A hierarchical reduced graphene oxide-MnO_(2)@polypyrrole coaxial nanotube composite hydrogel was prepared via oxidative polymerization of pyrrole in the presence of MnO_(2)nanotubes,followed by the hydrothermal treat...A hierarchical reduced graphene oxide-MnO_(2)@polypyrrole coaxial nanotube composite hydrogel was prepared via oxidative polymerization of pyrrole in the presence of MnO_(2)nanotubes,followed by the hydrothermal treatment of graphene oxide and MnO_(2)@polypyrrole coaxial nanotubes.The stable composite hydrogel with a hierarchical network was composed of one-dimensional MnO_(2)@polypyrrole coaxial nanotube and two-dimensional graphene nanosheet and characterized by scanning electron microscope,Fourier transform infrared spectroscopy,X-ray diffraction,Brunauer-Emmett-Teller surface,and X-ray photoelectron spectroscopy measurements.The composite hydrogel can be used as an efficient adsorbent for Cr(Ⅵ)removal due to the synergistic interaction between graphene and MnO_(2)@polypyrrole and the hierarchical structure of the hydrogel.Moreover,the composite hydrogel is easily separated because of its stable monolith,and it is reusable(76.8%of removal ability remaining after five adsorption-desorption cycles).The simple fabrication and cost-effective separation process together with the excellent absorption performance endow the composite hydrogel with great potential for practical wastewater treatment.展开更多
Carboxymethyl cellulose(CMC)with different degree of substitution(DS)was prepared by controlling feed ratio and times of alkalization and etherification.CMC with different molecular weight was prepared by degradation ...Carboxymethyl cellulose(CMC)with different degree of substitution(DS)was prepared by controlling feed ratio and times of alkalization and etherification.CMC with different molecular weight was prepared by degradation of hydrochloric acid solution.Orthogonal experiments were designed to study the effects of addition amount,molecular weight and DS of CMC on the tensile strength of tobacco sheets.The effects of CMC on the thermal properties and aerosol release of tobacco sheets were also studied.The results showed that the addition amount and the molecular weight of CMC had obvious effect on the tensile strength of tobacco sheets.The DS of CMC had no significant effect on the tensile strength of tobacco sheets.The addition of CMC improved the thermal stability of tobacco sheets to a certain extent,and had certain influence on the content of nicotine in aerosol.展开更多
基金Funded by the Open/Innovation Fund of Hubei Three Gorges Laboratory(No.SK212002)。
文摘A hierarchical reduced graphene oxide-MnO_(2)@polypyrrole coaxial nanotube composite hydrogel was prepared via oxidative polymerization of pyrrole in the presence of MnO_(2)nanotubes,followed by the hydrothermal treatment of graphene oxide and MnO_(2)@polypyrrole coaxial nanotubes.The stable composite hydrogel with a hierarchical network was composed of one-dimensional MnO_(2)@polypyrrole coaxial nanotube and two-dimensional graphene nanosheet and characterized by scanning electron microscope,Fourier transform infrared spectroscopy,X-ray diffraction,Brunauer-Emmett-Teller surface,and X-ray photoelectron spectroscopy measurements.The composite hydrogel can be used as an efficient adsorbent for Cr(Ⅵ)removal due to the synergistic interaction between graphene and MnO_(2)@polypyrrole and the hierarchical structure of the hydrogel.Moreover,the composite hydrogel is easily separated because of its stable monolith,and it is reusable(76.8%of removal ability remaining after five adsorption-desorption cycles).The simple fabrication and cost-effective separation process together with the excellent absorption performance endow the composite hydrogel with great potential for practical wastewater treatment.
基金Supported by the China Tobacco Corporation Major Special Project。
文摘Carboxymethyl cellulose(CMC)with different degree of substitution(DS)was prepared by controlling feed ratio and times of alkalization and etherification.CMC with different molecular weight was prepared by degradation of hydrochloric acid solution.Orthogonal experiments were designed to study the effects of addition amount,molecular weight and DS of CMC on the tensile strength of tobacco sheets.The effects of CMC on the thermal properties and aerosol release of tobacco sheets were also studied.The results showed that the addition amount and the molecular weight of CMC had obvious effect on the tensile strength of tobacco sheets.The DS of CMC had no significant effect on the tensile strength of tobacco sheets.The addition of CMC improved the thermal stability of tobacco sheets to a certain extent,and had certain influence on the content of nicotine in aerosol.
