In this work,we report the fabrication of novel VO_(2)(D)hollow core-shell microspheres(VO_(2)(D)-HCSMs)via a facile hydrothermal method.Microscopic examination revealed that the VO_(2)(D)-HCSMs consisted of numerous ...In this work,we report the fabrication of novel VO_(2)(D)hollow core-shell microspheres(VO_(2)(D)-HCSMs)via a facile hydrothermal method.Microscopic examination revealed that the VO_(2)(D)-HCSMs consisted of numerous nanocrystals and had an average size of 1-10μm and a shell thickness of 300 nm.An insideout Ostwald ripening process was responsible for the formation of the VO_(2)(D)-HCSMs.Meanwhile,citric acid played dual roles,acting as a reductant for reducing vanadium pentoxide and as a morphology directing agent for producing core-shell microspheres.The resulting VO_(2)(D)-HCSMs exhibited excellent adsorption performance with a maximum adsorption capacity of 97.5 mg g^(−1)for methylene blue(MB).The C/VO_(x)particles were generated by the calcination of the VO_(2)(D)-HCSMs with adsorbed MB dye at 250℃in air for 4 h,and the microspheres showed enhanced adsorption capacity and good reusability(over 99%MB removal after four cycles)because of the existence of amorphous carbon nanowires,making them a potential adsorbent for removing organic dyes from wastewater.展开更多
基金supported by the funding from the Ministry of Science and Technology of China(2016YFB0303901-05)the National Natural Science Foundation of China(51702208,51773061)+1 种基金funding from the State Outstanding Young Scholars(51325203)the Changjiang Scholars programmes(T2015136).
文摘In this work,we report the fabrication of novel VO_(2)(D)hollow core-shell microspheres(VO_(2)(D)-HCSMs)via a facile hydrothermal method.Microscopic examination revealed that the VO_(2)(D)-HCSMs consisted of numerous nanocrystals and had an average size of 1-10μm and a shell thickness of 300 nm.An insideout Ostwald ripening process was responsible for the formation of the VO_(2)(D)-HCSMs.Meanwhile,citric acid played dual roles,acting as a reductant for reducing vanadium pentoxide and as a morphology directing agent for producing core-shell microspheres.The resulting VO_(2)(D)-HCSMs exhibited excellent adsorption performance with a maximum adsorption capacity of 97.5 mg g^(−1)for methylene blue(MB).The C/VO_(x)particles were generated by the calcination of the VO_(2)(D)-HCSMs with adsorbed MB dye at 250℃in air for 4 h,and the microspheres showed enhanced adsorption capacity and good reusability(over 99%MB removal after four cycles)because of the existence of amorphous carbon nanowires,making them a potential adsorbent for removing organic dyes from wastewater.
