Pub Date : 2022-09-15DOI: 10.1080/01919512.2022.2125363
S. Liaqat, Samia Tariq, Irum Hayat, Bakhtawar Mobeen, Sarmad Fayyaz, Humaira Jabeen, S. Khalid, Nawshad Muhammad, M. A. Khan
ABSTRACT As antibiotic resistance is increasing daily, the desire to treat an infection without causing any harmful effects assumes increasing importance. Ozone gas is a reactive antioxidant. Its role in blood circulation and uplifting immunity is an ideal complement to achieving curative care treatments. Aside from treatments, the therapeutic and biological effects of ozone may have positive results by reducing tooth demineralization, its antimicrobial capabilities rely upon its ability to oxidize, which produces free radicals, and has immediate action on microbes. The usage of ozone in dentistry is recommended for a variety of purposes, which comprises carious lesion treatments, root canal disinfection, post-surgical treatment, tooth bleaching, periodontal problems, prosthodontics, and orthodontics. Ozone has the potential to be a promising alternative therapy in dentistry. However, well-designed research is needed to analyze ozone’s utilization in the field of dentistry to determine its importance from a clinical perspective so that the general public can benefit from it. This systematic review aims to describe the technique in which ozone can be advantageous as well as the many ways of applications of ozone therapy in dentistry.
{"title":"Therapeutic Effects and Uses of Ozone in Dentistry: A Systematic Review","authors":"S. Liaqat, Samia Tariq, Irum Hayat, Bakhtawar Mobeen, Sarmad Fayyaz, Humaira Jabeen, S. Khalid, Nawshad Muhammad, M. A. Khan","doi":"10.1080/01919512.2022.2125363","DOIUrl":"https://doi.org/10.1080/01919512.2022.2125363","url":null,"abstract":"ABSTRACT As antibiotic resistance is increasing daily, the desire to treat an infection without causing any harmful effects assumes increasing importance. Ozone gas is a reactive antioxidant. Its role in blood circulation and uplifting immunity is an ideal complement to achieving curative care treatments. Aside from treatments, the therapeutic and biological effects of ozone may have positive results by reducing tooth demineralization, its antimicrobial capabilities rely upon its ability to oxidize, which produces free radicals, and has immediate action on microbes. The usage of ozone in dentistry is recommended for a variety of purposes, which comprises carious lesion treatments, root canal disinfection, post-surgical treatment, tooth bleaching, periodontal problems, prosthodontics, and orthodontics. Ozone has the potential to be a promising alternative therapy in dentistry. However, well-designed research is needed to analyze ozone’s utilization in the field of dentistry to determine its importance from a clinical perspective so that the general public can benefit from it. This systematic review aims to describe the technique in which ozone can be advantageous as well as the many ways of applications of ozone therapy in dentistry.","PeriodicalId":19580,"journal":{"name":"Ozone: Science & Engineering","volume":"21 1","pages":"387 - 397"},"PeriodicalIF":2.7,"publicationDate":"2022-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85170845","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 : 2022-09-08DOI: 10.1080/01919512.2022.2117131
Kyohei Uchigami, Hideyasu Nakamura, Kazuo Ogura, T. Mizuno
ABSTRACT The Hanshin Water Supply Authority is the first bulk water supplier in Japan that currently operates two drinking water treatment plants. Both plants employ an ozonation process for the reduction of musty odor compounds, 2-methylisoborneol and geosmin, and trihalomethanes. In this study, we aim to estimate hydroxyl radical (HO∙) exposure in a three-stage countercurrent ozone contactor applied at the Inagawa drinking water treatment plant. We estimated the HO∙ exposure as the product of the ozone exposure multiplied by the RCt value, that is, the ratio of the HO∙ exposure to the ozone exposure. The ozone exposure was estimated by a methodology we developed earlier, and the RCt values were experimentally evaluated in this study. The estimated HO∙ exposure ranged from 0.4 × 10−10 to 6.7 × 10−10 M·s across the contactor during our research period. The highest HO∙ exposure of 6.7 × 10−10 M·s indicated that the reduction ratio of musty odor compounds exceeded 95%. At these exposures, the detected concentration of bromate was 6 µg/L, which is equal to the 60% concentration level of Japan’s water quality standard for drinking water. Further, we attempt to balance the reduction in musty odor compounds with control of bromate formation.
{"title":"Estimation of Hydroxyl Radical Exposure in a three-stage Countercurrent Ozone Contactor – Reduction in Musty Odor Compounds and Formation of Bromate","authors":"Kyohei Uchigami, Hideyasu Nakamura, Kazuo Ogura, T. Mizuno","doi":"10.1080/01919512.2022.2117131","DOIUrl":"https://doi.org/10.1080/01919512.2022.2117131","url":null,"abstract":"ABSTRACT The Hanshin Water Supply Authority is the first bulk water supplier in Japan that currently operates two drinking water treatment plants. Both plants employ an ozonation process for the reduction of musty odor compounds, 2-methylisoborneol and geosmin, and trihalomethanes. In this study, we aim to estimate hydroxyl radical (HO∙) exposure in a three-stage countercurrent ozone contactor applied at the Inagawa drinking water treatment plant. We estimated the HO∙ exposure as the product of the ozone exposure multiplied by the RCt value, that is, the ratio of the HO∙ exposure to the ozone exposure. The ozone exposure was estimated by a methodology we developed earlier, and the RCt values were experimentally evaluated in this study. The estimated HO∙ exposure ranged from 0.4 × 10−10 to 6.7 × 10−10 M·s across the contactor during our research period. The highest HO∙ exposure of 6.7 × 10−10 M·s indicated that the reduction ratio of musty odor compounds exceeded 95%. At these exposures, the detected concentration of bromate was 6 µg/L, which is equal to the 60% concentration level of Japan’s water quality standard for drinking water. Further, we attempt to balance the reduction in musty odor compounds with control of bromate formation.","PeriodicalId":19580,"journal":{"name":"Ozone: Science & Engineering","volume":"25 1","pages":"191 - 201"},"PeriodicalIF":2.7,"publicationDate":"2022-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83235504","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 : 2022-09-03DOI: 10.1080/01919512.2022.2110734
Barry L. Loeb
There are those who state that ozone is now a mature technology. This impression is most likely based on the well-established use of ozone for drinking water purification. Ozone is very effective in improving taste and odor, helping to eliminate the formation of trihalomethanes, provide disinfection and help filtration performance. Ozone has been used for disinfection of drinking water for large municipalities for more than 50 years. This is definitely mature technology. However, even with drinking water treatment, there have been new developments with ozone, particularly when considering ozone mass transfer. Historically water treatment plants used porous plate diffusers and many still do today. In the interest of saving space and reducing capital, operational and maintenance costs, sidestream venturi injectors (SVIs) have been developed to introduce ozone into water. Over the past several years this process has been optimized using computational fluid dynamics to help in determine the optimum injection nozzle locations for a particular process. Today, a large percentage of new drinking waters are using SVIs. Another significant advance has been the use of static mixers to improve the ozone dissolution. Many remember the old air-fed ozone generators equipped with elaborate air-drying systems. These were the original workhorse generators of the ozone industry. Engineers and scientists have since developed new power conversion technologies and dielectrics tailored to oxygen feed gas resulting in considerable improvement in efficiency and reduction of space. We continue to see incremental improvement in ozone generator performance and the use of very reliable efficient power conversion equipment. Scientists are now demonstrating how a Xenon Excimer can be used to produce very high concentration ozone at an economical power consumption. In the early days of ozone, scientists discovered advanced oxidation where ozone combined with hydrogen peroxide formed free radicals which could quickly oxidize difficult contaminants. This led to the concept of catalytic ozonation where ozone combined with a solid catalyst could provide a similar benefit. This new technology is being heavily researched and may soon lead to commercial processes. Ozone was considered and used for wastewater treatment in the 1980s but fell out of favor due to operating costs and possibly misapplication. Today, there is emphasis on water reuse – reclaiming wastewater for use as potable water. Ozone combined with biological filtration has been found to be an newly effective process to accomplish this, particularly in areas where concentrate from reverse osmosis/ultrafiltration plants cannot be effectively disposed. IN 1997 the FDA approved ozone as GRAS for foods. In 2001 ozone was approved as an antimicrobial additive for direct contact with foods. Research on how to apply this newly approved technology began in earnest and continues today and ozone is tested on new food products for i
{"title":"Ozone: Both Mature and New","authors":"Barry L. Loeb","doi":"10.1080/01919512.2022.2110734","DOIUrl":"https://doi.org/10.1080/01919512.2022.2110734","url":null,"abstract":"There are those who state that ozone is now a mature technology. This impression is most likely based on the well-established use of ozone for drinking water purification. Ozone is very effective in improving taste and odor, helping to eliminate the formation of trihalomethanes, provide disinfection and help filtration performance. Ozone has been used for disinfection of drinking water for large municipalities for more than 50 years. This is definitely mature technology. However, even with drinking water treatment, there have been new developments with ozone, particularly when considering ozone mass transfer. Historically water treatment plants used porous plate diffusers and many still do today. In the interest of saving space and reducing capital, operational and maintenance costs, sidestream venturi injectors (SVIs) have been developed to introduce ozone into water. Over the past several years this process has been optimized using computational fluid dynamics to help in determine the optimum injection nozzle locations for a particular process. Today, a large percentage of new drinking waters are using SVIs. Another significant advance has been the use of static mixers to improve the ozone dissolution. Many remember the old air-fed ozone generators equipped with elaborate air-drying systems. These were the original workhorse generators of the ozone industry. Engineers and scientists have since developed new power conversion technologies and dielectrics tailored to oxygen feed gas resulting in considerable improvement in efficiency and reduction of space. We continue to see incremental improvement in ozone generator performance and the use of very reliable efficient power conversion equipment. Scientists are now demonstrating how a Xenon Excimer can be used to produce very high concentration ozone at an economical power consumption. In the early days of ozone, scientists discovered advanced oxidation where ozone combined with hydrogen peroxide formed free radicals which could quickly oxidize difficult contaminants. This led to the concept of catalytic ozonation where ozone combined with a solid catalyst could provide a similar benefit. This new technology is being heavily researched and may soon lead to commercial processes. Ozone was considered and used for wastewater treatment in the 1980s but fell out of favor due to operating costs and possibly misapplication. Today, there is emphasis on water reuse – reclaiming wastewater for use as potable water. Ozone combined with biological filtration has been found to be an newly effective process to accomplish this, particularly in areas where concentrate from reverse osmosis/ultrafiltration plants cannot be effectively disposed. IN 1997 the FDA approved ozone as GRAS for foods. In 2001 ozone was approved as an antimicrobial additive for direct contact with foods. Research on how to apply this newly approved technology began in earnest and continues today and ozone is tested on new food products for i","PeriodicalId":19580,"journal":{"name":"Ozone: Science & Engineering","volume":"24 1","pages":"413 - 413"},"PeriodicalIF":2.7,"publicationDate":"2022-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80150660","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 : 2022-08-29DOI: 10.1080/01919512.2022.2114420
Safal Mestri, Sedar Dogan, C. Tizaoui
ABSTRACT In this study, the removal of bromate, a regulated ozone by-product, was evaluated using a strong-base anion (SBA) exchange resin in batch and column experiments. The kinetics studies in batch mode showed that film diffusion-controlled bromate exchange in SBA and the isotherm studies showed that the Langmuir model fitted the experimental results with a maximum exchange capacity of 296.66 mg BrO3 −/g (~1.3 meq/mL resin). In the fixed-bed column studies, breakthrough curves were obtained under different operating conditions to examine the effects of feed flow rate, inlet bromate concentration, and bed height on column performance. A modified n-order Bohart and Adams model (n-BAM-c), which considered the asymmetry of the breakthrough curve and flow channeling, was applied for the first time to describe the experimental data obtained from the column and to predict the breakthrough curves. It was found that n-BAM-c fitted the experimental data well (R2 > 0.99) and the effects of the key operating conditions on the model parameters were determined. Overall, the results show that SBA exchange is suitable for bromate removal from water and n-BAM-c could be a powerful tool for the design and upscaling of bromate ion exchange columns.
在本研究中，研究了强碱阴离子(SBA)交换树脂对调控臭氧副产物溴酸盐的去除效果。批处理模式下的动力学研究表明，SBA中的溴酸盐交换具有薄膜扩散控制，等温线研究表明，Langmuir模型与实验结果吻合，最大交换容量为296.66 mg BrO3−/g (~1.3 meq/mL树脂)。在固定床塔研究中，通过不同操作条件下的突破曲线，考察进料流量、进口溴酸盐浓度和床层高度对塔性能的影响。首次采用考虑突破曲线不对称性和窜流的改进n阶Bohart and Adams模型(n-BAM-c)对实验数据进行描述，并对突破曲线进行预测。结果表明，n- bamc与实验数据拟合良好(R2 > 0.99)，确定了关键操作条件对模型参数的影响。综上所述，SBA交换体适合于去除水中的溴酸盐，n-BAM-c可以作为设计和升级溴酸盐离子交换柱的有力工具。
{"title":"Bromate Removal from Water Using Ion Exchange Resin: Batch and Fixed Bed Column Performance","authors":"Safal Mestri, Sedar Dogan, C. Tizaoui","doi":"10.1080/01919512.2022.2114420","DOIUrl":"https://doi.org/10.1080/01919512.2022.2114420","url":null,"abstract":"ABSTRACT In this study, the removal of bromate, a regulated ozone by-product, was evaluated using a strong-base anion (SBA) exchange resin in batch and column experiments. The kinetics studies in batch mode showed that film diffusion-controlled bromate exchange in SBA and the isotherm studies showed that the Langmuir model fitted the experimental results with a maximum exchange capacity of 296.66 mg BrO3 −/g (~1.3 meq/mL resin). In the fixed-bed column studies, breakthrough curves were obtained under different operating conditions to examine the effects of feed flow rate, inlet bromate concentration, and bed height on column performance. A modified n-order Bohart and Adams model (n-BAM-c), which considered the asymmetry of the breakthrough curve and flow channeling, was applied for the first time to describe the experimental data obtained from the column and to predict the breakthrough curves. It was found that n-BAM-c fitted the experimental data well (R2 > 0.99) and the effects of the key operating conditions on the model parameters were determined. Overall, the results show that SBA exchange is suitable for bromate removal from water and n-BAM-c could be a powerful tool for the design and upscaling of bromate ion exchange columns.","PeriodicalId":19580,"journal":{"name":"Ozone: Science & Engineering","volume":"46 1","pages":"291 - 304"},"PeriodicalIF":2.7,"publicationDate":"2022-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86595717","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 : 2022-08-23DOI: 10.1080/01919512.2022.2115976
Gül DİNÇ ATA, A. Mujdeci
ABSTRACT The aim of this study is to examine the effects of ozone treatment applied at two different times, followed by the in vitro application of a reductant solution, on the shear bond strength of four different restorative materials to enamel and dentin. A total of 400 caries-free human molar teeth were randomly divided into enamel and dentin groups, and each was divided into five subgroups. The O20 group received 20-s ozone, O20 + R received 20-s ozone+reductant solution, O80 received 80-s ozone, O80 + R received 80-s ozone+reductant solution, and C was the control group. Each subgroup was then divided into four more subgroups based on restorative material (i.e., nanohybrid resin composite, silorane-based microhybrid resin composite, compomer, or conventional capsulated glass ionomer cement). After water storage for seven days, shear bond-strength data (MPa) were measured using a universal testing machine at a crosshead speed of 0.5 mm/min until fracture, and failure types were examined. The effects of ozone and ozone+reductant applications on enamel and dentin were examined via scanning electron microscopy (SEM). Bond strength data were statistically evaluated using a three-way analysis of variance and Tukey’s honestly significant difference test (a = 0.05). The bond strength of the control group was like that of the O20 group (p > 0.05), but it was higher than all other groups regardless of the type of restorative material or tooth structure (p < 0.05). Adhesive-type failures were found in most groups. Via SEM examinations, it was observed that ozone applications did not change the enamel morphology, but they did cause narrowing of the dentinal tubule openings in O80 + R.
{"title":"Effect of Ozone on Bond Strength of Different Restorative Materials to Enamel and Dentin","authors":"Gül DİNÇ ATA, A. Mujdeci","doi":"10.1080/01919512.2022.2115976","DOIUrl":"https://doi.org/10.1080/01919512.2022.2115976","url":null,"abstract":"ABSTRACT The aim of this study is to examine the effects of ozone treatment applied at two different times, followed by the in vitro application of a reductant solution, on the shear bond strength of four different restorative materials to enamel and dentin. A total of 400 caries-free human molar teeth were randomly divided into enamel and dentin groups, and each was divided into five subgroups. The O20 group received 20-s ozone, O20 + R received 20-s ozone+reductant solution, O80 received 80-s ozone, O80 + R received 80-s ozone+reductant solution, and C was the control group. Each subgroup was then divided into four more subgroups based on restorative material (i.e., nanohybrid resin composite, silorane-based microhybrid resin composite, compomer, or conventional capsulated glass ionomer cement). After water storage for seven days, shear bond-strength data (MPa) were measured using a universal testing machine at a crosshead speed of 0.5 mm/min until fracture, and failure types were examined. The effects of ozone and ozone+reductant applications on enamel and dentin were examined via scanning electron microscopy (SEM). Bond strength data were statistically evaluated using a three-way analysis of variance and Tukey’s honestly significant difference test (a = 0.05). The bond strength of the control group was like that of the O20 group (p > 0.05), but it was higher than all other groups regardless of the type of restorative material or tooth structure (p < 0.05). Adhesive-type failures were found in most groups. Via SEM examinations, it was observed that ozone applications did not change the enamel morphology, but they did cause narrowing of the dentinal tubule openings in O80 + R.","PeriodicalId":19580,"journal":{"name":"Ozone: Science & Engineering","volume":"3 1","pages":"89 - 101"},"PeriodicalIF":2.7,"publicationDate":"2022-08-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78807731","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 : 2022-08-22DOI: 10.1080/01919512.2022.2114419
Hariprasad Pokkiladathu, Salman Farissi, A. Muthukumar, Muthukumar Muthuchamy
ABSTRACT Organic contaminants such as Bisphenol A are classified as Contaminants of Emerging Concern (CECs). The inability of conventional water and wastewater treatments to remove CECs has made Advanced Oxidation Processes (AOPs) attractive for their removal from water sources. Oxidation species such as hydroxyl radicals are produced by AOPs that degrades and mineralize CECs found in water and wastewater. The present study focuses on using heterogeneous nano-metallic oxide embedded activated carbon (AC) for degrading Bisphenol-A (BPA) present in the water. The catalytic ozonation process was carried out using AC/Cu2O/ZnO as the catalyst. The bimetallic catalyst was characterized using BET, XRD, FESEM, Raman Spectra, and DLS. Total organic carbon (TOC) removal was 19% higher for catalytic ozonation when compared with non-catalytic ozonation. HPLC studies found that BPA was removed by 98%. The optimal conditions for degradation were 650 µg/L, pH 8 and 60 minutes. LC-MS/LC-Q-TOF was utilized to find the degradation pathway.
{"title":"Removal of a Contaminant of Emerging Concern by Heterogeneous Catalytic Ozonation Process with a Novel Nano Bimetallic Catalyst Embedded on Activated Carbon","authors":"Hariprasad Pokkiladathu, Salman Farissi, A. Muthukumar, Muthukumar Muthuchamy","doi":"10.1080/01919512.2022.2114419","DOIUrl":"https://doi.org/10.1080/01919512.2022.2114419","url":null,"abstract":"ABSTRACT Organic contaminants such as Bisphenol A are classified as Contaminants of Emerging Concern (CECs). The inability of conventional water and wastewater treatments to remove CECs has made Advanced Oxidation Processes (AOPs) attractive for their removal from water sources. Oxidation species such as hydroxyl radicals are produced by AOPs that degrades and mineralize CECs found in water and wastewater. The present study focuses on using heterogeneous nano-metallic oxide embedded activated carbon (AC) for degrading Bisphenol-A (BPA) present in the water. The catalytic ozonation process was carried out using AC/Cu2O/ZnO as the catalyst. The bimetallic catalyst was characterized using BET, XRD, FESEM, Raman Spectra, and DLS. Total organic carbon (TOC) removal was 19% higher for catalytic ozonation when compared with non-catalytic ozonation. HPLC studies found that BPA was removed by 98%. The optimal conditions for degradation were 650 µg/L, pH 8 and 60 minutes. LC-MS/LC-Q-TOF was utilized to find the degradation pathway.","PeriodicalId":19580,"journal":{"name":"Ozone: Science & Engineering","volume":"14 1","pages":"361 - 373"},"PeriodicalIF":2.7,"publicationDate":"2022-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73094980","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 : 2022-08-08DOI: 10.1080/01919512.2022.2109590
Seyed Mehdi Pourmoheb Hosseini, N. Chaibakhsh
ABSTRACT In this study, Fe3O4.MnO2.MoS2 nanocatalyst has been fabricated for the first time and applied in the photocatalytic ozonation (PCO) process. The efficiency of this ternary heterostructure nanocomposite was evaluated in the removal of Acid Blue 113 (AB113) dye with 100 mg.L−1 concentration utilizing response surface methodology (RSM). The optimal condition of the process was attained at pH = 3, using 2 mg of the nanocatalyst and 300 mg.L−1 ozone dosage applied over 20 min. High efficiency of AB113 removal (99%) was observed at the optimal condition. In addition, the performance of the synthesized catalyst in the PCO process was investigated in the treatment of a real textile effluent sample. The PCO has been found to be more efficient than the individual photocatalysis and catalytic ozonation methods due to the synergistic effect between the two oxidation systems. The results proved that Fe3O4.MnO2.MoS2 can be used as a highly efficient catalyst in the PCO process.
{"title":"Efficient Dye Removal Using Fe3O4.MnO2.MoS2 Nanocomposite in Optimized Photocatalytic Ozonation Process","authors":"Seyed Mehdi Pourmoheb Hosseini, N. Chaibakhsh","doi":"10.1080/01919512.2022.2109590","DOIUrl":"https://doi.org/10.1080/01919512.2022.2109590","url":null,"abstract":"ABSTRACT In this study, Fe3O4.MnO2.MoS2 nanocatalyst has been fabricated for the first time and applied in the photocatalytic ozonation (PCO) process. The efficiency of this ternary heterostructure nanocomposite was evaluated in the removal of Acid Blue 113 (AB113) dye with 100 mg.L−1 concentration utilizing response surface methodology (RSM). The optimal condition of the process was attained at pH = 3, using 2 mg of the nanocatalyst and 300 mg.L−1 ozone dosage applied over 20 min. High efficiency of AB113 removal (99%) was observed at the optimal condition. In addition, the performance of the synthesized catalyst in the PCO process was investigated in the treatment of a real textile effluent sample. The PCO has been found to be more efficient than the individual photocatalysis and catalytic ozonation methods due to the synergistic effect between the two oxidation systems. The results proved that Fe3O4.MnO2.MoS2 can be used as a highly efficient catalyst in the PCO process.","PeriodicalId":19580,"journal":{"name":"Ozone: Science & Engineering","volume":"8 1","pages":"346 - 360"},"PeriodicalIF":2.7,"publicationDate":"2022-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79737363","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 : 2022-08-07DOI: 10.1080/01919512.2022.2106185
Z. T. Özaslan, Ş. Ibanoğlu
ABSTRACT Gum Arabic (GA) samples with 6% (w/v) concentration in water were ozonated for 5, 30, and 60 min, corresponding to 0.0030, 0.0125, and 0.0140 g consumed ozone/L, respectively. Ozonation steadily reduced the viscosity, flow, and consistency index of GA suspensions significantly (P < 0.05). Although no apparent changes were observed in the general chemical structure of GA samples, an increase in the absorbance of -OH bends was detected by FTIR analysis. DSC peak temperatures (292.0 ± 0.1 to 281.0 ± 0.9 °C) and pH values of samples (4.84 ± 0.13 to 2.90 ± 0.09) were decreased upon ozonation. Small but statistically significant differences (P < 0.05) were obtained for water solubility and water absorption index of samples after ozonation. Phenolic compounds and radical scavenging activities in GA were increased significantly (P < 0.05) by ozonation. Ozonation, which is an environmental-friendly unit operation, would offer valuable contributions to relevant industries with improved properties of GA.
{"title":"Rheological, Thermal, Structural, and Chemical Changes during Oxidation of Gum Arabic by Ozone","authors":"Z. T. Özaslan, Ş. Ibanoğlu","doi":"10.1080/01919512.2022.2106185","DOIUrl":"https://doi.org/10.1080/01919512.2022.2106185","url":null,"abstract":"ABSTRACT Gum Arabic (GA) samples with 6% (w/v) concentration in water were ozonated for 5, 30, and 60 min, corresponding to 0.0030, 0.0125, and 0.0140 g consumed ozone/L, respectively. Ozonation steadily reduced the viscosity, flow, and consistency index of GA suspensions significantly (P < 0.05). Although no apparent changes were observed in the general chemical structure of GA samples, an increase in the absorbance of -OH bends was detected by FTIR analysis. DSC peak temperatures (292.0 ± 0.1 to 281.0 ± 0.9 °C) and pH values of samples (4.84 ± 0.13 to 2.90 ± 0.09) were decreased upon ozonation. Small but statistically significant differences (P < 0.05) were obtained for water solubility and water absorption index of samples after ozonation. Phenolic compounds and radical scavenging activities in GA were increased significantly (P < 0.05) by ozonation. Ozonation, which is an environmental-friendly unit operation, would offer valuable contributions to relevant industries with improved properties of GA.","PeriodicalId":19580,"journal":{"name":"Ozone: Science & Engineering","volume":"GE-22 1","pages":"333 - 345"},"PeriodicalIF":2.7,"publicationDate":"2022-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84614819","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 : 2022-06-26DOI: 10.1080/01919512.2022.2091512
Ionatan Anton Schroer, Janice da Silva, Bethânia Brochier, P. R. S. da Silva, Suse Botelho da Silva, Éverton Hansen
ABSTRACT The COVID-19 pandemic has demonstrated the demand for more effective procedures for sanitizing environments, especially high-risk ones, such as hospitals. Several products are used as disinfectants, with ozone being one of the strongest oxidants known. High relative humidity helps reduce the contact time required for viruses and bacteria inactivation with ozone. Thus, this work aimed to analyze the dispersion of an ozonized mist by CFD simulation to sanitize a hospital operating room. To our best knowledge, for the first time, the dispersion of an ozonized mist was investigated by CFD. The mathematical and numerical models were validated with results from the literature. The decay kinetics of the ozonized mist was obtained experimentally, resulting in a first order reaction with a kinetic constant of 2.66 × 10−4 s−1. The numerical results of concentration on the surfaces were analyzed qualitatively and quantitatively, providing relevant information about the fluid dynamics of the sanitizing process. Ozone mist concentrations were higher on the walls close to the generator and lower on the furthest walls and the ceiling. The ozone mist concentration in the room reached an average of 11 mg/L. Five minutes of ozone mist generation and another five minutes of decay by air circulation were sufficient to provide an increase in ozone mist to concentrations above 4 mg/L, considered satisfactory for the sanitization of the operating room surfaces.
{"title":"Study of ozone misting for sanitization of hospital facilities: A CFD approach","authors":"Ionatan Anton Schroer, Janice da Silva, Bethânia Brochier, P. R. S. da Silva, Suse Botelho da Silva, Éverton Hansen","doi":"10.1080/01919512.2022.2091512","DOIUrl":"https://doi.org/10.1080/01919512.2022.2091512","url":null,"abstract":"ABSTRACT The COVID-19 pandemic has demonstrated the demand for more effective procedures for sanitizing environments, especially high-risk ones, such as hospitals. Several products are used as disinfectants, with ozone being one of the strongest oxidants known. High relative humidity helps reduce the contact time required for viruses and bacteria inactivation with ozone. Thus, this work aimed to analyze the dispersion of an ozonized mist by CFD simulation to sanitize a hospital operating room. To our best knowledge, for the first time, the dispersion of an ozonized mist was investigated by CFD. The mathematical and numerical models were validated with results from the literature. The decay kinetics of the ozonized mist was obtained experimentally, resulting in a first order reaction with a kinetic constant of 2.66 × 10−4 s−1. The numerical results of concentration on the surfaces were analyzed qualitatively and quantitatively, providing relevant information about the fluid dynamics of the sanitizing process. Ozone mist concentrations were higher on the walls close to the generator and lower on the furthest walls and the ceiling. The ozone mist concentration in the room reached an average of 11 mg/L. Five minutes of ozone mist generation and another five minutes of decay by air circulation were sufficient to provide an increase in ozone mist to concentrations above 4 mg/L, considered satisfactory for the sanitization of the operating room surfaces.","PeriodicalId":19580,"journal":{"name":"Ozone: Science & Engineering","volume":"4 1","pages":"305 - 319"},"PeriodicalIF":2.7,"publicationDate":"2022-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83129952","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 : 2022-06-21DOI: 10.1080/01919512.2022.2091511
N. Pavan, Juliano Passaretti Filho, Guilherme Isquibola, F. Caires, V. Ximenes
ABSTRACT The applications of ozonized oils in human medicine, veterinary, and dentistry have been experiencing a significant increase in the last years. An important chemical property of ozonized oils is their oxidizing capacity, which is directly related to the therapeutical effects. This work aimed to study the light emission caused by the oxidation of luminol by ozonized sesame oil. Sesame oil was ozonized at different time intervals and characterized by peroxide index, Fourier-transform infrared spectroscopy, and thermal analysis. The light emission efficiency was correlated with the pH of the medium, the concentration of horseradish peroxidase (HRP), used as a catalyst, and solvents. A linear correlation was obtained between the concentration of ozonized oil and the integrated light emission. In a second approach, taurine chloramine (Tau-NHCl) was used instead of HRP. The light emission was dependent on both ozonized oil and Tau-NHCl, showing the involvement of intermediate oxidative species in the reaction. Considering the growing therapeutic applications of ozonized oils and Tau-NHCl, these findings instigate further biological investigations to characterize additive or synergic microbicidal properties.
{"title":"Chemiluminescence from Ozonized Sesame Oil","authors":"N. Pavan, Juliano Passaretti Filho, Guilherme Isquibola, F. Caires, V. Ximenes","doi":"10.1080/01919512.2022.2091511","DOIUrl":"https://doi.org/10.1080/01919512.2022.2091511","url":null,"abstract":"ABSTRACT The applications of ozonized oils in human medicine, veterinary, and dentistry have been experiencing a significant increase in the last years. An important chemical property of ozonized oils is their oxidizing capacity, which is directly related to the therapeutical effects. This work aimed to study the light emission caused by the oxidation of luminol by ozonized sesame oil. Sesame oil was ozonized at different time intervals and characterized by peroxide index, Fourier-transform infrared spectroscopy, and thermal analysis. The light emission efficiency was correlated with the pH of the medium, the concentration of horseradish peroxidase (HRP), used as a catalyst, and solvents. A linear correlation was obtained between the concentration of ozonized oil and the integrated light emission. In a second approach, taurine chloramine (Tau-NHCl) was used instead of HRP. The light emission was dependent on both ozonized oil and Tau-NHCl, showing the involvement of intermediate oxidative species in the reaction. Considering the growing therapeutic applications of ozonized oils and Tau-NHCl, these findings instigate further biological investigations to characterize additive or synergic microbicidal properties.","PeriodicalId":19580,"journal":{"name":"Ozone: Science & Engineering","volume":"17 1","pages":"320 - 332"},"PeriodicalIF":2.7,"publicationDate":"2022-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87176208","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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