Article
Engineering, Environmental
Xiangtong Kong, Shikha Garg, Mahshid Mortazavi, Jinxing Ma, T. David Waite
Summary: This study presents the preparation and performance of an Al2O3-supported Fe catalyst for heterogeneous catalytic ozonation (HCO). The NS-Fe-Al2O3 catalyst demonstrated significantly improved removal of organic pollutants compared to conventional catalysts. It also exhibited resistance to inhibitory effects of chloride and sulfate ions commonly found in industrial effluents.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Article
Engineering, Environmental
Yuting Yuan, Shikha Garg, Jinxing Ma, T. David Waite
Summary: In this study, copper aluminum layered hydroxides and copper oxide were used as catalysts for heterogeneous catalytic ozonation, targeting the removal of oxalate and formate contaminants. The role of the catalyst in contaminant removal was elucidated, with Cu-Al LDHs facilitating slow decay of O-3 to form surface hydroxyl radicals, while CuO rapidly transforms O-3 into surface-located hydroxyl radicals and/or other oxidants. Futile consumption of surface-located oxidants via interaction with the catalyst surface was minimal for Cu-Al LDHs, but becomes significant with higher CuO dosages.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2021)
Article
Biotechnology & Applied Microbiology
Faheem Nawaz, Barkat Ullah Khan, Hamid Ullah, Zia Ul Islam, Ghulam Ullah Khan, Muhammad Khayam, Muhammad Waseem, Gohram Khan, Muhammad Amjad Khan
Summary: In a comparative study of surfactants at low pH, Disodium Ethylene Diamine Tetra Acetic acid showed the highest efficiency in ozone decay and degradation of Oxalic acid, indicating its potential for enhancing the ozonation process. The study confirmed the significant contribution of EDTA-Na-2 to the degradation and removal of TOC, with a synergic effect that was twice as effective as SDBS and three times as effective as SDS.
ENVIRONMENTAL TECHNOLOGY & INNOVATION
(2021)
Article
Engineering, Environmental
Savvina Psaltou, Efthimia Kaprara, Konstantinos Triantafyllidis, Manassis Mitrakas, Anastasios Zouboulis
Summary: This study evaluated the role of PZC and wettability of catalysts in the heterogeneous catalytic ozonation process. Results showed that catalysts with high wettability and neutral to slightly positive surface charge led to enhanced degradation of pollutants, while materials with strongly negative or positive surface charge and low wettability decreased the production of hydroxyl radicals. Ozone's affinity with catalyst surfaces and production of hydroxyl radicals were found to depend on surface charge and wettability, highlighting the importance of these parameters in the process.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2021)
Article
Environmental Sciences
Yang Song, Sha Feng, Wen Qin, Jun Ma
Summary: In this study, expanded graphite (EG) was prepared and its application in catalytic ozonation was investigated. EG prepared at 500 degrees C showed the best performance for the mineralization of oxalic acid. The catalytic performance of EG remained stable after three repeated use, and its activity could be inhibited by certain ions. The degradation of oxalic acid, oxamic acid, and pyruvic acid was pH-dependent, and the degradation process of oxalic acid and oxamic acid was identified as mineralization. Manganese ion could promote the degradation of oxalic acid. The catalytic ozonation with EG has great potential in destroying refractory organic compounds.
ENVIRONMENTAL TECHNOLOGY
(2023)
Article
Environmental Sciences
Hyelyeon Tak, Youngkun Chung, Ga-Yeong Kim, Hyojeon Kim, Jiseon Lee, Jungwan Kang, Quoc Cuong Do, Byung-Uk Bae, Seoktae Kang
Summary: DEHP, a common plastic additive, is known for its high leaching potential and harmful effects on both human and the ecosystem. The use of vanadium oxide (V2O5)-incorporated TiO2 (V2O5/TiO2) catalyst has been found to enhance the degradation efficiency and removal rate of DEHP, with a fast degradation kinetic constant.
Article
Engineering, Environmental
Huan Zhang, Bing Wang, Chunyang Gao, Tianju Zhu, Mingyang Xiong, Hongyang Ren
Summary: This study explores the synergistic effect of acoustic cavitation and microbubbles ozonation (US/O-3) on the degradation of hydrolyzed polyacryamide (HPAM). Various factors affecting HPAM removal are investigated, and the degradation mechanism and possible pathway are identified.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2022)
Article
Environmental Sciences
Di Zheng, Jiashun Cao, Peifang Wang, Junyu Zhao, Yujie Zhao, Teng Zhang, Chao Li
Summary: NiFe(2)O(4) and Ag(0.1)Ni(0.95)Fe(2)O(4) were successfully prepared by sol-gel method and applied for ozone catalytic degradation of DBP. The introduction of Ag(0.1)Ni(0.95)Fe(2)O(4) significantly enhanced ozone decomposition and DBP degradation efficiency.
ENVIRONMENTAL TECHNOLOGY
(2021)
Article
Engineering, Chemical
Dongyao Yue, Shaopo Wang, Jingjie Yu, Ruifei Zhou, Mu Rong, Chang Jing, Wang Zhe
Summary: The role of surface hydroxyl on a catalyst in the decomposition of O3 during heterogeneous catalytic ozonation is important but inadequately studied. This study used hydroxyl-rich goethite (a-FeOOH) as a catalyst for the ozonation of ibuprofen (IBP) and successfully adjusted the state of the hydroxyl groups on the catalyst surface through heating and changing pH. The results showed that a-FeOOH effectively degraded and mineralized IBP during ozonation, primarily promoting the decomposition of O3 into center dot OH. The study identified four types of hydroxyl groups on the catalyst surface and determined that neutral vacancy hydroxyl was the main functional hydroxyl for ozone catalysis. A proposed mechanism involves the decomposition of O3 into center dot OH on the surface hydroxyl.
SEPARATION AND PURIFICATION TECHNOLOGY
(2023)
Article
Environmental Sciences
Jianlin Zhang, Tao Zhuang, Shanjun Liu, Shan Sun, Yongxin Wang, Xinyu Liu, Jin Wang, Rutao Liu
Summary: In this study, mesoporous CeO2 was prepared by the nanocasting method and showed superior catalytic efficiency in the ozonation of atrazine. It has the potential to effectively remove organic pollutants from water and has promising engineering applications.
Article
Engineering, Chemical
Congmin Wang, Yue Liu, Quan Zhao, Rong Guo, Yanyan Dou, Caixia Zhu
Summary: An amorphous copper silicate catalyst was prepared and characterized, showing the formation of Cu-Si binary oxide and CuO on its surface with abundant functional groups. The efficiency of p-chloronitrobenzene (p-CNB) removal was affected by the dosage of catalyst, ozone, and humic acid. The dominant reactive species for p-CNB degradation was found to be hydroxyl radical (•OH) based on scavenger experiments, ESR analysis, and pH experiments. The catalyst exhibited good catalytic activity and stability for five consecutive cycles.
DESALINATION AND WATER TREATMENT
(2023)
Article
Chemistry, Physical
Meirong Zeng, Chen-Lin Liu, Kevin R. Wilson
Summary: During the examination of the reaction between chlorine atoms and alkenes in the presence of Cl-2, we observed a significant increase in reactivity and the dominance of chlorinated reaction products, even under high O-2 conditions. These findings suggest a multiphase catalytic coupling between free radical oxidation and electrophilic Cl-2 addition, with the production of oxygenated reaction intermediates acting as gas-liquid phase-transfer catalysts (gl-PTCs) to enhance electrophilic addition. This work demonstrates the importance of reimagining multiphase reaction schemes of aerosols for understanding catalytic reaction mechanisms.
JOURNAL OF PHYSICAL CHEMISTRY A
(2022)
Article
Environmental Sciences
Pengfei Yan, Yaping Ye, Mingwen Wang
Summary: A novel magnetic catalyst was synthesized and applied in heterogeneous catalytic ozonation process. The catalyst showed excellent removal efficiency of organic pollutants and demonstrated significant catalytic effect on ozone.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2022)
Article
Engineering, Environmental
Lianxue Wei, Kangxin Wen, Jinfeng Lu, Jun Ma
Summary: Catalytic ozonation using two different synthesized catalysts, alpha-FeOOH and CeO2, was conducted on real filtered water, showing that CeO2 was more effective in removing low molecular weight compounds and refractory compounds, while alpha-FeOOH generated higher concentrations of carboxylic acids.
JOURNAL OF HAZARDOUS MATERIALS
(2021)
Article
Chemistry, Physical
Yang Guo, Yixin Zhang, Gang Yu, Yujue Wang
Summary: By comparing the conventional scavenger approach with the proposed probe approach, this study found that using probes can accurately reveal catalytic ozonation mechanisms and provide an effective way to assess the contribution of various ROS to pollutant abatement.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2021)
