Pub Date : 2025-01-01DOI: 10.1016/j.jcou.2024.103003
Stefania Mottola , Gianluca Viscusi , Gianmaria Oliva , Giovanni Vigliotta , Stefano Cardea , Giuliana Gorrasi , Iolanda De Marco
In this work, pectin aerogels loaded with zinc oxide (ZnO) were produced for a possible application in food packaging. Using a green synthesis procedure, ZnO nanoparticles were obtained via beetroot extract as a reducing, capping, and stabilizing agent; the obtained ZnO particles, with an average size of 300 nm, were loaded into pectin/alginate-based aerogels. Supercritical drying was used to produce the biopolymers-based aerogels, which were initially formulated with different polymer concentrations (2 wt% and 4 wt%) and various ratios between pectin and alginate (9:1, 7:3, 1:1) to identify the optimal configuration that would guarantee a balance between strength and morphology, resulting in better properties in the final structure. The aerogels enriched with different ZnO percentages (5 %, 10 %, and 15 %) were later produced. The aerogels showed a porous structure with uniform pore size distribution, influenced by the ZnO loading. The liquids’ absorption test of the samples assessed that higher concentrations of ZnO could reduce the available surface area, limiting the aerogels’ absorption capacity. The potent antimicrobial activity of ZnO and pectin/alginate aerogels against the non-pathogenic Escherichia coli and the pathogenic Staphylococcus aureus strains was demonstrated using a minimum lethal dose, highlighting the possibility of employing such materials in food packaging.
{"title":"Pectin/alginate aerogel containing ZnO produced from beetroot extract mediated green synthesis for potential applications in food packaging","authors":"Stefania Mottola , Gianluca Viscusi , Gianmaria Oliva , Giovanni Vigliotta , Stefano Cardea , Giuliana Gorrasi , Iolanda De Marco","doi":"10.1016/j.jcou.2024.103003","DOIUrl":"10.1016/j.jcou.2024.103003","url":null,"abstract":"<div><div>In this work, pectin aerogels loaded with zinc oxide (ZnO) were produced for a possible application in food packaging. Using a green synthesis procedure, ZnO nanoparticles were obtained via beetroot extract as a reducing, capping, and stabilizing agent; the obtained ZnO particles, with an average size of 300 nm, were loaded into pectin/alginate-based aerogels. Supercritical drying was used to produce the biopolymers-based aerogels, which were initially formulated with different polymer concentrations (2 wt% and 4 wt%) and various ratios between pectin and alginate (9:1, 7:3, 1:1) to identify the optimal configuration that would guarantee a balance between strength and morphology, resulting in better properties in the final structure. The aerogels enriched with different ZnO percentages (5 %, 10 %, and 15 %) were later produced. The aerogels showed a porous structure with uniform pore size distribution, influenced by the ZnO loading. The liquids’ absorption test of the samples assessed that higher concentrations of ZnO could reduce the available surface area, limiting the aerogels’ absorption capacity. The potent antimicrobial activity of ZnO and pectin/alginate aerogels against the non-pathogenic <em>Escherichia coli</em> and the pathogenic <em>Staphylococcus aureus</em> strains was demonstrated using a minimum lethal dose, highlighting the possibility of employing such materials in food packaging.</div></div>","PeriodicalId":350,"journal":{"name":"Journal of CO2 Utilization","volume":"91 ","pages":"Article 103003"},"PeriodicalIF":7.2,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143177103","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
In order to micro and Nano sizing a drug via supercritical fluid technology, it is necessary to obtain its solubility in various ranges of pressures and temperatures. For this purpose, solubility of Niclosamide piperazine, in supercritical carbon dioxide (SC-CO2) was measured by a new static method, for the first time. The measurements were performed at various circumstances, i.e. temperatures = 308, 318, 328 and 338 K and pressures = 12–27 MPa. The obtained results indicate that pressure significantly influences the solubility of Niclosamide piperazine, with a measured solubility ranging from 0.77 × 10−7 to 13.60 × 10−7 in mole fraction. To study theoretically the solubility of Niclosamide piperazine, the obtained results are modeled using nine semi-empirical equations i.e. Garlapati-Madras, Chrastil, Kumar-Johnston, Sodeifian et al. (models I-II), Bartle et al., Bian et al., Sung-Shim, Mendez-Santiago-Teja and Peng-Robinson EoS with van der Waals mixing rule. Among which the Bian et al., model and Peng-Robinson EoS showed the minimum AARD% of about 4.45 % (corresponding corrected Akaike Information Criterion is −704.09) and 7.54 % (corresponding corrected Akaike Information Criterion is −699.24), respectively. Finally, enthalpies for the binary mixture of Niclosamide piperazine-supercritical carbon dioxide binary system has been determined, for the first time.
{"title":"Niclosamide piperazine solubility in supercritical CO2 green solvent: A comprehensive experimental and modeling investigation","authors":"Gholamhossein Sodeifian , Hamidreza Bagheri , Farnoush Masihpour , Negar Rajaei , Maryam Arbab Nooshabadi","doi":"10.1016/j.jcou.2024.102995","DOIUrl":"10.1016/j.jcou.2024.102995","url":null,"abstract":"<div><div>In order to micro and Nano sizing a drug via supercritical fluid technology, it is necessary to obtain its solubility in various ranges of pressures and temperatures. For this purpose, solubility of <em>Niclosamide piperazine</em>, in supercritical carbon dioxide (SC-CO<sub>2</sub>) was measured by a new static method, for the first time. The measurements were performed at various circumstances, i.e. temperatures = 308, 318, 328 and 338 K and pressures = 12–27 MPa. The obtained results indicate that pressure significantly influences the solubility of <em>Niclosamide piperazine</em>, with a measured solubility ranging from 0.77 × 10<sup>−7</sup> to 13.60 × 10<sup>−7</sup> in mole fraction. To study theoretically the solubility of <em>Niclosamide piperazine</em>, the obtained results are modeled using nine semi-empirical equations i.e. Garlapati-Madras, Chrastil, Kumar-Johnston, Sodeifian et al. (models I-II), Bartle et al., Bian et al., Sung-Shim, Mendez-Santiago-Teja and Peng-Robinson EoS with van der Waals mixing rule. Among which the Bian et al., model and Peng-Robinson EoS showed the minimum AARD% of about 4.45 % (corresponding corrected Akaike Information Criterion is −704.09) and 7.54 % (corresponding corrected Akaike Information Criterion is −699.24), respectively. Finally, enthalpies for the binary mixture of <em>Niclosamide piperazine</em>-supercritical carbon dioxide binary system has been determined, for the first time.</div></div>","PeriodicalId":350,"journal":{"name":"Journal of CO2 Utilization","volume":"91 ","pages":"Article 102995"},"PeriodicalIF":7.2,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143177101","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-01-01DOI: 10.1016/j.jcou.2024.103016
Diana Murillo-Criado , Fernando Aguilar-Galindo , Isabel Serrano , Miguel A. Gonzalez , Emilia Tojo , Inmaculada Suárez , Baudilio Coto , Maria Jose Tenorio
The reduction of atmospheric carbon dioxide (CO₂) levels is contingent upon the implementation of strategies such as the curtailment of fossil fuel usage, the adoption of renewable energy sources, and the utilization of CO₂ capture and utilization technologies. Although direct air capture (DAC) presents a significant opportunity for global mitigation, industrial efforts have primarily concentrated on pre-combustion, oxyfuel, and post-combustion capture methods to enhance environmental sustainability. Nevertheless, the economic viability of CO₂ reuse remains a significant concern, and the development of innovative solutions is imperative. In this study, the influence of the carboxylate anion on CO2 absorption process using imidazolium-derived ionic liquids (ILs) is compared. 1-Butyl-3-methylimidazolium formate ([BMIm][HCOO]), 1-butyl-3-methylimidazolium acetate ([BMIm][OAc]), and 1-butyl-3-methylimidazolium propionate ([BMIm][C3H5OO]) have been analyzed. The efficacy of the capture process was assessed by quantifying the formation of an IL-CO₂ adduct using nuclear magnetic resonance (NMR) and attenuated total reflection infrared spectroscopy (ATR-IR). Furthermore, this work studies, using Density Functional Theory (DFT) and COSMO modelling, the difference in the spontaneity of the proton transfer from the cation [BMIm]+ to the carboxylate anions of the ionic liquids used in CO2 absorption process. Based on experimental and modelling data, [BMIm][OAc] was identified as the optimal IL candidate, presents a CO2 molar fraction absorbed at 30 °C and 1 bar of 0.203, compared to 0.083 for [BMIm][HCOO] and 0.190 for [BMIm][C3H5OO]. Moreover, theoretical simulations support these results with the calculation of the acid deprotonation equilibrium constants with the highest value being obtained for [BMIm][OAc].
{"title":"Influence of the carboxylate anion on the CO2 absorption mechanism using based-imidazolium ionic liquids","authors":"Diana Murillo-Criado , Fernando Aguilar-Galindo , Isabel Serrano , Miguel A. Gonzalez , Emilia Tojo , Inmaculada Suárez , Baudilio Coto , Maria Jose Tenorio","doi":"10.1016/j.jcou.2024.103016","DOIUrl":"10.1016/j.jcou.2024.103016","url":null,"abstract":"<div><div>The reduction of atmospheric carbon dioxide (CO₂) levels is contingent upon the implementation of strategies such as the curtailment of fossil fuel usage, the adoption of renewable energy sources, and the utilization of CO₂ capture and utilization technologies. Although direct air capture (DAC) presents a significant opportunity for global mitigation, industrial efforts have primarily concentrated on pre-combustion, oxyfuel, and post-combustion capture methods to enhance environmental sustainability. Nevertheless, the economic viability of CO₂ reuse remains a significant concern, and the development of innovative solutions is imperative. In this study, the influence of the carboxylate anion on CO<sub>2</sub> absorption process using imidazolium-derived ionic liquids (ILs) is compared. 1-Butyl-3-methylimidazolium formate ([BMIm][HCOO]), 1-butyl-3-methylimidazolium acetate ([BMIm][OAc]), and 1-butyl-3-methylimidazolium propionate ([BMIm][C<sub>3</sub>H<sub>5</sub>OO]) have been analyzed. The efficacy of the capture process was assessed by quantifying the formation of an IL-CO₂ adduct using nuclear magnetic resonance (NMR) and attenuated total reflection infrared spectroscopy (ATR-IR). Furthermore, this work studies, using Density Functional Theory (DFT) and COSMO modelling, the difference in the spontaneity of the proton transfer from the cation [BMIm]<sup>+</sup> to the carboxylate anions of the ionic liquids used in CO<sub>2</sub> absorption process. Based on experimental and modelling data, [BMIm][OAc] was identified as the optimal IL candidate, presents a CO<sub>2</sub> molar fraction absorbed at 30 °C and 1 bar of 0.203, compared to 0.083 for [BMIm][HCOO] and 0.190 for [BMIm][C<sub>3</sub>H<sub>5</sub>OO]. Moreover, theoretical simulations support these results with the calculation of the acid deprotonation equilibrium constants with the highest value being obtained for [BMIm][OAc].</div></div>","PeriodicalId":350,"journal":{"name":"Journal of CO2 Utilization","volume":"91 ","pages":"Article 103016"},"PeriodicalIF":7.2,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143176989","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-01-01DOI: 10.1016/j.jcou.2024.103011
Sara Payamifar, Ahmad Poursattar Marjani
Carbon fixation is a vital chemical and biological methodology where carbon dioxide (CO2) from the environment is altered into organic materials. This process creates the basis of the carbon cycle. It plays a significant role in maintaining Earth’s life and adjusting its climate. Cyclic carbonates are best known as multipurpose compounds and have broad utility in pharmaceutical construction and producing multiple fine chemicals. The cycloaddition of CO2 and epoxide to create cyclic carbonates is regarded as one of the most hopeful CO2 transformations due to its completely non-toxicity, economical, and much atomic economy technical routes for the employment of CO2. However, utilizing the highly chemically stable CO2 requires high bond cleavage energy of the CO bond. Therefore, it is crucial to design and develop appropriate catalysts for the chemical fixation of CO2. Recently, employing β-cyclodextrin (β-CD) as a catalyst has dramatically improved due to unique properties like low-price, available, non-toxic, stable, biodegradable, renewable, green, eco-friendly, and the ability to create inclusion complexes. This investigation studies the preparation of cyclic carbonates utilizing a β-CD-based catalyst system via CO2 molecular, which profoundly analyzes the research advancement of recent years. This review helps scientists to use contemporary improvements and, therefore, may furnish several beneficial visions for future studies on the construction of cyclic carbonates utilizing CO2 as the feedstock. It will deliver a helpful reference and directory for researchers to progress better.
{"title":"A review of β-cyclodextrin-based catalysts system in the chemical fixation of carbon dioxide","authors":"Sara Payamifar, Ahmad Poursattar Marjani","doi":"10.1016/j.jcou.2024.103011","DOIUrl":"10.1016/j.jcou.2024.103011","url":null,"abstract":"<div><div>Carbon fixation is a vital chemical and biological methodology where carbon dioxide (CO<sub>2</sub>) from the environment is altered into organic materials. This process creates the basis of the carbon cycle. It plays a significant role in maintaining Earth’s life and adjusting its climate. Cyclic carbonates are best known as multipurpose compounds and have broad utility in pharmaceutical construction and producing multiple fine chemicals. The cycloaddition of CO<sub>2</sub> and epoxide to create cyclic carbonates is regarded as one of the most hopeful CO<sub>2</sub> transformations due to its completely non-toxicity, economical, and much atomic economy technical routes for the employment of CO<sub>2</sub>. However, utilizing the highly chemically stable CO<sub>2</sub> requires high bond cleavage energy of the C<img>O bond. Therefore, it is crucial to design and develop appropriate catalysts for the chemical fixation of CO<sub>2</sub>. Recently, employing β-cyclodextrin (β-CD) as a catalyst has dramatically improved due to unique properties like low-price, available, non-toxic, stable, biodegradable, renewable, green, eco-friendly, and the ability to create inclusion complexes. This investigation studies the preparation of cyclic carbonates utilizing a β-CD-based catalyst system via CO<sub>2</sub> molecular, which profoundly analyzes the research advancement of recent years. This review helps scientists to use contemporary improvements and, therefore, may furnish several beneficial visions for future studies on the construction of cyclic carbonates utilizing CO<sub>2</sub> as the feedstock. It will deliver a helpful reference and directory for researchers to progress better.</div></div>","PeriodicalId":350,"journal":{"name":"Journal of CO2 Utilization","volume":"91 ","pages":"Article 103011"},"PeriodicalIF":7.2,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143177100","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-01-01DOI: 10.1016/j.jcou.2024.103007
Taja Žitek Makoter , Petra Kotnik , Teo Makoter , Željko Knez , Maša Knez Marevci
Cannabinoids are the main active ingredients of Cannabis sativa L., obtained by a suitable extraction method and decarboxylation, in which the acid forms of the cannabinoids are converted into active forms. Supercritical CO2 extraction method and decarboxylation process were optimized for 7 cannabinoids (CBD, CBDA, THC, THCA, CBGA, CBN and CBC). The optimal extraction conditions for all cannabinoids were determined at a temperature of 60 °C and a pressure of 300 bar to 550 bar. At higher temperatures and reaction times, a significant depletion of neutral cannabinoids was observed. The optimal conditions of the decarboxylation process varied depending on the component. For the CBD component, which could be measured in the highest concentrations (560 mg/g), the optimal conditions were 140 °C and 10 min. The study can be an important model for predicting the behavior of cannabinoids under certain parameters.
{"title":"Optimization of the supercritical extraction and decarboxylation process of industrial hemp","authors":"Taja Žitek Makoter , Petra Kotnik , Teo Makoter , Željko Knez , Maša Knez Marevci","doi":"10.1016/j.jcou.2024.103007","DOIUrl":"10.1016/j.jcou.2024.103007","url":null,"abstract":"<div><div>Cannabinoids are the main active ingredients of <em>Cannabis sativa</em> L., obtained by a suitable extraction method and decarboxylation, in which the acid forms of the cannabinoids are converted into active forms. Supercritical CO<sub>2</sub> extraction method and decarboxylation process were optimized for 7 cannabinoids (CBD, CBDA, THC, THCA, CBGA, CBN and CBC). The optimal extraction conditions for all cannabinoids were determined at a temperature of 60 °C and a pressure of 300 bar to 550 bar. At higher temperatures and reaction times, a significant depletion of neutral cannabinoids was observed. The optimal conditions of the decarboxylation process varied depending on the component. For the CBD component, which could be measured in the highest concentrations (560 mg/g), the optimal conditions were 140 °C and 10 min. The study can be an important model for predicting the behavior of cannabinoids under certain parameters.</div></div>","PeriodicalId":350,"journal":{"name":"Journal of CO2 Utilization","volume":"91 ","pages":"Article 103007"},"PeriodicalIF":7.2,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143177109","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-01-01DOI: 10.1016/j.jcou.2024.103015
Jianwei Sun , Yuehao Guo , Yan Meng , Ruiquan Jia , Jiajie Zhou , Hongyuan Gao , Jie Liu
Alkali-activated steel slag material (ASSM), a sustainable and environmentally-friendly construction material due to its lower carbon footprint. faces challenges, particularly in terms of high shrinkage. This study investigated the relationship between autogenous shrinkage, drying shrinkage, the type and content of hydration products, and pore structure of ASSM. The effects of different silicate moduli of water glass (1.5 and 2.0) and GBFS contents (10 % and 20 %) on the properties of ASSM were evaluated with a constant alkali concentration of 4 %. The results indicate that both the silicate modulus and GBFS content significantly impact the shrinkage behavior of ASSM. Decreasing the silicate modulus and increasing the GBFS content effectively reduce both autogenous and drying shrinkages. Notably, autogenous shrinkage is reduced more significantly with an increase in GBFS content at a low modulus, while drying shrinkage is reduced more noticeably under high modulus condition. The established shrinkage models can effectively predict autogenous and drying shrinkages of ASSM. The trend of drying shrinkage in ASSM corresponds to changes in the pore structure, whereas the varying trends in autogenous shrinkage may be attributed to the formation of gel products. Increasing the silicate modulus and GBFS content does not alter the types of hydration products. An increase in the silicate modulus and GBFS content has minimal effect on the hydration degree of ASSM. By increasing both the silicate modulus and GBFS content, the pore structure of the hardened paste can be refined.
{"title":"Effects of silicate modulus and GBFS content on shrinkage of alkali-activated steel slag cementitious material","authors":"Jianwei Sun , Yuehao Guo , Yan Meng , Ruiquan Jia , Jiajie Zhou , Hongyuan Gao , Jie Liu","doi":"10.1016/j.jcou.2024.103015","DOIUrl":"10.1016/j.jcou.2024.103015","url":null,"abstract":"<div><div>Alkali-activated steel slag material (ASSM), a sustainable and environmentally-friendly construction material due to its lower carbon footprint. faces challenges, particularly in terms of high shrinkage. This study investigated the relationship between autogenous shrinkage, drying shrinkage, the type and content of hydration products, and pore structure of ASSM. The effects of different silicate moduli of water glass (1.5 and 2.0) and GBFS contents (10 % and 20 %) on the properties of ASSM were evaluated with a constant alkali concentration of 4 %. The results indicate that both the silicate modulus and GBFS content significantly impact the shrinkage behavior of ASSM. Decreasing the silicate modulus and increasing the GBFS content effectively reduce both autogenous and drying shrinkages. Notably, autogenous shrinkage is reduced more significantly with an increase in GBFS content at a low modulus, while drying shrinkage is reduced more noticeably under high modulus condition. The established shrinkage models can effectively predict autogenous and drying shrinkages of ASSM. The trend of drying shrinkage in ASSM corresponds to changes in the pore structure, whereas the varying trends in autogenous shrinkage may be attributed to the formation of gel products. Increasing the silicate modulus and GBFS content does not alter the types of hydration products. An increase in the silicate modulus and GBFS content has minimal effect on the hydration degree of ASSM. By increasing both the silicate modulus and GBFS content, the pore structure of the hardened paste can be refined.</div></div>","PeriodicalId":350,"journal":{"name":"Journal of CO2 Utilization","volume":"91 ","pages":"Article 103015"},"PeriodicalIF":7.2,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143178103","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-01-01DOI: 10.1016/j.jcou.2024.103009
Ying Su , Yelin Qian , Ming Sun , Changchun Li , Chunmei Liu , Dan Zhang , Xiaodong Zhang , Jun Yang , Yan Zhao , Rui Tao , Fengxia Xu
{"title":"Corrigendum to “The effects of curing conditions on the performance and carbon dioxide emissions of fly ash-magnesium phosphate cement repair materials for pavement maintenance” [J. CO2 Util. 90 (2024) 102998]","authors":"Ying Su , Yelin Qian , Ming Sun , Changchun Li , Chunmei Liu , Dan Zhang , Xiaodong Zhang , Jun Yang , Yan Zhao , Rui Tao , Fengxia Xu","doi":"10.1016/j.jcou.2024.103009","DOIUrl":"10.1016/j.jcou.2024.103009","url":null,"abstract":"","PeriodicalId":350,"journal":{"name":"Journal of CO2 Utilization","volume":"91 ","pages":"Article 103009"},"PeriodicalIF":7.2,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143176990","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-01-01DOI: 10.1016/j.jcou.2024.103008
Hana Kmentová , Miroslava Filip Edelmannová , Zdeněk Baďura , Radek Zbořil , Lucie Obalová , Štěpán Kment , Kamila Kočí
This study explores the effects of various structural dopants on TiO₂ to enhance selectivity of reaction products in photocatalytic CO₂ reduction. Specifically, the impacts of nitrogen doping, platinum surface doping, and self-doping with Ti³ ⁺ ions (via oxygen vacancies in reduced TiO₂-x) were investigated. X-ray diffraction confirmed the anatase phase, with crystal sizes ranging from 24 to 27 nm. High-resolution transmission electron microscopy revealed uniformly distributed active sites on platinum-doped TiO₂ surfaces. Nitrogen doping selectively stabilized oxygen vacancies, enhancing CO production, while platinum loading acted as an electron trap, improving charge separation and promoting the deeper reduction of CO₂ to CH₄. Self-doping with Ti³ ⁺ ions introduced structural defects that further influenced photocatalytic dynamics. X-ray photoelectron spectroscopy and electron paramagnetic resonance analyses demonstrated how these dopants reorganize surface defects, thereby fine-tuning product selectivity. Variations in dopant-to-oxygen ratios and smaller crystallites led to different yields of CO and CH₄, emphasizing the importance of dopant type and distribution. Stability tests confirmed consistent photocatalytic activity across multiple cycles, highlighting the robustness and reusability of the modified materials. This study provides valuable insights into the interplay between dopants, crystal structure, and photocatalytic performance, offering new directions for the design of tailored catalysts for selective CO₂ reduction.
{"title":"Tuning CO2 reduction selectivity via structural doping of TiO2 photocatalysts","authors":"Hana Kmentová , Miroslava Filip Edelmannová , Zdeněk Baďura , Radek Zbořil , Lucie Obalová , Štěpán Kment , Kamila Kočí","doi":"10.1016/j.jcou.2024.103008","DOIUrl":"10.1016/j.jcou.2024.103008","url":null,"abstract":"<div><div>This study explores the effects of various structural dopants on TiO₂ to enhance selectivity of reaction products in photocatalytic CO₂ reduction. Specifically, the impacts of nitrogen doping, platinum surface doping, and self-doping with Ti³ ⁺ ions (via oxygen vacancies in reduced TiO₂-x) were investigated. X-ray diffraction confirmed the anatase phase, with crystal sizes ranging from 24 to 27 nm. High-resolution transmission electron microscopy revealed uniformly distributed active sites on platinum-doped TiO₂ surfaces. Nitrogen doping selectively stabilized oxygen vacancies, enhancing CO production, while platinum loading acted as an electron trap, improving charge separation and promoting the deeper reduction of CO₂ to CH₄. Self-doping with Ti³ ⁺ ions introduced structural defects that further influenced photocatalytic dynamics. X-ray photoelectron spectroscopy and electron paramagnetic resonance analyses demonstrated how these dopants reorganize surface defects, thereby fine-tuning product selectivity. Variations in dopant-to-oxygen ratios and smaller crystallites led to different yields of CO and CH₄, emphasizing the importance of dopant type and distribution. Stability tests confirmed consistent photocatalytic activity across multiple cycles, highlighting the robustness and reusability of the modified materials. This study provides valuable insights into the interplay between dopants, crystal structure, and photocatalytic performance, offering new directions for the design of tailored catalysts for selective CO₂ reduction.</div></div>","PeriodicalId":350,"journal":{"name":"Journal of CO2 Utilization","volume":"91 ","pages":"Article 103008"},"PeriodicalIF":7.2,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143176986","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-01-01DOI: 10.1016/j.jcou.2024.103012
Amirali Salehi , Mohammadreza Omidkhah , Abtin Ebadi Amooghin , Mohammad Mehdi Moftakhari Sharifzadeh
In recent membrane research, the search for physicochemically stable membranes with exceptional separation properties surpassing the Robson upper limit has attracted considerable attention. For this purpose, the use of polymer blending and mixed matrix membranes (MMMs) has shown promise in improving membrane performance. In this study, we fabricated a blend membrane by incorporating Poly (5 amino-1-(4 aminophenyl)-1,3-trimethyl indane) (Matrimid@5218) into the poly(methyl methacrylate) (PMMA) polymer matrix to harness the positive properties of Matrimid, such as high mechanical strength and thermal stability, along with the suitable permeability and selectivity of PMMA. Subsequently, graphene oxide (GO) was embedded into this blend membrane to explore the gas separation properties of these new MMMs, focusing on He/N2, He/CH4, CO2/N2, and CO2/CH4 separations. After identifying the optimal polymer blend composition, gas permeation experiments were conducted on MMMs with varying filler loadings at different pressures (2–10 bar) and temperature (35 ºC). Comprehensive characterization techniques, including FTIR, DSC, TGA, SEM, XRD, and tensile testing, were employed to assess the prepared membranes. The results revealed that PMMA/10 %Matrimid/1 %GO exhibited the highest performance for He/N2 and He/CH4 separations. Notably, the He permeability increased from 12.83 Barrer for the pure PMMA membrane to 21.19 Barrer in PMMA/10 %Matrimid/1 %GO (about 65 %). Also, He/N2 and He/CH4 selectivities of PMMA/10 %Matrimid/1 %GO reached 857.9 and 1033.66. On the other hand, PMMA/10 %Matrimid/2 %GO emerged as the optimal MMM for CO2/N2 and CO2/CH4 separation. This MMM exhibited CO2 permeability, CO2/N2, and CO2/CH4 selectivities of 14.23 Barrer, 729.74, and 862.42, respectively. Comparing these results to the pure PMMA membrane with CO2 permeability of 1.08 Barrer, CO2/N2 selectivity of 31.76, and CO2/CH4 selectivity of 83.07, PMMA/Matrimid/GO MMM series were good candidates for further investigation in industrial gas separations.
{"title":"Improved gas separation performance of PMMA/Matrimid@5218/graphene oxide (GO) mixed matrix membranes","authors":"Amirali Salehi , Mohammadreza Omidkhah , Abtin Ebadi Amooghin , Mohammad Mehdi Moftakhari Sharifzadeh","doi":"10.1016/j.jcou.2024.103012","DOIUrl":"10.1016/j.jcou.2024.103012","url":null,"abstract":"<div><div>In recent membrane research, the search for physicochemically stable membranes with exceptional separation properties surpassing the Robson upper limit has attracted considerable attention. For this purpose, the use of polymer blending and mixed matrix membranes (MMMs) has shown promise in improving membrane performance. In this study, we fabricated a blend membrane by incorporating Poly (5 amino-1-(4 aminophenyl)-1,3-trimethyl indane) (Matrimid<sup>@</sup>5218) into the poly(methyl methacrylate) (PMMA) polymer matrix to harness the positive properties of Matrimid, such as high mechanical strength and thermal stability, along with the suitable permeability and selectivity of PMMA. Subsequently, graphene oxide (GO) was embedded into this blend membrane to explore the gas separation properties of these new MMMs, focusing on He/N<sub>2</sub>, He/CH<sub>4</sub>, CO<sub>2</sub>/N<sub>2</sub>, and CO<sub>2</sub>/CH<sub>4</sub> separations. After identifying the optimal polymer blend composition, gas permeation experiments were conducted on MMMs with varying filler loadings at different pressures (2–10 bar) and temperature (35 ºC). Comprehensive characterization techniques, including FTIR, DSC, TGA, SEM, XRD, and tensile testing, were employed to assess the prepared membranes. The results revealed that PMMA/10 %Matrimid/1 %GO exhibited the highest performance for He/N<sub>2</sub> and He/CH<sub>4</sub> separations. Notably, the He permeability increased from 12.83 Barrer for the pure PMMA membrane to 21.19 Barrer in PMMA/10 %Matrimid/1 %GO (about 65 %). Also, He/N<sub>2</sub> and He/CH<sub>4</sub> selectivities of PMMA/10 %Matrimid/1 %GO reached 857.9 and 1033.66. On the other hand, PMMA/10 %Matrimid/2 %GO emerged as the optimal MMM for CO<sub>2</sub>/N<sub>2</sub> and CO<sub>2</sub>/CH<sub>4</sub> separation. This MMM exhibited CO<sub>2</sub> permeability, CO<sub>2</sub>/N<sub>2</sub>, and CO<sub>2</sub>/CH<sub>4</sub> selectivities of 14.23 Barrer, 729.74, and 862.42, respectively. Comparing these results to the pure PMMA membrane with CO<sub>2</sub> permeability of 1.08 Barrer, CO<sub>2</sub>/N<sub>2</sub> selectivity of 31.76, and CO<sub>2</sub>/CH<sub>4</sub> selectivity of 83.07, PMMA/Matrimid/GO MMM series were good candidates for further investigation in industrial gas separations.</div></div>","PeriodicalId":350,"journal":{"name":"Journal of CO2 Utilization","volume":"91 ","pages":"Article 103012"},"PeriodicalIF":7.2,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143176988","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
CO2, a promising C1 resource, can be permanently fixed in polymers, making it abundant and non-toxic. The development of CO2-based polymers, such as rubbers and plastics, for mainstream industrial applications, could significantly reduce CO2 concentration in the atmosphere and decrease the reliance on fossil resources. Notably, polyether carbonate polyols (PECP) and polycarbonate polyols (PCP) are key CO2-based polyols that can be produced by the reaction of CO2 with epoxides in the presence of a catalyst. These polyols are instrumental in creating carbon-neutral polyurethane foam (PUF). This innovative synthesis method offers numerous advantages over the conventional polycondensation of diisocyanate and polyols method. The use of CO2-based polyols for PUF production is a prime example of CO2 utilization with substantial industrial potential. This review delves into recent advancements in preparing PUF using both isocyanate and non-isocyanate methods with CO2-based polyols, and cyclic carbonates, respectively. PUF, a vital member of the polymer family, boasts a wide range of applications, presenting a significant opportunity to integrate CO2 into existing processes and products, thereby contributing to environmental sustainability.
{"title":"Carbon dioxide utilization: CO2-based polyurethane foam","authors":"Liselotte Karulf , Baljeet Singh , Rustam Singh , Timo Repo","doi":"10.1016/j.jcou.2024.103000","DOIUrl":"10.1016/j.jcou.2024.103000","url":null,"abstract":"<div><div>CO<sub>2</sub>, a promising C1 resource, can be permanently fixed in polymers, making it abundant and non-toxic. The development of CO<sub>2</sub>-based polymers, such as rubbers and plastics, for mainstream industrial applications, could significantly reduce CO<sub>2</sub> concentration in the atmosphere and decrease the reliance on fossil resources. Notably, polyether carbonate polyols (PECP) and polycarbonate polyols (PCP) are key CO<sub>2</sub>-based polyols that can be produced by the reaction of CO<sub>2</sub> with epoxides in the presence of a catalyst. These polyols are instrumental in creating carbon-neutral polyurethane foam (PUF). This innovative synthesis method offers numerous advantages over the conventional polycondensation of diisocyanate and polyols method. The use of CO<sub>2</sub>-based polyols for PUF production is a prime example of CO<sub>2</sub> utilization with substantial industrial potential. This review delves into recent advancements in preparing PUF using both isocyanate and non-isocyanate methods with CO<sub>2</sub>-based polyols, and cyclic carbonates, respectively. PUF, a vital member of the polymer family, boasts a wide range of applications, presenting a significant opportunity to integrate CO<sub>2</sub> into existing processes and products, thereby contributing to environmental sustainability.</div></div>","PeriodicalId":350,"journal":{"name":"Journal of CO2 Utilization","volume":"91 ","pages":"Article 103000"},"PeriodicalIF":7.2,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143177099","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
扫码关注我们
求助内容：
应助结果提醒方式：
京公网安备 11010802042870号