Studies on the Electrochemical Characteristics of K2FeO4 Electrode

Discharge performance of K2FeO4 electrode under different conditions was studied by the constant electric current discharge method. The electrochemical characteristics of K2FeO4 electrode were investigated for the first time by means of cyclic voltammetry. The results show that the K2FeO4 electrode made at moderate pressure (20MPa) and discharged at lower current has better discharge performance. It is also found that K2FeO4 electrode is significantly rechargeable.     

FeO(OH)@C-Catalyzed Selective Hydrazine Substitution of p-Nitro-Aryl Fluorides and their Application for the Synthesis of Phthalazinones

An efficient hydrazine substitution of p-nitro-aryl fluorides with hydrazine hydrates catalyzed by FeO(OH)@C nanoparticles is described. This hydrazine substitutions of p-nitro-aryl fluorides bearing electron-withdrawing groups proceeded efficiently with high yield and selectivity. Similarly, hydrogenations of p-nitro-aryl fluorides containing electron-donating groups also smoothly proceeded under mild conditions. Furthermore, with these prepared aryl hydrazines, some phthalazinones, interesting as potential structures for pharmaceuticals, have successfully been synthesized in high yields.     

Fe(Ⅳ)的合成及其稳定性研究

通过两种方法合成出Fe(Ⅳ)溶液,研究了Fe(Ⅳ)溶液的反应性、稳定性以及添加其他离子对Fe(Ⅳ)在水溶液中的稳定性的影响,并对Fe(Ⅵ)的反应历程进行了探讨。Fe(Ⅳ)离子的氧化性较Fe(Ⅵ)离子弱,可以氧化苯甲醇,而难以氧化间二甲苯;在Fe(Ⅳ)溶液中加入磷酸钠使其稳定性下降,而加入醋酸钠可显著提高Fe(Ⅳ)在溶液中的稳定性;Fe(Ⅳ)在溶液中的浓度越高越不稳定;随着碱浓度的增加Fe(Ⅳ)在溶液中的稳定性增强且在碱水溶液中Fe(Ⅳ)比Fe(Ⅵ)更稳定。     

Ca掺杂对EuFeO3的Fe离子的电子态的影响

利用固相反应合成了Eu_1-xCa_xFeO₃钙钛矿氧化物.XRD测量表明,在x≤0.6范围内为钙钛矿结构;室温下的⁵⁷FeMössbauer谱测试给出3个磁谱和1个顺磁双线谱;在3个磁谱中,1个为处于四配位的Fe离子,另外2个为处于八配位的Fe离子.XPS谱表明Fe_2p3/2的高结合能端出现与Fe离子配位状态相对应的肩峰.所有Fe离子都处于+3价态.     

亚铬酸盐滴定法测定高铁酸钾

以亚铬酸盐氧化还原反应为基础建立了K2FeO4的滴定分析方法.对滴定分析条件进行了进一步的研究,结果表明,用氢氧根离子浓度为 16～17 mol/L的亚铬酸盐溶液测定高铁时,所取高铁样品的质量影响所测的高铁含量.     

基于可见光-近红外光谱的BIF磁性率确定方法研究

铁矿中磁性率是评价铁矿床工业价值和划分矿石工业类型的重要指标。传统的磁性率测定法存在工作量大、效率低、周期长的缺陷,成为经济、合理、高效开采铁矿资源的瓶颈问题。采用便携式地物光谱测试仪对辽宁省鞍钢集团鞍千矿业有限责任公司的BIF实验样品进行可见光-近红外光谱测试,分析了光谱特征,构建了比值指数(RI)、差值指数(DI)和归一化指数(NDI),并确定光谱指数与样品磁性率相关性最显著的敏感波段及对应的相关系数值;优选出与样品磁性率相关性最显著的比值指数(RI),构建实验样品磁性率的定量反演模型,并进行了验证。结果表明,三种光谱指数与样品磁性率敏感波段均位于935与1 050 nm,且该波段处的相关系数均达到0.9以上,其中比值指数与样品磁性率的相关性最高;基于比值指数构建的实验样品磁性率定量反演模型的预测误差为0.038,反演磁性率与实测磁性率的判定系数(R2)为0.964 5,预测结果比较理想。为确定BIF的磁性率提供了一种新方法,该方法具有工作强度小、经济、高效、便捷的优点,且对遥感找矿具有一定指导意义。     

FeO+(6∑+)催化CO还原N2O的理论研究

在B3LYP/6-311+G(2d)//B3LYP/6-31C(d)计算水平下,考察了FeO+(6∑+)分子如何催化CO还原N2O微观机理.计算结果表明,FeO+(6∑+是一种有效的催化剂,其可从N2O中夺取一个O原子,然后再传递给CO,完成整个氧转移过程.结果发现,反应中可能生成各种过氧[Fe(O2)+]或双端氧(OFeO+)物种,其中前者比较稳定,后者更活泼.     

Multi‐responses optimization of simultaneous adsorption of methylene blue and malachite green dyes in binary aqueous system onto Ni:FeO(OH)‐NWs‐AC using experimental design: derivative spectrophotometry method

In this research, response surface methodology (RSM) approach using Central Composite Design (CCD) coupled by derivative spectrophotometry method was applied to develop mathematical model and optimize process parameters for simultaneous adsorption of methylene blue (MB) and malachite green (MG) from aqueous solution using Ni:FeO(OH) ‐ NWs‐AC. The optimal conditions to adsorption of MB and MG in binary mixture solution from aqueous solution were found at pH 8.0, MB concentration 20 mg L^‐1, MG concentration 20 mg L^‐1, adsorbent dosage 0.033 g and contact time 40 min. At these conditions, high adsorption efficiency (99.39% and 100.0% for MB and MG, respectively) was achieved. Among experimental equilibrium, Langmuir isotherm model fitted well with maximum monolayer adsorption capacity of 28.6 and 29.8 mg g^‐1 for MB and MG, respectively. The adsorption kinetic data followed pseudo second‐order kinetics for MB and MG dyes.     

电解条件对电化学法制备FeO42-的影响

以铁丝网作阳极,应用电解氧化法制备FeO42-溶液,并合成固体K2FeO4.研究电解条件(如搅拌、超声、静置、温度、电流密度等)对该制备过程电流效率的影响规律.结果表明:以14 mol/L NaOH作电解液,于30℃、10 mA.cm-2及搅拌作用下电解,可获得较高的电流效率.     

电解法制备K_2FeO_4过程添加剂的筛选

应用电解法,并于阳极电解液中分别加入KIO4等不同种类添加剂制备K2FeO4,考察添加剂对电流效率以及FeO42-稳定性的影响规律,产品K2FeO4的结构形貌由XRD、SEM表征.结果表明,KIO4是比较理想的添加剂,在阳极液中添加质量比为0.02%的KIO4,电解1h后,电流效率可提高31.6%,K2FeO4产品的纯度相应提高了3.85%.