Low density and high porosity polyacrylonitrile(PAN)nanofibers prepared by electrospinning were used as brackets for photocatalyst W_(18)O_(49) to prepare a kind of light weight and easy recycling water purification m...Low density and high porosity polyacrylonitrile(PAN)nanofibers prepared by electrospinning were used as brackets for photocatalyst W_(18)O_(49) to prepare a kind of light weight and easy recycling water purification material for the first time.The influence of tungsten source concentration on the formation of W_(18)O_(49) during a solvothermal process was systematically investigated.The prepared PAN@W_(18)O_(49) nanofibers(NFs)utilize the outstanding visible light photocatalytic performance and the adsorption performance of W_(18)O_(49),and at the same time give the advantages of low density and easy recyclability.The pollutant removal performance of the composite nanofibers was investigated by using five contaminants including rhodamine B(RhB),methylene blue(MB),malachite green(MG),methyl orange(MO)and chlortetracycline(CTC)as substrates.Among them,the degradation process of rhodamine B has been studied in detail.After five cycles,the degradation efficiency did not decrease significantly,showing excellent reusability of PAN@W_(18)O_(49) NFs.Besides,the adsorption performance of PAN@W_(18)O_(49) NFs during the photocatalytic process was also studied in detail.Compared with recently reported literature,the degradation efficiency of organic pollutants by PAN@W_(18)O_(49) NFs showed better performance,and PAN@W_(18)O_(49) NFs felt had a promising prospect in the field of degradation of contaminants.展开更多
Lead ion(Pb^(2+))is one of the most hazardous heavy metal ions in aquatic environments.Carbon materials and manganese dioxide(MnO_(2))have been shown to be prospective adsorbents to cope with the lead pollution.In thi...Lead ion(Pb^(2+))is one of the most hazardous heavy metal ions in aquatic environments.Carbon materials and manganese dioxide(MnO_(2))have been shown to be prospective adsorbents to cope with the lead pollution.In this study,a novel hollow carbon@MnO_(2) composite nanofiber adsorbent was prepared by the combination of electrospinning and carbonization.The PAN nanofiber membrane is subjected to a pre-oxidation and carbonization process,and then the obtained carbon nanofibers react with KMnO4 solution during the hydrothermal process to develop the hollow carbon@MnO_(2) nanofibers.The hollow carbon@MnO_(2) nanofibers displayed a higher adsorption capacity of Pb^(2+)than carbon and MnO_(2)/PDA/PAN nanofibers.The maximum adsorption capacity toward Pb^(2+)by hollow carbon@MnO_(2) nanofibers was 460.83 mg/g.After 5 adsorption-desorption cycles,the carbon@MnO_(2) nanofibers had a good recyclability and the removal efficiency remained 81.47%.Moreover,the removal efficiency of the hollow composite nanofibers for Pb^(2+)from real wastewater could reach 94.37%.This work shows a strategy for synthetics of the hollow carbon@MnO_(2) nanofibers,which exhibits a promising potential in actual wastewater treatment.展开更多
基金This work was supported by the National Natural Science Foundation of China(No.21875084)the Fund of the Development and Reform Commission of Jilin Province,China(No.2020C023-5).
文摘Low density and high porosity polyacrylonitrile(PAN)nanofibers prepared by electrospinning were used as brackets for photocatalyst W_(18)O_(49) to prepare a kind of light weight and easy recycling water purification material for the first time.The influence of tungsten source concentration on the formation of W_(18)O_(49) during a solvothermal process was systematically investigated.The prepared PAN@W_(18)O_(49) nanofibers(NFs)utilize the outstanding visible light photocatalytic performance and the adsorption performance of W_(18)O_(49),and at the same time give the advantages of low density and easy recyclability.The pollutant removal performance of the composite nanofibers was investigated by using five contaminants including rhodamine B(RhB),methylene blue(MB),malachite green(MG),methyl orange(MO)and chlortetracycline(CTC)as substrates.Among them,the degradation process of rhodamine B has been studied in detail.After five cycles,the degradation efficiency did not decrease significantly,showing excellent reusability of PAN@W_(18)O_(49) NFs.Besides,the adsorption performance of PAN@W_(18)O_(49) NFs during the photocatalytic process was also studied in detail.Compared with recently reported literature,the degradation efficiency of organic pollutants by PAN@W_(18)O_(49) NFs showed better performance,and PAN@W_(18)O_(49) NFs felt had a promising prospect in the field of degradation of contaminants.
基金This work was supported by the National Natural Science Foundation of China(No.51773082).
文摘Lead ion(Pb^(2+))is one of the most hazardous heavy metal ions in aquatic environments.Carbon materials and manganese dioxide(MnO_(2))have been shown to be prospective adsorbents to cope with the lead pollution.In this study,a novel hollow carbon@MnO_(2) composite nanofiber adsorbent was prepared by the combination of electrospinning and carbonization.The PAN nanofiber membrane is subjected to a pre-oxidation and carbonization process,and then the obtained carbon nanofibers react with KMnO4 solution during the hydrothermal process to develop the hollow carbon@MnO_(2) nanofibers.The hollow carbon@MnO_(2) nanofibers displayed a higher adsorption capacity of Pb^(2+)than carbon and MnO_(2)/PDA/PAN nanofibers.The maximum adsorption capacity toward Pb^(2+)by hollow carbon@MnO_(2) nanofibers was 460.83 mg/g.After 5 adsorption-desorption cycles,the carbon@MnO_(2) nanofibers had a good recyclability and the removal efficiency remained 81.47%.Moreover,the removal efficiency of the hollow composite nanofibers for Pb^(2+)from real wastewater could reach 94.37%.This work shows a strategy for synthetics of the hollow carbon@MnO_(2) nanofibers,which exhibits a promising potential in actual wastewater treatment.
