模拟磷矿脱镁废水中镁离子的交换动力学研究

用动边界模型积分方程描述模拟磷矿脱镁废水中Mg2＋在001×7×7型树脂上的有限浴交换动力学,得到了动力学总方程.Mg2＋的交换过程属颗粒扩散控制,表观活化能为23.45 kJ•mol－1,Mg2＋的表观反应级数为0.68.     

Synthesis of Mesoporous Lanthanum Phosphate and Its Use as a Novel Sorbent

Mesoporous lanthanum phosphate was synthesized by supramolecular self-assembly of cetyltrimethylammo-nium bromide and lanthanum nitrate following digestion in phosphoric acid.TGA-DTA,XRD and SEM were em-ployed to study the uncalcined and calcined materials.Sorption behavior of Cr(Ⅲ),Mn(Ⅱ),Fe(Ⅲ),Co(Ⅱ),Ni(Ⅱ),Cu(Ⅱ),Zn(Ⅱ),Cd(Ⅱ),Ba(Ⅱ),Hg(Ⅱ)and Pb(Ⅱ)cations was studied on such materials in water,3 mol·L~(-1)ammonia,0.01 mol.L~(-1)potassium ferrocyanide and 0.01 mol·L~(-1)potassium ferricyanide solutions.     

Transparent and anhydrous proton conductors based on PVA/imidazole/NH4H2PO4 composites

A new anhydrous proton conducting membrane for solid-state electrochromic device (ECD) based on poly(vinyl alcohol) (PVA), imidazole (Imi), and ammonium dihydrogen phosphate (NH₄H₂PO₄) was prepared. The structure of PVA/Imi/NH₄H₂PO₄ composite membrane was studied by X-ray diffraction and differential scanning calorimetry (DSC). The transmittance of the membrane always decreases with increasing content of the imidazolium. Compared with the PVA/NH₄H₂PO₄ membrane, the addition of proper amount of Imi can enhance the proton conductivity to a certain extent. At low PVA content, equal molar ratio of Imi and NH₄H₂PO₄ is favorable for high proton conductivity, while higher molar ratio of Imi and NH₄H₂PO₄ is beneficial at high PVA content.     

在线电生锰(Ⅲ)流动注射化学发光法测定地塞米松磷酸钠

采用在线恒电流电解产生Mn(Ⅲ)与流动注射化学发光法相结合,基于地塞米松磷酸钠可使Mn*#-Na2SO3新体系化学发光大大加强的现象,建立了测定地塞米松磷酸钠的新分析方法.其线性范围为1×10-4～1×10-2 g/L;检出限为7×10-5 g/L;RSD为1.2%.该法成功地应用于针剂中地塞米松磷酸钠的测定.     

磷酸三丁酯—钛—钽试剂第三相的形成与应用

本文研究了强酸性介质中，磷酸三丁酯萃取体系（ＴＢＰ．ＨＡ）第三相的形成条件；探讨了ＴＢＰ．ＨＡ对钛的萃取行为；建立了ＨＣｌＯ４－Ｈ２ＳＯ４介质中，利用ＴＢＰ．ＨＡ第三相萃取，然后用ＩＣＰ－ＡＥＳ温室痕量钛的方法。结果表明，由于第三相体积小，对钛有较高的富集倍数，降低了分析的检出限，用ＩＣＰ－ＡＥＳ检测，可以消除基体及其他大部分元素对测定的干扰，测定钛的回收率在９７％－１０１％。利用本法对钢样标准物     

Intercalation of pyridine and quinoline intoα-zirconium phosphate

The uptake of pyridine and quinoline into-zirconium phosphate has been investigated by the batch method. The effect of solvent on the reactions was also studied. Pyridine was taken up from ethanol, chloroform, carbon tetrachloride, ethanol-water, and acetone-water solutions, but not from pure acetone at 25°C. Water accelerated the uptake of pyridine. These facts indicate that a water molecule was involved in the uptake reaction of pyridine.Quinoline was taken up easily in an ethanol-water solution at 25°C, and in an ethanol solution at the boiling point. Two reactions — ion exchange and intercalation — occur on taking up the quinoline. An IR spectrum of the quinoline form is reported.     

具有[3~4~48~4]笼状结构单元的微孔磷酸镓Ga_3P_2O_8(OH)_3(H_2O)的合成、晶体结构及表征

开放骨架结构金属磷酸盐不仅具有丰富的结构和组成多样性,而且在吸附、分离、和催化等方面具有潜在的应用前景[1￣3]。同磷酸铝一样[2,3],磷酸镓是开放骨架磷酸盐中一个重要的家族,其结构主要由交替的GaOn多面体(GaO4,GaO5及GaO6)和PO4四面体构成。目前,已有近百种磷酸镓在水热/溶剂热体系下成功的合成出来[4￣8],其中最著名的例子是具有二十员环超大孔磷酸镓Cloverite[5]。这些磷酸镓不仅具有结构上的新颖性,同时还具有丰富的组成计量比(Ga/P:1/2￣3/2)[9],它们的结构由多种次级结构单元(SBU)构成,拓扑相关性为定向设计提供了重要基…     

Sodium Chloride Molar Conductance in Different Poly(ethylene glycol)–Water Mixed Solvents

The molar conductivities of NaCl in several poly(ethylene glycol)(PEG)–water “mixed solvents” are presented as a function of the PEG content in solution. Three different PEG samples, a monodispersed one and two polydispersed ones, have been used. The comparison between the molar conductivity values in the mixed solvents and the corresponding ones in pure water shows that the only effect of PEG on the ions’ motions is an obstruction effect despite the variation of the macroscopic dielectric constant induced by PEG itself. A comparison between the molar conductivities and the corresponding mutual main diffusion coefficients shows a tight correlation between the two quantities. This correlation is possible only in the absence of electrostatic effects due to the presence of PEG.