The availability of chemical and biological data presented in this paper is the basis for understanding not only the current state of anti-cancer drugs based on gold(Ⅲ),but also the rationale for strategies for futur...The availability of chemical and biological data presented in this paper is the basis for understanding not only the current state of anti-cancer drugs based on gold(Ⅲ),but also the rationale for strategies for future drug design.New Au(Ⅲ)nanosized complexes of cefotaxime(ceph-3)and cefepime(ceph-4)ligands as a 3rd and 4th of cephalosporin generation drugs were synthesized.Gold(Ⅲ)complexes were discussed based on the elemental,molar conductance,thermal and magnetic moment measurements as well as spectral(FTIR,1HNMR,UV-Vis,and XRD)techniques.FT-IR spectra revealed that the ceph-3 and ceph-4 ligands reacted as a bidentate ligands through carboxylate oxygen andβ-lactam oxygen groups.The analytical analysis confirm that the molar ratio is 1∶1(Au 3+/ceph)with general formula[Au(L)(Cl)2]where L=ceph-3 or ceph-4.The structures of Au(Ⅲ)complexes were presence as a square planar geometry.X-ray diffraction patterns referred to a crystalline nature for all synthesized complexes.TEM analyses confirmed that the synthetic gold(Ⅲ)complexes have a nanosized particles.In vitro antimicrobial activities of Au(Ⅲ)complexes were evaluated towards two types of bacteria(G+&G-).The antitumor activities of gold(Ⅲ)complexes are appraised against breast(MCF-7)and colorectal adenocarcinoma(Caco-2)cell lines,which means that the two complexes may consider promising anticancer drugs.展开更多
Considering their superior theoretical capacity and low voltage plateau,bismuth(Bi)-based materials are being widely explored for application in potassium-ion batteries(PIBs).Unfortunately,pure Bi and Bibased compound...Considering their superior theoretical capacity and low voltage plateau,bismuth(Bi)-based materials are being widely explored for application in potassium-ion batteries(PIBs).Unfortunately,pure Bi and Bibased compounds suffer from severe electrochemical polarization,agglomeration,and dramatic volume fluctuations.To develop an advanced bismuth-based anode material with high reactivity and durability,in this work,the pyrolysis of Bi-based metal-organic frameworks and in-situ selenization techniques have been successfully used to produce a Bi-based composite with high capacity and unique structure,in which Bi/Bi_(3)Se_(4)nanoparticles are encapsulated in carbon nanorods(Bi/Bi_(3)Se_(4)@CNR).Applied as the anode material of PIBs,the Bi/Bi_(3)Se_(4)@CNR displays fast potassium storage capability with 307.5 m A h g^(-1)at 20 A g^(-1)and durable cycle performance of 2000 cycles at 5 A g^(-1).Notably,the Bi/Bi_(3)Se_(4)@CNR also showed long cycle stability over 1600 cycles when working in a full cell system with potassium vanadate as the cathode material,which further demonstrates its promising potential in the field of PIBs.Additionally,the dual potassium storage mechanism of the Bi/Bi_(3)Se_(4)@CNR based on conversion and alloying reaction has also been revealed by in-situ X-ray diffraction.展开更多
Simultaneous equilibrium was applied to the thermodynamic analysis and calculation of Bi（Ⅲ）-X（Cl-, NO-3）-H2O systems, based on which the diagrams of the logarithm of equilibrium concentration of Bi（Ⅲ） of serie...Simultaneous equilibrium was applied to the thermodynamic analysis and calculation of Bi（Ⅲ）-X（Cl-, NO-3）-H2O systems, based on which the diagrams of the logarithm of equilibrium concentration of Bi（Ⅲ） of series precipitation vs pH value of these two systems at 25 ℃ were obtained, and the pH ranges of the stable zones of various precipitations were analyzed and determined. In Bi（Ⅲ）-Cl--H2O system, the variations of c0(Bi3+) and （c0（Cl-）） have little effect on the equilibria of Bi（OH）3-solution and BiOOH-solution, but has great influence on the （equilibrium） of BiOCl-solution. However, in Bi（Ⅲ）-NO-3-H2O system, the variations of c0(Bi3+) and c0（NO-3） have little effect on equilibria of Bi（OH）3-solution, BiOOH-solution and Bi2O3-solution. When pH value is high, Bi2O3 is the thermodynamic stable phase, its stable zone is the widest, almost including the stable zones of BiOCl or （BiONO3,） （Bi（OH）3） and BiOOH. Bi（OH）3 cannot be obtained from Bi（Ⅲ）-Cl--H2O system, even strong alkaline media. Bi2O3 can be obtained from the solution directly, and highly pure BiOCl or BiONO3 can also be obtained through strictly controlling pH value.展开更多
The spherical macroporous cellulose(SMC) was fabricated using medical absorbent cotton as raw material and nano CaCO3 as porogenic agents.And then,the phenylglycine was grafted onto the SMC to obtain the novel spheric...The spherical macroporous cellulose(SMC) was fabricated using medical absorbent cotton as raw material and nano CaCO3 as porogenic agents.And then,the phenylglycine was grafted onto the SMC to obtain the novel spherical macroporous cellulose derivative adsorbent(PSMC).FT-IR and scanning electron microscope(SEM) were employed to characterize the adsorbents and Fe3+ ions served as model solute to evaluate the adsorption property of the adsorbents.The experimental results show that the amount of porogenic agents and the value of pH have obvious influence on adsorption capacity of the adsorbents.The data of adsorption kinetic and isotherm display that the adsorbents possess excellent equilibrium adsorption capacity(348.94 mg/g) and have a bright prospect and considerable potential in the treatment of Fe3+ ions in wastewater.展开更多
The mechanism of adsorbing indium(Ⅲ) from sulfate solutions with CL-P204Levextrel resin containing di(-2-ethylhexyl) phosphoric acid was examined by batch operation andinfrared spectra. The results showed that the P2...The mechanism of adsorbing indium(Ⅲ) from sulfate solutions with CL-P204Levextrel resin containing di(-2-ethylhexyl) phosphoric acid was examined by batch operation andinfrared spectra. The results showed that the P204 adsorbed on the resin behaved in the similar wayto solvent extraction except that it was as a monomer in resin adsorbing but in dimeric form insolvent extraction. Three factors including temperature, indium(Ⅲ) concentration of solution, andthe size of resin particles which influence the In^(3+)/H^+ exchange on CL-P204 Levextrel resin wereinvestigated by the modified limited batch technique in order to determine the kinetics ofIn^(3+)/H^+ exchange. It was found that the rate of ion exchange increased with the temperature andthe concentration of solution increasing and with the size of the resin particles decreasing.According to the expression developed by Boyd et al., the controlling factor of In^(3+)/H^+ exchangeon CL-P204 Levextrel resin was the diffusion through the resin particles. The effective diffusioncoefficient, activation energy, and entropy of activation in the particle-diffusion were determinedas 1.57 x 10^(-10) m^2/s, 11.9 kJ/mol, -84.1 J/(mol·K), respectively.展开更多
Humic substances are ubiquitous redox-active organic compounds of environment. In this study, experiments were conducted to determine the reduction capacity of humic acid in the man-ix of bromate and Fe（Ⅲ） solution...Humic substances are ubiquitous redox-active organic compounds of environment. In this study, experiments were conducted to determine the reduction capacity of humic acid in the man-ix of bromate and Fe（Ⅲ） solutions and the role of Fe（Ⅲ） in this redox process. The results showed that the humic acid regenerated Fe（Ⅱ） and reduced bromate abiotically. The addition of Fe（Ⅲ） could accelerate the bromate reduction rate by forming humic acid-Fe（Ⅲ） complexes. Iron species acts as electron mediator and catalyst for the bromate reduction by humic acid, in which humic acid transfers electrons to the complexed Fe（Ⅲ） to form Fe（Ⅱ）, and the regenerated Fe（Ⅱ） donate the electrons to bromate. The kinetics study on bromate reduction further indicated that bromate reduction by humic acid-Fe（Ⅲ） complexes is pH dependent. The rate decreased by 2-fold with the increase in solution pH by one unit. The reduction capacity of Aldrich humic acid was observed to be lower than that of humic acid or natural organic matter of Suwanne River, indicating that such redox process is expected to occur in the environment.展开更多
In this study, the kinetics and mechanism of the iridium（ Ⅲ ） -catalyzed oxidation of ethanol amine（EAN） by cerium（Ⅳ） in a sulfuric acid medium was investigated using titrimetric technique of redox in a temper...In this study, the kinetics and mechanism of the iridium（ Ⅲ ） -catalyzed oxidation of ethanol amine（EAN） by cerium（Ⅳ） in a sulfuric acid medium was investigated using titrimetric technique of redox in a temperature range of 298--313 K. It was found that the reaction is of first order with respect to Ce（ Ⅳ ） and It（ Ⅲ ）, and a positive fractional order with respect to EAN. It was also found that the pseudo-first-order （ [EAN ] 〉〉 [ Ce （ Ⅳ） ] ） rate constant koba decreases with the increase of [ H^＋ ] and [ HSO^-4 ]. Under the protection of nitrogen gas, the reaction system can initiate the polymerization of acrylonitrile, indicating the generation of free radicals. On the basis of the experimental results, a suitable mechanism was proposed. From the dependence of koba on the concentration of hydrogen sulfate, Ce（SO4）2 was found to be the kinetically active species. The rate constants of the rote-determining step together with the activation parameters were evaluated.展开更多
基金the Deanship of Scientific Research at Princess Nourah bint Abdulrahman University,through the Research Funding Program(#RFP-1440-3)。
文摘The availability of chemical and biological data presented in this paper is the basis for understanding not only the current state of anti-cancer drugs based on gold(Ⅲ),but also the rationale for strategies for future drug design.New Au(Ⅲ)nanosized complexes of cefotaxime(ceph-3)and cefepime(ceph-4)ligands as a 3rd and 4th of cephalosporin generation drugs were synthesized.Gold(Ⅲ)complexes were discussed based on the elemental,molar conductance,thermal and magnetic moment measurements as well as spectral(FTIR,1HNMR,UV-Vis,and XRD)techniques.FT-IR spectra revealed that the ceph-3 and ceph-4 ligands reacted as a bidentate ligands through carboxylate oxygen andβ-lactam oxygen groups.The analytical analysis confirm that the molar ratio is 1∶1(Au 3+/ceph)with general formula[Au(L)(Cl)2]where L=ceph-3 or ceph-4.The structures of Au(Ⅲ)complexes were presence as a square planar geometry.X-ray diffraction patterns referred to a crystalline nature for all synthesized complexes.TEM analyses confirmed that the synthetic gold(Ⅲ)complexes have a nanosized particles.In vitro antimicrobial activities of Au(Ⅲ)complexes were evaluated towards two types of bacteria(G+&G-).The antitumor activities of gold(Ⅲ)complexes are appraised against breast(MCF-7)and colorectal adenocarcinoma(Caco-2)cell lines,which means that the two complexes may consider promising anticancer drugs.
基金financially supported by the National Natural Science Foundation of China (22209057)the Guangdong Basic and Applied Basic Research Foundation (2021A1515010362)+1 种基金the Guangzhou Basic and Applied Basic Research Foundation (202102020995)the Open Fund of Guangdong Provincial Key Laboratory of Functional Supramolecular Coordination Materials and Applications (2020B121201005)。
文摘Considering their superior theoretical capacity and low voltage plateau,bismuth(Bi)-based materials are being widely explored for application in potassium-ion batteries(PIBs).Unfortunately,pure Bi and Bibased compounds suffer from severe electrochemical polarization,agglomeration,and dramatic volume fluctuations.To develop an advanced bismuth-based anode material with high reactivity and durability,in this work,the pyrolysis of Bi-based metal-organic frameworks and in-situ selenization techniques have been successfully used to produce a Bi-based composite with high capacity and unique structure,in which Bi/Bi_(3)Se_(4)nanoparticles are encapsulated in carbon nanorods(Bi/Bi_(3)Se_(4)@CNR).Applied as the anode material of PIBs,the Bi/Bi_(3)Se_(4)@CNR displays fast potassium storage capability with 307.5 m A h g^(-1)at 20 A g^(-1)and durable cycle performance of 2000 cycles at 5 A g^(-1).Notably,the Bi/Bi_(3)Se_(4)@CNR also showed long cycle stability over 1600 cycles when working in a full cell system with potassium vanadate as the cathode material,which further demonstrates its promising potential in the field of PIBs.Additionally,the dual potassium storage mechanism of the Bi/Bi_(3)Se_(4)@CNR based on conversion and alloying reaction has also been revealed by in-situ X-ray diffraction.
文摘Simultaneous equilibrium was applied to the thermodynamic analysis and calculation of Bi（Ⅲ）-X（Cl-, NO-3）-H2O systems, based on which the diagrams of the logarithm of equilibrium concentration of Bi（Ⅲ） of series precipitation vs pH value of these two systems at 25 ℃ were obtained, and the pH ranges of the stable zones of various precipitations were analyzed and determined. In Bi（Ⅲ）-Cl--H2O system, the variations of c0(Bi3+) and （c0（Cl-）） have little effect on the equilibria of Bi（OH）3-solution and BiOOH-solution, but has great influence on the （equilibrium） of BiOCl-solution. However, in Bi（Ⅲ）-NO-3-H2O system, the variations of c0(Bi3+) and c0（NO-3） have little effect on equilibria of Bi（OH）3-solution, BiOOH-solution and Bi2O3-solution. When pH value is high, Bi2O3 is the thermodynamic stable phase, its stable zone is the widest, almost including the stable zones of BiOCl or （BiONO3,） （Bi（OH）3） and BiOOH. Bi（OH）3 cannot be obtained from Bi（Ⅲ）-Cl--H2O system, even strong alkaline media. Bi2O3 can be obtained from the solution directly, and highly pure BiOCl or BiONO3 can also be obtained through strictly controlling pH value.
基金Projects(81373284,81102344) supported by the National Natural Science Foundation of China
文摘The spherical macroporous cellulose(SMC) was fabricated using medical absorbent cotton as raw material and nano CaCO3 as porogenic agents.And then,the phenylglycine was grafted onto the SMC to obtain the novel spherical macroporous cellulose derivative adsorbent(PSMC).FT-IR and scanning electron microscope(SEM) were employed to characterize the adsorbents and Fe3+ ions served as model solute to evaluate the adsorption property of the adsorbents.The experimental results show that the amount of porogenic agents and the value of pH have obvious influence on adsorption capacity of the adsorbents.The data of adsorption kinetic and isotherm display that the adsorbents possess excellent equilibrium adsorption capacity(348.94 mg/g) and have a bright prospect and considerable potential in the treatment of Fe3+ ions in wastewater.
文摘The mechanism of adsorbing indium(Ⅲ) from sulfate solutions with CL-P204Levextrel resin containing di(-2-ethylhexyl) phosphoric acid was examined by batch operation andinfrared spectra. The results showed that the P204 adsorbed on the resin behaved in the similar wayto solvent extraction except that it was as a monomer in resin adsorbing but in dimeric form insolvent extraction. Three factors including temperature, indium(Ⅲ) concentration of solution, andthe size of resin particles which influence the In^(3+)/H^+ exchange on CL-P204 Levextrel resin wereinvestigated by the modified limited batch technique in order to determine the kinetics ofIn^(3+)/H^+ exchange. It was found that the rate of ion exchange increased with the temperature andthe concentration of solution increasing and with the size of the resin particles decreasing.According to the expression developed by Boyd et al., the controlling factor of In^(3+)/H^+ exchangeon CL-P204 Levextrel resin was the diffusion through the resin particles. The effective diffusioncoefficient, activation energy, and entropy of activation in the particle-diffusion were determinedas 1.57 x 10^(-10) m^2/s, 11.9 kJ/mol, -84.1 J/(mol·K), respectively.
基金supported by the National Natural Science Foundation of China(No.50608056)the Hong Kong Research Grants(No.HKUST6106/03E)the Program for Young Excellent Talents in Tongji University in part(No.2006KJ033).
文摘Humic substances are ubiquitous redox-active organic compounds of environment. In this study, experiments were conducted to determine the reduction capacity of humic acid in the man-ix of bromate and Fe（Ⅲ） solutions and the role of Fe（Ⅲ） in this redox process. The results showed that the humic acid regenerated Fe（Ⅱ） and reduced bromate abiotically. The addition of Fe（Ⅲ） could accelerate the bromate reduction rate by forming humic acid-Fe（Ⅲ） complexes. Iron species acts as electron mediator and catalyst for the bromate reduction by humic acid, in which humic acid transfers electrons to the complexed Fe（Ⅲ） to form Fe（Ⅱ）, and the regenerated Fe（Ⅱ） donate the electrons to bromate. The kinetics study on bromate reduction further indicated that bromate reduction by humic acid-Fe（Ⅲ） complexes is pH dependent. The rate decreased by 2-fold with the increase in solution pH by one unit. The reduction capacity of Aldrich humic acid was observed to be lower than that of humic acid or natural organic matter of Suwanne River, indicating that such redox process is expected to occur in the environment.
基金Supported by the Doctoral Foundation of Education Department of Hebei Province(NoB2004205) Hebei University Re-search Foundation(No2003Z09)
文摘In this study, the kinetics and mechanism of the iridium（ Ⅲ ） -catalyzed oxidation of ethanol amine（EAN） by cerium（Ⅳ） in a sulfuric acid medium was investigated using titrimetric technique of redox in a temperature range of 298--313 K. It was found that the reaction is of first order with respect to Ce（ Ⅳ ） and It（ Ⅲ ）, and a positive fractional order with respect to EAN. It was also found that the pseudo-first-order （ [EAN ] 〉〉 [ Ce （ Ⅳ） ] ） rate constant koba decreases with the increase of [ H^＋ ] and [ HSO^-4 ]. Under the protection of nitrogen gas, the reaction system can initiate the polymerization of acrylonitrile, indicating the generation of free radicals. On the basis of the experimental results, a suitable mechanism was proposed. From the dependence of koba on the concentration of hydrogen sulfate, Ce（SO4）2 was found to be the kinetically active species. The rate constants of the rote-determining step together with the activation parameters were evaluated.
