scholarly journals Surface modification of polyethylene microplastic particles during the aqueous-phase ozonation process

2020 ◽  
Vol 26 (5) ◽  
pp. 200412-0
Author(s):  
Rabia Zafar ◽  
Seon Yeong Park ◽  
Chang Gyun Kim
Keyword(s):  
Reactive Oxygen Species ◽  
Surface Modification ◽  
Reaction Time ◽  
Aqueous Phase ◽  
Natural Waters ◽  
Reactive Oxygen ◽  
Oxygen Species ◽  
Ftir Analysis ◽  
Ozone Uptake ◽  
Ozonation Process

Microplastics coexist with the chemical reactive oxygen species in natural waters, however, there is still a lack to elucidate the effect of these radicals on the microplastic surficial oxidation. In this study, the ozonation of polyethylene microplastics was carried out under varying ozone dosages ranging from 4 to 7 mg/min for 60, 120 and 180 min, where its ozone uptake was iodometrically compared and surficial modification was spectroscopically analyzed using FTIR and XPS. For that, the lowest ozone uptake was 16% at 4 mg/min ozone supplied for 60 min whereas the highest was observed of 44% at 7 mg/min ozone added for 180 min. Moreover, in the FTIR analysis, carbonyl (1,600-1,800 cm<sup>-1</sup>) and hydroxyl (3,200-3,600 cm<sup>-1</sup>) indices were improved more than 20% and 13% when they were ozonized at 7 mg/min for 180 min compared to 4 mg/min for 60 min, respectively. XPS also revealed that 7 mg/min of ozone supplied for 180 min provided the highest of oxygen functionalities, but while there was no significant change in C-C bond. It can be concluded that the surficial modification of PE including formation of oxygen functionalities could be more preferably influenced by the reaction time than ozone dosages.

scholarly journals 8.2.1　Generation of Reactive Oxygen Species in Aqueous Phase by Carbon-Ion Beam

RADIOISOTOPES ◽  
2019 ◽  
Vol 68 (10) ◽  
pp. 681-691
Author(s):  
Ken-ichiro Matsumoto ◽  
Minako Nyui ◽  
Megumi Ueno ◽  
Yukihiro Ogawa ◽  
Ikuo Nakanishi
Keyword(s):  
Reactive Oxygen Species ◽  
Aqueous Phase ◽  
Ion Beam ◽  
Reactive Oxygen ◽  
Oxygen Species ◽  
Carbon Ion ◽  
Carbon Ion Beam

Effect of reactive oxygen species generated with ultraviolet lamp and plasma on polyimide surface modification

2017 ◽  
Vol 49 (11) ◽  
pp. 1069-1077 ◽  
Author(s):  
Takahiro Kondo ◽  
Ryota Watanabe ◽  
Yuta Shimoyama ◽  
Kazuho Shinohe ◽  
Sergei A. Kulinich ◽  
...  
Keyword(s):  
Reactive Oxygen Species ◽  
Surface Modification ◽  
Reactive Oxygen ◽  
Oxygen Species ◽  
Ultraviolet Lamp

Role of reactive oxygen species in the dechlorination of trichloroethene and 1.1.1-trichloroethane in aqueous phase in UV/TiO 2 systems

2015 ◽  
Vol 123 ◽  
pp. 367-375 ◽  
Author(s):  
Landry Biyoghe Bi Ndong ◽  
Xiaogang Gu ◽  
Shuguang Lu ◽  
Murielle Primaelle Ibondou ◽  
Zhaofu Qiu ◽  
...  
Keyword(s):  
Reactive Oxygen Species ◽  
Aqueous Phase ◽  
Reactive Oxygen ◽  
Oxygen Species

scholarly journals Development of superoxide dismutase mimetic surfaces to reduce accumulation of reactive oxygen species for neural interfacing applications

2014 ◽  
Vol 2 (16) ◽  
pp. 2248-2258 ◽  
Author(s):  
Kelsey A. Potter-Baker ◽  
Jessica K. Nguyen ◽  
Kyle M. Kovach ◽  
Martin M. Gitomer ◽  
Tyler W. Srail ◽  
...  
Keyword(s):  
Reactive Oxygen Species ◽  
Superoxide Dismutase ◽  
Surface Modification ◽  
Composite Coating ◽  
Reactive Oxygen ◽  
Oxygen Species ◽  
Reactive Oxygen Species Accumulation ◽  
Species Accumulation ◽  
Neural Interfacing

In order to reduce inflammatory-mediated reactive oxygen species accumulation, we have developed an anti-oxidative surface modification consisting of a composite coating of adsorbed and immobilized superoxide dismutase mimetic.

scholarly journals Production of hydrogen peroxide in an intra-meander hyporheic zone at East River, Colorado

2022 ◽  
Vol 12 (1) ◽  
Author(s):  
Xiu Yuan ◽  
Tongxu Liu ◽  
Patricia Fox ◽  
Amrita Bhattacharyya ◽  
Dipankar Dwivedi ◽  
...  
Keyword(s):  
Reactive Oxygen Species ◽  
Surface Water ◽  
Natural Waters ◽  
Hyporheic Zone ◽  
Reactive Oxygen Species Generation ◽  
Reactive Oxygen ◽  
Oxygen Species ◽  
East River ◽  
Early Afternoon ◽  
Production Of Hydrogen

AbstractThe traditionally held assumption that photo-dependent processes are the predominant source of H2O2 in natural waters has been recently questioned by an increrasing body of evidence showing the ubiquitiousness of H2O2 in dark water bodies and in groundwater. In this study, we conducted field measurement of H2O2 in an intra-meander hyporheic zone and in surface water at East River, CO. On-site detection using a sensitive chemiluminescence method suggests H2O2 concentrations in groundwater ranging from 6 nM (at the most reduced region) to ~ 80 nM (in a locally oxygen-rich area) along the intra-meander transect with a maxima of 186 nM detected in the surface water in an early afternoon, lagging the maximum solar irradiance by ∼ 1.5 h. Our results suggest that the dark profile of H2O2 in the hyporheic zone is closely correlated to local redox gradients, indicating that interactions between various redox sensitive elements could play an essential role. Due to its transient nature, the widespread presence of H2O2 in the hyporheic zone indicates the existence of a sustained balance between H2O2 production and consumption, which potentially involves a relatively rapid succession of various biogeochemically important processes (such as organic matter turnover, metal cycling and contaminant mobilization). More importantly, this study confirmed the occurrence of reactive oxygen species at a subsurface redox transition zone and further support our understanding of redox boundaries on reactive oxygen species generation and as key locations of biogeochemical activity.

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