Low temperature mechanical properties of AZ91D magnesium alloy fabricated by solid recycling process from recycled scraps were studied. Various microstructural analyses were performed using optical microscopy （OM） a...Low temperature mechanical properties of AZ91D magnesium alloy fabricated by solid recycling process from recycled scraps were studied. Various microstructural analyses were performed using optical microscopy （OM） and scanning electron microscopy （SEM）. The recycled specimens consist of fine grains due to dynamic recrystallization and the interfaces of original individual scraps are not identified. Tensile tests were performed at a strain rate of 5 x 10 3 s 1 at room temperature （27 ~C）, -70, -100 and 130 ~C, respectively. Ultimate tensile strength of the specimens increases slightly with decreasing the tensile temperature, and elongation to failure decreases with decreasing the tensile temperature. The tensile specimens at -130 ~C show the highest ultimate tensile strength of 360.65 MPa and the lowest elongation to failure of 5.46%. Impact tests were performed at room temperature （27 ~C）, -70 and -130 ~C, respectively. Impact toughness decreases with decreasing the impact temperature. The impact specimens at -130 ~C show the lowest impact toughness of 3.06 J/cm2.展开更多
The development and research on the recycle demetallating process are introduced. It shows the recycle demetallating process is effective on removing metal elements in heavy crude oil, especially with regard to calciu...The development and research on the recycle demetallating process are introduced. It shows the recycle demetallating process is effective on removing metal elements in heavy crude oil, especially with regard to calcium, through commercial application in delayed coking unit. Finally, the ash content in petroleum coke can be decreased to less than 0.5%, which complies with the IB coke standard. At the same time, the recycle demetallating process is an environmentally friendly technique, which has little effect on production quality and equipment corrosion.展开更多
2,6-Diisopropylnaphthalene（2,6-DIPN）,as the precursor of important monomer 2,6-naphthalene dicarboxylic acid,was prepared by hydroisopropylation of refined naphthalene with propene over shape-selective catalyst.Naph...2,6-Diisopropylnaphthalene（2,6-DIPN）,as the precursor of important monomer 2,6-naphthalene dicarboxylic acid,was prepared by hydroisopropylation of refined naphthalene with propene over shape-selective catalyst.Naphthalene conversion of 92% and 2,6-DIPN selectivity of 64% were obtained.Static melt crystallization was applied to separate and purify 2,6-DIPN from its isomers,resulted in a product purity of≥99%.The other isomers were converted into monoisopropylnaphthalene,which also reacted with propene to form 2,6-DIPN.A recycled process including hydroisopropylation,separation and transalkylation was established,the yield of 2,6-DIPN based on naphthalene could be doubled by one cycle operation.展开更多
The growing number of decarbonization standards in the transportation sector has resulted in an increase in demand for electric cars.Renewable energy sources have the ability to bring the fossil fuel age to an end.Ele...The growing number of decarbonization standards in the transportation sector has resulted in an increase in demand for electric cars.Renewable energy sources have the ability to bring the fossil fuel age to an end.Electrochemical storage devices,particularly lithium-ion batteries,are critical for this transition’s success.This is owing to a combination of favorable characteristics such as high energy density and minimal self-discharge.Given the environmental degradation caused by hazardous wastes and the scarcity of some resources,recycling used lithium-ion batteries has significant economic and practical importance.Many efforts have been undertaken in recent years to recover cathode materials(such as high-value metals like cobalt,nickel,and lithium).Regrettably,the regeneration of lower-value-added anode materials(mostly graphite)has received little attention.However,given the widespread use of carbon-based materials and the higher concentration of lithium in the anode than in the environment,anode recycling has gotten a lot of attention.As a result,this article provides the most recent research progress in the recovery of graphite anode materials from spent lithium ion batteries,analyzing the strengths and weaknesses of various recovery routes such as direct physical recovery,heat treatment recovery,hydrometallurgy recovery,heat treatment-hydrometallurgy recovery,extraction,and electrochemical methods from the perspectives of energy,environment,and economy;additionally,the reuse of recycled anode mats is discussed.Finally,the problems and future possibilities of anode recycling are discussed.To enable the green recycling of wasted lithium ion batteries,a low energy-consuming and ecologically friendly solution should be investigated.展开更多
A novel process is reported which produces an asymmetric supercapacitor through the complete recycling of end-of-life lithium ion batteries.The electrodic powder recovered by industrial scale mechanical treatment of s...A novel process is reported which produces an asymmetric supercapacitor through the complete recycling of end-of-life lithium ion batteries.The electrodic powder recovered by industrial scale mechanical treatment of spent batteries was leached and the dissolved metals were precipitated as mixed metals carbonates.Nanowires battery-type positive electrodes were produced by electrodeposition into nanoporous alumina templates from the electrolytic baths prepared by dissolution of the precipitated carbonates.The impact of the different metals contained in the electrodic powder was evaluated by benchmarking the electrochemical performances of the recovered nanowires-based electrodes against electrodes produced by using high-purity salts.Presence of inactive Cu in the nanowires lowered the final capacitance of the electrodes while Ni showed a synergistic effect with cobalt providing a higher capacitance with respect to synthetic Co electrodes.The carbonaceous solid recovered after leaching was indepth characterized and tested as negative electrode.Both the chemical and electrochemical characterization indicate that the recovered graphite is characterized by the presence of oxygen functionalities introduced by the leaching treatment.This has led to the obtainment of a recovered graphite characterized by an XPS C/O ratio,Raman spectrum and morphology close to literature reports for reduced graphene oxide.The asymmetric supercapacitor assembled using the recovered nanowires-based positive electrodes and graphite as negative electrodes has shown a specific capacitance of 42 F g^(-1), computed including the whole weight of the positive electrode and recovered graphite,providing a maximum energy density of ~9 Wh kg^(-1) and a power density of 416 W kg^(-1) at 2.5 mA cm^(-2).展开更多
Fiber reinforced composite (FRC) requires a process of grinding, mixing and compounding natural fibers from cellulosic waste streams into a polymer matrix that creates a high-strength fiber composite. In this situatio...Fiber reinforced composite (FRC) requires a process of grinding, mixing and compounding natural fibers from cellulosic waste streams into a polymer matrix that creates a high-strength fiber composite. In this situation, the specified waste or base raw materials used are the waste thermoplastics and different types of cellulosic waste including rice husk and saw dust. FRC is a high-performance fiber composite achieved and made possible through a proprietary molecular re-engineering process by interlinking cellulosic fiber molecules with resins in the FRC material matrix, resulting in a product of exceptional structural properties. In this feat of molecular re-engineering, selected physical and structural properties of wood are effectively cloned and obtained in the FRC component, in addition to other essential qualities in order to produce superior performance properties to conventional wood. The dynamic characteristics of composite structures are largely extracted from the reinforcing of fibres. The fiber, held in place by the matrix resin, contributes to tensile strength in a composite, enhancing the performance properties in the final part, such as strength and rigidity, while minimizing weight. The advantages of composite materials always beat down their disadvantages. In this analysis, we tried to find out FRC advance manufacturing, recycling technology and future perspective for mankind and next generation development. This research will bring a new horizon for future science with FRC technology and every aspect of modern science which will bring a stable dimensional stability by recycling process with minimizing waste for environment and next generation science.展开更多
This study proposes two different methods of photocatalytic-controlled and visible light-induced selective oxidation of pyridiniums with air as the terminal oxidant.The key to these transformations is to choose the ap...This study proposes two different methods of photocatalytic-controlled and visible light-induced selective oxidation of pyridiniums with air as the terminal oxidant.The key to these transformations is to choose the appropriate light source and photocatalyst.Pyridiniums are successfully converted into pyrroles through oxygen-mediated cycloaddition,proton-coupled electron transfer(PCET),pyridine ring opening,and recyclization.The other route is that pyridiniums selectively form 4-carbonyl pyridines through free radical rearrangement/aerobic oxidation under the catalysis of cobalt(Ⅱ).展开更多
基金Projects(50674038,50974048)supported by the National Natural Science Foundation of ChinaProject(200802140004)supported by Doctoral Fund of Ministry of Education of China
文摘Low temperature mechanical properties of AZ91D magnesium alloy fabricated by solid recycling process from recycled scraps were studied. Various microstructural analyses were performed using optical microscopy （OM） and scanning electron microscopy （SEM）. The recycled specimens consist of fine grains due to dynamic recrystallization and the interfaces of original individual scraps are not identified. Tensile tests were performed at a strain rate of 5 x 10 3 s 1 at room temperature （27 ~C）, -70, -100 and 130 ~C, respectively. Ultimate tensile strength of the specimens increases slightly with decreasing the tensile temperature, and elongation to failure decreases with decreasing the tensile temperature. The tensile specimens at -130 ~C show the highest ultimate tensile strength of 360.65 MPa and the lowest elongation to failure of 5.46%. Impact tests were performed at room temperature （27 ~C）, -70 and -130 ~C, respectively. Impact toughness decreases with decreasing the impact temperature. The impact specimens at -130 ~C show the lowest impact toughness of 3.06 J/cm2.
文摘The development and research on the recycle demetallating process are introduced. It shows the recycle demetallating process is effective on removing metal elements in heavy crude oil, especially with regard to calcium, through commercial application in delayed coking unit. Finally, the ash content in petroleum coke can be decreased to less than 0.5%, which complies with the IB coke standard. At the same time, the recycle demetallating process is an environmentally friendly technique, which has little effect on production quality and equipment corrosion.
文摘2,6-Diisopropylnaphthalene（2,6-DIPN）,as the precursor of important monomer 2,6-naphthalene dicarboxylic acid,was prepared by hydroisopropylation of refined naphthalene with propene over shape-selective catalyst.Naphthalene conversion of 92% and 2,6-DIPN selectivity of 64% were obtained.Static melt crystallization was applied to separate and purify 2,6-DIPN from its isomers,resulted in a product purity of≥99%.The other isomers were converted into monoisopropylnaphthalene,which also reacted with propene to form 2,6-DIPN.A recycled process including hydroisopropylation,separation and transalkylation was established,the yield of 2,6-DIPN based on naphthalene could be doubled by one cycle operation.
基金Deanship of Scientific Research at Taif University for the grant received for this research.This research was supported by Taif University with research grant(TURSP-2020/77).
文摘The growing number of decarbonization standards in the transportation sector has resulted in an increase in demand for electric cars.Renewable energy sources have the ability to bring the fossil fuel age to an end.Electrochemical storage devices,particularly lithium-ion batteries,are critical for this transition’s success.This is owing to a combination of favorable characteristics such as high energy density and minimal self-discharge.Given the environmental degradation caused by hazardous wastes and the scarcity of some resources,recycling used lithium-ion batteries has significant economic and practical importance.Many efforts have been undertaken in recent years to recover cathode materials(such as high-value metals like cobalt,nickel,and lithium).Regrettably,the regeneration of lower-value-added anode materials(mostly graphite)has received little attention.However,given the widespread use of carbon-based materials and the higher concentration of lithium in the anode than in the environment,anode recycling has gotten a lot of attention.As a result,this article provides the most recent research progress in the recovery of graphite anode materials from spent lithium ion batteries,analyzing the strengths and weaknesses of various recovery routes such as direct physical recovery,heat treatment recovery,hydrometallurgy recovery,heat treatment-hydrometallurgy recovery,extraction,and electrochemical methods from the perspectives of energy,environment,and economy;additionally,the reuse of recycled anode mats is discussed.Finally,the problems and future possibilities of anode recycling are discussed.To enable the green recycling of wasted lithium ion batteries,a low energy-consuming and ecologically friendly solution should be investigated.
文摘A novel process is reported which produces an asymmetric supercapacitor through the complete recycling of end-of-life lithium ion batteries.The electrodic powder recovered by industrial scale mechanical treatment of spent batteries was leached and the dissolved metals were precipitated as mixed metals carbonates.Nanowires battery-type positive electrodes were produced by electrodeposition into nanoporous alumina templates from the electrolytic baths prepared by dissolution of the precipitated carbonates.The impact of the different metals contained in the electrodic powder was evaluated by benchmarking the electrochemical performances of the recovered nanowires-based electrodes against electrodes produced by using high-purity salts.Presence of inactive Cu in the nanowires lowered the final capacitance of the electrodes while Ni showed a synergistic effect with cobalt providing a higher capacitance with respect to synthetic Co electrodes.The carbonaceous solid recovered after leaching was indepth characterized and tested as negative electrode.Both the chemical and electrochemical characterization indicate that the recovered graphite is characterized by the presence of oxygen functionalities introduced by the leaching treatment.This has led to the obtainment of a recovered graphite characterized by an XPS C/O ratio,Raman spectrum and morphology close to literature reports for reduced graphene oxide.The asymmetric supercapacitor assembled using the recovered nanowires-based positive electrodes and graphite as negative electrodes has shown a specific capacitance of 42 F g^(-1), computed including the whole weight of the positive electrode and recovered graphite,providing a maximum energy density of ~9 Wh kg^(-1) and a power density of 416 W kg^(-1) at 2.5 mA cm^(-2).
文摘Fiber reinforced composite (FRC) requires a process of grinding, mixing and compounding natural fibers from cellulosic waste streams into a polymer matrix that creates a high-strength fiber composite. In this situation, the specified waste or base raw materials used are the waste thermoplastics and different types of cellulosic waste including rice husk and saw dust. FRC is a high-performance fiber composite achieved and made possible through a proprietary molecular re-engineering process by interlinking cellulosic fiber molecules with resins in the FRC material matrix, resulting in a product of exceptional structural properties. In this feat of molecular re-engineering, selected physical and structural properties of wood are effectively cloned and obtained in the FRC component, in addition to other essential qualities in order to produce superior performance properties to conventional wood. The dynamic characteristics of composite structures are largely extracted from the reinforcing of fibres. The fiber, held in place by the matrix resin, contributes to tensile strength in a composite, enhancing the performance properties in the final part, such as strength and rigidity, while minimizing weight. The advantages of composite materials always beat down their disadvantages. In this analysis, we tried to find out FRC advance manufacturing, recycling technology and future perspective for mankind and next generation development. This research will bring a new horizon for future science with FRC technology and every aspect of modern science which will bring a stable dimensional stability by recycling process with minimizing waste for environment and next generation science.
基金This work was supported by the National Natural Science Foundation of China(22061003,21861006)the Guangxi Natural Science Foundation of China(2016GXNSFEA380001,2019GXNSFAA245027)+2 种基金the Guangxi Key R&D Program(AB18221005)the Science and Technology Major Project of Guangxi(AA17204058-21)Guangxi Science and Technology Base and Special Talents(guike AD19110027).
文摘This study proposes two different methods of photocatalytic-controlled and visible light-induced selective oxidation of pyridiniums with air as the terminal oxidant.The key to these transformations is to choose the appropriate light source and photocatalyst.Pyridiniums are successfully converted into pyrroles through oxygen-mediated cycloaddition,proton-coupled electron transfer(PCET),pyridine ring opening,and recyclization.The other route is that pyridiniums selectively form 4-carbonyl pyridines through free radical rearrangement/aerobic oxidation under the catalysis of cobalt(Ⅱ).
