Anion mass spectrometry is developed on the basis of our home-made anion velocity map imaging apparatus. The Cl^-; product efficiency curve for dissociative electron attachment to 1,2-dichlorobenzene is obtained from ...Anion mass spectrometry is developed on the basis of our home-made anion velocity map imaging apparatus. The Cl^-; product efficiency curve for dissociative electron attachment to 1,2-dichlorobenzene is obtained from 0.2 to 8 eV, meanwhile the sliced images of this anion are recorded at 1.2 and 6.0 eV corresponding to two peak positions of the product efficiency curve.展开更多
The Mn-Ce-Fe mixed oxide(MCFe)was prepared by co-precipitation and the catalytic performance was tested by using 1,2-dichlorobenzene(1,2-DCB)and furan as model molecules of PCDD/F.The effect of O_(2)concentration,SO_(...The Mn-Ce-Fe mixed oxide(MCFe)was prepared by co-precipitation and the catalytic performance was tested by using 1,2-dichlorobenzene(1,2-DCB)and furan as model molecules of PCDD/F.The effect of O_(2)concentration,SO_(2) and NO on the catalytic activity was studied.At 270℃,the MCFe oxide catalyst presents significant simultaneous removal efficiency of 75.25%and 100%for 1,2-DCB and furan,respectively.Brunauer-Emmett-Teller(BET)method(BET),X-ray diffraction(XRD),scanning electron microscopy(SEM),X-ray photoelectron spectroscopy(XPS),Fourier transform infrared spectroscopy(FTIR),H_2-temperature programmed reduction(H_(2)-TPR),NH_(3)-temperature programmed desorption(NH_3-TPD)and O_(2)-TPD were used to characterize the catalysts before and after the reaction.Competition tests suggest that the oxidation behavior of furan occurred prior to that of 1,2-DCB.According to the intermediate products detected by gas chromatography-mass spectrometry(GC-MS),the by-products include chlorinated hydrocarbons,long-chain hydrocarbons,ketone,etc.Possible catalytic oxidation reaction paths are proposed.展开更多
In this study,Mn-based bimetallic oxide catalysts were synthesized via the solvothermal method.Different metals(Ce,Co and Fe)exhibited a great impact on the physicochemical properties of catalysts,resulting in differe...In this study,Mn-based bimetallic oxide catalysts were synthesized via the solvothermal method.Different metals(Ce,Co and Fe)exhibited a great impact on the physicochemical properties of catalysts,resulting in different catalytic activities for the simultaneous removal of 1,2-dichlorobenzene(1,2-DCB)and furan,as a model of polychlorinated dibenzodioxins and dibenzo-furans(PCDD/Fs).Fe–MnOx presented the best catalytic activity,with a removal efficiency of 62%for 1,2-DCB and 100%for furan at 240℃.Several analytical techniques were employed,namely,Brunauer–Emmett–Teller(BET),X-ray diffraction(XRD),scanning electron microscope(SEM),X-ray photoelectron spectroscopy(XPS),H_(2)temperature-programmed reduction(H_(2)-TPR),and ammonia temperature programmed desorption(NH_(3)-TPD).Compared with pure MnOx catalysts,Fe–MnOx shows a higher specific surface area of 117.9 m^(2)/g.SEM observations showed flower-like nanosheet structures for Fe–MnOx.XPS analysis indicated that Mn^(4+)/Mn^(3+)and active oxygen play the key roles in the catalytic oxidation of 1,2-DCB and furan.The catalytic activity,selectivity and stability of Mn-based bimetallic oxide catalysts for the oxidation of 1,2-DCB and furan were tested.Competition exists between 1,2-DCB and furan such that the adsorption of furan occurs prior to 1,2-DCB.展开更多
芝麻是八大类食物过敏原之一,快速准确识别芝麻过敏原对预防其过敏有重要意义。核酸适配体可以高效识别靶标过敏原,在过敏原检测中有良好的应用前景。为了获得芝麻主要过敏原Ses i 2的特异性核酸适体,本研究以Ses i 2为靶标,通过磁珠筛...芝麻是八大类食物过敏原之一,快速准确识别芝麻过敏原对预防其过敏有重要意义。核酸适配体可以高效识别靶标过敏原,在过敏原检测中有良好的应用前景。为了获得芝麻主要过敏原Ses i 2的特异性核酸适体,本研究以Ses i 2为靶标,通过磁珠筛选法(磁珠-SELEX)开展10轮筛选,经由高通量测序获得6条候补序列(S1~S6),并进行家族性、同源性分析及二级结构预测。结果表明,6条候选核酸适体的重复率可达46.38%,其自由能在-9.02到-2.47 kcal·moL^(-1)之间,根据自由能能量稳定原则,S1和S5吉布斯自由能最低最稳定,分别为-6.70和-9.02 kcal·moL^(-1)。利用ELISA试验进行亲和力测试,结果表明核酸适体S1和S2的亲和能力较强,S1:KD=67.02 nmol·L^(-1),R2=0.925 8,S2:KD=97.65 nmol·L^(-1),R2=0.795 1。核酸适体S1与过敏原Ses i 2的结合力和其他过敏原蛋白相比有显著差异,可视为具有特异性。本研究最终获得一条兼具良好亲和力和特异性的核酸适体S1,为芝麻过敏原快速检测提供了技术支撑。展开更多
基金This work was supported by the Ministry of Science and Technology of China （No.2011CB921401） and the National Natural Science Foundation of China （No.21273213）.
文摘Anion mass spectrometry is developed on the basis of our home-made anion velocity map imaging apparatus. The Cl^-; product efficiency curve for dissociative electron attachment to 1,2-dichlorobenzene is obtained from 0.2 to 8 eV, meanwhile the sliced images of this anion are recorded at 1.2 and 6.0 eV corresponding to two peak positions of the product efficiency curve.
基金Project supported by the Zhejiang Provincial Natural Science Foundation of China(LQ23E060002)the National Natural Science Foundation of China(51976192)。
文摘The Mn-Ce-Fe mixed oxide(MCFe)was prepared by co-precipitation and the catalytic performance was tested by using 1,2-dichlorobenzene(1,2-DCB)and furan as model molecules of PCDD/F.The effect of O_(2)concentration,SO_(2) and NO on the catalytic activity was studied.At 270℃,the MCFe oxide catalyst presents significant simultaneous removal efficiency of 75.25%and 100%for 1,2-DCB and furan,respectively.Brunauer-Emmett-Teller(BET)method(BET),X-ray diffraction(XRD),scanning electron microscopy(SEM),X-ray photoelectron spectroscopy(XPS),Fourier transform infrared spectroscopy(FTIR),H_2-temperature programmed reduction(H_(2)-TPR),NH_(3)-temperature programmed desorption(NH_3-TPD)and O_(2)-TPD were used to characterize the catalysts before and after the reaction.Competition tests suggest that the oxidation behavior of furan occurred prior to that of 1,2-DCB.According to the intermediate products detected by gas chromatography-mass spectrometry(GC-MS),the by-products include chlorinated hydrocarbons,long-chain hydrocarbons,ketone,etc.Possible catalytic oxidation reaction paths are proposed.
基金supported by the Natural Science Foundation of Zhejiang Province(No.LY21E060007)the National Natural Science Foundation of China(No.51976192,No.52006191).
文摘In this study,Mn-based bimetallic oxide catalysts were synthesized via the solvothermal method.Different metals(Ce,Co and Fe)exhibited a great impact on the physicochemical properties of catalysts,resulting in different catalytic activities for the simultaneous removal of 1,2-dichlorobenzene(1,2-DCB)and furan,as a model of polychlorinated dibenzodioxins and dibenzo-furans(PCDD/Fs).Fe–MnOx presented the best catalytic activity,with a removal efficiency of 62%for 1,2-DCB and 100%for furan at 240℃.Several analytical techniques were employed,namely,Brunauer–Emmett–Teller(BET),X-ray diffraction(XRD),scanning electron microscope(SEM),X-ray photoelectron spectroscopy(XPS),H_(2)temperature-programmed reduction(H_(2)-TPR),and ammonia temperature programmed desorption(NH_(3)-TPD).Compared with pure MnOx catalysts,Fe–MnOx shows a higher specific surface area of 117.9 m^(2)/g.SEM observations showed flower-like nanosheet structures for Fe–MnOx.XPS analysis indicated that Mn^(4+)/Mn^(3+)and active oxygen play the key roles in the catalytic oxidation of 1,2-DCB and furan.The catalytic activity,selectivity and stability of Mn-based bimetallic oxide catalysts for the oxidation of 1,2-DCB and furan were tested.Competition exists between 1,2-DCB and furan such that the adsorption of furan occurs prior to 1,2-DCB.
文摘芝麻是八大类食物过敏原之一,快速准确识别芝麻过敏原对预防其过敏有重要意义。核酸适配体可以高效识别靶标过敏原,在过敏原检测中有良好的应用前景。为了获得芝麻主要过敏原Ses i 2的特异性核酸适体,本研究以Ses i 2为靶标,通过磁珠筛选法(磁珠-SELEX)开展10轮筛选,经由高通量测序获得6条候补序列(S1~S6),并进行家族性、同源性分析及二级结构预测。结果表明,6条候选核酸适体的重复率可达46.38%,其自由能在-9.02到-2.47 kcal·moL^(-1)之间,根据自由能能量稳定原则,S1和S5吉布斯自由能最低最稳定,分别为-6.70和-9.02 kcal·moL^(-1)。利用ELISA试验进行亲和力测试,结果表明核酸适体S1和S2的亲和能力较强,S1:KD=67.02 nmol·L^(-1),R2=0.925 8,S2:KD=97.65 nmol·L^(-1),R2=0.795 1。核酸适体S1与过敏原Ses i 2的结合力和其他过敏原蛋白相比有显著差异,可视为具有特异性。本研究最终获得一条兼具良好亲和力和特异性的核酸适体S1,为芝麻过敏原快速检测提供了技术支撑。
