Sulfhydryl magnetic biological bamboo charcoal nanocomposite(BBC@nFe-SH)was prepared by chemical co-precipitation method for the robust capture of As(Ⅲ)from aqueous solutions.The novel BBC@nFe-SH shows favorable magn...Sulfhydryl magnetic biological bamboo charcoal nanocomposite(BBC@nFe-SH)was prepared by chemical co-precipitation method for the robust capture of As(Ⅲ)from aqueous solutions.The novel BBC@nFe-SH shows favorable magnetic field strength(83376 A/m),which enables BBC@nFe-SH to be quickly recovered from aqueous solution.The maximum As(Ⅲ)adsorption capacity is as high as 98.63 mg/g at pH 5.0 and 40°C,reaching reaction equilibrium within 120 min.Various characterizations(e.g.,SEM,FTIR,VSM and XPS)suggest that As(Ⅲ)prefers to coordinate with surface oxygen groups bonded to the surface.BBC@nFe-SH displayed high stability and recyclability throughout the removal process,which could be easily activated by 1 mol/L NaOH after usage.Thus,the novel BBC@nFe-SH has promising applications for As(Ⅲ)treatment.展开更多
Two-dimensional(2D)materials,especially 2D transition metal oxides(TMOs),have garnered significant research attention due to their unique physical and chemical properties and vast potential applications in electronics...Two-dimensional(2D)materials,especially 2D transition metal oxides(TMOs),have garnered significant research attention due to their unique physical and chemical properties and vast potential applications in electronics,optoelectronics,magneto electronics,and energy storage.However,synthesizing 2D TMOs remains a major challenge due to their non-layered lattice structure and the high temperatures required for synthesis.In this study,we report the chemical vapor deposition-based synthesis of high-quality 2D Cr_(2)O_(3) single-crystal nanosheets and investigate their structure and electrical properties.By controlling the growth temperature and carrier gas,we successfully obtained Cr_(2)O_(3) nanosheets with lateral dimensions up to 30μm and a minimum thickness of 4.7 nm.Optical studies,X-ray diffraction,atomic force microscopy,and transmission electron microscopy confirm that the resulting nanosheets are high-quality single crystals.Electrical measurements reveal that charge transport in Cr_(2)O_(3) devices is influenced by both Schottky emission and Poole-Frenkel emission,leading to a non-equilibrium charge conduction state.This systematic synthesis approach provides a reliable route for fabricating 2D TMO single crystals with controlled thickness and offers a platform for investigating charge transfer at electrode-dielectric interfaces,as well as for the design of novel electronic materials and catalysts.展开更多
基金financial support from the Key Research and Development Program of Hunan Province,China (No.2021GK4059)。
文摘Sulfhydryl magnetic biological bamboo charcoal nanocomposite(BBC@nFe-SH)was prepared by chemical co-precipitation method for the robust capture of As(Ⅲ)from aqueous solutions.The novel BBC@nFe-SH shows favorable magnetic field strength(83376 A/m),which enables BBC@nFe-SH to be quickly recovered from aqueous solution.The maximum As(Ⅲ)adsorption capacity is as high as 98.63 mg/g at pH 5.0 and 40°C,reaching reaction equilibrium within 120 min.Various characterizations(e.g.,SEM,FTIR,VSM and XPS)suggest that As(Ⅲ)prefers to coordinate with surface oxygen groups bonded to the surface.BBC@nFe-SH displayed high stability and recyclability throughout the removal process,which could be easily activated by 1 mol/L NaOH after usage.Thus,the novel BBC@nFe-SH has promising applications for As(Ⅲ)treatment.
基金the support from the National Natural Science Foundation of China(Nos.51991340,62404079,and 62404078)the open research fund of Songshan Lake Materials Laboratory(No.2023SLABFN07)+3 种基金the Natural Science Foundation of Hunan Province(No.2024JJ6135)the Natural Science Foundation of Changsha City(No.kq2402064)the Hunan Key R&D Program Project(No.2022GK2005)the National Key R&D Program of the Ministry of Science and Technology of China(No.2022YFA1203801).
文摘Two-dimensional(2D)materials,especially 2D transition metal oxides(TMOs),have garnered significant research attention due to their unique physical and chemical properties and vast potential applications in electronics,optoelectronics,magneto electronics,and energy storage.However,synthesizing 2D TMOs remains a major challenge due to their non-layered lattice structure and the high temperatures required for synthesis.In this study,we report the chemical vapor deposition-based synthesis of high-quality 2D Cr_(2)O_(3) single-crystal nanosheets and investigate their structure and electrical properties.By controlling the growth temperature and carrier gas,we successfully obtained Cr_(2)O_(3) nanosheets with lateral dimensions up to 30μm and a minimum thickness of 4.7 nm.Optical studies,X-ray diffraction,atomic force microscopy,and transmission electron microscopy confirm that the resulting nanosheets are high-quality single crystals.Electrical measurements reveal that charge transport in Cr_(2)O_(3) devices is influenced by both Schottky emission and Poole-Frenkel emission,leading to a non-equilibrium charge conduction state.This systematic synthesis approach provides a reliable route for fabricating 2D TMO single crystals with controlled thickness and offers a platform for investigating charge transfer at electrode-dielectric interfaces,as well as for the design of novel electronic materials and catalysts.
