Pub Date : 2025-03-01Epub Date: 2024-03-22DOI: 10.1016/j.gce.2024.03.004
Ruihong Liu , Dongzhi Liu , Xiang Ma
Here, an innovative approach to achieve near-infrared (NIR) long-lived circularly polarized luminescence (CPL) in amorphous organic polymer materials was achieved. By co-doping bi-naphthalene derivative R/S-BPN as energy donors with porphyrin derivative TPPOH as energy acceptor into PVA polymer matrix, the NIR long-lifetime fluorescence was successfully realized through the principles of triplet-to-singlet Förster resonance energy transfer (TS-FRET). Photophysical characterizations revealed distinct room temperature phosphorescence (RTP) emission peaks and phosphorescence lifetimes for different donor-acceptor ratios. The TS-FRET process facilitated extended lifetime and red-shifted emission of the acceptor TPPOH. Moreover, employing the chiral donor R/S-BPN as chiral seeds to establish chiral environments facilitated the achievement of near-infrared CPL. These findings offer a novel and practical strategy for achieving long-wavelength and long-lifetime CPL fluorescence without complex molecular engineering, presenting potential applications in various technological fields.
{"title":"Near-infrared long-lifetime emission via triplet-to-singlet Förster resonance energy transfer","authors":"Ruihong Liu , Dongzhi Liu , Xiang Ma","doi":"10.1016/j.gce.2024.03.004","DOIUrl":"10.1016/j.gce.2024.03.004","url":null,"abstract":"<div><div>Here, an innovative approach to achieve near-infrared (NIR) long-lived circularly polarized luminescence (CPL) in amorphous organic polymer materials was achieved. By co-doping bi-naphthalene derivative R/S-BPN as energy donors with porphyrin derivative TPPOH as energy acceptor into PVA polymer matrix, the NIR long-lifetime fluorescence was successfully realized through the principles of triplet-to-singlet Förster resonance energy transfer (TS-FRET). Photophysical characterizations revealed distinct room temperature phosphorescence (RTP) emission peaks and phosphorescence lifetimes for different donor-acceptor ratios. The TS-FRET process facilitated extended lifetime and red-shifted emission of the acceptor TPPOH. Moreover, employing the chiral donor R/S-BPN as chiral seeds to establish chiral environments facilitated the achievement of near-infrared CPL. These findings offer a novel and practical strategy for achieving long-wavelength and long-lifetime CPL fluorescence without complex molecular engineering, presenting potential applications in various technological fields.</div></div>","PeriodicalId":66474,"journal":{"name":"Green Chemical Engineering","volume":"6 1","pages":"Pages 1-5"},"PeriodicalIF":9.1,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140273626","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-03-01Epub Date: 2024-06-01DOI: 10.1016/j.gce.2024.05.002
Zhaoyang Wang, Simin Wang, Yuan Zhang, Wentao Bi
This article presents a comprehensive overview of recent advancements in natural product extraction, focusing on the evolution from deep eutectic solvents (DESs) to deep eutectic systems (DESys) for extraction. DESs, known for their environmentally friendly properties, have become crucial in extracting various natural products from plants, including micromolecules, lignin, and polysaccharides. Research into the extraction mechanism reveals that target compounds typically form hydrogen bonds with DESs, effectively becoming part of the solvent system. This insight has led to the development of the DESys extraction method, where hydrogen bond acceptors (HBAs) and hydrogen bond donors (HBDs) are directly mixed with the sample to form a DESys containing the target compounds. The shift from DES-based extraction to DESys-based extraction introduces innovative approaches where target compounds are integral to the solvent system, allowing for one-step dissolution and extraction. This methodology eliminates the need for pre-prepared DESs, simplifying processes and enhancing extraction efficiency. Additionally, strategies for DESs recycling and reuse contribute to sustainability efforts, offering cost-effective and environmentally friendly extraction solutions. The expanding applications of DES-based and DESys-based natural product extraction in cosmetics, food, industry, and environmental fields highlight their promising development potential. By delineating the transition from DES-based to DESys-based extraction of natural products, this review offers valuable insights for advancing the practice of green chemical engineering.
本文全面概述了天然产物萃取领域的最新进展，重点介绍了从深共晶溶剂（DES）到深共晶系统（DESys）萃取的演变过程。DESs 因其环保特性而闻名，已成为从植物中提取各种天然产物（包括微分子、木质素和多糖）的关键。对萃取机理的研究表明，目标化合物通常会与 DES 形成氢键，从而有效地成为溶剂系统的一部分。这种见解促成了 DESys 萃取方法的开发，在这种方法中，氢键受体 (HBA) 和氢键供体 (HBD) 直接与样品混合，形成含有目标化合物的 DESys。从基于 DES 的萃取到基于 DESys 的萃取，引入了创新方法，目标化合物与溶剂系统融为一体，可实现一步溶解和萃取。这种方法无需预先制备 DES，从而简化了流程，提高了萃取效率。此外，DESs 回收和再利用战略有助于可持续发展，提供了具有成本效益和环保的萃取解决方案。基于 DES 和 DESys 的天然产品萃取技术在化妆品、食品、工业和环境领域的应用不断扩大，彰显了其巨大的发展潜力。本综述描述了从基于 DES 到基于 DESys 的天然产品萃取的过渡过程，为推动绿色化学工程的实践提供了宝贵的见解。
{"title":"Switching from deep eutectic solvents to deep eutectic systems for natural product extraction","authors":"Zhaoyang Wang, Simin Wang, Yuan Zhang, Wentao Bi","doi":"10.1016/j.gce.2024.05.002","DOIUrl":"10.1016/j.gce.2024.05.002","url":null,"abstract":"<div><div>This article presents a comprehensive overview of recent advancements in natural product extraction, focusing on the evolution from deep eutectic solvents (DESs) to deep eutectic systems (DESys) for extraction. DESs, known for their environmentally friendly properties, have become crucial in extracting various natural products from plants, including micromolecules, lignin, and polysaccharides. Research into the extraction mechanism reveals that target compounds typically form hydrogen bonds with DESs, effectively becoming part of the solvent system. This insight has led to the development of the DESys extraction method, where hydrogen bond acceptors (HBAs) and hydrogen bond donors (HBDs) are directly mixed with the sample to form a DESys containing the target compounds. The shift from DES-based extraction to DESys-based extraction introduces innovative approaches where target compounds are integral to the solvent system, allowing for one-step dissolution and extraction. This methodology eliminates the need for pre-prepared DESs, simplifying processes and enhancing extraction efficiency. Additionally, strategies for DESs recycling and reuse contribute to sustainability efforts, offering cost-effective and environmentally friendly extraction solutions. The expanding applications of DES-based and DESys-based natural product extraction in cosmetics, food, industry, and environmental fields highlight their promising development potential. By delineating the transition from DES-based to DESys-based extraction of natural products, this review offers valuable insights for advancing the practice of green chemical engineering.</div></div>","PeriodicalId":66474,"journal":{"name":"Green Chemical Engineering","volume":"6 1","pages":"Pages 36-53"},"PeriodicalIF":9.1,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141278624","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-03-01Epub Date: 2024-04-04DOI: 10.1016/j.gce.2024.03.005
Xuan Zhang , Yue Zhang , Haoran Li , Jia Yao
Solvents are commonly added into protic ionic liquids (PILs) to reduce viscosity in practical applications. Understanding the relationship between the structure and properties of PILs mixed with solvents is also essential for tailoring specific applications, however, such research is limited. In this study, we measured and compared the density, viscosity, and conductivity of three mixed systems: n-butylammonium butyrate ionic liquid (PIL) mixing with N-butyric acid (PrCOOH), PIL-N-butylamine (BuNH2), and PIL-N-butanol (BuOH). Small- and wide-angle X-ray scattering (S/WAXS), molecular dynamics (MD) simulation, and electron paramagnetic resonance (EPR) techniques were used to explore their inherent structural differences. The results indicate that the properties of the PIL-BuOH and PIL-PrCOOH systems exhibit more overall similarity in trends compared to the PIL-BuNH2 system. However, when the molar fraction of alcohol or acid exceeds 0.8, structural differences between the two systems lead to the differences in properties. The hydrogen bond network between the BuOH molecules outside the ion cluster leads to higher viscosity and conductivity than the PIL-PrCOOH system. However, the strong hydrogen bond between PrCOOH and anions will replace the position of cations and form spherical clusters. This research highlights how distinct structures influence diverse properties, providing deeper insights into the structure-property relationship.
{"title":"The different structure and properties of protic ionic liquid in alcohol from acid and base: butylammonium butyrate mixing with butanol, butyric acid, and butylamine respectively","authors":"Xuan Zhang , Yue Zhang , Haoran Li , Jia Yao","doi":"10.1016/j.gce.2024.03.005","DOIUrl":"10.1016/j.gce.2024.03.005","url":null,"abstract":"<div><div>Solvents are commonly added into protic ionic liquids (PILs) to reduce viscosity in practical applications. Understanding the relationship between the structure and properties of PILs mixed with solvents is also essential for tailoring specific applications, however, such research is limited. In this study, we measured and compared the density, viscosity, and conductivity of three mixed systems: <em>n</em>-butylammonium butyrate ionic liquid (PIL) mixing with <em>N</em>-butyric acid (PrCOOH), PIL-<em>N</em>-butylamine (BuNH<sub>2</sub>), and PIL-<em>N</em>-butanol (BuOH). Small- and wide-angle X-ray scattering (S/WAXS), molecular dynamics (MD) simulation, and electron paramagnetic resonance (EPR) techniques were used to explore their inherent structural differences. The results indicate that the properties of the PIL-BuOH and PIL-PrCOOH systems exhibit more overall similarity in trends compared to the PIL-BuNH<sub>2</sub> system. However, when the molar fraction of alcohol or acid exceeds 0.8, structural differences between the two systems lead to the differences in properties. The hydrogen bond network between the BuOH molecules outside the ion cluster leads to higher viscosity and conductivity than the PIL-PrCOOH system. However, the strong hydrogen bond between PrCOOH and anions will replace the position of cations and form spherical clusters. This research highlights how distinct structures influence diverse properties, providing deeper insights into the structure-property relationship.</div></div>","PeriodicalId":66474,"journal":{"name":"Green Chemical Engineering","volume":"6 1","pages":"Pages 85-92"},"PeriodicalIF":9.1,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140789223","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-03-01Epub Date: 2024-04-06DOI: 10.1016/j.gce.2024.04.001
Yansai Bao, Yang Wang, Chuanyu Yan, Zhimin Xue
Deep eutectic solvents (DESs) are recognized as an emerging green solvent that can be applied to lignocellulosic biomass fractionation and valorization. A deep understanding of the physicochemical properties of DESs is of great significance to the development of biomass processing technology. Meanwhile, the importance of DESs is manifested by an increasing number of value-added chemicals derived from lignocellulose in DESs. This review focuses on the physicochemical properties of different types of DESs as well as examples of their application to lignocellulosic fractionation. Additionally, recent advancements in research on converting products from DESs fractionation into bio-based materials are highlighted. Potential obstacles and prospects for integrating DESs into biomass processing are also discussed.
深共晶溶剂（DESs）被认为是一种新兴的绿色溶剂，可用于木质纤维素生物质的分馏和增值。深入了解 DESs 的物理化学特性对生物质加工技术的发展具有重要意义。同时，DESs 的重要性还表现在越来越多的增值化学品从 DESs 中的木质纤维素中提取出来。本综述重点介绍了不同类型 DES 的物理化学特性及其在木质纤维素分馏中的应用实例。此外，还重点介绍了将 DESs 分馏产品转化为生物基材料的最新研究进展。还讨论了将 DESs 纳入生物质加工的潜在障碍和前景。
{"title":"Deep eutectic solvents for fractionation and valorization of lignocellulose","authors":"Yansai Bao, Yang Wang, Chuanyu Yan, Zhimin Xue","doi":"10.1016/j.gce.2024.04.001","DOIUrl":"10.1016/j.gce.2024.04.001","url":null,"abstract":"<div><div>Deep eutectic solvents (DESs) are recognized as an emerging green solvent that can be applied to lignocellulosic biomass fractionation and valorization. A deep understanding of the physicochemical properties of DESs is of great significance to the development of biomass processing technology. Meanwhile, the importance of DESs is manifested by an increasing number of value-added chemicals derived from lignocellulose in DESs. This review focuses on the physicochemical properties of different types of DESs as well as examples of their application to lignocellulosic fractionation. Additionally, recent advancements in research on converting products from DESs fractionation into bio-based materials are highlighted. Potential obstacles and prospects for integrating DESs into biomass processing are also discussed.</div></div>","PeriodicalId":66474,"journal":{"name":"Green Chemical Engineering","volume":"6 1","pages":"Pages 21-35"},"PeriodicalIF":9.1,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140765455","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Solar-powered water splitting is an up-and-coming method for hydrogen production. Still, it faces several challenges, including improving light responsiveness, maximizing utilization of photocatalyst active sites, and effectively utilizing photo-induced carriers to prevent low hydrogen production. In this research, we propose an approach for designing a 2D/2D heterostructure catalyst, the Cd-TCPP(Pt)@CdS, which consists of 2D CdS nanosheets (NSs) and a 2D metal-organic framework (MOF) with Pt active sites (Cd-TCPP(Pt)), aiming to achieve highly efficient visible-light-driven hydrogen evolution. Firstly, CdS NSs exhibit excellent responsiveness to visible light, ensuring robust generation of photo-induced carriers. Secondly, the 2D MOF provides abundant Pt active sites, enhancing electron utilization and reducing the energy barrier for proton reduction. Compared to pure CdS NSs (which demonstrate a hydrogen production activity of 1220 μmol/g/h), the newly designed 2D/2D composite catalyst Cd-TCPP(Pt)@CdS exhibits an activity of 13,434 μmol/g/h, representing an 11-fold increase. Impressively, Cd-TCPP(Pt)@CdS maintains a high activity of 3062 μmol/g/h even under sunlight. Density functional theory (DFT) calculations were employed to investigate the principle of proton reduction. The suitable bandgap of CdS and energy gap of 2D Cd-TCPP(Pt) contribute to their strong interaction and consequently higher efficiency in hydrogen evolution. The Pt-single atom (Pt-SA) also provides sites with low free energy for proton reduction, contributing to improved activity. The photocatalytic performance of Cd-TCPP(Pt)@CdS NSs composites demonstrates a synergistic effect between the 2D inorganic semiconductor and the 2D MOF containing the Pt-site, resulting in enhanced utilization of photo-induced carriers and atoms.
{"title":"Boosting visible-light-driven hydrogen evolution through Pt site anchored 2D/2D heterostructure catalyst: Cd-TCPP(Pt)@CdS","authors":"Guo-Wei Guan, Yi-Tao Li, Li-Ping Zhang, Su-Tao Zheng, Si-Chao Liu, Hao-Ling Lan, Qing-Yuan Yang","doi":"10.1016/j.gce.2024.03.002","DOIUrl":"10.1016/j.gce.2024.03.002","url":null,"abstract":"<div><div>Solar-powered water splitting is an up-and-coming method for hydrogen production. Still, it faces several challenges, including improving light responsiveness, maximizing utilization of photocatalyst active sites, and effectively utilizing photo-induced carriers to prevent low hydrogen production. In this research, we propose an approach for designing a 2D/2D heterostructure catalyst, the Cd-TCPP(Pt)@CdS, which consists of 2D CdS nanosheets (NSs) and a 2D metal-organic framework (MOF) with Pt active sites (Cd-TCPP(Pt)), aiming to achieve highly efficient visible-light-driven hydrogen evolution. Firstly, CdS NSs exhibit excellent responsiveness to visible light, ensuring robust generation of photo-induced carriers. Secondly, the 2D MOF provides abundant Pt active sites, enhancing electron utilization and reducing the energy barrier for proton reduction. Compared to pure CdS NSs (which demonstrate a hydrogen production activity of 1220 μmol/g/h), the newly designed 2D/2D composite catalyst Cd-TCPP(Pt)@CdS exhibits an activity of 13,434 μmol/g/h, representing an 11-fold increase. Impressively, Cd-TCPP(Pt)@CdS maintains a high activity of 3062 μmol/g/h even under sunlight. Density functional theory (DFT) calculations were employed to investigate the principle of proton reduction. The suitable bandgap of CdS and energy gap of 2D Cd-TCPP(Pt) contribute to their strong interaction and consequently higher efficiency in hydrogen evolution. The Pt-single atom (Pt-SA) also provides sites with low free energy for proton reduction, contributing to improved activity. The photocatalytic performance of Cd-TCPP(Pt)@CdS NSs composites demonstrates a synergistic effect between the 2D inorganic semiconductor and the 2D MOF containing the Pt-site, resulting in enhanced utilization of photo-induced carriers and atoms.</div></div>","PeriodicalId":66474,"journal":{"name":"Green Chemical Engineering","volume":"6 1","pages":"Pages 68-75"},"PeriodicalIF":9.1,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140278325","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-03-01Epub Date: 2024-03-15DOI: 10.1016/j.gce.2024.03.001
Beihang Xu, Yao An, Jinghao Zhu, Yonglin He
The perception of light is crucial for humans to explore the external world. However, challenges of current planar photosensors include inherent limitations in depth of field and field of view. Flexible electronic devices offer a solution to this issue by allowing adaptation to curved surfaces, ensuring stable interfaces and excellent signal quality. Compared to photoelectric sensors, flexible photosensors based on photothermal conversion can respond to a wider spectrum of light, simplify design processes, and overcome issues such as instability and high toxicity. The review introduces progress on the flexible photosensors based on photothermal conversion, and summarizes the combination of photothermal conversion with pyroelectric, thermoelectric, and thermoresistive effects, allowing for the conversion of light signals into thermal signals and then into electric signals. Additionally, the review outlines the challenges for future research in this field.
{"title":"Flexible photosensors based on photothermal conversion","authors":"Beihang Xu, Yao An, Jinghao Zhu, Yonglin He","doi":"10.1016/j.gce.2024.03.001","DOIUrl":"10.1016/j.gce.2024.03.001","url":null,"abstract":"<div><div>The perception of light is crucial for humans to explore the external world. However, challenges of current planar photosensors include inherent limitations in depth of field and field of view. Flexible electronic devices offer a solution to this issue by allowing adaptation to curved surfaces, ensuring stable interfaces and excellent signal quality. Compared to photoelectric sensors, flexible photosensors based on photothermal conversion can respond to a wider spectrum of light, simplify design processes, and overcome issues such as instability and high toxicity. The review introduces progress on the flexible photosensors based on photothermal conversion, and summarizes the combination of photothermal conversion with pyroelectric, thermoelectric, and thermoresistive effects, allowing for the conversion of light signals into thermal signals and then into electric signals. Additionally, the review outlines the challenges for future research in this field.</div></div>","PeriodicalId":66474,"journal":{"name":"Green Chemical Engineering","volume":"6 1","pages":"Pages 6-20"},"PeriodicalIF":9.1,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140278531","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-03-01Epub Date: 2024-11-21DOI: 10.1016/S2666-9528(24)00079-7
{"title":"Outside Back Cover","authors":"","doi":"10.1016/S2666-9528(24)00079-7","DOIUrl":"10.1016/S2666-9528(24)00079-7","url":null,"abstract":"","PeriodicalId":66474,"journal":{"name":"Green Chemical Engineering","volume":"6 1","pages":"Page OBC"},"PeriodicalIF":9.1,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142704747","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
This study proposed a new cyclone separator, using a designed nozzle inside the traditional cyclone separator, which significantly improved the efficiency of separating fine particles while maintaining an essentially unchanged pressure drop. Firstly, computational fluid dynamics (CFD) was used to compare the flow characteristics of the new cyclone separator with those of the traditional cyclone separator. On this basis, this study comprehensively investigated the pressure drop and separation efficiency of two separators under varying working conditions. The new separator achieved a separation efficiency for particles with a particle size of 1 μm that was approximately 45% higher than that of the traditional separator when the inlet velocity was 2–10 m/s. Besides, the pressure drop of the cyclone separator remained unchanged while the separation efficiency increased by 46% at an inlet flow rate of 2 m/s. The influence of the outlet area of the nozzle inside the new cyclone separator on the separation efficiency and pressure drop was analyzed, and the outlet area of the nozzle with the best overall performance was determined. It was found that the overall performance of the new cyclone separator is optimal when the nozzle outlet area is S/f = 2 cm. Finally, an energy-saving cyclone separator with high separation efficiency was developed through an in-depth study of the variation of particle motion configuration with time. It is worth noting that this study provides a guidance for the flow field analysis and geometry optimization of new gas-solid separators, not limited to cyclone separators.
本研究提出了一种新型旋风分离器，它在传统旋风分离器内部设计了一个喷嘴，在保持压降基本不变的情况下，显著提高了分离细颗粒的效率。首先，利用计算流体动力学（CFD）比较了新型旋风分离器与传统旋风分离器的流动特性。在此基础上，本研究全面考察了两种分离器在不同工作条件下的压降和分离效率。当入口速度为 2-10 m/s 时，新型分离器对粒径为 1 μm 的颗粒的分离效率比传统分离器高出约 45%。此外，当入口流速为 2 m/s 时，旋风分离器的压降保持不变，而分离效率却提高了 46%。分析了新型旋风分离器内部喷嘴出口面积对分离效率和压降的影响，并确定了综合性能最佳的喷嘴出口面积。结果发现，当喷嘴出口面积为 S/f = 2 cm 时，新型旋风分离器的整体性能最佳。最后，通过深入研究颗粒运动构型随时间的变化，开发出一种具有高分离效率的节能旋风分离器。值得注意的是，本研究为新型气固分离器的流场分析和几何优化提供了指导，而不仅限于旋风分离器。
{"title":"Numerical study on performance optimization and flow mechanism of a new cyclone separator","authors":"Mengjing Feng , Chengmin Gui , Yangfan Zhou , Zhigang Lei","doi":"10.1016/j.gce.2024.03.006","DOIUrl":"10.1016/j.gce.2024.03.006","url":null,"abstract":"<div><div>This study proposed a new cyclone separator, using a designed nozzle inside the traditional cyclone separator, which significantly improved the efficiency of separating fine particles while maintaining an essentially unchanged pressure drop. Firstly, computational fluid dynamics (CFD) was used to compare the flow characteristics of the new cyclone separator with those of the traditional cyclone separator. On this basis, this study comprehensively investigated the pressure drop and separation efficiency of two separators under varying working conditions. The new separator achieved a separation efficiency for particles with a particle size of 1 μm that was approximately 45% higher than that of the traditional separator when the inlet velocity was 2–10 m/s. Besides, the pressure drop of the cyclone separator remained unchanged while the separation efficiency increased by 46% at an inlet flow rate of 2 m/s. The influence of the outlet area of the nozzle inside the new cyclone separator on the separation efficiency and pressure drop was analyzed, and the outlet area of the nozzle with the best overall performance was determined. It was found that the overall performance of the new cyclone separator is optimal when the nozzle outlet area is <em>S</em>/<em>f</em> = 2 cm. Finally, an energy-saving cyclone separator with high separation efficiency was developed through an in-depth study of the variation of particle motion configuration with time. It is worth noting that this study provides a guidance for the flow field analysis and geometry optimization of new gas-solid separators, not limited to cyclone separators.</div></div>","PeriodicalId":66474,"journal":{"name":"Green Chemical Engineering","volume":"6 1","pages":"Pages 76-84"},"PeriodicalIF":9.1,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140403664","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-12-01Epub Date: 2023-10-21DOI: 10.1016/j.gce.2023.10.004
Microalgae cultivation in photobioreactors (PBRs) has emerged as a promising and sustainable approach to address various environmental and energy challenges, offering a multitude of benefits across diverse applications. Recent developments in microalgae cultivation in photobioreactors have contributed substantially to the development and optimization of sustainable bioprocesses. This review presents a comprehensive analysis of recent innovations and breakthroughs in the field of microalgae cultivation, with a specific focus on their application in photobioreactors, aimed at paving the way for a greener future. This study in-depth examines the advantages of microalgae cultivation in photobioreactors, concentrating on its effectiveness in wastewater treatment, CO2 bioremediation, and the production of biofuels and high-value products. The review evaluates the effects of light, solar irradiation, temperature, nitrogen and phosphorus concentrations in culture media, CO2 concentrations, and pH on microalgae growth performance, including specific growth and biomass productivity. The study also examines open systems like unstirred ponds, raceway ponds, and circular ponds and closed systems like horizontal tubular, vertical bubble-column, airlift, flat panel, and plastic-bag photobioreactors, comparing their pros and cons. To optimize microalgae cultivation, key factors in photobioreactor design, including photosynthetic efficiencies, light/dark (L/D) cycles, CO2 concentrations, mass transfer, hydrodynamics behavior, and pH, are extensively investigated. In addition, the review outlines recent developments in large-scale photobioreactors and highlights the challenges and opportunities associated with photobioreactor scale-up and design parameter optimization, including genetic engineering and economic feasibility. This article is a vital resource for researchers, engineers, and industry professionals seeking sustainable bioprocesses and the application of microalgae-based technologies.
{"title":"Microalgae cultivation in photobioreactors: sustainable solutions for a greener future","authors":"","doi":"10.1016/j.gce.2023.10.004","DOIUrl":"10.1016/j.gce.2023.10.004","url":null,"abstract":"<div><p>Microalgae cultivation in photobioreactors (PBRs) has emerged as a promising and sustainable approach to address various environmental and energy challenges, offering a multitude of benefits across diverse applications. Recent developments in microalgae cultivation in photobioreactors have contributed substantially to the development and optimization of sustainable bioprocesses. This review presents a comprehensive analysis of recent innovations and breakthroughs in the field of microalgae cultivation, with a specific focus on their application in photobioreactors, aimed at paving the way for a greener future. This study in-depth examines the advantages of microalgae cultivation in photobioreactors, concentrating on its effectiveness in wastewater treatment, CO<sub>2</sub> bioremediation, and the production of biofuels and high-value products. The review evaluates the effects of light, solar irradiation, temperature, nitrogen and phosphorus concentrations in culture media, CO<sub>2</sub> concentrations, and pH on microalgae growth performance, including specific growth and biomass productivity. The study also examines open systems like unstirred ponds, raceway ponds, and circular ponds and closed systems like horizontal tubular, vertical bubble-column, airlift, flat panel, and plastic-bag photobioreactors, comparing their pros and cons. To optimize microalgae cultivation, key factors in photobioreactor design, including photosynthetic efficiencies, light/dark (L/D) cycles, CO<sub>2</sub> concentrations, mass transfer, hydrodynamics behavior, and pH, are extensively investigated. In addition, the review outlines recent developments in large-scale photobioreactors and highlights the challenges and opportunities associated with photobioreactor scale-up and design parameter optimization, including genetic engineering and economic feasibility. This article is a vital resource for researchers, engineers, and industry professionals seeking sustainable bioprocesses and the application of microalgae-based technologies.</p></div>","PeriodicalId":66474,"journal":{"name":"Green Chemical Engineering","volume":"5 4","pages":"Pages 418-439"},"PeriodicalIF":9.1,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2666952823000584/pdfft?md5=83b15a630bd327c6e3509a98c9c1fdba&pid=1-s2.0-S2666952823000584-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136009504","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-12-01Epub Date: 2024-02-02DOI: 10.1016/j.gce.2024.01.004
In the contemporary context, tetracycline is widely utilized as a prevalent antibiotic in various facets of life. However, the excessive use of antibiotics has caused visible environmental consequences. Henceforth, the scientific community has increasingly focused on developing catalysts that exhibit exceptional efficacy in the proficient degradation of tetracycline. In this study, a novel nanomaterial was developed to encapsulate CdTe quantum dots (QDs) with a SiO2 shell. The distinct synthesis approach generated a composite material that showed heterogeneity and considerably increased the contact area with contaminants. Consequently, the transfer of photoelectron to the SiO2 spheres was significantly improved, leading to a more efficient separation during the catalytic process. The study investigated how different factors, such as the loading of the catalyst, the initial concentration of tetracycline, pH levels, and the wight ratio of CdTe QDs (SiO2 + CdTe QDs) affected the effectiveness of photocatalytic tetracycline degradation. The findings indicated that the optimal degradation efficiency was observed at a catalyst concentration of 0.25 g/L and a solution pH of 9, leading to an impressive degradation rate of 96% within a mere 2 h timeframe.
{"title":"CdTe QDs@SiO2 composite material for efficient photocatalytic degradation of tetracycline composites","authors":"","doi":"10.1016/j.gce.2024.01.004","DOIUrl":"10.1016/j.gce.2024.01.004","url":null,"abstract":"<div><p>In the contemporary context, tetracycline is widely utilized as a prevalent antibiotic in various facets of life. However, the excessive use of antibiotics has caused visible environmental consequences. Henceforth, the scientific community has increasingly focused on developing catalysts that exhibit exceptional efficacy in the proficient degradation of tetracycline. In this study, a novel nanomaterial was developed to encapsulate CdTe quantum dots (QDs) with a SiO<sub>2</sub> shell. The distinct synthesis approach generated a composite material that showed heterogeneity and considerably increased the contact area with contaminants. Consequently, the transfer of photoelectron to the SiO<sub>2</sub> spheres was significantly improved, leading to a more efficient separation during the catalytic process. The study investigated how different factors, such as the loading of the catalyst, the initial concentration of tetracycline, pH levels, and the wight ratio of CdTe QDs (SiO<sub>2</sub> + CdTe QDs) affected the effectiveness of photocatalytic tetracycline degradation. The findings indicated that the optimal degradation efficiency was observed at a catalyst concentration of 0.25 g/L and a solution pH of 9, leading to an impressive degradation rate of 96% within a mere 2 h timeframe.</p></div>","PeriodicalId":66474,"journal":{"name":"Green Chemical Engineering","volume":"5 4","pages":"Pages 533-542"},"PeriodicalIF":9.1,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2666952824000049/pdfft?md5=982092b460fe833e27ca719fa42b006e&pid=1-s2.0-S2666952824000049-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139821346","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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