At the beginning of rare earth industry,several days are normally required for characterization of rare earth elements(REEs)fractionation in ore samples.Herein,rapid fractionation analysis of 15 REEs and accompanied m...At the beginning of rare earth industry,several days are normally required for characterization of rare earth elements(REEs)fractionation in ore samples.Herein,rapid fractionation analysis of 15 REEs and accompanied metal(Fe,Mn,etc.)in ore samples has been achieved within 1 h using ICP-MS with a homemade device for online sequential solvent extraction.As a result,five fractionations for REEs occurrences,i.e.,water soluble,exchangeable,reducible,oxidizable and crystalline,have been identified,offering chemical insights which not only reveal the formation mechanism of REEs ores but also show great implications for guiding the exploitation and separation of REEs.In comparison with conventional methods,the present approach significantly shortened the analysis time(1 h vs.~80 h)and reduced the sample consumption(1.0 mg vs.5.0 g)with high recovery(>95%),providing a useful platform for the rapid quantitative fractionation analysis of REEs in complexed samples such as ore and fossils.展开更多
Waste plastics recycling and oil/organics remediation are environmental issues of global concern.In this work,a protectant was introduced,for the first time,to make highly efficient catalysts for pyrolysis of waste pl...Waste plastics recycling and oil/organics remediation are environmental issues of global concern.In this work,a protectant was introduced,for the first time,to make highly efficient catalysts for pyrolysis of waste plastics into carbon nanotubes(CNTs)with high yield.By using waste polyethylene,Co(NO_(3))_(2) and oleylamine respectively as carbon source,catalyst precursor and protectant,a yield as high as 59.0%was achieved.The CNTs exhibited a high adsorption capacity for methylene blue(up to 107.1 mg/g).Furthermore,by combining the CNTs with graphene oxide,a graphene-CNT aerogel with a low density of8.2 mg/cm^(3)and high porosity of 96.0%was successfully prepared.It showed excellent hydrophobicity and mechanical stability,as well as high adsorption capacity of 289-410 g/g oil/organic solvent,which was much higher than most of these achieved by carbon-based three-dimensional materials reported previously,making the as-prepared aerogel a very promising adsorbent for oil/water separation.展开更多
基金supported by the National Natural Science Foundation of China(21727812,21705016,21864001)the Program for Changjiang Scholars and Innovative Research Team in University(PCSIRT)(IRT_17R20)Department of Science and Technology of Jiangxi Province(20192AEI91006)。
文摘At the beginning of rare earth industry,several days are normally required for characterization of rare earth elements(REEs)fractionation in ore samples.Herein,rapid fractionation analysis of 15 REEs and accompanied metal(Fe,Mn,etc.)in ore samples has been achieved within 1 h using ICP-MS with a homemade device for online sequential solvent extraction.As a result,five fractionations for REEs occurrences,i.e.,water soluble,exchangeable,reducible,oxidizable and crystalline,have been identified,offering chemical insights which not only reveal the formation mechanism of REEs ores but also show great implications for guiding the exploitation and separation of REEs.In comparison with conventional methods,the present approach significantly shortened the analysis time(1 h vs.~80 h)and reduced the sample consumption(1.0 mg vs.5.0 g)with high recovery(>95%),providing a useful platform for the rapid quantitative fractionation analysis of REEs in complexed samples such as ore and fossils.
基金supported by National Natural Science Foundation of China(Nos.51872210,51672194)Program for Innovative Teams of Outstanding Young and Middle-aged Researchers in the Higher Education Institutions of Hubei Province(No.T201602)Key Program of Natural Science Foundation of Hubei Province,China(No.2017CFA004)。
文摘Waste plastics recycling and oil/organics remediation are environmental issues of global concern.In this work,a protectant was introduced,for the first time,to make highly efficient catalysts for pyrolysis of waste plastics into carbon nanotubes(CNTs)with high yield.By using waste polyethylene,Co(NO_(3))_(2) and oleylamine respectively as carbon source,catalyst precursor and protectant,a yield as high as 59.0%was achieved.The CNTs exhibited a high adsorption capacity for methylene blue(up to 107.1 mg/g).Furthermore,by combining the CNTs with graphene oxide,a graphene-CNT aerogel with a low density of8.2 mg/cm^(3)and high porosity of 96.0%was successfully prepared.It showed excellent hydrophobicity and mechanical stability,as well as high adsorption capacity of 289-410 g/g oil/organic solvent,which was much higher than most of these achieved by carbon-based three-dimensional materials reported previously,making the as-prepared aerogel a very promising adsorbent for oil/water separation.
