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111.
高砷低金银的铅阳极泥中银的冶炼 总被引:3,自引:0,他引:3
本文报导了将纯碱加入砷含量高的铅阳极泥熔炼成贵铅,用硝酸溶解,硫氰酸盐沉淀,再用锌粉还原得银的方法。从而避免砒霜挥发。 相似文献
112.
《Electroanalysis》2003,15(14):1204-1211
Two types of glassy carbon (GC) powder (i.e., Sigradur K and Sigradur G) have been mixed with mineral oil to obtain glassy carbon paste electrodes (GCPE's). The electrochemical behavior of such electrodes at different percentages of glassy carbon has been evaluated with respect to the electrochemistry of ferricyanide as revealed with cyclic voltammetry and the best paste composition was chosen. GC was then modified with Prussian Blue (PB), mixed at different percentages with unmodified GC and with a fixed amount of mineral oil in order to obtain PB modified glassy carbon paste electrodes (PB‐GCPE's). PB‐GCPE's with different percentages of GC modified with PB (PB‐GC) were compared and the dependence on the amount of PB on their performances was evaluated by studying the parameters of cyclic voltammetry (i.e., current peak, ΔEp, anodic and cathodic current ratio, charge density) and the amperometric response to H2O2. Data interpretation based on the GC surface area is presented. GCPE's with a selected amount of PB‐GC were then tested as H2O2 probes and all the analytical parameters together with the dependence on pH were evaluated. Some preliminary experiments with these electrodes assembled as glucose, lysine and lactate biosensors are also reported. 相似文献
113.
Silica sol-gel films were prepared by dipping, starting from an acid catalyzed solution of methyltriethoxysilane (MTES) and tetraethoxysilane (TEOS). Silver metal nanoparticles were produced in the silica layer by introducing in the sol-gel precursor solution AgNO3 or AgClO4·H2O. The silver ions were thermally reduced in air at 800°C, giving an intense yellow coating film. The silver metal particles were observed by transmission electron microscopy and X-ray diffraction. The diameter of the silver particles was found to be about 10 nm. Absorption measurements in the UV-Vis were used to evaluate the volume fraction of silver colloids embedded in the silica layer. 相似文献
114.
E. P. Grishina T. V. Vladimirova L. M. Ramenskaya K. S. Shilovskii 《Russian Journal of Electrochemistry》2007,43(2):234-237
Electrochemical oxidation of silver in the 1-butyl-3-methylimidazolium bromide ([BMIm]Br) ionic liquid is studied by cyclic voltammetry, chronopotentiometry, chronoammetry, and gravimetry. Two electrode processes irreversibly proceed on the silver electrode in the potential range studied: the formation of compound [BMIm]+[AgBr2]?, which is soluble in [BMIm]Br, and difficultly soluble AgBr. 相似文献
115.
The selective solvation of silver(I) iodate was studied in methanoldimethyl sulohoxide mixtures at 30° C by solubility and
EMF measurements. The solubility of the salt increases continuously with the addition of dimethyl sulphoxide after a slight
decrease into XDMSO =0.1. The Gibbs energy of transfer of silver cation (determined on the basis of ferrocene reference method) decreases continuously
while that of the iodate ion increases with the addition of dimethyl sulphoxide. The solvent transport number passes through
a maximum (Δ = 2.0) around XDMSO
= 0.5. These results were interpreted as arising due to a heteroselective solvation of the salt, the silver ions being preferentially
solvated by dimethyl sulphoxide and the iodate ion by methanol in these mixtures. 相似文献
116.
The preconcentration and voltammetric behavior of BiIII on a sodium humate modified carbon paste electrode was studied by means of cyclic voltammetry (CV) and differential pulse stripping voltammetry (DPSV). The proposed measurement involves an initial nonelectrolytic preconcentration step in which BiIII is complexed by the surface modifier in a solution of 0.05 M KNO3-0.0106 M HNO3 (pH 2.0) and a subsequent electrochemical scan step in which the preconcentrated BiIII was reduced and then oxidized promptly in supporting electrolyte of 0.5 M HNO3. The resulting DPSV anodic current was proportional to the concentration of BiIII ion over the range of 4.78 × 10−8–1.44 × 10−5 M. The detection limit was 4.78 × 10−8 M. The proposed method was used to determine bismuth in various samples. Various factors affecting the electrode behavior were also investigated at the same time. 相似文献
117.
We studied the Y–Ba–Cu–O/Ag equilibrium diagram in oxygen atmosphere around the composition YBa2Cu3Ox/Ag35 mass%. We found a high thermal effect: the peritectic decomposition temperature of Y-123 phase is lowered from 1040
to 940°C. We demonstrate here that the nature of the phenomenon is not chemical. We explained it as the result of a mechanical
segregation of Y-123 decomposition products from Y-123 phase, performed by silver.
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献
118.
Shape-controlled synthesis of metal nanostructures: the case of silver 总被引:19,自引:0,他引:19
The concept of shape-controlled synthesis is discussed by investigating the growth mechanisms for silver nanocubes, nanowires, and nanospheres produced through a polymer-mediated polyol process. Experimental parameters, such as the concentration of AgNO(3) (the precursor to silver), the molar ratio between poly(vinylpyrrolidone) (PVP, the capping agent) and AgNO(3), and the strength of chemical interaction between PVP and various crystallographic planes of silver, were found to determine the crystallinity of seeds (e.g., single crystal versus decahedral multiply twinned particles). In turn, the crystallinity of a seed and the extent of the PVP coverage on the seed were both instrumental in controlling the morphology of final product. The ability to generate silver nanostructures with well-defined morphologies provides a great opportunity to experimentally and systematically study the relationship between their properties and geometric shapes. 相似文献
119.
用超高真空程序升温反应谱和瞬时应答方法研究了乙二醇在电解银表面的氧化,实验表明,室温下乙二醇吸附在电解银表面,并在343K分解给出一组产物群,预吸附氧与乙二醇反应时,在343K,433K和612K处给出三组产物群,它们分别对应于不同的表面反应,并给出了电解银催化乙二醇制乙二醛的活性结果。 相似文献
120.
G.A.E. Mostafa 《Talanta》2007,71(4):1449-1454
The construction and general performance characteristics of two novel potentiometric carbon paste electrodes (CPE) responsive to antimony are described. These sensors are based on the use of the ion associate complexes of tetraiodoantimonate (TIA) anion with cetylpyridinium (CP) and triphenyl tetrazolium (TPT) counter cations as ion exchange site in a carbon paste matrix. The two sensors exhibits fast, stable and near-Nernstian for the mono charged TIA anion over the concentration range 1 × 10−3 to 10−6 M at 25 °C in the pH range 4-10 with anionic slope of 58.0 ± 0.5 and 55.0 ± 0.7 per concentration decade for TIA-CP and TIA-TPT, respectively. The lower detection limits are 4 and 5 × 10−6 M and response time are 20 and 30 s in the same order of both electrodes. Selectivity coefficients for antimony relative to a number of different cations and anions were investigated. There is negligible interference from many inorganic cation and anion except for Hg2+, Cd2+, and Bi3+; however, their effect were eliminated by EDTA. The determination of 1.0-120.0 μg/ml of antimony in aqueous solutions shows an average recovery of 99.0 and 97.5% with relative standard deviation of 2.0% for both electrodes at 40 μg/ml. The determination of antimony in wastewater and some antibilharzial compounds using the proposed electrodes gave results that compare favorably with those obtained by the atomic absorption spectrometric method. Precipitation titrations involving cetylpyridinium chloride as titrant are monitored with both electrodes with inflection point of 180 and 100 mV for TIA-CP and TIA-TPT, respectively. 相似文献