Pub Date : 2022-06-14DOI: 10.1080/01919512.2022.2088470
E. Prado, F. Miranda, L. G. de Araujo, G. L. Fernandes, A. L. J. Pereira, M. C. Gomes, A. S. da Silva Sobrinho, M. Baldan, G. Petraconi
ABSTRACT This is an experimental study on the decolorization efficiency and the degradation of organic compounds from textile wastewater by the ozonation process in a batch system. The effects of different sample volumes of textile wastewater over time were investigated. The experiments were performed in a 1 L glass reactor with a magnetic stirrer and a bubble diffuser at the bottom to feed the ozone. The applied cumulative ozone dosage varied at 120 gO3 L−1, 60 gO3 L−1, and 30 gO3 L−1, and the total interaction time for each test was 1 h. To investigate the physicochemical properties of the textile wastewater (solid and liquid phases) before and after the treatment, multiple analytical characterization methods were used: Thermal Gravimetric Analysis, Scanning Electron Microscopy coupled with Energy-Dispersive X-ray Spectroscopy, X-ray diffraction, Fourier Transform Infrared spectroscopy, and Spectrophotometer. The most perceptive change was observed in the color of the liquid medium, which turned from black to transparent, and a visual color number indicator known as DurchsichtFarbZahl (DFZ) was used for the evaluation of this process. Absorbance values decreased about 3.5 times after 5 min of treatment with a 0.15 L sample volume, and these values differed for tests with larger sample volumes. FTIR spectroscopy demonstrated that the bands’ intensities associated with the C − H, C − N, and C − O decrease during treatment. On the other hand, it was possible to conclude that combining treatment methods to improve the degradation of persistent compounds after the ozonation process is necessary. Finally, the ozonation of the textile wastewater proved to be effective at removing color due to its high reaction capacity. Graphical Abstract
{"title":"Physicochemical Modifications and Decolorization of Textile Wastewater by Ozonation: Performance Evaluation of a Batch System","authors":"E. Prado, F. Miranda, L. G. de Araujo, G. L. Fernandes, A. L. J. Pereira, M. C. Gomes, A. S. da Silva Sobrinho, M. Baldan, G. Petraconi","doi":"10.1080/01919512.2022.2088470","DOIUrl":"https://doi.org/10.1080/01919512.2022.2088470","url":null,"abstract":"ABSTRACT This is an experimental study on the decolorization efficiency and the degradation of organic compounds from textile wastewater by the ozonation process in a batch system. The effects of different sample volumes of textile wastewater over time were investigated. The experiments were performed in a 1 L glass reactor with a magnetic stirrer and a bubble diffuser at the bottom to feed the ozone. The applied cumulative ozone dosage varied at 120 gO3 L−1, 60 gO3 L−1, and 30 gO3 L−1, and the total interaction time for each test was 1 h. To investigate the physicochemical properties of the textile wastewater (solid and liquid phases) before and after the treatment, multiple analytical characterization methods were used: Thermal Gravimetric Analysis, Scanning Electron Microscopy coupled with Energy-Dispersive X-ray Spectroscopy, X-ray diffraction, Fourier Transform Infrared spectroscopy, and Spectrophotometer. The most perceptive change was observed in the color of the liquid medium, which turned from black to transparent, and a visual color number indicator known as DurchsichtFarbZahl (DFZ) was used for the evaluation of this process. Absorbance values decreased about 3.5 times after 5 min of treatment with a 0.15 L sample volume, and these values differed for tests with larger sample volumes. FTIR spectroscopy demonstrated that the bands’ intensities associated with the C − H, C − N, and C − O decrease during treatment. On the other hand, it was possible to conclude that combining treatment methods to improve the degradation of persistent compounds after the ozonation process is necessary. Finally, the ozonation of the textile wastewater proved to be effective at removing color due to its high reaction capacity. Graphical Abstract","PeriodicalId":19580,"journal":{"name":"Ozone: Science & Engineering","volume":"10 1","pages":"276 - 290"},"PeriodicalIF":2.7,"publicationDate":"2022-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84834964","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
ABSTRACT Copper modified sepiolite (Cu-SEP) with high catalytic activity was successfully prepared and used in ozonation to remove oxalic acid from water. The influence of Cu-SEP dosage, initial pH, ozone dosage and initial oxalic acid concentration on the removal of oxalic acid in heterogeneous catalytic ozonation was investigated, and XRD, FTIR, SEM, TEM and XPS were employed to characterize the Cu-SEP to clarify its working mechanism in ozonation. The experimental results showed that under the optimal condition, the removal of oxalic acid could reach 95.8%. Cu element successfully replaced Mg in the sepiolite lattice to form the Cu-SEP, it existed mainly in the form of Cu2+. Cu-SEP contained abundant surface hydroxyl groups, which played an important role in the catalytic ozonation process. With the combination of free radical quenching experiment, the possible mechanism of Cu-SEP catalyzed ozonation to degrade oxalic acid was proposed. After ozonation, Cu-SEP retained the original structure, and exhibited excellent stability and reusability.
{"title":"Catalytic Ozonation by Copper Modified Sepiolite for the Degradation of Oxalic Acid in Water","authors":"Siru Zhang, Yuanxing Huang, Xiaoyue Wang, Bokang Liu, Jun‐Ling Zhao","doi":"10.1080/01919512.2022.2082916","DOIUrl":"https://doi.org/10.1080/01919512.2022.2082916","url":null,"abstract":"ABSTRACT Copper modified sepiolite (Cu-SEP) with high catalytic activity was successfully prepared and used in ozonation to remove oxalic acid from water. The influence of Cu-SEP dosage, initial pH, ozone dosage and initial oxalic acid concentration on the removal of oxalic acid in heterogeneous catalytic ozonation was investigated, and XRD, FTIR, SEM, TEM and XPS were employed to characterize the Cu-SEP to clarify its working mechanism in ozonation. The experimental results showed that under the optimal condition, the removal of oxalic acid could reach 95.8%. Cu element successfully replaced Mg in the sepiolite lattice to form the Cu-SEP, it existed mainly in the form of Cu2+. Cu-SEP contained abundant surface hydroxyl groups, which played an important role in the catalytic ozonation process. With the combination of free radical quenching experiment, the possible mechanism of Cu-SEP catalyzed ozonation to degrade oxalic acid was proposed. After ozonation, Cu-SEP retained the original structure, and exhibited excellent stability and reusability.","PeriodicalId":19580,"journal":{"name":"Ozone: Science & Engineering","volume":"52 1","pages":"247 - 261"},"PeriodicalIF":2.7,"publicationDate":"2022-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91122068","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-04-26DOI: 10.1080/01919512.2022.2066503
E. Epelle, Andrew Macfarlane, M. Cusack, A. Burns, N. Amaeze, William G Mackay, M. Yaseen
ABSTRACT The utilization of gaseous ozone (a powerful oxidant) in air, for disinfection and sterilization purposes, has been extensively studied for diverse applications; however, the optimal deployment of this technology for textile disinfection is deserving of further research attention and is this the focus of this work. In this study, the penetration efficiency of ozone gas into hard-to-reach regions of different garment types is critically examined. The impacts of garment packing density, hanging orientation and ozonation duration are also considered, and the resultant disinfection efficiencies are comparatively analyzed. An ozonation chamber fitted with remote ozone detection is utilized for the ozonation of fabric swatches inoculated with Escherichia coli bacteria. The number of colony-forming units per cm2 and the bacterial lawn area fraction are evaluated pre- and post-ozonation to quantify the level of disinfection. This study shows that the attainment of sufficient ozone concentrations in hard-to-reach regions of different garment types coupled with the inter-garment spacing utilized are vital for effective decontamination. This study also demonstrates the effectiveness of ozonation as a necessary technology for decontamination, particularly in this era, where the sterilization of textiles and other materials is paramount for public health and safety.
{"title":"The Impact of Gaseous Ozone Penetration on the Disinfection Efficiency of Textile Materials","authors":"E. Epelle, Andrew Macfarlane, M. Cusack, A. Burns, N. Amaeze, William G Mackay, M. Yaseen","doi":"10.1080/01919512.2022.2066503","DOIUrl":"https://doi.org/10.1080/01919512.2022.2066503","url":null,"abstract":"ABSTRACT The utilization of gaseous ozone (a powerful oxidant) in air, for disinfection and sterilization purposes, has been extensively studied for diverse applications; however, the optimal deployment of this technology for textile disinfection is deserving of further research attention and is this the focus of this work. In this study, the penetration efficiency of ozone gas into hard-to-reach regions of different garment types is critically examined. The impacts of garment packing density, hanging orientation and ozonation duration are also considered, and the resultant disinfection efficiencies are comparatively analyzed. An ozonation chamber fitted with remote ozone detection is utilized for the ozonation of fabric swatches inoculated with Escherichia coli bacteria. The number of colony-forming units per cm2 and the bacterial lawn area fraction are evaluated pre- and post-ozonation to quantify the level of disinfection. This study shows that the attainment of sufficient ozone concentrations in hard-to-reach regions of different garment types coupled with the inter-garment spacing utilized are vital for effective decontamination. This study also demonstrates the effectiveness of ozonation as a necessary technology for decontamination, particularly in this era, where the sterilization of textiles and other materials is paramount for public health and safety.","PeriodicalId":19580,"journal":{"name":"Ozone: Science & Engineering","volume":"1 1","pages":"232 - 246"},"PeriodicalIF":2.7,"publicationDate":"2022-04-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79782547","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-04-19DOI: 10.1080/01919512.2022.2065242
Eren Ogut, Kutay Armagan
ABSTRACT The key objective of this review is to summarize the available information on the effects of medical ozone therapy in COVID-19 and its therapeutic potentials. An electronic literature search was performed using the PubMed, Cochrane, Web of Science, Science Direct, Scopus, Google Scholar, Ovid Medline, J Stage and China Knowledge Resource Integrated (CNKI) databases to September 2021. In total, 1833 articles were identified. Twenty-six articles were selected out of 667 articles. The most preferred and effective administration method for COVID-19 is major autohemotherapy (MAHT), followed by rectal insufflation and minor autohemotherapy (MiAHT). However, other methods, including ozonized oils and ozonated saline, are also used for COVID-19 due to ease of application, prophylactic and therapeutic effects. In studies, 850 patients were treated with ozone therapy as a complementary treatment. The effectiveness of ozone concentrations below 20 μg/mL or above 45 μg/mL for MAHT are yet to be proven in the COVID-19 patient population, and may be less effective. Complementary ozone therapy combined with antivirals increase the activity of antivirals against COVID-19. Large-scale, multicenter randomized clinical trials are needed to be able to isolate the effect of ozone therapy where the clinical variables are distributed more homogeneously. Also, an extended period of follow-up of COVID-19 patients may give more accurate indications about the effectiveness of the treatment in the long term.
摘要本文综述了医学臭氧治疗新冠肺炎的疗效及其治疗潜力的现有信息。使用PubMed、Cochrane、Web of Science、Science Direct、Scopus、Google Scholar、Ovid Medline、J Stage和中国知网(CNKI)数据库进行电子文献检索至2021年9月。总共鉴定了1833件物品。从667篇文章中选出26篇。对于COVID-19，最优选和最有效的给药方法是大自体血液治疗(MAHT)，其次是直肠灌流和小自体血液治疗(MiAHT)。然而，由于易于使用、具有预防和治疗效果，其他方法，包括臭氧化油和臭氧化盐水，也用于COVID-19。在研究中，850名患者接受了臭氧治疗作为补充治疗。臭氧浓度低于20 μg/mL或高于45 μg/mL对MAHT的有效性尚未在COVID-19患者人群中得到证实，可能效果较差。补充臭氧疗法联合抗病毒药物可提高抗病毒药物对COVID-19的活性。需要大规模、多中心的随机临床试验来分离臭氧治疗的效果，因为臭氧治疗的临床变量分布更为均匀。此外，对COVID-19患者的长期随访可能会更准确地说明长期治疗的有效性。
{"title":"Evaluation of the Potential Impact of Medical Ozone Therapy on Covid-19: A Review Study","authors":"Eren Ogut, Kutay Armagan","doi":"10.1080/01919512.2022.2065242","DOIUrl":"https://doi.org/10.1080/01919512.2022.2065242","url":null,"abstract":"ABSTRACT The key objective of this review is to summarize the available information on the effects of medical ozone therapy in COVID-19 and its therapeutic potentials. An electronic literature search was performed using the PubMed, Cochrane, Web of Science, Science Direct, Scopus, Google Scholar, Ovid Medline, J Stage and China Knowledge Resource Integrated (CNKI) databases to September 2021. In total, 1833 articles were identified. Twenty-six articles were selected out of 667 articles. The most preferred and effective administration method for COVID-19 is major autohemotherapy (MAHT), followed by rectal insufflation and minor autohemotherapy (MiAHT). However, other methods, including ozonized oils and ozonated saline, are also used for COVID-19 due to ease of application, prophylactic and therapeutic effects. In studies, 850 patients were treated with ozone therapy as a complementary treatment. The effectiveness of ozone concentrations below 20 μg/mL or above 45 μg/mL for MAHT are yet to be proven in the COVID-19 patient population, and may be less effective. Complementary ozone therapy combined with antivirals increase the activity of antivirals against COVID-19. Large-scale, multicenter randomized clinical trials are needed to be able to isolate the effect of ozone therapy where the clinical variables are distributed more homogeneously. Also, an extended period of follow-up of COVID-19 patients may give more accurate indications about the effectiveness of the treatment in the long term.","PeriodicalId":19580,"journal":{"name":"Ozone: Science & Engineering","volume":"1 1","pages":"213 - 231"},"PeriodicalIF":2.7,"publicationDate":"2022-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73124386","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-04-13DOI: 10.1080/01919512.2022.2059300
Yuta Fukuda, T. Kuroki, Ryosuke Nishioka, H. Fujishima, H. Yamasaki, Hashira Yamamoto, M. Okubo
ABSTRACT A combined ozone injection and semi-dry chemical NOx and SOx removal process using nonthermal plasma for the treatment of flue gases emitted from glass melting furnaces has been proposed. To further improve the NOx removal, O3 was injected in directions opposite to the direction of gas flow at the center of the semi-dry reactor. Moreover, the effect of the increase in initial concentrations of NO and SO2 was investigated. In addition, the effect of the gas flow rate on NO oxidation, denitration, and desulfurization efficiencies, and the effect of NaOH and concentrations on denitration and desulfurization efficiencies were investigated.
{"title":"Performance Improvement in Semi-dry Ozone Injection NOx and SOx Removal Process for a Glass Furnace Flue Gas","authors":"Yuta Fukuda, T. Kuroki, Ryosuke Nishioka, H. Fujishima, H. Yamasaki, Hashira Yamamoto, M. Okubo","doi":"10.1080/01919512.2022.2059300","DOIUrl":"https://doi.org/10.1080/01919512.2022.2059300","url":null,"abstract":"ABSTRACT A combined ozone injection and semi-dry chemical NOx and SOx removal process using nonthermal plasma for the treatment of flue gases emitted from glass melting furnaces has been proposed. To further improve the NOx removal, O3 was injected in directions opposite to the direction of gas flow at the center of the semi-dry reactor. Moreover, the effect of the increase in initial concentrations of NO and SO2 was investigated. In addition, the effect of the gas flow rate on NO oxidation, denitration, and desulfurization efficiencies, and the effect of NaOH and concentrations on denitration and desulfurization efficiencies were investigated.","PeriodicalId":19580,"journal":{"name":"Ozone: Science & Engineering","volume":"124 1","pages":"453 - 463"},"PeriodicalIF":2.7,"publicationDate":"2022-04-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79851275","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-04-07DOI: 10.1080/01919512.2021.1889329
N. Kishimoto, Haruki Arai
Notice of duplicate publication: Catalytic Effect of Copper on Ozonation in Aqueous Solution Kishimoto, N. and A. Haruki. 2021. “Catalytic Effect of Copper on Ozonation in Aqueous Solution.” Ozone: Science & Engineering. doi: 10.1080/01919512.2021.1889329 Please note that this article has been removed from Ozone: Science & Engineering as it is a Duplicate Publication of: Kishimoto, N. and A. Haruki. 2021. “Catalytic Effect of Copper on Ozonation in Aqueous Solution.” Ozone: Science & Engineering 43(6): 520-26. doi: 10.1080/01919512.2021.1927593 OZONE: SCIENCE & ENGINEERING 2022, VOL. 44, NO. 3, i https://doi.org/10.1080/01919512.2022.2060024
重复出版物通知:铜对水溶液臭氧化的催化作用岸本，N.和A. Haruki, 2021。铜对水溶液中臭氧化的催化作用。臭氧:科学与工程。请注意，本文已从Ozone: Science & Engineering中删除，因为它是:Kishimoto, N. and a . Haruki. 2021的复刊。铜对水溶液中臭氧化的催化作用。臭氧科学与工程，43(6):520-26。doi: 10.1080/01919512.2021.1927593臭氧:科学与工程2022,VOL. 44, NO. 5。3、我https://doi.org/10.1080/01919512.2022.2060024
{"title":"Notice of duplicate publication: Catalytic Effect of Copper on Ozonation in Aqueous Solution","authors":"N. Kishimoto, Haruki Arai","doi":"10.1080/01919512.2021.1889329","DOIUrl":"https://doi.org/10.1080/01919512.2021.1889329","url":null,"abstract":"Notice of duplicate publication: Catalytic Effect of Copper on Ozonation in Aqueous Solution Kishimoto, N. and A. Haruki. 2021. “Catalytic Effect of Copper on Ozonation in Aqueous Solution.” Ozone: Science & Engineering. doi: 10.1080/01919512.2021.1889329 Please note that this article has been removed from Ozone: Science & Engineering as it is a Duplicate Publication of: Kishimoto, N. and A. Haruki. 2021. “Catalytic Effect of Copper on Ozonation in Aqueous Solution.” Ozone: Science & Engineering 43(6): 520-26. doi: 10.1080/01919512.2021.1927593 OZONE: SCIENCE & ENGINEERING 2022, VOL. 44, NO. 3, i https://doi.org/10.1080/01919512.2022.2060024","PeriodicalId":19580,"journal":{"name":"Ozone: Science & Engineering","volume":"39 1","pages":"i - i"},"PeriodicalIF":2.7,"publicationDate":"2022-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81405163","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
ABSTRACT The structure of organic compounds is critical to their degradation rates in various advanced oxidation processes. In this research, 16 organic acids (such as oxalic acid, D-malic acid, oxamic acid, etc.) were used as model contaminants to investigate the mineralization efficiencies of catalytic ozonation with ZnAl layered double hydroxide (ZnAl-LDH). All tests organic acids could be effectively degraded during catalytic ozonation, and good reusability was observed since the unique structure of ZnAl-LDH was kept after the reaction. The effect of temperature on the oxidation of different organic compounds varied based on their molecular structures. In most cases, a proper temperature increase could promote the degradation of organic compounds by catalytic ozonation. The TOC removal kinetic constants had a good linear relationship with the temperature, which proved that the catalytic ozonation of organic matters conformed to the Arrhenius equation, in which the activation energy of various organic acids were between −9.0 and 51.0 kJ·mol−1, and the pre-exponential factors were between 0.003 and 2.45 × 106 min−1. By using linear regression model, it was found that the activation energies of organic acids had a greater correlation with quantum chemical parameters, such as Fukui(0)max, Fukui(+)max, EB3LYP, ELUMO, EHOMO and Bond orders(C-C)max. High correlation of Fukui(0)max and Fukui(+)max indicated the attacking of both free radicals and ozone molecule, respectively. Organic acids with lower energy and C-C bond orders were proved to be simple and readily degradable, and thus much easier to be mineralized during catalytic ozonation.
{"title":"Quantitative Analysis of the Structure of Organic Acids and Their Degradation Rates during Ozonation Catalyzed with ZnAl Layered Double Hydroxide","authors":"Yunjing Jin, Liang Li, Liu Yu, Liuqiang Li, Siru Zhang, Yuanxing Huang","doi":"10.1080/01919512.2022.2057916","DOIUrl":"https://doi.org/10.1080/01919512.2022.2057916","url":null,"abstract":"ABSTRACT The structure of organic compounds is critical to their degradation rates in various advanced oxidation processes. In this research, 16 organic acids (such as oxalic acid, D-malic acid, oxamic acid, etc.) were used as model contaminants to investigate the mineralization efficiencies of catalytic ozonation with ZnAl layered double hydroxide (ZnAl-LDH). All tests organic acids could be effectively degraded during catalytic ozonation, and good reusability was observed since the unique structure of ZnAl-LDH was kept after the reaction. The effect of temperature on the oxidation of different organic compounds varied based on their molecular structures. In most cases, a proper temperature increase could promote the degradation of organic compounds by catalytic ozonation. The TOC removal kinetic constants had a good linear relationship with the temperature, which proved that the catalytic ozonation of organic matters conformed to the Arrhenius equation, in which the activation energy of various organic acids were between −9.0 and 51.0 kJ·mol−1, and the pre-exponential factors were between 0.003 and 2.45 × 106 min−1. By using linear regression model, it was found that the activation energies of organic acids had a greater correlation with quantum chemical parameters, such as Fukui(0)max, Fukui(+)max, EB3LYP, ELUMO, EHOMO and Bond orders(C-C)max. High correlation of Fukui(0)max and Fukui(+)max indicated the attacking of both free radicals and ozone molecule, respectively. Organic acids with lower energy and C-C bond orders were proved to be simple and readily degradable, and thus much easier to be mineralized during catalytic ozonation.","PeriodicalId":19580,"journal":{"name":"Ozone: Science & Engineering","volume":"15 1","pages":"202 - 212"},"PeriodicalIF":2.7,"publicationDate":"2022-03-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80318191","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-03-17DOI: 10.1080/01919512.2022.2052014
A. A. Maksyutova, Yuriy S. Zimin, A. Mustafin
ABSTRACT Reactive capacity of ozone in respect of three representatives of the nitrogenous bases (1,3-dimethylthymine, 1,3,6-trimethyluracil, and 5-hydroxy-1,3,6-trimethyluracil) in two solvents having different polarities (Н2О and CCl4) was investigated with the help of the ultraviolet spectroscopy method. At the first stage of investigations, coefficients of extinction of 1,3-DMU in the selected solvents were determined. At the next stage, kinetics of absorption of ozone by solutions of 1,3-dimethyl-substituted uracils at room temperature (295°K) was studied with the help of the bubbling equipment. It was established that parent compounds (О3 and 1,3-DMU) react in the equimolar relationships, that is, 1 g-mol of the consumed uracil corresponds to 1 g-mol of the absorbed ozone. On the basis of the data on the stoichiometry and kinetics of consumption of the parent compounds, obvious and definitive conclusion was made: the reactions under investigation comply with the kinetic law of the second order (of the first order – in respect of О3 and of the first order – in respect of 1,3-DMU). In the course of further investigations, temperature (from 285°K up to 309°K) dependences of constants of velocities of the second order were investigated, as well as parameters of the Arrhenius equation in respect of reactions of ozone were determined. It was established that the reaction rate constants of reactions between ozone and 1,3-DMU within the medium of the nonpolar organic solvent (CCl4) exceed the reaction rate constants within the medium of the polar solvent (Н2О).
{"title":"Influence of Solvent upon Reactive Capacity of Ozone in Respect of 1,3-Dimethyl-Substituted Uracils","authors":"A. A. Maksyutova, Yuriy S. Zimin, A. Mustafin","doi":"10.1080/01919512.2022.2052014","DOIUrl":"https://doi.org/10.1080/01919512.2022.2052014","url":null,"abstract":"ABSTRACT Reactive capacity of ozone in respect of three representatives of the nitrogenous bases (1,3-dimethylthymine, 1,3,6-trimethyluracil, and 5-hydroxy-1,3,6-trimethyluracil) in two solvents having different polarities (Н2О and CCl4) was investigated with the help of the ultraviolet spectroscopy method. At the first stage of investigations, coefficients of extinction of 1,3-DMU in the selected solvents were determined. At the next stage, kinetics of absorption of ozone by solutions of 1,3-dimethyl-substituted uracils at room temperature (295°K) was studied with the help of the bubbling equipment. It was established that parent compounds (О3 and 1,3-DMU) react in the equimolar relationships, that is, 1 g-mol of the consumed uracil corresponds to 1 g-mol of the absorbed ozone. On the basis of the data on the stoichiometry and kinetics of consumption of the parent compounds, obvious and definitive conclusion was made: the reactions under investigation comply with the kinetic law of the second order (of the first order – in respect of О3 and of the first order – in respect of 1,3-DMU). In the course of further investigations, temperature (from 285°K up to 309°K) dependences of constants of velocities of the second order were investigated, as well as parameters of the Arrhenius equation in respect of reactions of ozone were determined. It was established that the reaction rate constants of reactions between ozone and 1,3-DMU within the medium of the nonpolar organic solvent (CCl4) exceed the reaction rate constants within the medium of the polar solvent (Н2О).","PeriodicalId":19580,"journal":{"name":"Ozone: Science & Engineering","volume":"5 1","pages":"174 - 181"},"PeriodicalIF":2.7,"publicationDate":"2022-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81009135","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-03-13DOI: 10.1080/01919512.2022.2052013
Gwiwoong Nam, M. Jeon, Yoon-E Choi, Jinho Jung
ABSTRACT The aim of this study was to investigate microbubble ozonation for the removal of toxic cyanobacteria, Microcystis aeruginosa. The microbubble ozonation (30 min) at 3.47 mg O3 L−1 decreased the M. aeruginosa concentration from 1.5 × 107 to 0.8 × 107 cell mL−1. However, the acute toxicity (48 h) to Daphnia magna (<24 h old) was considerably increased after the microbubble ozonation, possibly owing to the release of intracellular microcystins (MCs). Considering the release of toxic MCs, the microbubble ozonation was optimized at an environmentally relevant concentration (1.74 × 106 cell mL−1) of M. aeruginosa. Microbubble ozonation at 0.26–1.92 mg O3 L−1 for 30 min removed M. aeruginosa by 26 to 83% without any acute toxicity on D. magna. Moreover, D. magna feeding enhanced the removal rate from 85 to 100% for 48 h. These findings suggest that microbubble ozonation, possibly combined with D. magna biomanipulation, can be a promising tool to control toxic cyanobacteria in ambient water.
{"title":"Toxicity Reduction of Microcystis Aeruginosa Using Microbubble Ozonation","authors":"Gwiwoong Nam, M. Jeon, Yoon-E Choi, Jinho Jung","doi":"10.1080/01919512.2022.2052013","DOIUrl":"https://doi.org/10.1080/01919512.2022.2052013","url":null,"abstract":"ABSTRACT The aim of this study was to investigate microbubble ozonation for the removal of toxic cyanobacteria, Microcystis aeruginosa. The microbubble ozonation (30 min) at 3.47 mg O3 L−1 decreased the M. aeruginosa concentration from 1.5 × 107 to 0.8 × 107 cell mL−1. However, the acute toxicity (48 h) to Daphnia magna (<24 h old) was considerably increased after the microbubble ozonation, possibly owing to the release of intracellular microcystins (MCs). Considering the release of toxic MCs, the microbubble ozonation was optimized at an environmentally relevant concentration (1.74 × 106 cell mL−1) of M. aeruginosa. Microbubble ozonation at 0.26–1.92 mg O3 L−1 for 30 min removed M. aeruginosa by 26 to 83% without any acute toxicity on D. magna. Moreover, D. magna feeding enhanced the removal rate from 85 to 100% for 48 h. These findings suggest that microbubble ozonation, possibly combined with D. magna biomanipulation, can be a promising tool to control toxic cyanobacteria in ambient water.","PeriodicalId":19580,"journal":{"name":"Ozone: Science & Engineering","volume":"182 1","pages":"182 - 190"},"PeriodicalIF":2.7,"publicationDate":"2022-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80339346","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-03-13DOI: 10.1080/01919512.2022.2050183
Zekun Yang, Haitao Yang, Y. Liu, Chaoquan Hu, Hailong Jing, Hongtao Li
ABSTRACT Catalytic ozonation including homogeneous and heterogeneous ozonation has been extensively used in water and wastewater treatment in recent years. The liquid homogeneous catalysts cause secondary pollution and have limited development prospects. The heterogeneous catalyst exists in solid form, which is easy to separate solid from liquid, convenient to operate, and has high catalytic ozone decomposition efficiency. It can effectively mineralize organic pollutants and has great development potential. The catalyst is the core part of the whole method. In this study, the mechanism of heterogeneous catalytic ozone oxidation is briefly introduced. Several common preparation methods of ozone catalysts are reviewed. Various catalytic ozonation catalysts such as metal oxides, metals/metal oxides on supports, and carbon-based materials are summarized in detail. The application of heterogeneous catalytic ozonation in the degradation of phenols, pesticides, dyes, drugs, and other toxic organic pollutants is reviewed. At present, the structure of the catalyst is unstable, the active components of the catalyst are easily lost, and the catalytic effect is lost. Therefore, the development of supported catalysts with good stability has become the main direction of current research. The preparation and application of heterogeneous catalytic oxidation are also reviewed, which will be beneficial to further research.
{"title":"Heterogeneous Catalytic Ozonation for Water Treatment: Preparation and Application of Catalyst","authors":"Zekun Yang, Haitao Yang, Y. Liu, Chaoquan Hu, Hailong Jing, Hongtao Li","doi":"10.1080/01919512.2022.2050183","DOIUrl":"https://doi.org/10.1080/01919512.2022.2050183","url":null,"abstract":"ABSTRACT Catalytic ozonation including homogeneous and heterogeneous ozonation has been extensively used in water and wastewater treatment in recent years. The liquid homogeneous catalysts cause secondary pollution and have limited development prospects. The heterogeneous catalyst exists in solid form, which is easy to separate solid from liquid, convenient to operate, and has high catalytic ozone decomposition efficiency. It can effectively mineralize organic pollutants and has great development potential. The catalyst is the core part of the whole method. In this study, the mechanism of heterogeneous catalytic ozone oxidation is briefly introduced. Several common preparation methods of ozone catalysts are reviewed. Various catalytic ozonation catalysts such as metal oxides, metals/metal oxides on supports, and carbon-based materials are summarized in detail. The application of heterogeneous catalytic ozonation in the degradation of phenols, pesticides, dyes, drugs, and other toxic organic pollutants is reviewed. At present, the structure of the catalyst is unstable, the active components of the catalyst are easily lost, and the catalytic effect is lost. Therefore, the development of supported catalysts with good stability has become the main direction of current research. The preparation and application of heterogeneous catalytic oxidation are also reviewed, which will be beneficial to further research.","PeriodicalId":19580,"journal":{"name":"Ozone: Science & Engineering","volume":"71 1","pages":"147 - 173"},"PeriodicalIF":2.7,"publicationDate":"2022-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83875068","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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