The Fe3＋/Fe2＋ redox electrolyte for use in polyaniline/tin oxide （PANI/SnO2）supercapacitors was reported. The influences of redox electrolyte based on different Fe3＋/Fe2＋ ion pair concentrations in 1 mol/LH2SO4 solution on the pseudocapacitive behaviors of PANI/SnO2 supercapacitor were investigated. The electrochemical properties of the supercapacitor were studied by cyclic voltammetry （CV）, galvanostatic charge discharge （GCD）, and electrochemical impedance spectroscopy （EIS） techniques. It is found that the performance of the supercapacitor is the best when the Fe3＋/Fe2＋ concentrationis 0.4 mol/L and its initial specific capacitance is 1172 F/g at an applied current density of 1 A/g. The long-term cycling experiment shows good stability with the retention of initial capacitance values of 88% after 2000 galvanostatic cycles. The experimental results testify that using Fe3＋/Fe2＋ redox electrolyte has a good prospect for improving the performances of energy-storage devices.
A new method for synthesizing eltoprazine is presented in this article.3-nitrobenzene-1,2-diol is synthesized with pyrocatechol via a nitrating reaction,and then we use 1,2-dibromoethane as the cycling agent to prepare 5-nitro-2,3-dihydrobenzo[b]dioxine.5-amino-2,3-dihydrobenzo[b]dioxine is synthesized with 5-nitro-2,3-dihydrobenzo[b]dioxine via a reductive reaction in ethanol using hydrazine hydrate as reductive agent and Pd/C as catalyst.The object product eltoprazine is then prepared by a cycling reaction using bis(2-chloroethyl)ammonium chloride.This method could be easy to operate in laboratory and get a high yield.
该文制备了一种新型吸附材料三乙烯四胺修饰β-环糊精交联树脂（TETA-β-CDP）,并对其进行红外光谱表征,优化了该吸附材料对痕量铅、镉的吸附和解析条件,建立了动态条件下同时分离富集/原子吸收光谱测定大米中铅和镉的新方法。在p H 5.5时,样品溶液以1.0 m L/min流速过柱,试液中的Pb2＋和Cd2＋可被该树脂定量富集,其动态饱和吸附容量分别为22.8,31.3 mg/g,吸附在TETA-β-CDP上的Pb2＋和Cd2＋可用0.1 mol/L HCl以0.8 m L/min流速完全洗脱。该方法对铅、镉的检出限（3σ,n=11）分别为0.038 mg/L和0.016 mg/L;线性范围分别为0.2~20 mg/L和0.05~2.5 mg/L;相对标准偏差（RSD）分别为2.8%和1.7%;加标回收率分别为97.5%~101.0%和95.0%~102.5%。该方法用于大米样品中痕量铅、镉的测定,结果满意。
