Sulfamethoxazole(SMX)is an antibiotic and widely present in aquatic environments,so it presents a serious threat to human health and sustainable development.A dielectric barrier discharge(DBD)plasma jet was utilized t...Sulfamethoxazole(SMX)is an antibiotic and widely present in aquatic environments,so it presents a serious threat to human health and sustainable development.A dielectric barrier discharge(DBD)plasma jet was utilized to degrade aqueous SMX,and the effects of various operating parameters(working gas,discharge power,etc)on SMX degradation performance were studied.The experimental results showed that the DBD plasma jet can obtain a relatively high degradation efficiency for SMX when the discharge power is high with an oxygen atmosphere,the initial concentration of SMX is low,and the aqueous solution is under acidic conditions.The reactive species produced in the liquid phase were detected,and OH radicals and O3were found to play a significant role in the degradation of SMX.Moreover,the process of SMX degradation could be better fitted by the quasi-first-order reaction kinetic equation.The analysis of the SMX degradation process indicated that SMX was gradually decomposed and 4-amino benzene sulfonic acid,benzene sulfonamide,4-nitro SMX,and phenylsulfinyl acid were detected,and thus three possible degradation pathways were finally proposed.The mineralization degree of SMX reached 90.04%after plasma treatment for 20 min,and the toxicity of the solution fluctuated with the discharge time but eventually decreased.展开更多
Surface modification on a polytetrafluoroethylene (PTFE)panel was performedwith sequential nitrogen plasma treatments and surface-initiated polymerization.By introducingCOO— groups to the surface of the PTFE panel th...Surface modification on a polytetrafluoroethylene (PTFE)panel was performedwith sequential nitrogen plasma treatments and surface-initiated polymerization.By introducingCOO— groups to the surface of the PTFE panel through grafting polymerization of acrylic acid(AA),a transparent poly (acrylic acid)(PAA)membrane was achieved from acrylic acid solution.Grafting polymerization initiating from the active groups was achieved on the PTFE panel surfaceafter the nitrogen plasma treatment.Utilizing the acrylic acid as monomers,with COO— groupsas cross link sites to form reticulation structure,a transparent poly (acrylic acid)membrane witharborescent macromolecular structure was formed on the PTFE panel surface.Analysis methods,such as fourier transform infrared spectroscopy (FTIR),microscopy and X-ray photoelectronspectroscopy (XPS),were utilized to characterize the structures of the macromolecule membraneon the PTFE panel surface.A contact angle measurement was performed to characterize themodified PTFE panels.The surface hydrophilicities of modified PTFE panels were significantlyenhanced after the plasma treatment.It was shown that the grafting rate is related to the treatingtime and the power of plasma.展开更多
Low-temperature plasma treatment was adopted to graft styrene onto polytetrafluoroethylene(PTFE) powder,which is widely used in the fabrication of proton exchange membrane(PEM).The grafted PTFE powder was sulfonated i...Low-temperature plasma treatment was adopted to graft styrene onto polytetrafluoroethylene(PTFE) powder,which is widely used in the fabrication of proton exchange membrane(PEM).The grafted PTFE powder was sulfonated in chlorosulfonic acid and fabricated into amembrane,which was used as inexpensive PEM material for a proton exchange membrane fuelcell (PEMFC).Fourier transform infrared spectroscopy attenuated total reflection spectroscopy(FTIR-ATR) and X-ray photoelectron spectroscopy (XPS) analysis were used to characterize thestructure of the sulfonated PTFE powder.The results showed that all the PTFE powders weresuccessfully grafted by nitrogen plasma and then sulfonated under such experimental conditions.A scanning electron microscopy (SEM) image indicated that the fabricated membrane exhibitsflat morphology and homogenous structure.The ion exchange capacity (IEC) of this kind of PEMwas also investigated.展开更多
An atmospheric-pressure air plasma is employed to treat C6 glioma cells in vitro.To elucidate on the mechanism causing cell death and role of reactive species(RS) in the medium produced by the plasma,the concentration...An atmospheric-pressure air plasma is employed to treat C6 glioma cells in vitro.To elucidate on the mechanism causing cell death and role of reactive species(RS) in the medium produced by the plasma,the concentration of the long-lived RS such as hydrogen peroxide,nitrate,and ozone in the plasma-treated liquid(phosphate-buffered saline solution) is measured.When vitamin C is added to the medium as a ROS quencher,the viability of C6 glioma cells after the plasma treatment is different from that without vitamin C.The results demonstrate that reactive oxygen species(ROS) such as H_2O_2,and O_3 constitute the main factors for inactivation of C6 glioma cells and the reactive nitrogen species(RNS) may only play an auxiliary role in cell death.展开更多
基金supported jointly by National Natural Science Foundation of China(Nos.U20A20372,51807046,51777206)the Natural Science Foundation of Anhui Province(Nos.2108085MD136,1908085MA29)。
文摘Sulfamethoxazole(SMX)is an antibiotic and widely present in aquatic environments,so it presents a serious threat to human health and sustainable development.A dielectric barrier discharge(DBD)plasma jet was utilized to degrade aqueous SMX,and the effects of various operating parameters(working gas,discharge power,etc)on SMX degradation performance were studied.The experimental results showed that the DBD plasma jet can obtain a relatively high degradation efficiency for SMX when the discharge power is high with an oxygen atmosphere,the initial concentration of SMX is low,and the aqueous solution is under acidic conditions.The reactive species produced in the liquid phase were detected,and OH radicals and O3were found to play a significant role in the degradation of SMX.Moreover,the process of SMX degradation could be better fitted by the quasi-first-order reaction kinetic equation.The analysis of the SMX degradation process indicated that SMX was gradually decomposed and 4-amino benzene sulfonic acid,benzene sulfonamide,4-nitro SMX,and phenylsulfinyl acid were detected,and thus three possible degradation pathways were finally proposed.The mineralization degree of SMX reached 90.04%after plasma treatment for 20 min,and the toxicity of the solution fluctuated with the discharge time but eventually decreased.
基金supported by National Natural Science Foundation of China (No. 10975162)Knowledge Innovation Project of Young Talent, Hefei Institutes of Physical Science, CAS (Nos. 075FCQ0126, Y05FCQ0127)
文摘Surface modification on a polytetrafluoroethylene (PTFE)panel was performedwith sequential nitrogen plasma treatments and surface-initiated polymerization.By introducingCOO— groups to the surface of the PTFE panel through grafting polymerization of acrylic acid(AA),a transparent poly (acrylic acid)(PAA)membrane was achieved from acrylic acid solution.Grafting polymerization initiating from the active groups was achieved on the PTFE panel surfaceafter the nitrogen plasma treatment.Utilizing the acrylic acid as monomers,with COO— groupsas cross link sites to form reticulation structure,a transparent poly (acrylic acid)membrane witharborescent macromolecular structure was formed on the PTFE panel surface.Analysis methods,such as fourier transform infrared spectroscopy (FTIR),microscopy and X-ray photoelectronspectroscopy (XPS),were utilized to characterize the structures of the macromolecule membraneon the PTFE panel surface.A contact angle measurement was performed to characterize themodified PTFE panels.The surface hydrophilicities of modified PTFE panels were significantlyenhanced after the plasma treatment.It was shown that the grafting rate is related to the treatingtime and the power of plasma.
文摘Low-temperature plasma treatment was adopted to graft styrene onto polytetrafluoroethylene(PTFE) powder,which is widely used in the fabrication of proton exchange membrane(PEM).The grafted PTFE powder was sulfonated in chlorosulfonic acid and fabricated into amembrane,which was used as inexpensive PEM material for a proton exchange membrane fuelcell (PEMFC).Fourier transform infrared spectroscopy attenuated total reflection spectroscopy(FTIR-ATR) and X-ray photoelectron spectroscopy (XPS) analysis were used to characterize thestructure of the sulfonated PTFE powder.The results showed that all the PTFE powders weresuccessfully grafted by nitrogen plasma and then sulfonated under such experimental conditions.A scanning electron microscopy (SEM) image indicated that the fabricated membrane exhibitsflat morphology and homogenous structure.The ion exchange capacity (IEC) of this kind of PEMwas also investigated.
基金jointly supported by the Education and Research Foundation of Anhui Province(KJ2015A327)Science Foundation of Institute of Plasma Physics,Chinese Academy of Sciences No.DSJJ-14-YY02Hong Kong Research Grants Council(RGC)General Research Funds(GRF)No.CityU 11301215
文摘An atmospheric-pressure air plasma is employed to treat C6 glioma cells in vitro.To elucidate on the mechanism causing cell death and role of reactive species(RS) in the medium produced by the plasma,the concentration of the long-lived RS such as hydrogen peroxide,nitrate,and ozone in the plasma-treated liquid(phosphate-buffered saline solution) is measured.When vitamin C is added to the medium as a ROS quencher,the viability of C6 glioma cells after the plasma treatment is different from that without vitamin C.The results demonstrate that reactive oxygen species(ROS) such as H_2O_2,and O_3 constitute the main factors for inactivation of C6 glioma cells and the reactive nitrogen species(RNS) may only play an auxiliary role in cell death.
