TiO2 nanotubes （TiNT） were prepared by a hydrothermal treatment and modified by three kinds of amines,namely ethylenediamine,polyetherimide and tetraethylenepentamine （TEPA）,to study their CO2 adsorption propertie...TiO2 nanotubes （TiNT） were prepared by a hydrothermal treatment and modified by three kinds of amines,namely ethylenediamine,polyetherimide and tetraethylenepentamine （TEPA）,to study their CO2 adsorption properties from gas streams.The resultant samples were characterized by X-ray diffraction,transmission electron microscopy,and infrared spectroscopy,as well as low temperature N 2 adsorption.CO2 capture was investigated in a dynamic packed column at 30℃.TEPA-modified TiO2 nanotubes showed the highest adsorption capacity of 167.64 mg/g because it had the highest amino-group content among the three amines.CO2 fixation on TiNT impregnated by TEPA was investigated at 30,50,and 70℃,and the adsorption capacity increased slightly with temperature.Following the adsorption step,the sorbents were regenerated by temperature programmed desorption,and the TiNT-TEPA sample,as CO2 sorbent,was found to be readily regenerated and energy-efficient.The cycle test also revealed that the TiNT-TEPA adsorbent is fairly stable,with only a 5% drop in the adsorption capacity after 10 adsorption/desorption cycles.In addition,the CO2 adsorption behavior was investigated with the deactivation model,and which showed an excellent prediction for the TiNT-TEPA breakthrough curves.展开更多
Nanofibers with high specific surface area and chemical stability have broad prospects in the applications of adsorption.However,the adsorption capacity is limited by the scarcity of adsorption groups and storage spac...Nanofibers with high specific surface area and chemical stability have broad prospects in the applications of adsorption.However,the adsorption capacity is limited by the scarcity of adsorption groups and storage space.Herein,the activated carbon-hybridized and amine-modified nanofibers are prepared by integrating activated carbon(AC)and polyacrylonitrile(PAN)via electrospinning method and the subsequent amination,which could provide additional storage space and adsorption groups for ultrahigh adsorption capability.Thus,the obtained amine-rich porous PAN nanofibers(APAN/AC)readily realized the ultrahigh adsorption capacity for metal ions and dyes in wastewater.Specifically,the adsorption capacity of APAN/AC nanofibers were 284 mg·g^(-1) for Cr(VI)and 248 mg·g^(-1) for methyl orange,which were almost 2 and 4 times than that of amine-modified nanofibers(APAN)and carbon-hybridized nanofibers(PAN/AC),respectively.Moreover,the AC inhibited the chain mobility of polymer matrix and thereby endowing APAN/AC nanofibers with excellent recyclability.The adsorption capability retained 80%after nine adsorption-desorption cycles.The adsorption kinetics and corresponding mechanism were further explored.This strategy combines the advantages of polymer nanofibers and AC,opening a new avenue for developing next-generation absorbent materials.展开更多
A methanol-soluble diamine-modified fullerene derivative(denoted as PCBDANI)was applied as an efficient cathode buffer layer(CBL)in planar p-i-n perovskite solar cells(pero-SCs)based on the CH_3NH_3PbI_(3-x)Cl_x absor...A methanol-soluble diamine-modified fullerene derivative(denoted as PCBDANI)was applied as an efficient cathode buffer layer(CBL)in planar p-i-n perovskite solar cells(pero-SCs)based on the CH_3NH_3PbI_(3-x)Cl_x absorber.The device with PCBDANI single CBL exhibited significantly improved performance with a power conversion efficiency(PCE)of 15.45%,which is approximately17%higher than that of the control device without the CBL.The dramatic improvement in PCE can be attributed to the formation of an interfacial dipole at the PCBM/Al interface originating from the amine functional group and the suppression of interfacial recombinationby the PCBDANI interlayer.To further improve the PCE of pero-SCs,PCBDANI/LiF double CBLs were introduced between PCBM and the top Al electrode.An impressive PCE of 15.71%was achieved,which is somewhat higher than that of the devices with LiF or PCBDANI single CBL.Besides the PCE,the long-term stability of the device with PCBDANI/LiF double CBLs is also superior to that of the device with LiF single CBL.展开更多
基金supported by the Industry-Academia Cooperation Innovation Fund Projects of Jiangsu Province(No.BY2012025)
文摘TiO2 nanotubes （TiNT） were prepared by a hydrothermal treatment and modified by three kinds of amines,namely ethylenediamine,polyetherimide and tetraethylenepentamine （TEPA）,to study their CO2 adsorption properties from gas streams.The resultant samples were characterized by X-ray diffraction,transmission electron microscopy,and infrared spectroscopy,as well as low temperature N 2 adsorption.CO2 capture was investigated in a dynamic packed column at 30℃.TEPA-modified TiO2 nanotubes showed the highest adsorption capacity of 167.64 mg/g because it had the highest amino-group content among the three amines.CO2 fixation on TiNT impregnated by TEPA was investigated at 30,50,and 70℃,and the adsorption capacity increased slightly with temperature.Following the adsorption step,the sorbents were regenerated by temperature programmed desorption,and the TiNT-TEPA sample,as CO2 sorbent,was found to be readily regenerated and energy-efficient.The cycle test also revealed that the TiNT-TEPA adsorbent is fairly stable,with only a 5% drop in the adsorption capacity after 10 adsorption/desorption cycles.In addition,the CO2 adsorption behavior was investigated with the deactivation model,and which showed an excellent prediction for the TiNT-TEPA breakthrough curves.
基金This work is supported by Natural Science Foundation of Henan Province(Grant No.182300410276)the National Natural Science Foundation of China(Grant No.51904274)Program for Innovative Research Team(in Science and Technology)in University of Henan Province(Grant No.19IRTSTHN028).
文摘Nanofibers with high specific surface area and chemical stability have broad prospects in the applications of adsorption.However,the adsorption capacity is limited by the scarcity of adsorption groups and storage space.Herein,the activated carbon-hybridized and amine-modified nanofibers are prepared by integrating activated carbon(AC)and polyacrylonitrile(PAN)via electrospinning method and the subsequent amination,which could provide additional storage space and adsorption groups for ultrahigh adsorption capability.Thus,the obtained amine-rich porous PAN nanofibers(APAN/AC)readily realized the ultrahigh adsorption capacity for metal ions and dyes in wastewater.Specifically,the adsorption capacity of APAN/AC nanofibers were 284 mg·g^(-1) for Cr(VI)and 248 mg·g^(-1) for methyl orange,which were almost 2 and 4 times than that of amine-modified nanofibers(APAN)and carbon-hybridized nanofibers(PAN/AC),respectively.Moreover,the AC inhibited the chain mobility of polymer matrix and thereby endowing APAN/AC nanofibers with excellent recyclability.The adsorption capability retained 80%after nine adsorption-desorption cycles.The adsorption kinetics and corresponding mechanism were further explored.This strategy combines the advantages of polymer nanofibers and AC,opening a new avenue for developing next-generation absorbent materials.
基金the National Natural Science Foundation of China(21204054,51303118,91333204)the Natural Science Foundation of Jiangsu Province(BK20130289)+3 种基金the Ph.D.Programs Foundation of Ministry of Education of China(20133201120008)the Priority Academic Program Development of Jiangsu Higher Education Institutionsthe Scientific Research Foundation for Returned Scholars,Ministry of Education of ChinaBeijing National Laboratory for Molecular Sciences,State and Local Joint Engineering Laboratory for Novel Functional Polymeric Materials
文摘A methanol-soluble diamine-modified fullerene derivative(denoted as PCBDANI)was applied as an efficient cathode buffer layer(CBL)in planar p-i-n perovskite solar cells(pero-SCs)based on the CH_3NH_3PbI_(3-x)Cl_x absorber.The device with PCBDANI single CBL exhibited significantly improved performance with a power conversion efficiency(PCE)of 15.45%,which is approximately17%higher than that of the control device without the CBL.The dramatic improvement in PCE can be attributed to the formation of an interfacial dipole at the PCBM/Al interface originating from the amine functional group and the suppression of interfacial recombinationby the PCBDANI interlayer.To further improve the PCE of pero-SCs,PCBDANI/LiF double CBLs were introduced between PCBM and the top Al electrode.An impressive PCE of 15.71%was achieved,which is somewhat higher than that of the devices with LiF or PCBDANI single CBL.Besides the PCE,the long-term stability of the device with PCBDANI/LiF double CBLs is also superior to that of the device with LiF single CBL.
