Pub Date : 2023-01-02DOI: 10.1080/17518253.2022.2160215
H. Ait Ahsaine, A. BaQais
ABSTRACT Electrochemical CO2 reduction reaction (CO2RR) into useful by products have received great and remarkable attention due to its promising route to mitigate the potential challenges regarding large CO2 emissions in the atmosphere. This technology will lead to recycle CO2 and achieve a carbon-neutral economy. This review summarizes the timeline of using metal and metal oxide catalysts and the latest developments CO2RR electrocatalysts, with a focus on systems producing C1 chemicals such as CO, HCOOH, CH4, and CH3OH. We first give a general introduction covering of the evolution of scientific production in the last two decades, the significance of this process, reaction mechanisms, catalyst evaluation criteria, and the broad spectrum of electrocatalysts. Some of the important contributions made to this field over the two past decades yielding the aforementioned C1 chemicals have then been reviewed. Finally, future directions and recommendations have been discussed to promote this technology to the industrial scale. GRAPHICAL ABSTRACT
{"title":"Metal and metal oxide electrocatalysts for the electrochemical reduction of CO2-to-C1 chemicals: are we there yet?","authors":"H. Ait Ahsaine, A. BaQais","doi":"10.1080/17518253.2022.2160215","DOIUrl":"https://doi.org/10.1080/17518253.2022.2160215","url":null,"abstract":"ABSTRACT Electrochemical CO2 reduction reaction (CO2RR) into useful by products have received great and remarkable attention due to its promising route to mitigate the potential challenges regarding large CO2 emissions in the atmosphere. This technology will lead to recycle CO2 and achieve a carbon-neutral economy. This review summarizes the timeline of using metal and metal oxide catalysts and the latest developments CO2RR electrocatalysts, with a focus on systems producing C1 chemicals such as CO, HCOOH, CH4, and CH3OH. We first give a general introduction covering of the evolution of scientific production in the last two decades, the significance of this process, reaction mechanisms, catalyst evaluation criteria, and the broad spectrum of electrocatalysts. Some of the important contributions made to this field over the two past decades yielding the aforementioned C1 chemicals have then been reviewed. Finally, future directions and recommendations have been discussed to promote this technology to the industrial scale. GRAPHICAL ABSTRACT","PeriodicalId":12768,"journal":{"name":"Green Chemistry Letters and Reviews","volume":null,"pages":null},"PeriodicalIF":6.6,"publicationDate":"2023-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86333045","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-01-02DOI: 10.1080/17518253.2022.2164472
A. Gallos, Océane Lannoy, S. Bellayer, G. Fontaine, S. Bourbigot, F. Allais
ABSTRACT A new class of biobased composites with tailorable mechanical properties made of natural fibers, polylactic acid, and ferulic acid derivatives (FAD) is studied. FAD was used to develop composites with elastomeric properties like improved elongation at break and highly reversible deformation upon elongation. Composites were prepared using raw and enzymatically treated hemp fibers. The fibers were defibrillated due to the enzymatic treatment increasing their aspect ratio. The composites were characterized by their mechanical properties and their reaction to fire. No significant change in the dispersion of the fibers in the composites was reported. Homogenously dispersed crystallites of FAD were observed by scanning electron microscopy in the PLA matrix and at the interface between the PLA and the fibers, where they are suspected to increase the free volume in correlation with a decrease in mechanical properties following the increase in the aspect ratio of the fibers. FAD also degraded the reaction to fire of the material with an increase in 10% of the peak of Heat Release Rate (pHRR) in comparison to neat PLA. It also increased the charring residue up to 3 wt.%. A synergistic effect between FAD and the lignin increasing the charring residue is also reported. GRAPHICAL ABSTRACT
{"title":"Fire testing and mechanical properties of neat and elastomeric polylactic acid composites reinforced with raw and enzymatically treated hemp fibers","authors":"A. Gallos, Océane Lannoy, S. Bellayer, G. Fontaine, S. Bourbigot, F. Allais","doi":"10.1080/17518253.2022.2164472","DOIUrl":"https://doi.org/10.1080/17518253.2022.2164472","url":null,"abstract":"ABSTRACT A new class of biobased composites with tailorable mechanical properties made of natural fibers, polylactic acid, and ferulic acid derivatives (FAD) is studied. FAD was used to develop composites with elastomeric properties like improved elongation at break and highly reversible deformation upon elongation. Composites were prepared using raw and enzymatically treated hemp fibers. The fibers were defibrillated due to the enzymatic treatment increasing their aspect ratio. The composites were characterized by their mechanical properties and their reaction to fire. No significant change in the dispersion of the fibers in the composites was reported. Homogenously dispersed crystallites of FAD were observed by scanning electron microscopy in the PLA matrix and at the interface between the PLA and the fibers, where they are suspected to increase the free volume in correlation with a decrease in mechanical properties following the increase in the aspect ratio of the fibers. FAD also degraded the reaction to fire of the material with an increase in 10% of the peak of Heat Release Rate (pHRR) in comparison to neat PLA. It also increased the charring residue up to 3 wt.%. A synergistic effect between FAD and the lignin increasing the charring residue is also reported. GRAPHICAL ABSTRACT","PeriodicalId":12768,"journal":{"name":"Green Chemistry Letters and Reviews","volume":null,"pages":null},"PeriodicalIF":6.6,"publicationDate":"2023-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89644533","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-01-02DOI: 10.1080/17518253.2023.2188125
Matthieu M. Mention, C. Peyrot, B. Godon, Jimmy Alarcan, F. Brunissen, Marina Grimaldi, P. Balaguer, A. Braeuning, F. Allais
ABSTRACT With an increasing demand for safe and natural products from both industries and consumers, paired with the recent ban of decried molecules (i.e. octinoxate, avobenzone or octocrylene) due to their high negative impact on humans and the environment (i.e. endocrine disruption, coral bleaching), safe bio-based alternatives are a necessary and promising surrogate to substitute current commercialized petroleum-based UV filters. In this context, a class of bio-based molecules, displaying interesting UV-B filtering properties and great photostability were developed from furfural and 5-hydroxymethylfurfural (HMF), using the Knoevenagel condensation with a set of green conditions to minimize the impact on environment. Furthermore, those furfural- and HMF-based molecules demonstrated antimicrobial properties as secondary activity, highly sought by industries. Some furan derivatives being recognized to exhibit toxicological risks, in silico and in vitro assays were conducted and demonstrated the absence of endocrine disruption activity for these new molecules. GRAPHICAL ABSTRACT
{"title":"Straightforward sustainable synthesis of novel non-endocrine disruptive bio-based organic UV-B filters with antimicrobial activity","authors":"Matthieu M. Mention, C. Peyrot, B. Godon, Jimmy Alarcan, F. Brunissen, Marina Grimaldi, P. Balaguer, A. Braeuning, F. Allais","doi":"10.1080/17518253.2023.2188125","DOIUrl":"https://doi.org/10.1080/17518253.2023.2188125","url":null,"abstract":"ABSTRACT With an increasing demand for safe and natural products from both industries and consumers, paired with the recent ban of decried molecules (i.e. octinoxate, avobenzone or octocrylene) due to their high negative impact on humans and the environment (i.e. endocrine disruption, coral bleaching), safe bio-based alternatives are a necessary and promising surrogate to substitute current commercialized petroleum-based UV filters. In this context, a class of bio-based molecules, displaying interesting UV-B filtering properties and great photostability were developed from furfural and 5-hydroxymethylfurfural (HMF), using the Knoevenagel condensation with a set of green conditions to minimize the impact on environment. Furthermore, those furfural- and HMF-based molecules demonstrated antimicrobial properties as secondary activity, highly sought by industries. Some furan derivatives being recognized to exhibit toxicological risks, in silico and in vitro assays were conducted and demonstrated the absence of endocrine disruption activity for these new molecules. GRAPHICAL ABSTRACT","PeriodicalId":12768,"journal":{"name":"Green Chemistry Letters and Reviews","volume":null,"pages":null},"PeriodicalIF":6.6,"publicationDate":"2023-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72420466","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-01-02DOI: 10.1080/17518253.2023.2185107
M. Nigam, Dylan Tuttle, Barbora Morra, A. Dicks, Jose Rodriguez
ABSTRACT A less hazardous and energy efficient reaction performed using freshly squeezed citrus juice as solvent has been designed and implemented within a sophomore level organic chemistry laboratory. The primary learning objectives are to enable students to (i) identify and reflect upon various green chemistry principles such as waste prevention, atom economy, less hazardous synthesis, use of safer chemicals, catalysis, design for energy efficiency, and inherently safer chemistry for accident prevention; (ii) use proton NMR spectroscopic data to characterize a synthesized Schiff base (imine); and (iii) describe the reaction mechanism for imine formation, including the reasoning for why citrus juice is an excellent reaction medium. Specifically, 4-nitrobenzaldehyde is combined with 4-methoxyaniline at room temperature in the presence of four different fruit juices as reaction media to successfully synthesize an imine that is expensive to procure commercially. This is followed by students undertaking reduction of the imine to form a secondary amine which has a dramatically distinct color due to the disruption in conjugation. In performing this overall reductive amination, students expand their knowledge on acid-catalyzed imine synthesis and its mechanism, strengthen their practical skills in the laboratory, and reflect on green chemistry principles within the context of fundamental organic reactivity. GRAPHICAL ABSTRACT
{"title":"Putting the squeeze on imine synthesis: citrus juice as a reaction medium in the introductory organic laboratory","authors":"M. Nigam, Dylan Tuttle, Barbora Morra, A. Dicks, Jose Rodriguez","doi":"10.1080/17518253.2023.2185107","DOIUrl":"https://doi.org/10.1080/17518253.2023.2185107","url":null,"abstract":"ABSTRACT\u0000 A less hazardous and energy efficient reaction performed using freshly squeezed citrus juice as solvent has been designed and implemented within a sophomore level organic chemistry laboratory. The primary learning objectives are to enable students to (i) identify and reflect upon various green chemistry principles such as waste prevention, atom economy, less hazardous synthesis, use of safer chemicals, catalysis, design for energy efficiency, and inherently safer chemistry for accident prevention; (ii) use proton NMR spectroscopic data to characterize a synthesized Schiff base (imine); and (iii) describe the reaction mechanism for imine formation, including the reasoning for why citrus juice is an excellent reaction medium. Specifically, 4-nitrobenzaldehyde is combined with 4-methoxyaniline at room temperature in the presence of four different fruit juices as reaction media to successfully synthesize an imine that is expensive to procure commercially. This is followed by students undertaking reduction of the imine to form a secondary amine which has a dramatically distinct color due to the disruption in conjugation. In performing this overall reductive amination, students expand their knowledge on acid-catalyzed imine synthesis and its mechanism, strengthen their practical skills in the laboratory, and reflect on green chemistry principles within the context of fundamental organic reactivity. GRAPHICAL ABSTRACT","PeriodicalId":12768,"journal":{"name":"Green Chemistry Letters and Reviews","volume":null,"pages":null},"PeriodicalIF":6.6,"publicationDate":"2023-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79470715","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-01-02DOI: 10.1080/17518253.2022.2152740
Zulqarnain, Mohd Hizami Mohd Yusoff, L. K. Keong, N. H. Yasin, M. S. Rafeen, Amiruddin Hassan, G. Srinivasan, S. Yusup, A. Shariff, A. B. Jaafar
ABSTRACT Renewable energies have gained momentum in energy transition agenda based on the benefit of lower emissions of carbon and its compounds. Many technologies have been developed at different technology readiness levels addressing climate change impact with reduced emissions of greenhouse gases such as CO2. Herein the perspective article, we have reviewed CO2 capture technologies, such as absorption, adsorption, membrane separation, cryogenic separation and separation via hydrate formation, with further focus on the possibility of utilising ocean thermal energy conversion (OTEC) power to generate green hydrogen and produce low carbon fuels. The potential of OTEC generated hydrogen to produce methanol was explored using a simulation exercise utilising a scenario from a real-life offshore gas production facility. By varying the catalysts and reaction conditions, the findings showed encouraging results of CO2 conversion of ≥50% and product yield of ≥80%. Considering single path reaction with 90%, 95% and 99% of recycling, the highest prediction of methanol production coupled with CO2 hydrogenation process was 276.59 metric tonnes per day (MTPD). In addition, based on the assumption of 13.5 million standard cubic feet per day (MMSCFD) of CO2 produced, 204 MW of OTEC power is required to convert approximately 97.82 MTPD of hydrogen for methanol production making it potentially an industrially viable process. GRAPHICAL ABSTRACT
{"title":"Recent development of integrating CO2 hydrogenation into methanol with ocean thermal energy conversion (OTEC) as potential source of green energy","authors":"Zulqarnain, Mohd Hizami Mohd Yusoff, L. K. Keong, N. H. Yasin, M. S. Rafeen, Amiruddin Hassan, G. Srinivasan, S. Yusup, A. Shariff, A. B. Jaafar","doi":"10.1080/17518253.2022.2152740","DOIUrl":"https://doi.org/10.1080/17518253.2022.2152740","url":null,"abstract":"ABSTRACT Renewable energies have gained momentum in energy transition agenda based on the benefit of lower emissions of carbon and its compounds. Many technologies have been developed at different technology readiness levels addressing climate change impact with reduced emissions of greenhouse gases such as CO2. Herein the perspective article, we have reviewed CO2 capture technologies, such as absorption, adsorption, membrane separation, cryogenic separation and separation via hydrate formation, with further focus on the possibility of utilising ocean thermal energy conversion (OTEC) power to generate green hydrogen and produce low carbon fuels. The potential of OTEC generated hydrogen to produce methanol was explored using a simulation exercise utilising a scenario from a real-life offshore gas production facility. By varying the catalysts and reaction conditions, the findings showed encouraging results of CO2 conversion of ≥50% and product yield of ≥80%. Considering single path reaction with 90%, 95% and 99% of recycling, the highest prediction of methanol production coupled with CO2 hydrogenation process was 276.59 metric tonnes per day (MTPD). In addition, based on the assumption of 13.5 million standard cubic feet per day (MMSCFD) of CO2 produced, 204 MW of OTEC power is required to convert approximately 97.82 MTPD of hydrogen for methanol production making it potentially an industrially viable process. GRAPHICAL ABSTRACT","PeriodicalId":12768,"journal":{"name":"Green Chemistry Letters and Reviews","volume":null,"pages":null},"PeriodicalIF":6.6,"publicationDate":"2023-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82859977","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-01-02DOI: 10.1080/17518253.2023.2174818
Isha Gautam, T. Grady, Harshica Fernando
ABSTRACT Environmental pollution is a global issue, and the contamination of water by dyes is a matter of concern. This work reports an environmentally friendly method for degrading methyl orange dye using iron nanoparticles (INPs) synthesized from pasteurized cow and goat milk and ferric chloride (FeCl3). INPs were synthesized using FeCl3 and milk mixed in a 1:2 (v/v) ratio and subsequently heated at 70 0C. The formation of INPs was monitored by visualizing the color changes. The synthesized NPs were characterized by FTIR, SEM, EDS, TEM, XRD, and XPS. The XRD results showed that INPs were formed and had an amorphous structure. TEM data showed smaller semi-spherical particles with sizes of 8-27 nm, and they were present in an aggregated state. Dye degradation studies were conducted using INP with UV light exposure and H2O2 addition. Both the processes were monitored using UV/Vis scans at different time intervals. The results showed that the degradation of methyl orange was faster in the presence of H2O2 (over 85% efficiency in 60 min) than in the presence of UV light. The current study shows that the INPs formed using milk have the potential to be used as catalysts in azo dye degradation reactions. GRAPHICAL ABSTRACT
{"title":"Degradation of the dye methyl orange using cow and goat milk iron nanoparticles","authors":"Isha Gautam, T. Grady, Harshica Fernando","doi":"10.1080/17518253.2023.2174818","DOIUrl":"https://doi.org/10.1080/17518253.2023.2174818","url":null,"abstract":"ABSTRACT Environmental pollution is a global issue, and the contamination of water by dyes is a matter of concern. This work reports an environmentally friendly method for degrading methyl orange dye using iron nanoparticles (INPs) synthesized from pasteurized cow and goat milk and ferric chloride (FeCl3). INPs were synthesized using FeCl3 and milk mixed in a 1:2 (v/v) ratio and subsequently heated at 70 0C. The formation of INPs was monitored by visualizing the color changes. The synthesized NPs were characterized by FTIR, SEM, EDS, TEM, XRD, and XPS. The XRD results showed that INPs were formed and had an amorphous structure. TEM data showed smaller semi-spherical particles with sizes of 8-27 nm, and they were present in an aggregated state. Dye degradation studies were conducted using INP with UV light exposure and H2O2 addition. Both the processes were monitored using UV/Vis scans at different time intervals. The results showed that the degradation of methyl orange was faster in the presence of H2O2 (over 85% efficiency in 60 min) than in the presence of UV light. The current study shows that the INPs formed using milk have the potential to be used as catalysts in azo dye degradation reactions. GRAPHICAL ABSTRACT","PeriodicalId":12768,"journal":{"name":"Green Chemistry Letters and Reviews","volume":null,"pages":null},"PeriodicalIF":6.6,"publicationDate":"2023-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84103178","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-01-02DOI: 10.1080/17518253.2023.2196031
M. G. A. da Cruz, Joy Onwumere, Jianhong Chen, B. Beele, M. Yarema, Serhiy Budnyk, Adam Slabon, Bruno V. M. Rodrigues
ABSTRACT Photoluminescent carbon nanoparticles (CNPs), such as carbon dots (CDs), have attracted much attention owing to a unique set of properties, like high and tunable fluorescence. In this way, the use of carbon-rich lignin has been demonstrated to be a sustainable approach to producing a broad range of photoluminescent CNPs. However, the valorization of this complex polyphenol is limited when it comes to green and efficient ways of conversion. In addition, the existing solvothermal approaches using lignin often result in CDs with low photoluminescence, while flammable and/or toxic solvents are employed. Here, we depolymerized technical lignins, i.e. kraft and soda, through electroreductive cleavage in two different sustainable media: deep eutectic solvent and levulinic acid. After depolymerization, lignin-derived monomers were generated, with a predominance of aryl ether and phenolic groups, which were further combined with 1,2-Phenylenediamine to produce N-doped CNPs in a solvent-free approach. Photoluminescent CNPs with varied sizes were generated (5–50 nm), which presented a wide photoluminescence emission, from blue to red, depending on solvent polarity. These results demonstrate a feasible and sustainable route for the solvent-free synthesis of photoluminescent CNPs using lignin-derived monomers as carbon source, which may find applications in a wide range of fields. GRAPHICAL ABSTRACT
{"title":"Solvent-free synthesis of photoluminescent carbon nanoparticles from lignin-derived monomers as feedstock","authors":"M. G. A. da Cruz, Joy Onwumere, Jianhong Chen, B. Beele, M. Yarema, Serhiy Budnyk, Adam Slabon, Bruno V. M. Rodrigues","doi":"10.1080/17518253.2023.2196031","DOIUrl":"https://doi.org/10.1080/17518253.2023.2196031","url":null,"abstract":"ABSTRACT Photoluminescent carbon nanoparticles (CNPs), such as carbon dots (CDs), have attracted much attention owing to a unique set of properties, like high and tunable fluorescence. In this way, the use of carbon-rich lignin has been demonstrated to be a sustainable approach to producing a broad range of photoluminescent CNPs. However, the valorization of this complex polyphenol is limited when it comes to green and efficient ways of conversion. In addition, the existing solvothermal approaches using lignin often result in CDs with low photoluminescence, while flammable and/or toxic solvents are employed. Here, we depolymerized technical lignins, i.e. kraft and soda, through electroreductive cleavage in two different sustainable media: deep eutectic solvent and levulinic acid. After depolymerization, lignin-derived monomers were generated, with a predominance of aryl ether and phenolic groups, which were further combined with 1,2-Phenylenediamine to produce N-doped CNPs in a solvent-free approach. Photoluminescent CNPs with varied sizes were generated (5–50 nm), which presented a wide photoluminescence emission, from blue to red, depending on solvent polarity. These results demonstrate a feasible and sustainable route for the solvent-free synthesis of photoluminescent CNPs using lignin-derived monomers as carbon source, which may find applications in a wide range of fields. GRAPHICAL ABSTRACT","PeriodicalId":12768,"journal":{"name":"Green Chemistry Letters and Reviews","volume":null,"pages":null},"PeriodicalIF":6.6,"publicationDate":"2023-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78617209","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
ABSTRACT An unusual NBS promoted cascade reaction of β-anhydroicaritine and alcohols was successfully developed to prepare chromane-3,4-dione 3 in a moderate yield. A mechanism was also put forward to explain this reaction. These chromane-3,4-dione derivatives showed a potent cytotoxicity against HepG2 and MCF-7 cell lines, which were expected to be a potential lead candidate for the treatment of liver cancer and breast cancer. GRAPHICAL ABSTRACT
{"title":"NBS promoted cascade reaction of β-anhydroicaritine and alcohols","authors":"Hanqi Cui, Xianheng Wang, Shuang Qian, Yuqi He, Changkuo Zhao","doi":"10.1080/17518253.2022.2148836","DOIUrl":"https://doi.org/10.1080/17518253.2022.2148836","url":null,"abstract":"ABSTRACT An unusual NBS promoted cascade reaction of β-anhydroicaritine and alcohols was successfully developed to prepare chromane-3,4-dione 3 in a moderate yield. A mechanism was also put forward to explain this reaction. These chromane-3,4-dione derivatives showed a potent cytotoxicity against HepG2 and MCF-7 cell lines, which were expected to be a potential lead candidate for the treatment of liver cancer and breast cancer. GRAPHICAL ABSTRACT","PeriodicalId":12768,"journal":{"name":"Green Chemistry Letters and Reviews","volume":null,"pages":null},"PeriodicalIF":6.6,"publicationDate":"2023-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74886135","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-01-02DOI: 10.1080/17518253.2023.2173025
M. Kigozi, G. Kasozi, Sachin Balaso Mohite, S. Zamisa, R. Karpoormath, J. Kirabira, E. Tebandeke
ABSTRACT Poly(ethylene terephthalate) (PET) has a wide range of applications that generate a lot of waste globally; thus, upcycling PET is important because it offers several industrial and economic advantages. This study describes a sustainable, emissions-free process for converting PET plastics into carbon nanomaterials (CNMs) named PT-nano powder. The thermal-hydrothermal method has employed the production of PT-nano powder above the glass transition temperature (Tg) of PET plastics. Under optimal conditions, PET plastics were efficiently converted into PT-nano powder with 86.6% crystallinity and an average particle size of 6.5 nm. The PT-nano powder was characterized for physical and chemical properties using different techniques, including UV-Vis, FTIR, Raman spectroscopy, XRD, FESEM, TEM, and proton NMR analysis. The characterization confirms the complete conversion of PET to solid fractions of carbon nanomaterial. The PT-nano powder was tested in supercapacitor performance application with electrochemical characterization. The symmetric fabrication showed a specific capacitance of 250.8 F/g, energy density of 34.83Wh/kg, and power density of 999.9W/kg with a current density of 0.5A/g. The device fabrication exhibited high cycle stability and high capacitance retention of 96.8% with a current density of 1.5A/g after 10000 cycles. GRAPHICAL ABSTRACT
{"title":"Non-emission hydrothermal low-temperature synthesis of carbon nanomaterials from poly (ethylene terephthalate) plastic waste for excellent supercapacitor applications","authors":"M. Kigozi, G. Kasozi, Sachin Balaso Mohite, S. Zamisa, R. Karpoormath, J. Kirabira, E. Tebandeke","doi":"10.1080/17518253.2023.2173025","DOIUrl":"https://doi.org/10.1080/17518253.2023.2173025","url":null,"abstract":"ABSTRACT Poly(ethylene terephthalate) (PET) has a wide range of applications that generate a lot of waste globally; thus, upcycling PET is important because it offers several industrial and economic advantages. This study describes a sustainable, emissions-free process for converting PET plastics into carbon nanomaterials (CNMs) named PT-nano powder. The thermal-hydrothermal method has employed the production of PT-nano powder above the glass transition temperature (Tg) of PET plastics. Under optimal conditions, PET plastics were efficiently converted into PT-nano powder with 86.6% crystallinity and an average particle size of 6.5 nm. The PT-nano powder was characterized for physical and chemical properties using different techniques, including UV-Vis, FTIR, Raman spectroscopy, XRD, FESEM, TEM, and proton NMR analysis. The characterization confirms the complete conversion of PET to solid fractions of carbon nanomaterial. The PT-nano powder was tested in supercapacitor performance application with electrochemical characterization. The symmetric fabrication showed a specific capacitance of 250.8 F/g, energy density of 34.83Wh/kg, and power density of 999.9W/kg with a current density of 0.5A/g. The device fabrication exhibited high cycle stability and high capacitance retention of 96.8% with a current density of 1.5A/g after 10000 cycles. GRAPHICAL ABSTRACT","PeriodicalId":12768,"journal":{"name":"Green Chemistry Letters and Reviews","volume":null,"pages":null},"PeriodicalIF":6.6,"publicationDate":"2023-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75470486","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Cr(VI) compounds have important industrial applications and are used in various sectors like tanning, chrome plating, anti-corrosion agents and wood preservation. The Cr(VI) contamination in the wastewater is generally due to several natural and anthropogenic sources. Anthropogenic activities like several industrial operations play a major role in the Cr(VI) contamination in the aquatic ecosystem. Cr(VI) well-known toxic metal ion and its exposure in humans causes several health issues. Cr(VI) enters the cells and gradually reduces into a lower oxidation state and generates oxidative stress in the cell which damages cell organelles. The Cr(VI) mediated genotoxicity has been described as damaging the DNA base pairing, sugar-phosphate backbone, histone modification and chromosomal damage. Water and wastewater must be treated to remove Cr(VI) due to its high toxicity. There are several, physiochemical methods used for Cr(VI) remediation but these approaches are expensive and produce hazardous sludge during the treatment process. Therefore, a suitable environmentally friendly and effective Cr(VI) removal approach is urgently needed. Microbial removal of Cr(VI) is considered an eco-friendly and cost-effective process. In this, the authors focused on sources, genotoxicity and microbial remediation approaches of Cr(VI).
{"title":"Source of Cr(VI) in the aquatic ecosystem, its genotoxic effects and microbial removal from contaminated water","authors":"Veer Singh, Kumar Abhishek, Sachchida Nand Rai, Santosh K. Singh, Emanuel Vamanu, Ashish Kumar","doi":"10.1080/17518253.2023.2267079","DOIUrl":"https://doi.org/10.1080/17518253.2023.2267079","url":null,"abstract":"Cr(VI) compounds have important industrial applications and are used in various sectors like tanning, chrome plating, anti-corrosion agents and wood preservation. The Cr(VI) contamination in the wastewater is generally due to several natural and anthropogenic sources. Anthropogenic activities like several industrial operations play a major role in the Cr(VI) contamination in the aquatic ecosystem. Cr(VI) well-known toxic metal ion and its exposure in humans causes several health issues. Cr(VI) enters the cells and gradually reduces into a lower oxidation state and generates oxidative stress in the cell which damages cell organelles. The Cr(VI) mediated genotoxicity has been described as damaging the DNA base pairing, sugar-phosphate backbone, histone modification and chromosomal damage. Water and wastewater must be treated to remove Cr(VI) due to its high toxicity. There are several, physiochemical methods used for Cr(VI) remediation but these approaches are expensive and produce hazardous sludge during the treatment process. Therefore, a suitable environmentally friendly and effective Cr(VI) removal approach is urgently needed. Microbial removal of Cr(VI) is considered an eco-friendly and cost-effective process. In this, the authors focused on sources, genotoxicity and microbial remediation approaches of Cr(VI).","PeriodicalId":12768,"journal":{"name":"Green Chemistry Letters and Reviews","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135799878","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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