Article
Engineering, Environmental
Alexander John, Irene Carra, Bruce Jefferson, Monika Jodkowska, Adam Brookes, Peter Jarvis
Summary: The application of microbubbles in water treatment has shown to enhance gas-liquid contacting processes and compound removal compared to conventional bubbling techniques. However, this study found that there was no significant difference in hydroxyl radical generation between microbubble and conventional bubble ozonation systems.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Engineering, Environmental
Emil Bein, Bettina Seiwert, Thorsten Reemtsma, Jorg E. Drewes, Uwe Huebner
Summary: Several oxidative treatment technologies have been studied and applied for the removal of monocyclic hydroaromatic carbon from water. However, little is known about the formation of transformation products and their fate in biodegradation. This study demonstrates that O3/H2O2 treatment leads to less hydroxylated aromatic transformation products compared to UV/H2O2 treatment, and raises questions regarding the biodegradability of oxidation products. The study provides new insights into the oxidation of monocyclic aromatics and has implications for treatment applications.
JOURNAL OF HAZARDOUS MATERIALS
(2023)
Article
Engineering, Environmental
Abdisa Jabesa, Pallab Ghosh
Summary: Ozone-based microbubble technology demonstrated higher efficiency in oxidizing DMSO compared to conventional ozone millibubbles, with further improvement achieved by coupling with H2O2. While the generation of center dot OH from a certain amount of H2O2 had a positive effect, an excessive dosage had a negative impact. The TOC removal efficiency of ozone microbubbles was significantly better than that of ozone millibubbles.
JOURNAL OF WATER PROCESS ENGINEERING
(2021)
Article
Environmental Sciences
B. Mathon, M. Coquery, Z. Liu, Y. Penru, A. Guillon, M. Esperanza, C. Miege, J-M. Choubert
Summary: This study investigated the degradation of micropollutants in wastewater through ozonation, identifying different removal pathways and rates for various types of organic micropollutants. The research found that low and medium oxidizable micropollutants were mainly removed through indirect pathways, while high oxidizable micropollutants were eliminated through direct pathways. The model developed in the study successfully simulated the removal efficiencies of specific micropollutants in batch experiments and in a full-scale ozonation process.
Article
Environmental Sciences
Xiaoyu Jiao, Congcong He, Huan Yu, Jun He, Chengjun Wang
Summary: Photochemical reactions involving aqueous HNO3 and H2O2 in polar stratospheric clouds can lead to the production of halogen radicals, which may contribute to ozone depletion.
Article
Chemistry, Multidisciplinary
Marcelo I. Guzman, Elizabeth A. Pillar-Little, Alexis J. Eugene
Summary: This study investigates the alteration of the catechol film's chemical composition and surface marking during the heterogeneous oxidation process. The results provide new insights into surface reactions through various techniques, and they explain how polyphenol oligomers contribute to the formation of organic carbon in atmospheric aerosols.
Article
Environmental Sciences
Liina Onga, Eneliis Kattel-Salusoo, Marina Trapido, Sergei Preis
Summary: This study experimentally investigated the oxidation of the widely used anti-inflammatory corticosteroid dexamethasone (DXM) using gas-phase pulsed corona discharge (PCD). The results showed that PCD had higher energy efficiency compared to ozonation and was effective in oxidizing DXM at different pH levels and concentrations. Radical oxidation was identified as the dominant transformation pathway for DXM. However, high concentrations of DXM during PCD treatment may lead to increased toxicity, which requires further investigation.
Article
Engineering, Chemical
Igor M. Piskarev
Summary: The study investigates the oxidation of substances in aqueous solutions using corona electric discharge to generate hydroxyl radicals. The experiments demonstrate the potential for reducing energy consumption by initiating and maintaining chain reactions, though inhibition of chain oxidative reactions of phenol was observed under certain conditions.
PLASMA CHEMISTRY AND PLASMA PROCESSING
(2021)
Article
Green & Sustainable Science & Technology
Snigdha Khuntia, Manish Kumar Sinha, Parveen Dalal, Arunima Singh
Summary: The combination of ozone and UV irradiation in aqueous mode has been investigated for removing SO2 and NOX. Various combinations of ozone, flue gas, and UV irradiation power were attempted to achieve complete removal of flue gases. The amount of hydroxyl radicals generated by UV and O3 combination was measured. A comprehensive comparison of the contribution of oxidants such as ozone, UV, and hydroxyl radicals was depicted. To reduce power consumption, it is important to find a suitable route, which has been achieved by changing the operation mode of gases, resulting in over 95% NOX and almost 100% SO2 removal.
JOURNAL OF CLEANER PRODUCTION
(2023)
Article
Environmental Sciences
Yanhui Sun, Xiaoxiao Chen, Lin Liu, Fei Xu, Xiaochen Zhang
Summary: In this study, gas phase reaction mechanisms and kinetic parameters of eugenol with hydroxyl radicals and ozone molecules were calculated. The results suggest that eugenol has a short atmospheric lifetime. This work provides theoretical guidance for the photochemical reaction mechanisms of eugenol in the atmosphere and serves as a reference for future experimental research.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Horticulture
Surisa Phornvillay, Suwanan Yodsarn, Jiraporn Oonsrithong, Varit Srilaong, Nutthachai Pongprasert
Summary: This study found that using H2O2 and AOP treatment can effectively reduce microbial contamination in roselle seeds. The improved AOP treatment showed the highest antimicrobial activity and promoted seed germination and improved the quality and nutritional value of microgreens.
Article
Engineering, Environmental
Peng Zhang, Jiayu Liu, Hao Yu, Dong Cheng, Hui Liu, Songhu Yuan
Summary: Hydroxyl radical (center dot OH) oxidation is an important pathway for element cycling and contaminant removal in redox fluctuating environments. Fe(II) is the main electron contributor for center dot OH production. However, the kinetic model of Fe(II) oxidation, center dot OH production, and contaminant removal is not clear. Therefore, this study conducted experiments to explore the variation of Fe(II) species, center dot OH, and a representative contaminant (TCE) during sediment oxygenation, and developed a kinetic model. The model accurately fitted the concentration time trajectories and provided insights into the relative contribution of different Fe(II) species and their role in center dot OH production and TCE degradation.
Article
Chemistry, Multidisciplinary
Ting Li, Zhao Cui, Jing Sun, Qian Li, Yongdong Wang, Guangyue Li
Summary: Research has found that nanobubble technology can accelerate the degradation of ferrous ions by generating hydroxyl radicals through oxidation reactions. This process is facilitated by the presence of copper ions and a strong acidic environment. The hydroxyl radicals react with the ferrous ions and interact with molecular oxygen to further enhance the catalytic oxidation by copper ions. Therefore, nanobubbles hold potential for enhancing oxidation processes.
Article
Engineering, Environmental
Ying Li, Yan Wang, Zhifei Dou, Yangxian Liu
Summary: This article discusses the modification of biomass porous carbon using an environmentally friendly UV/H2O2 advanced oxidation process (AOP) to capture gaseous Hg0. The results show that UV/H2O2 AOP modification can increase the surface area and oxygen functional groups on the carbon, leading to enhanced sorption removal of gaseous Hg0.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Engineering, Environmental
Yinghui Mo, Manman Du, Shuai Cui, Hong Wang, Xin Zhao, Ming Zhang, Jianxin Li
Summary: By coupling the denitrifying biocathode and MnOx/Ti anode, this study successfully removed both carbon and nitrogen pollutants from refractory organic wastewater. The denitrifying biocathode-electrocatalytic reactor (DBECR) showed an efficient removal of NO3--N, with a strong correlation between NO3--N removal and charges/current flowing through the circuit. Additionally, DBECR significantly enhanced the degradation of refractory organic carbon, demonstrating its potential for wastewater treatment.
JOURNAL OF HAZARDOUS MATERIALS
(2021)
Article
Chemistry, Physical
Norio Nakayama, Masayoshi Takahashi
Article
Environmental Sciences
Kazunori Minamikawa, Masayoshi Takahashi, Tomoyuki Makino, Kanako Tago, Masahito Hayatsu
ENVIRONMENTAL RESEARCH LETTERS
(2015)
Article
Polymer Science
Kohei Matsuura, Takashi Nishiyama, Eriko Sato, Masashi Yamamoto, Masayoshi Takahashi, Kunihiko Koike, Hideo Horibe
JOURNAL OF PHOTOPOLYMER SCIENCE AND TECHNOLOGY
(2015)
Article
Polymer Science
Kohei Matsuura, Takashi Nishiyama, Eriko Sato, Masashi Yamamoto, Tomosumi Kamimura, Masayoshi Takahashi, Kunihiko Koike, Hideo Horibe
JOURNAL OF PHOTOPOLYMER SCIENCE AND TECHNOLOGY
(2016)
Article
Polymer Science
Masayoshi Takahashi, Yasuyuki Shirai, Akinobu Teramoto, Tunejirou Takahashi, Katsumi Tatera, Kouhei Matsuura, Hideo Horibe
JOURNAL OF PHOTOPOLYMER SCIENCE AND TECHNOLOGY
(2016)
Article
Environmental Sciences
Pan Li, Masayoshi Takahashi, Kaneo Chiba
Article
Environmental Sciences
Pan Li, Masayoshi Takahashi, Kaneo Chiba
Article
Chemistry, Physical
Masayoshi Takahashi, Hiroaki Ishikawa, Toshiyuki Asano, Hideo Horibe
JOURNAL OF PHYSICAL CHEMISTRY C
(2012)
Article
Materials Science, Multidisciplinary
Sae Hayakumo, Shinichi Arakawa, Masayoshi Takahashi, Keiko Kondo, Yoshihiro Mano, Yuichi Izumi
SCIENCE AND TECHNOLOGY OF ADVANCED MATERIALS
(2014)
Article
Nanoscience & Nanotechnology
Mikio Fukuhara, Tomoyuki Kuroda, Fumihiko Hasegawa, Masayoshi Takahashi, Tomoyuki Suwa, Toshiyuki Hashida, Kazuhisa Sato, Masahiko Nishijima, K. Konno
Article
Chemistry, Multidisciplinary
Masayoshi Takahashi, Yasuyuki Shirai, Shigetoshi Sugawa
Summary: Microbubbles collapse underwater, generating free radicals such as hydroxyl radicals, especially under strongly acidic conditions. The environmental changes caused by the collapse of microbubbles may trigger radical generation by dispersing accumulated chemical potential. Experiments also show that ESR signals can still be detected in water treated with microbubbles even months after their dispersion, indicating the potential role of iron ions in stabilizing and converting microbubbles.
Article
Chemistry, Multidisciplinary
Masayoshi Takahashi, Ryo Nakatsuka, Shuzo Kutsuna, Yasuyuki Shirai, Shigetoshi Sugawa
Summary: This study evaluated the effectiveness of ozone microbubble treatment for mineralizing poly(vinyl alcohol) (PVA) in solution. The results showed that ozone microbubbles could effectively mineralize PVA, while traditional ozone bubbling methods were not as efficient.
Article
Chemistry, Physical
Satoshi Takeya, Akihiro Hachikubo, Hirotoshi Sakagami, Hirotsugu Minami, Satoshi Yamashita, Masayoshi Takahashi, Keiichi Hirano, Kazuyuki Hyodo, Akio Yoneyama
Summary: Understanding the dissolution processes of natural methane (CH4) hydrates is crucial for assessing the amount of methane released into seawater from unconventional natural gas resources. High-resolution experiments have successfully visualized the spatial relationships between methane hydrates and seawater, revealing that dissociation of methane hydrates leads to the formation of microbubbles.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Chemistry, Physical
Masayoshi Takahashi, Kaneo Chiba, Pan Li
JOURNAL OF PHYSICAL CHEMISTRY B
(2007)
