新型超铁(Ⅵ)电池正极材料的制备及性能研究

研究了高铁酸钾和高铁酸钡在7 mol·L-1KOH溶液中的溶解度和稳定性,发现随着温度升高,高铁酸盐溶解度逐渐增大,稳定性迅速下降;并用红外光谱(IR)、X射线衍射(XRD)和扫描电镜(SEM)对其结构进行了测试,发现所合成的高铁酸盐具有空间群为D2h(Pnma)的正交晶系结构,由粒径为50～165 nm的纳米-亚微米级粒子组成.用两种高铁酸盐材料制备Zn-超铁电池,放电试验结果表明Zn-BaFeO4电池比Zn-K2FeO4电池放电电位平台高170～220 mV,放电容量高一倍.     

粘土对高铁酸盐溶液的稳定作用研究

高铁酸盐是一种氧化能力很强的氧化剂，可用于有机物的选择氧化、污水处理、杀菌消毒和环保型电池材料等方面。本文研究粘土对高铁酸盐溶液稳定性的影响，测定不同酸碱条件下粘土浸出液中的硅含量，对粘土稳定高铁酸盐的原因进行分析。以期找到高铁酸盐溶液的廉价稳定剂。     

新型超铁（VI）电池正极材料的制备及性能研究

研究了高铁酸钾和高铁酸钡在7 mol•L－1 KOH溶液中的溶解度和稳定性，发现随着温度升高，高铁酸盐溶解度逐渐增大，稳定性迅速下降；并用红外光谱（IR）、X射线衍射（XRD）和扫描电镜（SEM）对其结构进行了测试，发现所合成的高铁酸盐具有空间群为D2h（Pnma）的正交晶系结构，由粒径为50～165 nm的纳米-亚微米级粒子组成.用两种高铁酸盐材料制备Zn-超铁电池，放电试验结果表明Zn-BaFeO4电池比Zn-K2FeO4电池放电电位平台高170～220 mV，放电容量高一倍.     

氟离子配位在氧化法制备高铁(Ⅵ)酸盐中的作用

氟离子配位在氧化法制备高铁(Ⅵ)酸盐中的作用;高铁(Ⅵ)酸盐;六氟合铁(Ⅲ)酸钾;次氯酸钠;稳定性     

高铁酸盐的电化学合成及对活性污泥的处理进展

活性污泥(WAS)产量的不断增加已经成为污水厂普遍存在的难题。高铁酸盐具有氧化、消毒、絮凝、吸附等作用,在污泥处理中具有良好的应用前景。同时,高铁酸盐在常温下具有不稳定性,极易分解,需要在线生产的技术。本文从高铁酸盐的性质出发,综述了高铁酸盐的电化学合成方法及其影响因素,并对其在线生产高铁酸盐的应用进展进行介绍;总结了高铁酸盐对于活性污泥处理中的污泥脱水、最小化和厌氧发酵等三个方面的处理机理和影响。最后,提出了对于未来发展方向的认识,以期提高处理效率、节约成本。     

电解制备高铁酸盐中负脉冲作用和高铁酸盐对十二烷基苯磺酸钠的降解

电解制备高铁酸盐中负脉冲作用和高铁酸盐对十二烷基苯磺酸钠的降解;高铁酸盐;电解;脉冲方波;十二烷基苯磺酸钠     

高铁电池用负极材料的可行性分析

结合高铁酸盐的物理化学性质，确定了高铁电池可用的电解液类型。根据高铁酸盐正极材料的电化学性质，分析了高铁电池负极材料的种类和组成高铁电池的可行性，并讨论了不同负极材料的高铁电池的性质、应用前景和开发重点，以推动高铁电池的发展。     

活性白土负载高铁酸钠的稳定化性能的研究

高效水处理剂[1]高铁酸盐水溶液不稳定。目前,解决的方法一是在高铁酸盐的碱性水溶液中加入Na2SiO3·5H2O、Mo(IO4)3、CuCl2、KI等复合稳定剂[2],另一种方法是利用吸附剂负载高铁酸盐[3]。我们尝试了用不同吸附剂负载不含次氯酸钠的高铁酸钠,并对其稳定性规律进行了初步探讨,制得了携带安全方便的负载型高铁酸钠,有望用于野外饮用水的消毒与杀菌。1　实验部分吸附剂的预处理　人造浮石、纯高岭土、纯活性白土于1000℃下灼烧2h备用。活性白土、高岭土以及活化助剂按一定比例混和调湿,制粒,干燥,于1000℃下,通入空气灼烧3h备用,记为…     

高铁酸盐:一种绿色的多功能水处理剂

多种新型污染物和微生物污染等问题的出现,导致地表水水质复杂多变,传统的水处理药剂和处理方式已无法满足人们对饮用水处理的需求。 高铁酸盐作为一种新型水处理试剂,同时具备优良的氧化性和混凝性,而且不会引起二次污染,是一种可大力开发的绿色试剂。 本文综述了高铁酸盐净水剂的制备与表征分析方法,及其用于水处理对重金属、新型污染物和微生物等去除的作用机制。 目前,有关高铁酸盐用于有机污染物去除的混凝和氧化去除协同作用的研究尚不多见,高铁酸盐的氧化-混凝协同特性尚未被充分开发。 本文以此为重点进行了讨论,并对高铁酸盐净水剂的应用进行了展望。     

高铁酸盐研究进展

综述了近年来国内外关于高铁酸盐研究的最新进展,重点就高铁酸盐的制备、分析、应用等方面进行了概述。参考文献37篇。     

不同量Fe（Ⅲ）与ClO^-热碱溶液化学反应的跟踪观察

取不同量的Fe（Ⅲ）分别与高碱度NaClO溶液共热到80℃反应，采用分光光度法依次跟踪各反应体系，发现Fe（Ⅲ）首先被氧化为Fe（Ⅵ）紫色溶液，接着Fe（Ⅵ）快速分解生成Fe（OH）3沉淀，同时体系中还存在着Fe（Ⅵ）氧化Fe（Ⅲ）生成Fe（Ⅳ）的反应．绿色的Fe（Ⅳ）溶液更稳定，且Fe（Ⅳ）的生成浓度随Fe（Ⅲ）加入量的递增而升高．     

光照对高铁酸盐溶液稳定性的影响

The effects of light wave on the stability of fen'ate solution have been examined. The results showed that UV-light accelerates the decomposition of ferrate with decomposition rate 1.6 times as much as that in dark whereas infrared light has only unclear effect on the stability of ferrate, with decomposition rate 1.1 times as much as in dark. The polythene container is found to the best for preservation of ferrate solution in dark.     

Synthesis of Graphene Oxide by Oxidation of Graphite with Ferrate(VI) Compounds: Myth or Reality?

It is well established that graphene oxide can be prepared by the oxidation of graphite using permanganate or chlorate in an acidic environment. Recently, however, the synthesis of graphene oxide using potassium ferrate(VI) ions has been reported. Herein, we critically replicate and evaluate this new ferrate(VI) oxidation method. In addition, we test the use of potassium ferrate(VI) for the synthesis of graphene oxide under various experimental routes. The synthesized materials are analyzed by a number of analytical methods in order to confirm or disprove the possibility of synthesizing graphene oxide by the ferrate(VI) oxidation route. Our results confirm the unsuitability of using ferrate(VI) for the oxidation of graphite on graphene oxide because of its high instability in an acidic environment and low oxidation power in neutral and alkaline environments.     

Preliminary investigation on the physicochemical properties of calcium ferrate(VI)

Calcium ferrate(VI) powders were synthesized from potassium ferrate(VI), and characterized by titration analysis, elemental analyzer, SEM, XRD, IR, TG and DSC. The results showed that the synthesized sample mainly consists of calcium ferrate(VI), and calcium ferrate(VI) may exist as CaFeO₄ · 2H₂O with a highest obtained purity of 74.9%. The relatively higher Fe(III) impurity and crystalloid water might be responsible for the poor stability of the calcium ferrate(VI) sample. The results of galvanostatic discharge experiments indicated that the calcium ferrate (VI) sample displays better intrinsic rate discharge capability and larger discharge capacity at lower temperatures (⩽15 °C).     

Dry Chemistry of Ferrate(VI): A Solvent‐Free Mechanochemical Way for Versatile Green Oxidation

The +6 oxidation state of iron generally exists in the form of ferrate(VI) with high redox potential and environmentally friendly nature. Although ferrate(VI) has been known for over a century, its chemistry is still limited to the solvent‐based reactions that suffers from the insolubility/instability of this oxidant and the environmental issues caused by hazardous solvents. Herein, we explore the solvent‐free reactivity of ferrate(VI) under mechanical milling, revealing that its strong oxidizing power is accessible in the “dry” solid state towards a broad variety of substrates, for example, aromatic alcohols/aldehydes and carbon nanotubes. More significantly, solvent‐free mechanochemistry also reshapes the oxidizing ability of ferrate(VI) due to the underlying solvent‐free effect and the promotive mechanical actions. This study opens up a new chemistry of ferrate(VI) with promising application in green oxidative transformation of both organic and inorganic substrates.     

高阳极电势窗口的SnO_2-Sb_2O_3/Ti电极的制备

制备了不同热处理温度和涂层次数的SnO2-Sb2O3/Ti电极,研究了不同电极涂层的氧化物组成,涂层表面形貌和阳极电势窗口及其三者的内在关系,考察了不同制备工艺条件的电极对电催化高铁性能的影响.结果表明430℃是电极最佳的热处理温度,涂层次数增加为30次时,电极具有高的阳极电势窗口,同时能降低高铁氧化还原反应的超电势,更真实的展现高铁电化学生成的热力学原貌.     

A theoretical study of alcohol oxidation by ferrate

The conversion of methanol to formaldehyde mediated by ferrate (FeO(4)2-), monoprotonated ferrate (HFeO4-), and diprotonated ferrate (H2FeO4) is discussed with the hybrid B3LYP density functional theory (DFT) method. Diprotonated ferrate is the best mediator for the activation of the O-H and C-H bonds of methanol via two entrance reaction channels: (1) an addition-elimination mechanism that involves coordination of methanol to diprotonated ferrate; (2) a direct abstraction mechanism that involves H atom abstraction from the O-H or C-H bond of methanol. Within the framework of the polarizable continuum model (PCM), the energetic profiles of these reaction mechanisms in aqueous solution are calculated and investigated. In the addition-elimination mechanism, the O-H and C-H bonds of ligating methanol are cleaved by an oxo or hydroxo ligand, and therefore the way to the formation of formaldehyde is branched into four reaction pathways. The most favorable reaction pathway in the addition-elimination mechanism is initiated by an O-H cleavage via a four-centered transition state that leads to intermediate containing an Fe-O bond, followed by a C-H cleavage via a five-centered transition state to lead to formaldehyde complex. In the direct abstraction mechanism, the oxidation reaction can be initiated by a direct H atom abstraction from either the O-H or C-H bond, and it is branched into three pathways for the formation of formaldehyde. The most favorable reaction pathway in the direct abstraction mechanism is initiated by C-H activation that leads to organometallic intermediate containing an Fe-C bond, followed by a concerted H atom transfer from the OH group of methanol to an oxo ligand of ferrate. The first steps in both mechanisms are all competitive in energy, but due to the significant energetical stability of the organometallic intermediate, the most likely initial reaction in methanol oxidation by ferrate is the direct C-H bond cleavage.     

高铁酸钾的制备及其在废水治理中的应用进展

高铁酸钾是一种集氧化、絮凝、吸附、杀菌、消毒、除臭功能于一体的新型绿色高效水处理药剂,在废水处理领域具有重要的理论研究和实际应用价值。本文对近年来高铁酸钾的制备方法及其在废水治理中的应用进行综述,重点分析了各制备方法的优缺点,并结合当前最新研究成果对高铁酸钾的工业制备及在废水治理中的应用前景进行了展望。