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Upcycling hazardous waste into high-performance Ni/η-Al2O3 catalysts for CO2 methanation.
IF 9.3 1区 化学 Q1 CHEMISTRY, MULTIDISCIPLINARY Pub Date : 2025-02-07 DOI: 10.1039/d4gc05217j
Qaisar Maqbool, Hamilton Uchenna Aharanwa, Michael Stöger-Pollach, Günther Rupprechter

Transforming hazardous and difficult-to-process waste materials, like spent Ni-MH batteries and aluminium foil, into nanocatalysts (NCts) provides a sustainable solution for resource management and reducing environmental impact. This study demonstrates a novel approach by extracting nickel sulfate (NiSO4·xH2O) from battery waste and subsequently converting it into Ni(OH)2 hydrogel precursors using l-glutamic acid. Waste aluminium foil was processed into alumina (Al2O3), and combined with Ni(OH)2 to synthesize Ni/η-Al2O3 NCts with 4% and 8% Ni loading. Characterization through XRD/SAED, STEM/EFTEM, and EELS revealed a disordered cubic structure of η-Al2O3, with well-dispersed Ni particles, making it effective for CO2 hydrogenation. The 8-Ni/η-Al2O3 exhibited the best catalytic performance, with CH4 selectivity of 99.8% and space time yield (STY) of 80.3 mmolCH4 gcat -1 h-1 at 400 °C. The CO2 methanation mechanism over Ni/η-Al2O3 NCts was further explored using operando DRIFTS aligned with GC + MS. The operando investigation suggested a preferential associative CO2 methanation pathway, involving sequential adsorption and hydrogenation of CO2 to hydrogen carbonates on Ni/η-Al2O3, and their transformation into formate and methoxy intermediates leading to methane. Finally, to complete the upcycling/recycling loop, the spent Ni/η-Al2O3 NCts were recycled into Ni and Al precursors. These findings underscore the potential of upcycling waste materials for synthesizing sustainable, high-performance NCts, and offer insights into the CO2 methanation mechanism.

{"title":"Upcycling hazardous waste into high-performance Ni/η-Al<sub>2</sub>O<sub>3</sub> catalysts for CO<sub>2</sub> methanation.","authors":"Qaisar Maqbool, Hamilton Uchenna Aharanwa, Michael Stöger-Pollach, Günther Rupprechter","doi":"10.1039/d4gc05217j","DOIUrl":"10.1039/d4gc05217j","url":null,"abstract":"<p><p>Transforming hazardous and difficult-to-process waste materials, like spent Ni-MH batteries and aluminium foil, into nanocatalysts (NCts) provides a sustainable solution for resource management and reducing environmental impact. This study demonstrates a novel approach by extracting nickel sulfate (NiSO<sub>4</sub>·<i>x</i>H<sub>2</sub>O) from battery waste and subsequently converting it into Ni(OH)<sub>2</sub> hydrogel precursors using l-glutamic acid. Waste aluminium foil was processed into alumina (Al<sub>2</sub>O<sub>3</sub>), and combined with Ni(OH)<sub>2</sub> to synthesize Ni/η-Al<sub>2</sub>O<sub>3</sub> NCts with 4% and 8% Ni loading. Characterization through XRD/SAED, STEM/EFTEM, and EELS revealed a disordered cubic structure of η-Al<sub>2</sub>O<sub>3</sub>, with well-dispersed Ni particles, making it effective for CO<sub>2</sub> hydrogenation. The 8-Ni/η-Al<sub>2</sub>O<sub>3</sub> exhibited the best catalytic performance, with CH<sub>4</sub> selectivity of 99.8% and space time yield (STY) of 80.3 mmol<sub>CH<sub>4</sub></sub> g<sub>cat</sub> <sup>-1</sup> h<sup>-1</sup> at 400 °C. The CO<sub>2</sub> methanation mechanism over Ni/η-Al<sub>2</sub>O<sub>3</sub> NCts was further explored using <i>operando</i> DRIFTS aligned with GC + MS. The <i>operando</i> investigation suggested a preferential associative CO<sub>2</sub> methanation pathway, involving sequential adsorption and hydrogenation of CO<sub>2</sub> to hydrogen carbonates on Ni/η-Al<sub>2</sub>O<sub>3</sub>, and their transformation into formate and methoxy intermediates leading to methane. Finally, to complete the upcycling/recycling loop, the spent Ni/η-Al<sub>2</sub>O<sub>3</sub> NCts were recycled into Ni and Al precursors. These findings underscore the potential of upcycling waste materials for synthesizing sustainable, high-performance NCts, and offer insights into the CO<sub>2</sub> methanation mechanism.</p>","PeriodicalId":78,"journal":{"name":"Green Chemistry","volume":" ","pages":""},"PeriodicalIF":9.3,"publicationDate":"2025-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11826383/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143432054","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Correction: Acid catalyst screening for hydrolysis of post-consumer PET waste and exploration of acidolysis
IF 9.3 1区 化学 Q1 CHEMISTRY, MULTIDISCIPLINARY Pub Date : 2025-01-27 DOI: 10.1039/D5GC90017D
Patrícia Pereira, Phillip E. Savage and Christian W. Pester

Correction for ‘Acid catalyst screening for hydrolysis of post-consumer PET waste and exploration of acidolysis’ by Patrícia Pereira et al., Green Chem., 2024, 26, 1964–1974, https://doi.org/10.1039/D3GC03906D.

{"title":"Correction: Acid catalyst screening for hydrolysis of post-consumer PET waste and exploration of acidolysis","authors":"Patrícia Pereira, Phillip E. Savage and Christian W. Pester","doi":"10.1039/D5GC90017D","DOIUrl":"https://doi.org/10.1039/D5GC90017D","url":null,"abstract":"<p >Correction for ‘Acid catalyst screening for hydrolysis of post-consumer PET waste and exploration of acidolysis’ by Patrícia Pereira <em>et al.</em>, <em>Green Chem.</em>, 2024, <strong>26</strong>, 1964–1974, https://doi.org/10.1039/D3GC03906D.</p>","PeriodicalId":78,"journal":{"name":"Green Chemistry","volume":" 7","pages":" 2165-2166"},"PeriodicalIF":9.3,"publicationDate":"2025-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.rsc.org/en/content/articlepdf/2025/gc/d5gc90017d?page=search","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143373156","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Mechanochemical fluorination of unactivated tertiary alkyl chlorides†
IF 9.3 1区 化学 Q1 CHEMISTRY, MULTIDISCIPLINARY Pub Date : 2025-01-21 DOI: 10.1039/d4gc05972g
Jiemin Wang , Xueyan Yang , Cheng Peng , Mengyao Pei , Xiaofeng Wei
We present here a high-efficiency, eco-friendly method for synthesizing alkyl fluorides (15 min, 50–89% yields) through halogen exchange, utilizing simple and readily available alkyl halides as starting materials. This catalyst-free method employs AgF as the fluorine source, operates under ball milling conditions, demonstrates broad functional group compatibility, and has found application in the synthesis of key intermediates for the marketed drug ledipasvir.
{"title":"Mechanochemical fluorination of unactivated tertiary alkyl chlorides†","authors":"Jiemin Wang ,&nbsp;Xueyan Yang ,&nbsp;Cheng Peng ,&nbsp;Mengyao Pei ,&nbsp;Xiaofeng Wei","doi":"10.1039/d4gc05972g","DOIUrl":"10.1039/d4gc05972g","url":null,"abstract":"<div><div>We present here a high-efficiency, eco-friendly method for synthesizing alkyl fluorides (15 min, 50–89% yields) through halogen exchange, utilizing simple and readily available alkyl halides as starting materials. This catalyst-free method employs AgF as the fluorine source, operates under ball milling conditions, demonstrates broad functional group compatibility, and has found application in the synthesis of key intermediates for the marketed drug ledipasvir.</div></div>","PeriodicalId":78,"journal":{"name":"Green Chemistry","volume":"27 8","pages":"Pages 2197-2202"},"PeriodicalIF":9.3,"publicationDate":"2025-01-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143430724","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Anodic electrochemical C–C bond cleavage co-catalyzed by ionic liquids and FeNi@C for lignin upgrading†
IF 9.3 1区 化学 Q1 CHEMISTRY, MULTIDISCIPLINARY Pub Date : 2025-01-21 DOI: 10.1039/d4gc06414c
Weiwei Wang , Yuqing Zhai , Xiaoyan Ji , Hao Wang , Yanrong Liu
Electrochemical oxidation of lignin for the production of high-value aromatic aldehydes, while co-generating hydrogen, represents a promising strategy to achieve dual benefits. However, the selective electrochemical cleavage of the nonpolar and robust C–C bonds in lignin presents tremendous challenges. Here, FeNi@C derived from metal–organic frameworks (MOFs) is designed for the high-selectivity electrochemical oxidation of the lignin model compound veratrylglycerol-β-guaiacyl ether (VG) to achieve C–C bond cleavage, resulting in the production of veratraldehyde (VAld). Moreover, a trace amount of an ionic liquid (IL) additive is incorporated into the electrolyte to further optimize the selectivity for VAld. In an anion exchange membrane (AEM) single cell, the FeNi@C anode, under the synergistic catalytic effect of BmpyrroCl, demonstrates a remarkable conversion efficiency of up to 89.8% for VG, with the yield and selectivity of VAld reaching 63.9% and 70.1%, respectively. Notably, this approach demonstrates exceptional performance in lignin upgrading, achieving an aromatic aldehyde yield of 23.5 wt%, with VAld showing a yield and selectivity of 7.3 wt% and 31.1%, respectively, highlighting its significant practical potential. In situ electron spin resonance (ESR) analysis and density functional theory (DFT) calculations reveal that the exceptional selectivity of FeNi@C for VAld is attributed to the ability of Fe to serve as an electronic conversion switch, regulating the valence state of Ni. Specifically, it enhances the formation of highly active Ni3+δ at 1.4 V, fostering C–C bond dissociation while mitigating the continuous oxidation of Ni3+δ to higher valence states, thereby inhibiting the undesired conversion of VAld to veratric acid (VAc). The Gaussian calculation results indicate that the strong hydrogen bond between the ILs and Cα–OH promotes the preactivation of VG, thus exerting a synergistic catalytic effect on FeNi@C.
{"title":"Anodic electrochemical C–C bond cleavage co-catalyzed by ionic liquids and FeNi@C for lignin upgrading†","authors":"Weiwei Wang ,&nbsp;Yuqing Zhai ,&nbsp;Xiaoyan Ji ,&nbsp;Hao Wang ,&nbsp;Yanrong Liu","doi":"10.1039/d4gc06414c","DOIUrl":"10.1039/d4gc06414c","url":null,"abstract":"<div><div>Electrochemical oxidation of lignin for the production of high-value aromatic aldehydes, while co-generating hydrogen, represents a promising strategy to achieve dual benefits. However, the selective electrochemical cleavage of the nonpolar and robust C–C bonds in lignin presents tremendous challenges. Here, FeNi@C derived from metal–organic frameworks (MOFs) is designed for the high-selectivity electrochemical oxidation of the lignin model compound veratrylglycerol-β-guaiacyl ether (VG) to achieve C–C bond cleavage, resulting in the production of veratraldehyde (VAld). Moreover, a trace amount of an ionic liquid (IL) additive is incorporated into the electrolyte to further optimize the selectivity for VAld. In an anion exchange membrane (AEM) single cell, the FeNi@C anode, under the synergistic catalytic effect of BmpyrroCl, demonstrates a remarkable conversion efficiency of up to 89.8% for VG, with the yield and selectivity of VAld reaching 63.9% and 70.1%, respectively. Notably, this approach demonstrates exceptional performance in lignin upgrading, achieving an aromatic aldehyde yield of 23.5 wt%, with VAld showing a yield and selectivity of 7.3 wt% and 31.1%, respectively, highlighting its significant practical potential. <em>In situ</em> electron spin resonance (ESR) analysis and density functional theory (DFT) calculations reveal that the exceptional selectivity of FeNi@C for VAld is attributed to the ability of Fe to serve as an electronic conversion switch, regulating the valence state of Ni. Specifically, it enhances the formation of highly active Ni<sup>3+<em>δ</em></sup> at 1.4 V, fostering C–C bond dissociation while mitigating the continuous oxidation of Ni<sup>3+<em>δ</em></sup> to higher valence states, thereby inhibiting the undesired conversion of VAld to veratric acid (VAc). The Gaussian calculation results indicate that the strong hydrogen bond between the ILs and C<sub>α</sub>–OH promotes the preactivation of VG, thus exerting a synergistic catalytic effect on FeNi@C.</div></div>","PeriodicalId":78,"journal":{"name":"Green Chemistry","volume":"27 8","pages":"Pages 2238-2251"},"PeriodicalIF":9.3,"publicationDate":"2025-01-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143430734","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
A supported Fe/Ru catalyzed three-component relay reaction through a hydrogen borrowing strategy: conversion of crude α-hydroxy acids into valuable N-heterocycles†
IF 9.3 1区 化学 Q1 CHEMISTRY, MULTIDISCIPLINARY Pub Date : 2025-01-21 DOI: 10.1039/d4gc05518g
Shanshan Liu , Jia Wan , Yaoyao Zhang , Wen-Yu Luo , Weiwei Dong , Chao Wang , Lin-Yu Jiao
We developed an Fe–Ru/γ-Al2O3 relay catalyst to promote the multi-component reaction of biomass derived α-hydroxy acids and 2,5-dimethoxytetrahydrofuran with 2-nitroaromatic amines, enabling the synthesis of quinoxalines from inexpensive starting materials in one step. In this strategy, α-hydroxy acids displayed multifunctional roles as a hydrogen source, carbon synthon, and acidic additive. Notably, industrial grade lactic acid and mixed α-hydroxy acids extracted from fruits could be directly used and converted into a normalized quinoxaline product. Significantly, practical synthesis from glucose or fruits and successive transformation into a twisted-intramolecular charge transfer (TICT) based luminogen were accomplished nicely. Mechanistic studies showed that the equilibrium of the dehydrogenation step was promoted through tandem hydrogenation and cyclization reactions. Our work demonstrates the feasibility of chemical transformation of crude bio-based α-hydroxy acids into N-heterocycles and opens the way to provide high-value luminescent materials from biomass.
{"title":"A supported Fe/Ru catalyzed three-component relay reaction through a hydrogen borrowing strategy: conversion of crude α-hydroxy acids into valuable N-heterocycles†","authors":"Shanshan Liu ,&nbsp;Jia Wan ,&nbsp;Yaoyao Zhang ,&nbsp;Wen-Yu Luo ,&nbsp;Weiwei Dong ,&nbsp;Chao Wang ,&nbsp;Lin-Yu Jiao","doi":"10.1039/d4gc05518g","DOIUrl":"10.1039/d4gc05518g","url":null,"abstract":"<div><div>We developed an Fe–Ru/γ-Al<sub>2</sub>O<sub>3</sub> relay catalyst to promote the multi-component reaction of biomass derived α-hydroxy acids and 2,5-dimethoxytetrahydrofuran with 2-nitroaromatic amines, enabling the synthesis of quinoxalines from inexpensive starting materials in one step. In this strategy, α-hydroxy acids displayed multifunctional roles as a hydrogen source, carbon synthon, and acidic additive. Notably, industrial grade lactic acid and mixed α-hydroxy acids extracted from fruits could be directly used and converted into a normalized quinoxaline product. Significantly, practical synthesis from glucose or fruits and successive transformation into a twisted-intramolecular charge transfer (TICT) based luminogen were accomplished nicely. Mechanistic studies showed that the equilibrium of the dehydrogenation step was promoted through tandem hydrogenation and cyclization reactions. Our work demonstrates the feasibility of chemical transformation of crude bio-based α-hydroxy acids into N-heterocycles and opens the way to provide high-value luminescent materials from biomass.</div></div>","PeriodicalId":78,"journal":{"name":"Green Chemistry","volume":"27 8","pages":"Pages 2293-2301"},"PeriodicalIF":9.3,"publicationDate":"2025-01-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143430736","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
A catalyst- and thiol-free protocol for arene C–H thioetherification via photoactive electron donor–acceptor complexes†
IF 9.3 1区 化学 Q1 CHEMISTRY, MULTIDISCIPLINARY Pub Date : 2025-01-21 DOI: 10.1039/d4gc06257d
Ang Gao , He-Xiang Liu , Ya-Nan Zhou , Ming-Chen Fu
We present a catalyst- and thiol-free protocol for arene C–H thioetherification under visible light irradiation, yielding a diverse array of aryl alkyl thioethers, including d3-methyl aryl thioethers. A key discovery is that tetramethylthiourea can serve as both a sulfur source and an electron donor, facilitating the formation of the EDA complex with arylsulfonium salts. The method's effectiveness in gram-scale synthesis and adaptability for continuous flow processes underscore its significant synthetic potential and versatility.
{"title":"A catalyst- and thiol-free protocol for arene C–H thioetherification via photoactive electron donor–acceptor complexes†","authors":"Ang Gao ,&nbsp;He-Xiang Liu ,&nbsp;Ya-Nan Zhou ,&nbsp;Ming-Chen Fu","doi":"10.1039/d4gc06257d","DOIUrl":"10.1039/d4gc06257d","url":null,"abstract":"<div><div>We present a catalyst- and thiol-free protocol for arene C–H thioetherification under visible light irradiation, yielding a diverse array of aryl alkyl thioethers, including <em>d</em><sub>3</sub>-methyl aryl thioethers. A key discovery is that tetramethylthiourea can serve as both a sulfur source and an electron donor, facilitating the formation of the EDA complex with arylsulfonium salts. The method's effectiveness in gram-scale synthesis and adaptability for continuous flow processes underscore its significant synthetic potential and versatility.</div></div>","PeriodicalId":78,"journal":{"name":"Green Chemistry","volume":"27 8","pages":"Pages 2286-2292"},"PeriodicalIF":9.3,"publicationDate":"2025-01-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143430739","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
A fundamental study of lignin reactions with formaldehyde and glyoxal†
IF 9.3 1区 化学 Q1 CHEMISTRY, MULTIDISCIPLINARY Pub Date : 2025-01-21 DOI: 10.1039/d4gc05695g
Mohsen Siahkamari , Debkumar Debnath , Tuo Wang , Mojgan Nejad
This study investigates the synthesis and characterization of lignin-formaldehyde (LF) and fully biobased lignin-glyoxal (LG) resins as alternatives to the phenol-formaldehyde (PF) adhesive currently used in the manufacturing of plywood and oriented strand boards (OSB). In this process, phenol was entirely replaced by a commercially available kraft-softwood lignin, while formaldehyde was substituted with glyoxal (a biobased dialdehyde) in the LG resins. Additionally, lignin monomers were used as model compounds to better understand the behavior of lignin in LF and LG resins. The reactions of phenol, lignin monomers, and commercial lignin with formaldehyde and glyoxal were investigated through Fourier transform infrared (FT-IR) and nuclear magnetic resonance (NMR) spectroscopy in both solution and solid states. The results confirmed the successful integration of formaldehyde and glyoxal into phenolic structures, leading to the formation of methylene and glyoxylene linkages during resin synthesis. This process created a robust three-dimensional network, as evidenced by 2D 13C–13C correlation solid-state NMR spectra and FT-IR analyses, which are crucial in studying the structural properties of the cured thermoset solid resins that are insoluble in NMR solvents. These findings highlight the innovative potential of lignin as a renewable alternative to petroleum-based phenol and emphasize the practical applications of a fully biobased lignin-glyoxal adhesive in the production of greener, more sustainable, and formaldehyde-free plywood and OSB wood panels commonly used in building construction.
{"title":"A fundamental study of lignin reactions with formaldehyde and glyoxal†","authors":"Mohsen Siahkamari ,&nbsp;Debkumar Debnath ,&nbsp;Tuo Wang ,&nbsp;Mojgan Nejad","doi":"10.1039/d4gc05695g","DOIUrl":"10.1039/d4gc05695g","url":null,"abstract":"<div><div>This study investigates the synthesis and characterization of lignin-formaldehyde (LF) and fully biobased lignin-glyoxal (LG) resins as alternatives to the phenol-formaldehyde (PF) adhesive currently used in the manufacturing of plywood and oriented strand boards (OSB). In this process, phenol was entirely replaced by a commercially available kraft-softwood lignin, while formaldehyde was substituted with glyoxal (a biobased dialdehyde) in the LG resins. Additionally, lignin monomers were used as model compounds to better understand the behavior of lignin in LF and LG resins. The reactions of phenol, lignin monomers, and commercial lignin with formaldehyde and glyoxal were investigated through Fourier transform infrared (FT-IR) and nuclear magnetic resonance (NMR) spectroscopy in both solution and solid states. The results confirmed the successful integration of formaldehyde and glyoxal into phenolic structures, leading to the formation of methylene and glyoxylene linkages during resin synthesis. This process created a robust three-dimensional network, as evidenced by 2D <sup>13</sup>C–<sup>13</sup>C correlation solid-state NMR spectra and FT-IR analyses, which are crucial in studying the structural properties of the cured thermoset solid resins that are insoluble in NMR solvents. These findings highlight the innovative potential of lignin as a renewable alternative to petroleum-based phenol and emphasize the practical applications of a fully biobased lignin-glyoxal adhesive in the production of greener, more sustainable, and formaldehyde-free plywood and OSB wood panels commonly used in building construction.</div></div>","PeriodicalId":78,"journal":{"name":"Green Chemistry","volume":"27 8","pages":"Pages 2342-2358"},"PeriodicalIF":9.3,"publicationDate":"2025-01-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.rsc.org/en/content/articlepdf/2025/gc/d4gc05695g?page=search","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143430744","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Tandem chemical hydrolysis and bioelectrochemical upcycling of waste polyethylene terephthalate (PET) for sustainable biobutanol and ethanol production ensuring plastics circularity†
IF 9.3 1区 化学 Q1 CHEMISTRY, MULTIDISCIPLINARY Pub Date : 2025-01-21 DOI: 10.1039/d4gc04985c
Harishankar Kopperi , Vishnuvardhan Mamidi , G. Suresh , S. Venkata Mohan
To establish a sustainable plastic system, it is crucial to implement effective recycling and upcycling strategies that circulate the materials within the market and prevent them from entering the ecosystems. Polyethylene terephthalate (PET), which is the most widely used fossil-derived synthetic polyester, is usually disposed as waste. Development of novel chemical upcycling technologies that can transform plastic wastes into economically viable chemicals is crucial to establish a circular plastics economy. This study delineated a methodology to combine mild chemical pretreatment and biocatalysts via bio-electrofermentation for the conversion of waste PET to sustainable biofuel blendstocks. Initially, PET was depolymerised to its monomers using an alkali catalyst (>98% conversion efficiency), and their structural characteristics were confirmed using FT-IR, NMR (1H and 13C), TGA, FESEM, XRD and XPS techniques. Furthermore, co-culturing with Klebsiella sp. and Clostridium sp. showed positive result towards TPA degradation (55%–74%) with various applied poised potentials to yield high-value bio-fuels. The electrochemical analysis highlighted the role of applied potential in the bioelectrochemical system (BES), where the +0.8 V condition consistently demonstrated a better performance across all metrics, including electron flux, substrate conversion, and product yield. The maximum yield were found to be 0.31 g L−1  for butanol and 0.23 g L−1 for ethanol at +0.8 V in the BES. On the other hand, the life cycle assessment (LCA) methodology was employed to understand the environmental footprints of the studied upcycling process, and it showed a global warming potential of 1.13 ton CO2 eq. per ton biofuel. While, recycling PET accounted for 1.96 ton CO2 eq. and 3.06 ton CO2 eq. from the ideal PET production process. Alternatively, other chemical and enzymatic PET upcycling processes had 3–7 times higher impacts. Therefore, the present work paves a new way for the upcycling of PET and makes a significant contribution to the development of a circular plastics economy.
{"title":"Tandem chemical hydrolysis and bioelectrochemical upcycling of waste polyethylene terephthalate (PET) for sustainable biobutanol and ethanol production ensuring plastics circularity†","authors":"Harishankar Kopperi ,&nbsp;Vishnuvardhan Mamidi ,&nbsp;G. Suresh ,&nbsp;S. Venkata Mohan","doi":"10.1039/d4gc04985c","DOIUrl":"10.1039/d4gc04985c","url":null,"abstract":"<div><div>To establish a sustainable plastic system, it is crucial to implement effective recycling and upcycling strategies that circulate the materials within the market and prevent them from entering the ecosystems. Polyethylene terephthalate (PET), which is the most widely used fossil-derived synthetic polyester, is usually disposed as waste. Development of novel chemical upcycling technologies that can transform plastic wastes into economically viable chemicals is crucial to establish a circular plastics economy. This study delineated a methodology to combine mild chemical pretreatment and biocatalysts <em>via</em> bio-electrofermentation for the conversion of waste PET to sustainable biofuel blendstocks. Initially, PET was depolymerised to its monomers using an alkali catalyst (&gt;98% conversion efficiency), and their structural characteristics were confirmed using FT-IR, NMR (<sup>1</sup>H and <sup>13</sup>C), TGA, FESEM, XRD and XPS techniques. Furthermore, co-culturing with <em>Klebsiella</em> sp. and <em>Clostridium</em> sp. showed positive result towards TPA degradation (55%–74%) with various applied poised potentials to yield high-value bio-fuels. The electrochemical analysis highlighted the role of applied potential in the bioelectrochemical system (BES), where the +0.8 V condition consistently demonstrated a better performance across all metrics, including electron flux, substrate conversion, and product yield. The maximum yield were found to be 0.31 g L<sup>−1</sup>  for butanol and 0.23 g L<sup>−1</sup> for ethanol at +0.8 V in the BES. On the other hand, the life cycle assessment (LCA) methodology was employed to understand the environmental footprints of the studied upcycling process, and it showed a global warming potential of 1.13 ton CO<sub>2</sub> eq. per ton biofuel. While, recycling PET accounted for 1.96 ton CO<sub>2</sub> eq. and 3.06 ton CO<sub>2</sub> eq. from the ideal PET production process. Alternatively, other chemical and enzymatic PET upcycling processes had 3–7 times higher impacts. Therefore, the present work paves a new way for the upcycling of PET and makes a significant contribution to the development of a circular plastics economy.</div></div>","PeriodicalId":78,"journal":{"name":"Green Chemistry","volume":"27 8","pages":"Pages 2359-2373"},"PeriodicalIF":9.3,"publicationDate":"2025-01-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143430754","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
A green and sustainable catalytic protocol for methoxymethylation of primary amides using methanol with dihydrogen release†
IF 9.3 1区 化学 Q1 CHEMISTRY, MULTIDISCIPLINARY Pub Date : 2025-01-21 DOI: 10.1039/d4gc05864j
Reshma Babu , Ganesan Sivakumar , Smruti Rekha Padhy , Ekambaram Balaraman
A highly efficient and selective catalytic method for the methoxymethylation of primary amides with the liberation of dihydrogen under Mn(i) catalysis is reported. This marks the first report on the synthesis of N-(methoxymethyl)benzamide derivatives, including the synthesis of pharmaceutically important amides through the interrupted borrowing hydrogen (IBH) strategy. The current method showcases a broad substrate scope and utilizes methanol as a methoxy methylating agent and solvent medium. The present unprecedented strategy obviates the need for toxic reagents and multi-step synthesis protocols. Mechanistic, kinetic studies and isotopic labeling experiments were also performed to gain mechanistic insights.
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引用次数: 0
Tandem Diels–Alder reaction overrules entropy: the gate to thermally stable, yet thermally recyclable furan-based polymers†
IF 9.3 1区 化学 Q1 CHEMISTRY, MULTIDISCIPLINARY Pub Date : 2025-01-21 DOI: 10.1039/d4gc04846f
Daria V. Zakharova , Rinat R. Aysin , Alexander A. Pavlov , Dmirty A. Khanin , Elena O. Platonova , Yulia V. Nelyubina , Alexander V. Polezhaev
The study investigates the kinetics and thermodynamics of the reversible tandem Diels–Alder (tDA) reaction between difuranic compounds and maleimides, leading to the quantitative formation of tDA adducts at rates comparable to their counterparts from the “classical” Diels–Alder (DA) reaction. The tDA adducts exhibited unprecedented thermal stability up to 250 °C, which is 100 °C higher than that of the DA adducts, owing to the higher activation energy (Ea) required for the initial intramolecular step of the reverse process. The stability of the tDA adducts was exploited in the AA + BB type polymerization of tetrafuranic monomers with bis(maleimides), yielding thermally stable (up to 200 °C) yet depolymerasable linear polymers with molecular weights of 10–20 kDa. Only furanic groups were identified as the end-groups of the resulting polymers, suggesting the possibility for post-polymerization and end-group modifications. NMR and GPC kinetic data offered insights into the intermediate formation of classical adducts during polymerization, as well as the stereochemistry of tDA adducts in the polymer chains. Combined thermal analysis (DSC, TGA, and TMA) provided a comprehensive understanding of the reverse DA reaction in the resulting materials. This relatively clean, catalyst- and byproduct-free, well-controlled process, which uses derivatives of biorenewables as monomers, heralds the formation of a new class of thermally recyclable polymers.
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引用次数: 0
期刊
Green Chemistry
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