In most developing countries, particularly in the countries of sub-Saharan Africa, corn cobs are considered as waste polluting the environment during the harvest period of this cereal. In order to valorize this agricu...In most developing countries, particularly in the countries of sub-Saharan Africa, corn cobs are considered as waste polluting the environment during the harvest period of this cereal. In order to valorize this agricultural waste, high-performance, inexpensive and low-energy consumption magnetic bioadsorbents were prepared from corn cobs. The chemically activated raw corn cob was magnetized by coating the surface with magnetite nanoparticles. The prepared biosorbents were characterized by FT-IR, XRD, FE-SEM associated with EDX, HR-TEM, TG analysis, BET surface area analysis and XPS. The maximum specific surface area of 35.22 m<sup>2</sup>/g was reached. An attempt to use of these magnetic biosorbents for the removal of heavy metal like Cr(VI) from aqueous solution was envisaged.展开更多
In this study,we report the fabrication of nitrogen rich activated nanosized carbon with hierarchical micro/mesoporous and ultrahigh specific surface area by template-free and one-step carbonization-activation method,...In this study,we report the fabrication of nitrogen rich activated nanosized carbon with hierarchical micro/mesoporous and ultrahigh specific surface area by template-free and one-step carbonization-activation method,which greatly simplified the process and avoided the waste of reagents.Chitin nanoparticles were prepared by a mechanical induced sol-gel transition process in NaOH/Urea solvent and a subsequent carbonization utilizing NaOH for activation and urea for N doping,resulting in activated carbon(ACNC-800)with extraordinary specific surface area(2631 m^(2)/g)and high nitrogen content(7.1%).Further characterization and electrochemical tests demonstrate high electrochemical performance of the activated nanocarbon.Under the current density of 0.5 A/g,the specific capacitance of the three-electrode system is 245 F/g and that of the two-electrode system is 227 F/g.The assembled capacitors exhibit superior rate performance and good cycle stability(98%capacitance retention after 10000 charge-discharge cycles).This work introduces a simple and efficient strategy to prepare N-doped carbon with hierarchical porosity applied to high performance supercapacitors.展开更多
文摘In most developing countries, particularly in the countries of sub-Saharan Africa, corn cobs are considered as waste polluting the environment during the harvest period of this cereal. In order to valorize this agricultural waste, high-performance, inexpensive and low-energy consumption magnetic bioadsorbents were prepared from corn cobs. The chemically activated raw corn cob was magnetized by coating the surface with magnetite nanoparticles. The prepared biosorbents were characterized by FT-IR, XRD, FE-SEM associated with EDX, HR-TEM, TG analysis, BET surface area analysis and XPS. The maximum specific surface area of 35.22 m<sup>2</sup>/g was reached. An attempt to use of these magnetic biosorbents for the removal of heavy metal like Cr(VI) from aqueous solution was envisaged.
基金supported by the Key Research and Development Program of Hubei Province(No.2020BCA079)Natural Science Foundation of Hubei Province of China(Team Project,No.2015CFA017).
文摘In this study,we report the fabrication of nitrogen rich activated nanosized carbon with hierarchical micro/mesoporous and ultrahigh specific surface area by template-free and one-step carbonization-activation method,which greatly simplified the process and avoided the waste of reagents.Chitin nanoparticles were prepared by a mechanical induced sol-gel transition process in NaOH/Urea solvent and a subsequent carbonization utilizing NaOH for activation and urea for N doping,resulting in activated carbon(ACNC-800)with extraordinary specific surface area(2631 m^(2)/g)and high nitrogen content(7.1%).Further characterization and electrochemical tests demonstrate high electrochemical performance of the activated nanocarbon.Under the current density of 0.5 A/g,the specific capacitance of the three-electrode system is 245 F/g and that of the two-electrode system is 227 F/g.The assembled capacitors exhibit superior rate performance and good cycle stability(98%capacitance retention after 10000 charge-discharge cycles).This work introduces a simple and efficient strategy to prepare N-doped carbon with hierarchical porosity applied to high performance supercapacitors.
