应用紫外-可见分光光度法(Ultraviolet and visible spectrophotometry,UV-Vis),圆二色谱法(Circular di-chroism,CD)和聚丙烯酰胺凝胶电泳法(Polyacrylamide gel electrophoresis,PAGE)研究了在不同阳离子溶液中形成G-四联体的构型及...应用紫外-可见分光光度法(Ultraviolet and visible spectrophotometry,UV-Vis),圆二色谱法(Circular di-chroism,CD)和聚丙烯酰胺凝胶电泳法(Polyacrylamide gel electrophoresis,PAGE)研究了在不同阳离子溶液中形成G-四联体的构型及其与蒽醌衍生物的相互作用方式。研究发现,不同取代基的蒽醌衍生物在溶液中与G-四联体有不同的相互作用方式及可能的光敏损伤机制,其中AQS2以嵌入的方式与G-四联体相结合而2,7-AQS2则是沟渠结合。展开更多
Anthraquinone-2-sulfonate（AQS） was employed in humus substitutes to evaluate the effects and influencing factors of U（VI） reduction by Shewanella oneidensis MR-1（S. oneidensis MR-1） under anaerobic condition. Th...Anthraquinone-2-sulfonate（AQS） was employed in humus substitutes to evaluate the effects and influencing factors of U（VI） reduction by Shewanella oneidensis MR-1（S. oneidensis MR-1） under anaerobic condition. The removal rate of U（VI） at 30 °C reaches 99.0% afterd 96 h with the p H value of 7.0 and AQS concentration of 1.0 mmol/L. The effective concentrations of AQS as the accelerator for U（VI） bioreduction are approximately 0.5-1.0 mmol/L. The bioreduction of U（VI） is inhibited when the concentration of AQS exceeds 2.0 mmol/L. The coexistence of ions, such as Cu2＋, Cr6＋, Mn2＋, shows a remarkable negative effect on the U（VI） reduction, and Zn2＋ shows less influence on the process compared with other tested ions. The U（VI） reduction is remarkably inhibited when the concentration of nitrate ion exceeds 1.0 mmol/L. Otherwise, no difference is found when the nitrate ion concentration is less than 0.5 mmol/L. Sulfate ion（5.0 mmol/L） slightly promotes the U（VI） reduction. Zero-valent iron（ZVI） promotes the U（VI） reduction by S. oneidensis, and the reduction rate improves with increasing the amount of ZVI in the range of 0-2.0 g/L. The XPS result indicates that uranium deposits on the cell surface are in U（VI） and U（IV） forms, and the majority of uranium in the solution is stable UO2.展开更多
Chlorination has been intensively investigated for use in water disinfection and pollutant elimination due to its efficacy and convenience;however,the generation and transportation of chlorine and hypochlorite are ene...Chlorination has been intensively investigated for use in water disinfection and pollutant elimination due to its efficacy and convenience;however,the generation and transportation of chlorine and hypochlorite are energy-consuming and complicated.In this study,a novel binary photosensitizer consisting of anthraquinone-2-sulfonate(AQ2S)and graphene was synthesized via a p-p stack adsorption method;this compound could allow for the chlorination of organic pollutants using on-site chlorine generation.In this photosensitive degradation process,sulfapyridine(SPY)was selected as a model pollutant and was decomposed by the reactive species(Cl2-,Cland O2-)generated during the photosensitive oxidation of chloride.The synthesized AQ2S/graphene exhibited superior activity,and the degradation rate of SPY was over 90%after 12 h of visible light irradiation with a kinetic constant of 0.2034h1.Results show that 20 mg AQ2S/GR at a 21%weight percentage of AQ2S in a pH 7 SPY solution with 1 mol/L Clachieved the highest kinetics rate at 0.353 h1.Free radical trapping experiments demonstrated that Cl2-and O2-were the dominant species involved in SPY decomposition under solar light.The reusability and stability of this composite were verified by conducting a cycle experiment over five successive runs.The capacity of photodegradation still remained over 90%after these 5 runs.The current study provides an energyefficient and simple-operational approach for water phase SPY control.展开更多
文摘应用紫外-可见分光光度法(Ultraviolet and visible spectrophotometry,UV-Vis),圆二色谱法(Circular di-chroism,CD)和聚丙烯酰胺凝胶电泳法(Polyacrylamide gel electrophoresis,PAGE)研究了在不同阳离子溶液中形成G-四联体的构型及其与蒽醌衍生物的相互作用方式。研究发现,不同取代基的蒽醌衍生物在溶液中与G-四联体有不同的相互作用方式及可能的光敏损伤机制,其中AQS2以嵌入的方式与G-四联体相结合而2,7-AQS2则是沟渠结合。
基金Projects(1117508111475080)supported by the National Natural Science Foundation of China+3 种基金project(13JJ3078)supported by the Natural Science Foundation of Hunan ProvinceChinaProject(14k083)supported by the Innovation Platform Open Fund Project of University in Hunan ProvinceChina
文摘Anthraquinone-2-sulfonate（AQS） was employed in humus substitutes to evaluate the effects and influencing factors of U（VI） reduction by Shewanella oneidensis MR-1（S. oneidensis MR-1） under anaerobic condition. The removal rate of U（VI） at 30 °C reaches 99.0% afterd 96 h with the p H value of 7.0 and AQS concentration of 1.0 mmol/L. The effective concentrations of AQS as the accelerator for U（VI） bioreduction are approximately 0.5-1.0 mmol/L. The bioreduction of U（VI） is inhibited when the concentration of AQS exceeds 2.0 mmol/L. The coexistence of ions, such as Cu2＋, Cr6＋, Mn2＋, shows a remarkable negative effect on the U（VI） reduction, and Zn2＋ shows less influence on the process compared with other tested ions. The U（VI） reduction is remarkably inhibited when the concentration of nitrate ion exceeds 1.0 mmol/L. Otherwise, no difference is found when the nitrate ion concentration is less than 0.5 mmol/L. Sulfate ion（5.0 mmol/L） slightly promotes the U（VI） reduction. Zero-valent iron（ZVI） promotes the U（VI） reduction by S. oneidensis, and the reduction rate improves with increasing the amount of ZVI in the range of 0-2.0 g/L. The XPS result indicates that uranium deposits on the cell surface are in U（VI） and U（IV） forms, and the majority of uranium in the solution is stable UO2.
基金This work was supported by the National Key Research and Development Program of China(2019YFD1100204)the National Nature Science Foundation of China(No.51778175)the Research and Application of Treatment Technology for High Concentration and Refractory Wastewater(Printing and Dyeing,Pharmaceutical,Chemical)GJSZ2021030907-YF.We gratefully acknowledge supports from Heilongjiang Province touyan team.
文摘Chlorination has been intensively investigated for use in water disinfection and pollutant elimination due to its efficacy and convenience;however,the generation and transportation of chlorine and hypochlorite are energy-consuming and complicated.In this study,a novel binary photosensitizer consisting of anthraquinone-2-sulfonate(AQ2S)and graphene was synthesized via a p-p stack adsorption method;this compound could allow for the chlorination of organic pollutants using on-site chlorine generation.In this photosensitive degradation process,sulfapyridine(SPY)was selected as a model pollutant and was decomposed by the reactive species(Cl2-,Cland O2-)generated during the photosensitive oxidation of chloride.The synthesized AQ2S/graphene exhibited superior activity,and the degradation rate of SPY was over 90%after 12 h of visible light irradiation with a kinetic constant of 0.2034h1.Results show that 20 mg AQ2S/GR at a 21%weight percentage of AQ2S in a pH 7 SPY solution with 1 mol/L Clachieved the highest kinetics rate at 0.353 h1.Free radical trapping experiments demonstrated that Cl2-and O2-were the dominant species involved in SPY decomposition under solar light.The reusability and stability of this composite were verified by conducting a cycle experiment over five successive runs.The capacity of photodegradation still remained over 90%after these 5 runs.The current study provides an energyefficient and simple-operational approach for water phase SPY control.
