Iodine is widely used in aqueous zinc batteries(ZBs)due to its abundant resources,low cost,and active redox reactions.In addition to the active material in zinc-iodine batteries,iodine also plays an important role in ...Iodine is widely used in aqueous zinc batteries(ZBs)due to its abundant resources,low cost,and active redox reactions.In addition to the active material in zinc-iodine batteries,iodine also plays an important role in other ZBs,such as regulating the electrochemical behavior of zinc ions,promoting the reaction kinetic and reversibility of other redox pairs,catalytic behaviors related to iodine reactions,coupling with other halogen ions,shuttle behaviors of polyiodides,etc.However,there is currently a lack of comprehensive discussion on these aspects.Here,this review provides a comprehensive overview of the electrochemical behaviors of iodide in the aqueous ZBs.The effect of iodine ions on the Zn^(2+)desolvation behaviors and the interfacial behaviors of Zn anode was summarized.Iodine redox pairs boosting other redox pairs,such as MnO_(2)/Mn^(2+)redox pair and vanadium redox pair to obtain high reversibility and capacity was also discussed.Moreover,the catalytic behaviors related to iodine reactions in aqueous ZBs,synergistic reaction with other halogen ions and suppression of shuttle behaviors for high performance zinc-iodine batteries were systematically analyzed.Finally,future prospects for designing effective iodine electrochemical behaviors with practicability are proposed,which will provide scientific guidance for the practical application of iodine-related aqueous ZBs.展开更多
A simple, precise and accurate kinetic spectro-photometric method for determination of ce-fradine anhydrous, cefaclor monohydrate, ce-fadroxil monohydrate, cefalexin anhydrous and cefixime in bulk and in pharmaceutica...A simple, precise and accurate kinetic spectro-photometric method for determination of ce-fradine anhydrous, cefaclor monohydrate, ce-fadroxil monohydrate, cefalexin anhydrous and cefixime in bulk and in pharmaceutical formula-tions has been developed. The method based on a kinetic investigation of the reaction of the free carboxylic acid group of the drug with a mixture of potassium iodate and potassium iodide at room temperature to form yellow coloured triiodide ions. The reaction was followed up spectrophotometrically by measuring the increase in absorbance at 352 nm as a function of time. The initial rate, fixed time, variable time and rate-constant methods were adopted for constructing the calibration curves but fixed time method has been found to be more applicable. The analytical performance of the method, in terms of accuracy and precision, was statistically validated;the results were satisfactory. The method has been successfully applied to the determination of the studied drugs in commercial pharmaceutical formulations. Statistical comparison of the results with a well established reported method showed excellent ag- reement and proved that there is no significant difference in the accuracy and precision.展开更多
Research into controlling the self-assembly of discrete porous organic cages(POCs)with specific geometries and functions is difficult,but important for understanding their structure-property relationship,as well as se...Research into controlling the self-assembly of discrete porous organic cages(POCs)with specific geometries and functions is difficult,but important for understanding their structure-property relationship,as well as self-assembly behavior in supramolecular chemistry.Herein,we report the self-assembly of two POCs based on the same tetraformyl-functionalized calix[4]resorcinarene(C4RACHO)and 2,4-diaminophenol dihydrochloride(DAP)organic building blocks,including a[3+6]triangular prism(CPOC-201-OH)and a[4+8]square prism(CPOC-401-OH),as determined by single X-ray crystallographic analysis.Both POCs exhibit large intrinsic cavities,rich oxygen sites,and high porosity with Brunauer-Emmett-Teller(BET)specific surface areas up to 966 m^(2)·g^(-1).Owing to such virtues,both cages can effectively capture iodine in aqueous media with removal rate>99%within 2 min.展开更多
基金supported by the Natural Science Foundation of Xinjiang Uygur Autonomous Region(Grant No.2023D01C168)Scientific Research Program of the Higher Education Institution of Xinjiang(Grant No.XJEDU2022P001)+1 种基金Autonomous Region"Tianchi Talent"Introduction Program Youth Doctoral Program(Grant No.51052401544)Tianshan Innovation Team Program of Xinjiang Uygur Autonomous Region(Grant No.2023D14001).
文摘Iodine is widely used in aqueous zinc batteries(ZBs)due to its abundant resources,low cost,and active redox reactions.In addition to the active material in zinc-iodine batteries,iodine also plays an important role in other ZBs,such as regulating the electrochemical behavior of zinc ions,promoting the reaction kinetic and reversibility of other redox pairs,catalytic behaviors related to iodine reactions,coupling with other halogen ions,shuttle behaviors of polyiodides,etc.However,there is currently a lack of comprehensive discussion on these aspects.Here,this review provides a comprehensive overview of the electrochemical behaviors of iodide in the aqueous ZBs.The effect of iodine ions on the Zn^(2+)desolvation behaviors and the interfacial behaviors of Zn anode was summarized.Iodine redox pairs boosting other redox pairs,such as MnO_(2)/Mn^(2+)redox pair and vanadium redox pair to obtain high reversibility and capacity was also discussed.Moreover,the catalytic behaviors related to iodine reactions in aqueous ZBs,synergistic reaction with other halogen ions and suppression of shuttle behaviors for high performance zinc-iodine batteries were systematically analyzed.Finally,future prospects for designing effective iodine electrochemical behaviors with practicability are proposed,which will provide scientific guidance for the practical application of iodine-related aqueous ZBs.
文摘A simple, precise and accurate kinetic spectro-photometric method for determination of ce-fradine anhydrous, cefaclor monohydrate, ce-fadroxil monohydrate, cefalexin anhydrous and cefixime in bulk and in pharmaceutical formula-tions has been developed. The method based on a kinetic investigation of the reaction of the free carboxylic acid group of the drug with a mixture of potassium iodate and potassium iodide at room temperature to form yellow coloured triiodide ions. The reaction was followed up spectrophotometrically by measuring the increase in absorbance at 352 nm as a function of time. The initial rate, fixed time, variable time and rate-constant methods were adopted for constructing the calibration curves but fixed time method has been found to be more applicable. The analytical performance of the method, in terms of accuracy and precision, was statistically validated;the results were satisfactory. The method has been successfully applied to the determination of the studied drugs in commercial pharmaceutical formulations. Statistical comparison of the results with a well established reported method showed excellent ag- reement and proved that there is no significant difference in the accuracy and precision.
基金supported by the National Nature Science Foundation of China(22071244,22275191)Youth Innovation Promotion Association CAS(2022305)+1 种基金Natural Science Foundation of Fujian Province of China(2022J01503,2020J05087)Self-deployment Project Research Program of Haixi Institutes,Chinese Academy of Sciences(CXZX-2022-GH01).
文摘Research into controlling the self-assembly of discrete porous organic cages(POCs)with specific geometries and functions is difficult,but important for understanding their structure-property relationship,as well as self-assembly behavior in supramolecular chemistry.Herein,we report the self-assembly of two POCs based on the same tetraformyl-functionalized calix[4]resorcinarene(C4RACHO)and 2,4-diaminophenol dihydrochloride(DAP)organic building blocks,including a[3+6]triangular prism(CPOC-201-OH)and a[4+8]square prism(CPOC-401-OH),as determined by single X-ray crystallographic analysis.Both POCs exhibit large intrinsic cavities,rich oxygen sites,and high porosity with Brunauer-Emmett-Teller(BET)specific surface areas up to 966 m^(2)·g^(-1).Owing to such virtues,both cages can effectively capture iodine in aqueous media with removal rate>99%within 2 min.
