong Yu
Despite the strong oxidizing ability of ozone, pre-ozonation has seldom been employed for the purpose of micropollutant removal in drinking water utilities. In this paper, the possibility of using pre-ozonation instead of post-ozonation for the removal of micropollutants was explored because of the lower risk of forming carcinogenic bromate. A 1.0 m(3)/h pilot system was utilized to compare the efficacy of pre- and post-ozonation in the removal of bulk organic pollutants as well as micropollutants, including typical odor-causing compounds, pharmaceuticals, and typical pesticides, from one source water (Huangpu River) characterized by the occurrence of various micropollutants...
December 27, 2016: Water Research
https://www.readbyqxmd.com/read/28068108/transferability-and-adhesion-of-sol-gel-derived-crystalline-tio2-thin-films-to-different-types-of-plastic-substrates
#11
Natsumi Amano, Mitsuru Takahashi, Hiroaki Uchiyama, Hiromitsu Kozuka
Anatase thin films were prepared on various plastic substrates by our recently developed sol-gel transfer technique. The plastic substrates employed were polycarbonate (PC), poly(methyl methacrylate) (PMMA), polyethylene terephthalate (PET), polyethylene (PE), polypropylene (PP), polyether ether ketone (PEEK), and polyvinylidene chloride (PVDC). An Si(100) substrate was first coated with a polyimide (PI)/polyvinylpyrrolidone (PVP) mixture layer, and an alkoxide-derived titania gel film was deposited on it by spin-coating...
January 9, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28067661/optimization-of-atmospheric-air-plasma-for-degradation-of-organic-dyes-in-wastewater
#12
Chaitanya Sarangapani, Y Dixit, Vladimir Milosavljevic, Paula Bourke, Carl Sullivan, P J Cullen
This study optimises the degradation of a cocktail of the dyes methyl orange and bromothymol blue by atmospheric air plasma. Response surface methodology (RSM) was employed to investigate the efficacy of the plasma process parameters on degradation efficiency. A Box-Behnken design (BBD) was employed to optimise the degradation of dyes by air plasma discharge. A second order polynomial equation was proposed to predict process efficiency. It was observed that the predicted values are significant (p < 0.001) with coefficients of determination 0...
January 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/28050974/modifying-optical-properties-of-reduced-graphene-oxide-with-controlled-ozone-and-thermal-treatment-in-aqueous-suspensions
#13
Md Tanvir Hasan, Brian J Senger, Price Mulford, Conor Ryan, Hung Doan, Zygmunt Gryczynski, Anton V Naumov
Graphene possesses a number of advantageous properties, however, does not exhibit optical emission, which limits its use in optoelectronics. Unlike graphene, its functional derivative, graphene oxide (GO) exhibits fluorescence emission throughout the visible. Here, we focus on controlled methods for tuning the optical properties of GO. We introduce ozone treatment of reduced graphene oxide (RGO) in order to controllably transform it from non-emissive graphene-like material into GO with a specific fluorescence emission response...
January 4, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28046113/effects-of-exposure-to-ozone-on-the-ocular-surface-in-an-experimental-model-of-allergic-conjunctivitis
#14
Hun Lee, Eung Kweon Kim, Hee Young Kim, Tae-Im Kim
Based on previous findings that ozone can induce an inflammatory response in the ocular surface of an animal model and in cultured human conjunctival epithelial cells, we investigated whether exposure to ozone exacerbates symptoms of allergic conjunctivitis. We evaluated the effects of exposure to ozone on conjunctival chemosis, conjunctival injection, corneal and conjunctival fluorescein staining scores, production of inflammatory cytokines in tears, and aqueous tear production in a mouse model of allergic conjunctivitis...
2017: PloS One
https://www.readbyqxmd.com/read/28038382/the-nlrp3-inflammasome-is-a-potential-target-of-ozone-therapy-aiming-to-ease-chronic-renal-inflammation-in-chronic-kidney-disease
#15
Gang Yu, Zhiming Bai, Zhiyuan Chen, Hui Chen, Guoren Wang, Gang Wang, Zhenxiang Liu
Ozone therapy is an effective medical treatment for various diseases. A previous study has demonstrated its reno-protective effect in chronic kidney disease (CKD), but the mechanism involved is not completely known. This study produced the 5/6 nephrectomized CKD rat model and investigated whether the reno-protective effect of ozone therapy was achieved by its anti-inflammatory property through the modulation of the NLRP3 inflammasome. The results showed that ozone therapy at a low concentration improved renal function and ameliorated renal morphological injury in 5/6 nephrectomized rats...
February 2017: International Immunopharmacology
https://www.readbyqxmd.com/read/28034429/promoting-catalytic-ozonation-of-phenol-over-graphene-through-nitrogenation-and-co3o4-compositing
#16
Qi Bao, Kwan San Hui, Jenq Gong Duh
Catalytic ozonation is progressively becoming an attractive technique for quick water purification but efficient and stable catalysts remains elusive. Here we solvothermally synthesized highly-dispersed Co3O4 nanocrystals over microscale nitrogen-doping graphene (NG) nanosheets and tested it as a synthetic catalyst in the ozonation of phenol in aqueous solutions. Transmission electron microscopy, powder X-ray diffraction, Fourier transform infrared spectra and X-ray photoelectron spectroscopy were used to determine its morphology, crystallinity, elemental composition and molecular bonds, respectively...
December 2016: Journal of Environmental Sciences (China)
https://www.readbyqxmd.com/read/28011354/ozone-regeneration-of-granular-activated-carbon-for-trihalomethane-control
#17
Xuexiang He, Mark Elkouz, Mandu Inyang, Eric Dickenson, Eric C Wert
Spatial and temporal variations of trihalomethanes (THMs) in distribution systems have challenged water treatment facilities to comply with disinfection byproduct rules. In this study, granular activated carbon (GAC) and modified GAC (i.e., Ag-GAC and TiO2-GAC) were used to treat chlorinated tap water containing CHCl3 (15-21μg/L), CHBrCl2 (13-16μg/L), CHBr2Cl (13-14μg/L), and CHBr3 (3μg/L). Following breakthrough of dissolved organic carbon (DOC), GAC were regenerated using conventional and novel methods...
December 9, 2016: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28006704/combined-uv-treatment-and-ozonation-for-the-removal-of-by-product-precursors-in-swimming-pool-water
#18
Waqas A Cheema, Kamilla M S Kaarsholm, Henrik R Andersen
Both UV treatment and ozonation are used to reduce different types of disinfection by-products (DBPs) in swimming pools. UV treatment is the most common approach, as it is particularly efficient at removing combined chlorine. However, the UV treatment of pool water increases chlorine reactivity and the formation of chloro-organic DBPs such as trihalomethanes. Based on the similar selective reactivity of ozone and chlorine, we hypothesised that the created reactivity to chlorine, as a result of the UV treatment of dissolved organic matter in swimming pool water, might also be expressed as increased reactivity to ozone...
December 10, 2016: Water Research
https://www.readbyqxmd.com/read/27998787/formation-and-reactivity-of-inorganic-and-organic-chloramines-and-bromamines-during-oxidative-water-treatment
#19
Michèle B Heeb, Ina Kristiana, Daniela Trogolo, J Samuel Arey, Urs von Gunten
The formation and further reactions of halamines during oxidative water treatment can be relevant for water quality. In this study, we investigated the formation and reactivity of several inorganic and organic halamines (monochloramine, N-chloromethylamine, N-chlorodimethylamine, monobromamine, dibromamine, N-bromomethylamine, N,N-dibromomethylamine, and N-bromodimethylamine) by kinetic experiments, transformation product analysis, and quantum chemical computations. Kinetic model simulations were conducted to evaluate the relevance of halamines for various water treatment scenarios...
November 30, 2016: Water Research
https://www.readbyqxmd.com/read/27993469/stabilization-and-prolonged-reactivity-of-aqueous-phase-ozone-with-cyclodextrin
#20
Adam Dettmer, Raymond Ball, Thomas B Boving, Naima A Khan, Tanner Schaub, Nilusha Sudasinghe, Carlos A Fernandez, Kenneth C Carroll
Recalcitrant organic groundwater contaminants, such as 1,4-dioxane, may require strong oxidants for complete mineralization. However, their efficacy for in-situ chemical oxidation (ISCO) is limited by oxidant decay and reactivity. Hydroxypropyl-β-cyclodextrin (HPβCD) was examined for its ability to stabilize aqueous-phase ozone (O3) and prolong oxidation potential through inclusion complex formation. Partial transformation of HPβCD by O3 was observed. However, HPβCD proved to be sufficiently recalcitrant, because it was only partially degraded in the presence of O3...
January 2017: Journal of Contaminant Hydrology
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