Pub Date : 2024-08-31DOI: 10.1016/j.gee.2024.08.008
Sirui Gao, Shunzheng Zhao, Xiaolong Tang, Long Sun, Qiyu Li, Honghong Yi
Researchers have recently developed various surface engineering approaches to modify environmental catalysts and improve their catalytic activity. Defect engineering has proved to be one of the most promising modification methods. Constructing defects on the surface of catalytic materials can effectively modulate the coordination environment of the active sites, affecting and changing the electrons, geometry, and other important properties at the catalytic active sites, thus altering the catalytic activity of the catalysts. However, the conformational relationship between defects and catalytic activity remains to be clarified. This dissertation focuses on an overview of recent advances in defect engineering in environmental catalysis. Based on defining the classification of defects in catalytic materials, defect construction methods, and characterization techniques are summarized and discussed. Focusing on an overview of the characteristics of the role of defects in electrocatalytic, photocatalytic, and thermal catalytic reactions and the mechanism of catalytic reactions. An elaborate link is given between the reaction activity and the structure of catalyst defects. Finally, the existing challenges and possible future directions for the application of defect engineering in environmental catalysis are discussed, which are expected to guide the design and development of efficient environmental catalysts and mechanism studies.
{"title":"Research on the application of defect engineering in the field of environmental catalysis","authors":"Sirui Gao, Shunzheng Zhao, Xiaolong Tang, Long Sun, Qiyu Li, Honghong Yi","doi":"10.1016/j.gee.2024.08.008","DOIUrl":"https://doi.org/10.1016/j.gee.2024.08.008","url":null,"abstract":"Researchers have recently developed various surface engineering approaches to modify environmental catalysts and improve their catalytic activity. Defect engineering has proved to be one of the most promising modification methods. Constructing defects on the surface of catalytic materials can effectively modulate the coordination environment of the active sites, affecting and changing the electrons, geometry, and other important properties at the catalytic active sites, thus altering the catalytic activity of the catalysts. However, the conformational relationship between defects and catalytic activity remains to be clarified. This dissertation focuses on an overview of recent advances in defect engineering in environmental catalysis. Based on defining the classification of defects in catalytic materials, defect construction methods, and characterization techniques are summarized and discussed. Focusing on an overview of the characteristics of the role of defects in electrocatalytic, photocatalytic, and thermal catalytic reactions and the mechanism of catalytic reactions. An elaborate link is given between the reaction activity and the structure of catalyst defects. Finally, the existing challenges and possible future directions for the application of defect engineering in environmental catalysis are discussed, which are expected to guide the design and development of efficient environmental catalysts and mechanism studies.","PeriodicalId":12744,"journal":{"name":"Green Energy & Environment","volume":null,"pages":null},"PeriodicalIF":13.3,"publicationDate":"2024-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142200001","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-08-31DOI: 10.1016/j.gee.2024.08.009
Jianmin Yu, Gongao Peng, Lishan Peng, Qingjun Chen, Chenliang Su, Lu Shang, Tierui Zhang
Hydrogen evolution reaction (HER) plays a crucial role in developing clean and renewable hydrogen energy technologies. However, conventional HER catalysts rely on expensive and scarce noble metals, which is a significant challenge for practical application. Recently, two-dimensional transition metal dichalcogenides (2D-TMDs) have emerged as attractive and cost-effective alternatives for efficient electrocatalysis in the HER. Substantial efforts have been dedicated to advancing the synthesis and application of 2D-TMDs. This review highlights the design and synthesis of high-performance 2D-TMDs-based HER electrocatalysts by combining theoretical calculations with experimental methods. Subsequently, recent advances in synthesizing different types of 2D TMDs with enhanced HER activity are summarized. Finally, the conclusion and perspectives of the 2D TMDs-based HER electrocatalysts are discussed. We expect that this review will provide new insights into the design and development of highly efficient 2D TMDs-based HER electrocatalysts for industrial applications.
氢进化反应（HER）在开发清洁和可再生氢能技术方面发挥着至关重要的作用。然而，传统的氢进化反应催化剂依赖于昂贵而稀缺的贵金属，这对实际应用是一个重大挑战。最近，二维过渡金属二钙化物（2D-TMDs）作为具有吸引力和成本效益的替代品出现了，可用于 HER 的高效电催化。人们一直致力于推进二维过渡金属二钙化物的合成和应用。本综述将理论计算与实验方法相结合，重点介绍基于二维-TMDs 的高性能 HER 电催化剂的设计与合成。随后，总结了合成具有增强 HER 活性的不同类型二维 TMDs 的最新进展。最后，讨论了基于二维 TMDs 的 HER 电催化剂的结论和前景。我们希望本综述能为工业应用中基于二维 TMDs 的高效 HER 电催化剂的设计和开发提供新的见解。
{"title":"Recent advancements in two-dimensional transition metal dichalcogenide materials towards hydrogen-evolution electrocatalysis","authors":"Jianmin Yu, Gongao Peng, Lishan Peng, Qingjun Chen, Chenliang Su, Lu Shang, Tierui Zhang","doi":"10.1016/j.gee.2024.08.009","DOIUrl":"https://doi.org/10.1016/j.gee.2024.08.009","url":null,"abstract":"Hydrogen evolution reaction (HER) plays a crucial role in developing clean and renewable hydrogen energy technologies. However, conventional HER catalysts rely on expensive and scarce noble metals, which is a significant challenge for practical application. Recently, two-dimensional transition metal dichalcogenides (2D-TMDs) have emerged as attractive and cost-effective alternatives for efficient electrocatalysis in the HER. Substantial efforts have been dedicated to advancing the synthesis and application of 2D-TMDs. This review highlights the design and synthesis of high-performance 2D-TMDs-based HER electrocatalysts by combining theoretical calculations with experimental methods. Subsequently, recent advances in synthesizing different types of 2D TMDs with enhanced HER activity are summarized. Finally, the conclusion and perspectives of the 2D TMDs-based HER electrocatalysts are discussed. We expect that this review will provide new insights into the design and development of highly efficient 2D TMDs-based HER electrocatalysts for industrial applications.","PeriodicalId":12744,"journal":{"name":"Green Energy & Environment","volume":null,"pages":null},"PeriodicalIF":13.3,"publicationDate":"2024-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142199999","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-08-23DOI: 10.1016/j.gee.2024.08.005
Hongju Lin, Xiyan Chen, Yanchang Chu, Jie Fu, Le Yang
The valorization of biomass to produce biofuels has become a heavily investigated field due to the depletion of fossil fuels and environmental concerns. Among them, the research on deoxygenation of fatty acids or esters derived from biomass as well as municipal sludge organics to produce diesel-like hydrocarbons has become a hot topic. Fatty acid is a key intermediate derived from ester hydrolysis, therefore has attracted more attention as a model compound. In this review, we first introduce and compare the three reaction pathways of hydrodeoxygenation, decarboxylation and decarbonylation, for the deoxygenation of fatty acids and esters. The preference of reaction pathway is closely related to the type of raw materials and catalysts as well as reaction conditions. The special purpose of this review is to summarize the dilemma and possible strategies for deoxygenation of fatty acids, which is expected to provide guidance for future exploration and concentrates. The atom utilization along with stability during reaction in a long time is the most important index for commercial economy. Herein, we propose that the rational design and delicate synthesis of stable single-atom non-noble catalysts may be the best solution. The ultimately goal is aiming to develop sustainable production of green diesel hydrocarbons.
{"title":"Dilemma and strategies for production of diesel-like hydrocarbons by deoxygenation of biomass-derived fatty acids","authors":"Hongju Lin, Xiyan Chen, Yanchang Chu, Jie Fu, Le Yang","doi":"10.1016/j.gee.2024.08.005","DOIUrl":"https://doi.org/10.1016/j.gee.2024.08.005","url":null,"abstract":"The valorization of biomass to produce biofuels has become a heavily investigated field due to the depletion of fossil fuels and environmental concerns. Among them, the research on deoxygenation of fatty acids or esters derived from biomass as well as municipal sludge organics to produce diesel-like hydrocarbons has become a hot topic. Fatty acid is a key intermediate derived from ester hydrolysis, therefore has attracted more attention as a model compound. In this review, we first introduce and compare the three reaction pathways of hydrodeoxygenation, decarboxylation and decarbonylation, for the deoxygenation of fatty acids and esters. The preference of reaction pathway is closely related to the type of raw materials and catalysts as well as reaction conditions. The special purpose of this review is to summarize the dilemma and possible strategies for deoxygenation of fatty acids, which is expected to provide guidance for future exploration and concentrates. The atom utilization along with stability during reaction in a long time is the most important index for commercial economy. Herein, we propose that the rational design and delicate synthesis of stable single-atom non-noble catalysts may be the best solution. The ultimately goal is aiming to develop sustainable production of green diesel hydrocarbons.","PeriodicalId":12744,"journal":{"name":"Green Energy & Environment","volume":null,"pages":null},"PeriodicalIF":13.3,"publicationDate":"2024-08-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142200004","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-08-23DOI: 10.1016/j.gee.2024.08.006
Amaranadha Reddy Manchuri, Kamakshaiah Charyulu Devarayapalli, Bolam Kim, Youngsu Lim, Dae Sung Lee
Developing an efficient electrocatalyst for superior electrochemical water splitting (EWS) is crucial for achieving comprehensive hydrogen production. A heterostructured electrocatalyst, free of noble metals, TiC MXene nanosheet-integrated cobalt-doped nickel hydroxide (NHCoMX) composite was synthesized via a hydrothermal method. The abundant pores in the TiC MXene nanosheet (MX)–integrated microarchitecture increased the number of active sites and facilitated charge transfer, thus enhancing electrocatalysis. Specifically, the MX-enhanced charge transfer considerably transformed the microelectronic structure of cobalt-doped Ni(OH) (NHCo), which promoted its hydrogen evolution reaction (HER) and oxygen evolution reaction (OER). Hence, as an EWS catalyst, NHCoMX exhibited an exceptional electrocatalytic activity, demonstrating OER and HER overpotentials of 310 mV and 73 mV, respectively, with low Tafel slopes of 65 mV dec and 85 mV dec, respectively; it exhibited a current density of 10 mV cm in 1.0 mol L KOH, representing the closest efficiency to the noble state-of-the-art RuO and Pt/C catalyst. Furthermore, the developed electrocatalyst improved the activities of both HER and OER, leading to an overall EWS current density of 10 mA cm at 1.72 V in an alkaline electrolyte with two electrodes. This study describes an efficient heterostructured NHCoMX composite electrocatalyst. It is significantly comparable to the noble state-of-the-art electrocatalysts and can be extended to fabricate resourceful catalysts for large-scale EWS applications.
开发一种高效的电催化剂以实现卓越的电化学水分离（EWS），对于实现全面制氢至关重要。通过水热法合成了一种不含贵金属的异质结构电催化剂--TiC MXene 纳米片集成掺钴氢氧化镍（NHCoMX）复合材料。TiC MXene 纳米片（MX）集成微结构中丰富的孔隙增加了活性位点的数量，促进了电荷转移，从而增强了电催化能力。具体来说，MX 增强电荷转移大大改变了掺钴 Ni（OH）（NHCo）的微电子结构，促进了其氢进化反应（HER）和氧进化反应（OER）。因此，作为一种 EWS 催化剂，NHCoMX 表现出了非凡的电催化活性，其 OER 和 HER 过电位分别为 310 mV 和 73 mV，Tafel 斜率分别为 65 mV dec 和 85 mV dec；在 1.0 mol L KOH 中的电流密度为 10 mV cm，与最先进的贵金属 RuO 和 Pt/C 催化剂的效率最为接近。此外，所开发的电催化剂还提高了 HER 和 OER 的活性，在双电极碱性电解质中，1.72 V 时的整体 EWS 电流密度为 10 mA cm。本研究介绍了一种高效的异质结构 NHCoMX 复合电催化剂。该催化剂与最先进的贵金属电催化剂具有明显的可比性，并可扩展到为大规模 EWS 应用制造资源丰富的催化剂。
{"title":"Ti3C2 MXene nanosheets integrated cobalt-doped nickel hydroxide heterostructured composite: An efficient electrocatalyst for overall water-splitting","authors":"Amaranadha Reddy Manchuri, Kamakshaiah Charyulu Devarayapalli, Bolam Kim, Youngsu Lim, Dae Sung Lee","doi":"10.1016/j.gee.2024.08.006","DOIUrl":"https://doi.org/10.1016/j.gee.2024.08.006","url":null,"abstract":"Developing an efficient electrocatalyst for superior electrochemical water splitting (EWS) is crucial for achieving comprehensive hydrogen production. A heterostructured electrocatalyst, free of noble metals, TiC MXene nanosheet-integrated cobalt-doped nickel hydroxide (NHCoMX) composite was synthesized via a hydrothermal method. The abundant pores in the TiC MXene nanosheet (MX)–integrated microarchitecture increased the number of active sites and facilitated charge transfer, thus enhancing electrocatalysis. Specifically, the MX-enhanced charge transfer considerably transformed the microelectronic structure of cobalt-doped Ni(OH) (NHCo), which promoted its hydrogen evolution reaction (HER) and oxygen evolution reaction (OER). Hence, as an EWS catalyst, NHCoMX exhibited an exceptional electrocatalytic activity, demonstrating OER and HER overpotentials of 310 mV and 73 mV, respectively, with low Tafel slopes of 65 mV dec and 85 mV dec, respectively; it exhibited a current density of 10 mV cm in 1.0 mol L KOH, representing the closest efficiency to the noble state-of-the-art RuO and Pt/C catalyst. Furthermore, the developed electrocatalyst improved the activities of both HER and OER, leading to an overall EWS current density of 10 mA cm at 1.72 V in an alkaline electrolyte with two electrodes. This study describes an efficient heterostructured NHCoMX composite electrocatalyst. It is significantly comparable to the noble state-of-the-art electrocatalysts and can be extended to fabricate resourceful catalysts for large-scale EWS applications.","PeriodicalId":12744,"journal":{"name":"Green Energy & Environment","volume":null,"pages":null},"PeriodicalIF":13.3,"publicationDate":"2024-08-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142200002","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-08-16DOI: 10.1016/j.gee.2024.08.004
Li Sun, Lujia Chai, Liangqi Jing, Yujuan Chen, Kelei Zhuo, Jianji Wang
Due to insufficient energy density, supercapacitors (SCs) with preeminent-power and long cycle stability cannot be implemented in some practical applications. Exploring hybrid materials with redox activity to emerge high specific capacitance in ionic liquid (IL) electrolytes can solve this problem. Herein, we report a redox-organic molecule 2,6-diaminoanthraquinone (DAAQ) modified MXene (TiCT)/Graphene (DAAQ-M/G) composite material. With the assist of graphene oxide (GO), MXene and graphene fabricate a three-dimensional (3D) interconnected structure as a conductive framework, which inhibits self-stacking of MXene monolayers and ensures high electronic conductivity. Meanwhile, DAAQ is loaded onto the M/G framework through covalent/non-covalent functionalization. The DAAQ as a spacer effectively enlarges the interlayer spacing of MXene nanosheets, and meanwhile produces reversible redox reactions during charge/discharge processes to provide additional Faradaic contribution to capacity. Therefore, the specific capacitance (capacity) of the DAAQ-M/G as the negative electrode material reaches to 226 F g (306 C g) at 1 A g in 1-ethyl-3-methylimidazolium tetrafluoroborate (EmimBF) electrolyte. Furthermore, an asymmetric supercapacitor (ASC) is assembled using DAAQ-M/G as the negative electrode and self-prepared organic molecule hydroquinone modified reduced graphene oxide (HQ-RGO) material as the positive electrode, with a high energy density of 43 Wh kg at high power density of 1669 W kg. The ASC can maintain 80% of initial specific capacitance after 9000 cycles. This research can provide better support to develop advanced organic molecules-modified MXene composite materials for ionic liquid-based SCs.
由于能量密度不足，具有卓越功率和长周期稳定性的超级电容器（SC）在某些实际应用中无法实现。探索具有氧化还原活性的混合材料，在离子液体（IL）电解质中产生高比电容，可以解决这一问题。在此，我们报告了一种氧化还原有机分子 2,6-二氨基蒽醌（DAAQ）修饰的 MXene（TiCT）/石墨烯（DAAQ-M/G）复合材料。在氧化石墨烯（GO）的辅助下，MXene 和石墨烯形成了三维（3D）互连结构作为导电框架，从而抑制了 MXene 单层的自堆积，确保了高电子导电性。同时，通过共价/非共价官能化将 DAAQ 加载到 M/G 框架上。作为间隔物的 DAAQ 有效地扩大了 MXene 纳米片的层间间距，同时在充放电过程中产生可逆的氧化还原反应，为电容提供额外的法拉第贡献。因此，在 1-ethyl-3-methylimidazolium tetrafluoroborate (EmimBF) 电解液中，DAAQ-M/G 作为负极材料的比电容（容量）在 1 A g 时达到 226 F g (306 C g)。此外，以 DAAQ-M/G 为负极，以自制备的有机分子对苯二酚修饰的还原型氧化石墨烯（HQ-RGO）材料为正极，组装了不对称超级电容器（ASC），在 1669 W kg 的高功率密度下，能量密度高达 43 Wh kg。ASC 可在 9000 次循环后保持初始比电容的 80%。这项研究可为开发先进的有机分子改性 MXene 复合材料提供更好的支持，用于离子液体型 SC。
{"title":"2,6-Diaminoanthraquinone modified MXene (Ti3C2Tx)/graphene as the negative electrode materials for ionic liquid-based asymmetric supercapacitors","authors":"Li Sun, Lujia Chai, Liangqi Jing, Yujuan Chen, Kelei Zhuo, Jianji Wang","doi":"10.1016/j.gee.2024.08.004","DOIUrl":"https://doi.org/10.1016/j.gee.2024.08.004","url":null,"abstract":"Due to insufficient energy density, supercapacitors (SCs) with preeminent-power and long cycle stability cannot be implemented in some practical applications. Exploring hybrid materials with redox activity to emerge high specific capacitance in ionic liquid (IL) electrolytes can solve this problem. Herein, we report a redox-organic molecule 2,6-diaminoanthraquinone (DAAQ) modified MXene (TiCT)/Graphene (DAAQ-M/G) composite material. With the assist of graphene oxide (GO), MXene and graphene fabricate a three-dimensional (3D) interconnected structure as a conductive framework, which inhibits self-stacking of MXene monolayers and ensures high electronic conductivity. Meanwhile, DAAQ is loaded onto the M/G framework through covalent/non-covalent functionalization. The DAAQ as a spacer effectively enlarges the interlayer spacing of MXene nanosheets, and meanwhile produces reversible redox reactions during charge/discharge processes to provide additional Faradaic contribution to capacity. Therefore, the specific capacitance (capacity) of the DAAQ-M/G as the negative electrode material reaches to 226 F g (306 C g) at 1 A g in 1-ethyl-3-methylimidazolium tetrafluoroborate (EmimBF) electrolyte. Furthermore, an asymmetric supercapacitor (ASC) is assembled using DAAQ-M/G as the negative electrode and self-prepared organic molecule hydroquinone modified reduced graphene oxide (HQ-RGO) material as the positive electrode, with a high energy density of 43 Wh kg at high power density of 1669 W kg. The ASC can maintain 80% of initial specific capacitance after 9000 cycles. This research can provide better support to develop advanced organic molecules-modified MXene composite materials for ionic liquid-based SCs.","PeriodicalId":12744,"journal":{"name":"Green Energy & Environment","volume":null,"pages":null},"PeriodicalIF":13.3,"publicationDate":"2024-08-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142200003","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Mineral carbonation is a promising CO sequestration strategy that can utilize industrial wastes to convert CO into high-value CaCO. This review summarizes the advancements in CO mineralization using typical industrial wastes to prepare ultrafine CaCO. This work surveys the mechanisms of CO mineralization using these wastes and its capacities to synthesize CaCO, evaluates the effects of carbonation pathways and operating parameters on the preparation of CaCO, analyzes the current industrial application status and economics of this technology. Due to the large amount of impurities in solid wastes, the purity of CaCO prepared by indirect methods is greater than that prepared by direct methods. Crystalline CaCO includes three polymorphs. The polymorph of CaCO synthesized by carbonation process is determined the combined effects of various factors. These parameters essentially impact the nucleation and growth of CaCO by altering the CO supersaturation in the reaction system and the surface energy of CaCO grains. Increasing the initial pH of the solution and the CO flow rate favors the formation of vaterite, but calcite is formed under excessively high pH. Vaterite formation is favored at lower temperatures and residence time. With increased temperature and prolonged residence time, it passes through aragonite metastable phase and eventually transforms into calcite. Moreover, polymorph modifiers can decrease the surface energy of CaCO grains, facilitating the synthesis of vaterite. However, the large-scale application of this technology still faces many problems, including high costs, high energy consumption, low calcium leaching rate, low carbonation efficiency, and low product yield. Therefore, it is necessary to investigate ways to accelerate carbonation, optimize operating parameters, develop cost-effective agents, and understand the kinetics of CaCO nucleation and crystallization to obtain products with specific crystal forms. Furthermore, more studies on life cycle assessment (LCA) should be conducted to fully confirm the feasibility of the developed technologies.
{"title":"CO2 mineralization by typical industrial solid wastes for preparing ultrafine CaCO3: A review","authors":"Run Xu, Fuxia Zhu, Liang Zou, Shuqing Wang, Yanfang Liu, Jili Hou, Chenghao Li, Kuntong Song, Lingzhao Kong, Longpeng Cui, Zhiqiang Wang","doi":"10.1016/j.gee.2024.08.002","DOIUrl":"https://doi.org/10.1016/j.gee.2024.08.002","url":null,"abstract":"Mineral carbonation is a promising CO sequestration strategy that can utilize industrial wastes to convert CO into high-value CaCO. This review summarizes the advancements in CO mineralization using typical industrial wastes to prepare ultrafine CaCO. This work surveys the mechanisms of CO mineralization using these wastes and its capacities to synthesize CaCO, evaluates the effects of carbonation pathways and operating parameters on the preparation of CaCO, analyzes the current industrial application status and economics of this technology. Due to the large amount of impurities in solid wastes, the purity of CaCO prepared by indirect methods is greater than that prepared by direct methods. Crystalline CaCO includes three polymorphs. The polymorph of CaCO synthesized by carbonation process is determined the combined effects of various factors. These parameters essentially impact the nucleation and growth of CaCO by altering the CO supersaturation in the reaction system and the surface energy of CaCO grains. Increasing the initial pH of the solution and the CO flow rate favors the formation of vaterite, but calcite is formed under excessively high pH. Vaterite formation is favored at lower temperatures and residence time. With increased temperature and prolonged residence time, it passes through aragonite metastable phase and eventually transforms into calcite. Moreover, polymorph modifiers can decrease the surface energy of CaCO grains, facilitating the synthesis of vaterite. However, the large-scale application of this technology still faces many problems, including high costs, high energy consumption, low calcium leaching rate, low carbonation efficiency, and low product yield. Therefore, it is necessary to investigate ways to accelerate carbonation, optimize operating parameters, develop cost-effective agents, and understand the kinetics of CaCO nucleation and crystallization to obtain products with specific crystal forms. Furthermore, more studies on life cycle assessment (LCA) should be conducted to fully confirm the feasibility of the developed technologies.","PeriodicalId":12744,"journal":{"name":"Green Energy & Environment","volume":null,"pages":null},"PeriodicalIF":13.3,"publicationDate":"2024-08-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142200006","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-08-08DOI: 10.1016/j.gee.2024.08.001
Shaoxin Li, Jiajin Liu, Zhong Lin Wang, Di Wei
Traditional chemical processes often generate substantial waste, leading to significant pollution of water, air, and soil. Developing eco-friendly chemical methods is crucial for economic and environmental sustainability. Mechano-driven chemistry, with its potential for material recyclability and minimal byproducts, is well-aligned with green chemistry principles. Despite its origins over 2000 years ago and nearly 200 years of scientific investigation, mechano-driven chemistry has not been widely implemented in practice. This is likely due to a lack of comprehensive understanding and the complex physical effects of mechanical forces, which challenge reaction efficiency and scalability. This review summarizes the historical development of mechano-driven chemistry and discusses its progress across various physical mechanisms, including mechanochemistry, tribochemistry, piezochemistry, and contact electrification (CE) chemistry. CE-induced chemical reactions, involving ion transfer, electron transfer, and radical generation, are detailed, emphasizing the dominant role of radicals initiated by electron transfer and the influence of ion transfer through electrical double layer (EDL) formation. Advancing efficient, eco-friendly, and controllable green chemical technologies can reduce reliance on traditional energy sources (such as electricity and heat) and toxic chemical reagents, fostering innovation in material synthesis, catalytic technologies, and establishing a new paradigm for broader chemical applications.
{"title":"Mechano-driven chemical reactions","authors":"Shaoxin Li, Jiajin Liu, Zhong Lin Wang, Di Wei","doi":"10.1016/j.gee.2024.08.001","DOIUrl":"https://doi.org/10.1016/j.gee.2024.08.001","url":null,"abstract":"Traditional chemical processes often generate substantial waste, leading to significant pollution of water, air, and soil. Developing eco-friendly chemical methods is crucial for economic and environmental sustainability. Mechano-driven chemistry, with its potential for material recyclability and minimal byproducts, is well-aligned with green chemistry principles. Despite its origins over 2000 years ago and nearly 200 years of scientific investigation, mechano-driven chemistry has not been widely implemented in practice. This is likely due to a lack of comprehensive understanding and the complex physical effects of mechanical forces, which challenge reaction efficiency and scalability. This review summarizes the historical development of mechano-driven chemistry and discusses its progress across various physical mechanisms, including mechanochemistry, tribochemistry, piezochemistry, and contact electrification (CE) chemistry. CE-induced chemical reactions, involving ion transfer, electron transfer, and radical generation, are detailed, emphasizing the dominant role of radicals initiated by electron transfer and the influence of ion transfer through electrical double layer (EDL) formation. Advancing efficient, eco-friendly, and controllable green chemical technologies can reduce reliance on traditional energy sources (such as electricity and heat) and toxic chemical reagents, fostering innovation in material synthesis, catalytic technologies, and establishing a new paradigm for broader chemical applications.","PeriodicalId":12744,"journal":{"name":"Green Energy & Environment","volume":null,"pages":null},"PeriodicalIF":13.3,"publicationDate":"2024-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142225711","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
An innovative strategy was proposed by integration of membrane contactor (MC) with biphasic solvent for efficient CO capture from flue gas. The accessible fly ash-based ceramic membrane (CM) underwent hydrophobic modification through silane grafting, followed by fluoroalkylsilane decoration, to prepare the superhydrophobic membrane (CSCM). The CSCM significantly improved resistance to wetting by the biphasic solvent, consisting of amine (DETA) and sulfolane (TMS). Morphological characterizations and chemical analysis revealed the notable enhancements in pore structure and hydrophobic chemical groups for the modified membrane. Predictions of wetting/bubbling behavior based on static wetting theory referred the liquid entry pressure (LEP) of CSCM increased by 20 kPa compared to pristine CM. Compared with traditional amine solvents, the biphasic solvent presented the expected phase separation. Performance experiments demonstrated that the CO capture efficiency of the biphasic solvent increased by 7%, and the electrical energy required for desorption decreased by 32%. The 60-h continuous testing and supplemental characterization of used membrane confirmed the excellent adaptability and durability of the CSCMs. This study provides a potential approach for accessing hydrophobic ceramic membranes and biphasic solvents for industrial CO capture.
通过将膜接触器（MC）与双相溶剂相结合，提出了一种从烟道气中高效捕集一氧化碳的创新策略。通过硅烷接枝对可获得的粉煤灰基陶瓷膜（CM）进行疏水改性，然后进行氟烷基硅烷装饰，制备出超疏水膜（CSCM）。CSCM 大大提高了抗双相溶剂（由胺（DETA）和砜（TMS）组成）润湿的能力。形态特征和化学分析显示，改性膜的孔隙结构和疏水化学基团明显改善。基于静态润湿理论的润湿/气泡行为预测表明，与原始 CM 相比，CSCM 的液体进入压力 (LEP) 增加了 20 kPa。与传统胺溶剂相比，双相溶剂呈现出预期的相分离现象。性能实验表明，双相溶剂的一氧化碳捕获效率提高了 7%，解吸所需的电能降低了 32%。对使用过的膜进行的 60 小时连续测试和补充表征证实了 CSCM 的出色适应性和耐用性。这项研究为利用疏水陶瓷膜和双相溶剂捕获工业 CO 提供了一种潜在的方法。
{"title":"Superhydrophobic ceramic membrane coupled with a biphasic solvent for efficient CO2 capture","authors":"Kaili Xue, Zhen Chen, Xiaona Wu, Heng Zhang, Haiping Chen, Junhua Li","doi":"10.1016/j.gee.2024.07.010","DOIUrl":"https://doi.org/10.1016/j.gee.2024.07.010","url":null,"abstract":"An innovative strategy was proposed by integration of membrane contactor (MC) with biphasic solvent for efficient CO capture from flue gas. The accessible fly ash-based ceramic membrane (CM) underwent hydrophobic modification through silane grafting, followed by fluoroalkylsilane decoration, to prepare the superhydrophobic membrane (CSCM). The CSCM significantly improved resistance to wetting by the biphasic solvent, consisting of amine (DETA) and sulfolane (TMS). Morphological characterizations and chemical analysis revealed the notable enhancements in pore structure and hydrophobic chemical groups for the modified membrane. Predictions of wetting/bubbling behavior based on static wetting theory referred the liquid entry pressure (LEP) of CSCM increased by 20 kPa compared to pristine CM. Compared with traditional amine solvents, the biphasic solvent presented the expected phase separation. Performance experiments demonstrated that the CO capture efficiency of the biphasic solvent increased by 7%, and the electrical energy required for desorption decreased by 32%. The 60-h continuous testing and supplemental characterization of used membrane confirmed the excellent adaptability and durability of the CSCMs. This study provides a potential approach for accessing hydrophobic ceramic membranes and biphasic solvents for industrial CO capture.","PeriodicalId":12744,"journal":{"name":"Green Energy & Environment","volume":null,"pages":null},"PeriodicalIF":13.3,"publicationDate":"2024-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141935020","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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