Tackling the problem of poor conductivity and catalytic stability of pristine metal-organic frameworks(MOFs) is crucial to improve their oxygen evolution reaction(OER) performance.Herein,we introduce a novel strategy ...Tackling the problem of poor conductivity and catalytic stability of pristine metal-organic frameworks(MOFs) is crucial to improve their oxygen evolution reaction(OER) performance.Herein,we introduce a novel strategy of dysprosium(Dy) doping,using the unique 4f orbitals of this rare earth element to enhance electrocatalytic activity of MOFs.Our method involves constructing Dy-doped Ni-MOF(Dy@Ni-MOF) nanoneedles on carbon cloth via a Dy-induced valence electronic perturbation approach.Experiments and density functional theory(DFT) calculations reveal that Dy doping can effectively modify the electronic structure of the Ni active centers and foster a strong electronic interaction between Ni and Dy.The resulting benefits include a reduced work function and a closer proximity of the d-band center to the Fermi level,which is conducive to improving electrical conductivity and promoting the adsorption of oxygen-containing intermediates.Furthermore,the Dy@Ni-MOF achieves superhydrophilicity,ensuring effective electrolyte contact and thus accelerating reaction kinetics,Ex-situ and in-situ analysis results manifest Dy_(2)O_(3)/NiOOH as the actual active species.Therefore,Dy@Ni-MOF shows impressive OER performance,significantly surpassing Ni-MOF.Besides,the overall water splitting device with Dy@NiMOF as an anode delivers a low cell voltage of 1.51 V at 10 mA cm^(-2) and demonstrates long-term stability for 100 h,positioning it as a promising substitute for precious metal catalysts.展开更多
The textile industry generates large volumes of waste throughout its production process.Most of this waste is colored,therefore,discoloration is an important step toward recycling and reusing this waste.This study foc...The textile industry generates large volumes of waste throughout its production process.Most of this waste is colored,therefore,discoloration is an important step toward recycling and reusing this waste.This study focused on the chemical reductive discoloration of textile waste composed of cotton dyed with reactive dye.The experimental design demonstrated the significant influence of the concentration of reducing agent and time of reaction on the degree of whiteness of the cotton fibers.The concentration of the alkaline agent was not significant in the process.The optimization of the reaction conditions lead to Berger degree of 50.5±3.5.The discolored cotton was chemically recycled through dissolution in ionic liquid 1-ethyl-3-methylimidazolium chloride and regeneration in film form in water.The microstructure of the regenerated cellulose films was evaluated by Scanning Electron Microscopy(SEM)indicating complete dissolution and uniform regeneration.The discoloration process reduced the polymerization degree and crystallinity index of the cotton fibers but retained the cellulose I structure.The dissolution and cellulose regeneration process results in transparent films with an amorphous structure.The thermal behavior,evaluated by thermogravimetric analysis,indicated that residues and regenerated film presented a main decomposition step.The maximum decomposition rate temperature of the regenerated films was approximately 40℃lower than the cotton fibers,which correlates well with the reduction in polymerization degree and amorphous structure.In general,the study demonstrated that textile cotton waste dyed with reactive dyes can be chemically discolored to form transparent and amorphous films,contributing to the development of sustainable strategies for the textile industry.展开更多
Objective: Type 1 diabetes mellitus (T1D) and dyslipidemia (DLP) increase the risk of cardiovascular disease (CVD). The objective of this study was to evaluate the progress and perspective of dyslipidemia in young T1D...Objective: Type 1 diabetes mellitus (T1D) and dyslipidemia (DLP) increase the risk of cardiovascular disease (CVD). The objective of this study was to evaluate the progress and perspective of dyslipidemia in young T1D patients . Materials and Methods: The study was cross-sectional and descriptive design. Medical records of T1D patients were followed at an endocrinology service from 2008-2014. The collected data included gender, age, duration of T1D, body mass index (BMI), glycated hemoglobin (HbA1c), total cholesterol (TC), HDL, LDL and triglycerides (TG). Results: 126 T1D patients were recruited: 69 male (54.8%) and 57 female (45.2%) with a mean of age 16.4 (±0.18) and 16.5 (±0.18), respectively. Diabetes duration and baseline HbA1c were 14.82 (±2.11) and 8.68 (±1.21), respectively. The HbA1c (average range of HbA1c 6.5% to 10.7%) increased significantly while following five years by 2.9% (p < 0.001). The prevalence of overweight and obese teens was increasing from the 1st year to the following five years later. In contrast, the underweight and healthy subjects were decreasing for the same subsequent years. Means of HbA1c were significantly higher among overweight and obese categories throughout following years. All lipid profile revealed significant increase during five years follow-up study. The prevalence of risk TC/HDL ratio (< 4.1) gradually raised in the last year follow-up by 52.1% comparing to the baseline risk ratio (0.8%). The study of TC/HDL ratio with BMI categories revealed that average T1D patients had an ideal ratio (n = 97) in the 1st year measurement. After five years follow-up study, the frequency of ideal ratio declined among all categories in the same rate. Risk TC/HDL ratio in the last year of the study showed that average group had more risk ratio measurements (n = 47) in contrast to the 1st year measurement (n = 1). The significant positive correlations were reported between HbA1c and DLP as shown in figure (r2 = 0.85). HbA1c and BMI percentile analyses during long follow-up years werevery highly significant differences (p < 0.0001) between the categories BMI in each year and from one year to another. Conclusion: Attention must be given to control DLP and other comorbidities among T1D adolescents to decrease diabetes macrovascular and microvascular complications.展开更多
基金supported by the National Natural Science Foundation of China(52363028,21965005)the Natural Science Foundation of Guangxi Province(2021GXNSFAA076001)the Guangxi Technology Base and Talent Subject(GUIKE AD18126001,GUIKE AD20297039)。
文摘Tackling the problem of poor conductivity and catalytic stability of pristine metal-organic frameworks(MOFs) is crucial to improve their oxygen evolution reaction(OER) performance.Herein,we introduce a novel strategy of dysprosium(Dy) doping,using the unique 4f orbitals of this rare earth element to enhance electrocatalytic activity of MOFs.Our method involves constructing Dy-doped Ni-MOF(Dy@Ni-MOF) nanoneedles on carbon cloth via a Dy-induced valence electronic perturbation approach.Experiments and density functional theory(DFT) calculations reveal that Dy doping can effectively modify the electronic structure of the Ni active centers and foster a strong electronic interaction between Ni and Dy.The resulting benefits include a reduced work function and a closer proximity of the d-band center to the Fermi level,which is conducive to improving electrical conductivity and promoting the adsorption of oxygen-containing intermediates.Furthermore,the Dy@Ni-MOF achieves superhydrophilicity,ensuring effective electrolyte contact and thus accelerating reaction kinetics,Ex-situ and in-situ analysis results manifest Dy_(2)O_(3)/NiOOH as the actual active species.Therefore,Dy@Ni-MOF shows impressive OER performance,significantly surpassing Ni-MOF.Besides,the overall water splitting device with Dy@NiMOF as an anode delivers a low cell voltage of 1.51 V at 10 mA cm^(-2) and demonstrates long-term stability for 100 h,positioning it as a promising substitute for precious metal catalysts.
基金supportad by Fundação de AmparoàPesquisa e Inovação do Estado de Santa Caturina(FAPESC)(Grant Number 2021TR000327)by the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior-Brasil(CAPES)-Finance Code 001.
文摘The textile industry generates large volumes of waste throughout its production process.Most of this waste is colored,therefore,discoloration is an important step toward recycling and reusing this waste.This study focused on the chemical reductive discoloration of textile waste composed of cotton dyed with reactive dye.The experimental design demonstrated the significant influence of the concentration of reducing agent and time of reaction on the degree of whiteness of the cotton fibers.The concentration of the alkaline agent was not significant in the process.The optimization of the reaction conditions lead to Berger degree of 50.5±3.5.The discolored cotton was chemically recycled through dissolution in ionic liquid 1-ethyl-3-methylimidazolium chloride and regeneration in film form in water.The microstructure of the regenerated cellulose films was evaluated by Scanning Electron Microscopy(SEM)indicating complete dissolution and uniform regeneration.The discoloration process reduced the polymerization degree and crystallinity index of the cotton fibers but retained the cellulose I structure.The dissolution and cellulose regeneration process results in transparent films with an amorphous structure.The thermal behavior,evaluated by thermogravimetric analysis,indicated that residues and regenerated film presented a main decomposition step.The maximum decomposition rate temperature of the regenerated films was approximately 40℃lower than the cotton fibers,which correlates well with the reduction in polymerization degree and amorphous structure.In general,the study demonstrated that textile cotton waste dyed with reactive dyes can be chemically discolored to form transparent and amorphous films,contributing to the development of sustainable strategies for the textile industry.
基金National Natural Science Foundation of China(51872286,51832007)Fujian Science&Technology Innovation Laboratory for Optoelectronic Information of China(2021ZR204)+1 种基金Science and Technology Plan Leading Project of Fujian Province(2022H0043,2020H0036)Natural Science Foundation of Jiangxi Province(20181BAB211009)。
文摘Objective: Type 1 diabetes mellitus (T1D) and dyslipidemia (DLP) increase the risk of cardiovascular disease (CVD). The objective of this study was to evaluate the progress and perspective of dyslipidemia in young T1D patients . Materials and Methods: The study was cross-sectional and descriptive design. Medical records of T1D patients were followed at an endocrinology service from 2008-2014. The collected data included gender, age, duration of T1D, body mass index (BMI), glycated hemoglobin (HbA1c), total cholesterol (TC), HDL, LDL and triglycerides (TG). Results: 126 T1D patients were recruited: 69 male (54.8%) and 57 female (45.2%) with a mean of age 16.4 (±0.18) and 16.5 (±0.18), respectively. Diabetes duration and baseline HbA1c were 14.82 (±2.11) and 8.68 (±1.21), respectively. The HbA1c (average range of HbA1c 6.5% to 10.7%) increased significantly while following five years by 2.9% (p < 0.001). The prevalence of overweight and obese teens was increasing from the 1st year to the following five years later. In contrast, the underweight and healthy subjects were decreasing for the same subsequent years. Means of HbA1c were significantly higher among overweight and obese categories throughout following years. All lipid profile revealed significant increase during five years follow-up study. The prevalence of risk TC/HDL ratio (< 4.1) gradually raised in the last year follow-up by 52.1% comparing to the baseline risk ratio (0.8%). The study of TC/HDL ratio with BMI categories revealed that average T1D patients had an ideal ratio (n = 97) in the 1st year measurement. After five years follow-up study, the frequency of ideal ratio declined among all categories in the same rate. Risk TC/HDL ratio in the last year of the study showed that average group had more risk ratio measurements (n = 47) in contrast to the 1st year measurement (n = 1). The significant positive correlations were reported between HbA1c and DLP as shown in figure (r2 = 0.85). HbA1c and BMI percentile analyses during long follow-up years werevery highly significant differences (p < 0.0001) between the categories BMI in each year and from one year to another. Conclusion: Attention must be given to control DLP and other comorbidities among T1D adolescents to decrease diabetes macrovascular and microvascular complications.
基金National Natural Science Foundation of China(51832007,51872286)National Key Research and Development Program of China(2022YFB3605704)+4 种基金NSFC-Joint Funds for Regional Innovation and Development(U21A20508)Science and Technology Plan Leading Project of Fujian Province(2022H0043,2020H0036)Fujian Science&Technology Innovation Laboratory for Optoelectronic Information of China(2021ZR204,2020zz108)The 14th Five-year Plan Project of FJIRSM(E255KL0101)Science and Technology Service Network Initiative(2019T3006)。
基金Projects(52001152, 51961021) supported by the National Natural Science Foundation of ChinaProjects(DC2020353, DC2020342, DC2022017, DC2022025, DC2022027) supported by the Undergraduate Innovation and Entrepreneurship Training Programs,China。
