The rare earth elements(REEs)extraction by chemical leaching from ion-adsorption type rare earth ores(IAREO)has led to serious ecological and environmental risks.Conversely,demand for bioleaching is on the rise with t...The rare earth elements(REEs)extraction by chemical leaching from ion-adsorption type rare earth ores(IAREO)has led to serious ecological and environmental risks.Conversely,demand for bioleaching is on the rise with the advantage of being environmental-friendly.As one of the organic acids produced by biological metabolism,citric acid was used to leach REEs and explore the performance and process.The results demonstrate that citric acid exhibits higher leaching efficiency(96.00%)for REEs at a relatively low concentration of 0.01 mol/L compared with(NH_(4))_(2)SO_(4)(84.29%,0.1 mol/L)and MgSO_(4)(83.99%,0.1 mol/L).Citric acid shows a preference for leaching heavy rare earth elements,with 99%leaching efficiency in IAREO,which shows higher capacity than(NH_(4))_(2)SO_(4)and MgSO_(4)(as inorganic leaching agents).Kinetic analysis indicates that the leaching process of REEs with citric acid is controlled by both the internal diffusion kinetics and chemical reaction kinetics,which is different from inorganic leaching agents.Visual Minteq calculations confirm that RE-Citrate is the main constituent of the extract solution in the leaching process of the IAREO,thereby enhancing the leaching efficiency of REEs from the IAREO.It suggests that citric acid may be used as a promising organic leaching agent for the environmentalfriendly extraction of REEs from IAREO.展开更多
Dr.Chen Jiayong(Chia-Yung)was born on Feb.17,1922 in a prestigous intellectual clan at Jintang County,Sichuan Province,China.After receiving early education at the Chengdu County Middle School(now Chengdu 7th School),...Dr.Chen Jiayong(Chia-Yung)was born on Feb.17,1922 in a prestigous intellectual clan at Jintang County,Sichuan Province,China.After receiving early education at the Chengdu County Middle School(now Chengdu 7th School),he was admitted as an undergraduate student to the Department of Chemical Engineering,the National Central University at the city of Chongqing from 1939 through 1943 during the Anti-Japanese War.After graduation,he continued to work as a teaching assistant for both the inorganic and organic chemistry courses.展开更多
In order to co-immobilize multiple enzymes,a wide range of nanomaterials has been designed to achieve synergistic enzyme activity and enhance catalytic efficiency.Nanomaterials,as carriers for enzyme co-immobilization...In order to co-immobilize multiple enzymes,a wide range of nanomaterials has been designed to achieve synergistic enzyme activity and enhance catalytic efficiency.Nanomaterials,as carriers for enzyme co-immobilization,possess various advantages such as tunable morphology and size,high specific surface area,and abundant chemically active sites.They can significantly enhance enzyme stability,activity,and catalytic efficiency.We overview the commonly used methods and strategies of enzyme co-immobilization.This review further summarizes the latest research advances in nanomaterials for enzyme coimmobilization applications over the past 5 years.Meanwhile,the advantages and challenges of these nanomaterials used for enzyme co-immobilization as well as some potential future directions are also discussed.展开更多
基金Project supported by the Thousand Talents Program of Jiangxi Province,China(JXSQ2023201003)National Natural Science Foundation of China(42107254)+4 种基金Science and Technology Major Program of Ordos City(2022EEDSKJZDZX014-2)Technological Innovation Guidance Program of Jiangxi Province(20212BDH81029)Rare Earth Industry Fund(IAGM2020DB06)Selfdeployed Projects of Ganjiang Innovation Academy,Chinese Academy of Sciences(E055A01)the Key Research Program of the Chinese Academy of Sciences(ZDRW-CN-2021-3-3)。
文摘The rare earth elements(REEs)extraction by chemical leaching from ion-adsorption type rare earth ores(IAREO)has led to serious ecological and environmental risks.Conversely,demand for bioleaching is on the rise with the advantage of being environmental-friendly.As one of the organic acids produced by biological metabolism,citric acid was used to leach REEs and explore the performance and process.The results demonstrate that citric acid exhibits higher leaching efficiency(96.00%)for REEs at a relatively low concentration of 0.01 mol/L compared with(NH_(4))_(2)SO_(4)(84.29%,0.1 mol/L)and MgSO_(4)(83.99%,0.1 mol/L).Citric acid shows a preference for leaching heavy rare earth elements,with 99%leaching efficiency in IAREO,which shows higher capacity than(NH_(4))_(2)SO_(4)and MgSO_(4)(as inorganic leaching agents).Kinetic analysis indicates that the leaching process of REEs with citric acid is controlled by both the internal diffusion kinetics and chemical reaction kinetics,which is different from inorganic leaching agents.Visual Minteq calculations confirm that RE-Citrate is the main constituent of the extract solution in the leaching process of the IAREO,thereby enhancing the leaching efficiency of REEs from the IAREO.It suggests that citric acid may be used as a promising organic leaching agent for the environmentalfriendly extraction of REEs from IAREO.
文摘Dr.Chen Jiayong(Chia-Yung)was born on Feb.17,1922 in a prestigous intellectual clan at Jintang County,Sichuan Province,China.After receiving early education at the Chengdu County Middle School(now Chengdu 7th School),he was admitted as an undergraduate student to the Department of Chemical Engineering,the National Central University at the city of Chongqing from 1939 through 1943 during the Anti-Japanese War.After graduation,he continued to work as a teaching assistant for both the inorganic and organic chemistry courses.
基金National Key Research and Development Program,Grant/Award Number:2021YFC2102300National Natural Science Foundation of China,Grant/Award Numbers:22375144,32071384。
文摘In order to co-immobilize multiple enzymes,a wide range of nanomaterials has been designed to achieve synergistic enzyme activity and enhance catalytic efficiency.Nanomaterials,as carriers for enzyme co-immobilization,possess various advantages such as tunable morphology and size,high specific surface area,and abundant chemically active sites.They can significantly enhance enzyme stability,activity,and catalytic efficiency.We overview the commonly used methods and strategies of enzyme co-immobilization.This review further summarizes the latest research advances in nanomaterials for enzyme coimmobilization applications over the past 5 years.Meanwhile,the advantages and challenges of these nanomaterials used for enzyme co-immobilization as well as some potential future directions are also discussed.
