萃淋树脂伯胺N1923对钯（Ⅱ）的萃取吸附机理（Ⅱ）

研究了伯胺Ｎ_（１９２３）萃淋树脂在Ｎ_（１９２３）成盐及不成盐时吸附钯的反应机理，通过等摩尔系列法、斜率法、红外光谱及核磁共振谱法对吸萃物的组成及吸萃机理进行了探讨。     

伯胺N1923萃淋树脂吸萃钯的研究

伯胺Ｎ_（１９２３）萃淋树脂吸萃钯的研究程德平，夏式均（杭州大学化学系杭州３１０００８）关键词钯，萃淋树脂，吸附伯胺萃取剂Ｎ（１９２３）用以萃取金属离子有不少研究［１－３］，但以Ｎ（１９２３）萃淋树脂作固定相的萃取色层研究未见报道。本文研究了此树脂在?..     

异丙基膦酸单(1-己基-4-乙基)辛酯萃淋树脂吸萃重稀土元素(Ⅲ)

本文研究了异丙基膦酸单（１－己基－４－乙基）辛酯萃淋树脂在盐酸介质中对重稀土元素（Ⅲ）的吸萃平衡，考察了平衡水相酸度对吸附反应的影响，计算了重稀土（Ⅲ）间的平均分离系数，确定了吸附反应的Ｆｒｅｕｄｌｉｃｈ等温吸附方程。该树脂吸附Ｙｂ（Ⅲ）的静态饱和容量为６６．５ｍｇＹｂ／（ｇ．Ｒ），饱和萃合物的ＩＲ谱表明ＰＴ－２萃淋树脂吸附Ｙｂ（Ⅲ）的反应为阳离子交换反应。     

N_（1923）萃淋树脂对钯吸萃性能及机理的研究

Ｎ＿（１９２３）萃淋树脂是胺类萃淋树脂。本文报道了该树脂在酸性体系中对钯的静态分配比。讨论了温度、树脂用量，振摇时间对吸附钯的影响。确定了吸萃物的组成比，并用红外光谱探讨了树脂吸附钯的机理。在此基础上，进行树脂的柱色层试验，结果表明此树脂为萃取色层的新固定相，树脂上吸附的钯可用０．０５０ｍｏｌ／Ｌ硫脲－０．５０ｍｏｌ／ＬＨＣｌ溶液解脱，树脂可再生和重复使用。     

异丙基膦酸单（1—己基—4—乙基—辛酯萃淋树脂吸萃重烯土元素（Ⅲ）

本文研究了异丙基膦酸单辛酯萃淋树脂在盐酸介质中对重烯土元素的吸萃平衡，考察了平衡水相酸度对吸附反应的影响，计算了重稀土间的平均分离系数，确定了吸收反应的Ｆｒｅｕｄｌｉｃｈ等温吸附方程。该树脂吸附Ｙｂ的静态饱和容量为６６．５ｍｇＹｎｂ／（ｇ．Ｒ），饱和萃合物的ＩＲ谱表明ＰＴ－２萃淋树脂吸附Ｙｂ的反应为阳离子交换反应。     

仲碳伯胺萃淋树脂吸萃金的性能及机理

研究了仲碳伯胺（Ｎ１９２３）萃淋树脂吸萃金的机理，溶液酸效应、吸附等温线、吸附速率、盐析剂效应及柱操作条件的影响等，将该树脂用于矿样中金含量的测定，结果与７１７＾＃离子交换树脂吸附法一致，取得了较好的结果。     

N503萃淋树脂吸萃钯的性能及机理研究

研究了Ｎ５０３萃淋树脂吸萃钯的机理、溶液的酸效应、吸附等温线、吸附速率等，并用红外光谱、核磁共振等方法对树脂的吸附机理进行了探讨。     

N1923萃淋树脂对钯吸萃取性及机理的研究

Ｎ１９２３萃淋树脂是胺类萃淋树脂。本文报道了该树脂在酸性体系中对钯的静态分配比。讨论了温度、树脂用量，振摇时间对吸附钯的影响。     

二丁基卡必醇萃淋树脂吸萃金的性能及其机理的研究

研究了二丁基卡必醇（ＤＢＣ）萃淋树脂吸萃金的机理，溶液酸效应、吸附等温线、吸附速炫、盐析剂应柱操作条件等，将该树脂用于矿样中金含是珠测定，结果与７１７离子交换树脂吸附法一致。     

CL-P204萃淋树脂吸萃镓的性能和机理

本文采用静态法研究了CL-P204萃淋巴脂在硫酸介质中吸萃镓的性能。结果表明，在pH2.8时，镓在树脂上的分配系数最大，其吸附反应的热效应为43.2KJ/mol，树脂对镓的饱和吸附容量为42.4mg/g；吸萃过程为离子交换过程。     

果胶对钯的吸附及其在有机合成中的应用

以果胶为吸附剂,研究其对钯(Ⅱ)的吸附性能,探讨了溶液的pH值、吸附温度、果胶用量、吸附时间及钯(Ⅱ)溶液的初始浓度对吸附量的影响。 采用Pseudo-First-order、Pseudo-Second-order、Intraparticle、Diffusion、Langmuir、Freundlich和Temkin等模型对实验数据进行线性拟合。 结果表明,果胶对钯(Ⅱ)有很强的吸附性能,吸附率高达96%以上,溶液的最佳pH值为6.5,最佳温度为50 ℃,果胶对钯的吸附量随果胶用量的增加而降低,随钯溶液初始浓度的增加而增加。 吸附动力学遵从Pseudo-Second-order模型,即以化学吸附为主;等温吸附过程符合Freundlich方程;吉布斯自由能为负值,焓变和熵变分别为3.23 kJ/mol和13.32 J/(mol·K),即该过程是自发吸热的;果胶吸附的钯作为催化剂应用到Suzuki反应中,结果表明该催化剂有较高的催化活性。     

Adsorption of Carbon Monoxide on Palladium Electrode from Alkaline Solutions

Abstract

The adsorption of carbon monoxide from basic solution (0.1 M LiOH) on a palladium electrode was investigated. It was found that adsorption of CO takes place below the potential -0.25 V (vs. SCE). Surface concentration of the adsorption products, their composition and structure depend on the adsorption potential. The CO adsorption products block hydrogen absorption in palladium but in contrary to acidic solutions don't block the hydrogen desorption process.     

Separation of trace amounts palladium by SiO2/TiO2/Ce nanoparticles prior to flame atomic absorption spectrometry determination in anodic slime and wastewater samples

In the present work, a new SiO₂/TiO₂/Ce, nanoparticle was synthesed using sol-gel method and evaluated as an adsorbent for preconcentration trace amounts of Pd(II) ions. The characterization of the nanoparticles has been studied by transmission electron microscope and X-ray diffraction. The preconcentration method is based on palladium adsorption onto the surface of nanoparticle at pH 8.5. The main factors affecting Pd(II) adsorption, such as pH of sample solution, concentration and volume of eluent, sample volume, interfering of the coexisting ions and flow rate of sample and eluent were investigated and optimized. At optimum conditions, linearity was maintained between 4.0 to 1000.0 ng mL^?1. Detection limit based on 3S_b/m was 2.3 ng mL^?1. Seven replicate determinations of a solution containing of 12.5 µg palladium gave a relative standard deviation ±1.7%. According to the Langmuir linear model, the maximum adsorption capacity of palladium was found to be 34.5 mg g^?1. Finally, the feasibility of the proposed method for Pd(II) determination was assessed by analysis of certified reference materials, anodic slime and wastewater samples and satisfactory results were obtained.      

Determination of Palladium by Graphite Furnace Atomic Absorption Spectrometry After Preconcentration with MCI GEL CHP 20P Resin as Sorbent

A solid phase extraction and graphite furnace atomic absorption spectrometry for the determination of palladium with MCI GEL CHP 20P resin as sorbent was studied. Trace amounts of palladium was reacted with 2-ethylhexyl octyl sulfide followed by adsorption onto MCI GEL CHP 20P solid phase extraction column, and ethanol was used as eluent. The enrichment factor of this method for palladium was reached at 250. The detection limit in the original sample for palladium was found to be 0.0048 ng mL^?1. The proposed method has been successfully applied to the determination of trace amounts of palladium in different samples.     

On-line determination of trace levels of palladium by flame atomic absorption spectrometry

A preconcentration method is developed for the on-line determination of palladium in complex matrices with flame atomic absorption spectrometry (FAAS). The flow system comprised of a minicolumn filled with polyamine Metalfix-Chelamine resin which is highly selective for Pt(IV), Au(III) and Pd(II). Best preconcentration conditions are established by testing different resin quantities, sample and eluent solution volumes, and adsorption and elution steps flow rates. Sample volumes of 4.7 ml of palladium solutions resulted in an enrichment factor of twenty at the optimum hydrodynamic conditions. This value can be increased by injecting larger volumes of sample solution. The method is sensitive, easy to operate and permitted the determination of sub-mg l⁻¹ levels of palladium with a detection limit of 0.009 mg l⁻¹. The resin was used up to 60 times in consecutive retention-elution cycles without any appreciable deterioration in its performance. The applicability of this method was tested by determining the palladium content in synthetic geological samples as well as in the pellet-type used car catalyst reference material.     

二苄基硫醚树脂对钯的固相萃取吸附性能研究

基于二苄基硫醚树脂与钯的络合反应,建立了一种高选择性固相萃取吸附钯的方法。在0.1~6.0 mol/L的HCl介质中,钯可以被二苄基硫醚树脂吸附富集并形成1∶2稳定络合物,该络合物可用20 g/L酸性硫脲溶液洗脱,洗脱液经处理后用分光光度法测定,树脂结构不被破坏且可重新处理使用。方法用于吸附分离钯,回收率达90%以上。     

Separation of platinum and palladium with silicone-rubber foam treated with dimethylglyoxime

Open-pore silicone-rubber foam is shown to be a good inert solid support for column separations. Foams treated with dimethylglyoxime were studied for their adsorption of platinum and palladium from solution. The separation of platinum and palladium was achieved in solutions containing as little as 1.0 ppm.     

新型固化单宁树脂的合成及其对痕量钯(Ⅱ)的吸附性能研究

报道了新型固化单宁树脂的合成方法及其对钯(Ⅱ)分离富集的研究.探讨了溶液pH值、温度、洗脱条件及干扰离子等对钯(Ⅱ)分离富集的影响.在pH＝3,温度为25℃的条件下恒温水浴振荡20 min,痕量钯(Ⅱ)可被固化单宁树脂定量富集,其静态饱和吸附容量为44.91 mg·g-1.吸附的钯(Ⅱ)可用0.2 mol·L-1硫脲与0.2 mol·L-1盐酸混合液(体积比为1∶1)完全洗脱, 用火焰原子吸收光谱法(FAAS)测定.该法对钯(Ⅱ)的检出限(3σ,n=11)为0.091 μg·mL-1,相对标准偏差为2.69%(n=7),线性范围为0.16～8.2 μg·mL-1,加标回收率在97%～100%之间.方法用于催化剂中钯(Ⅱ)的测定,结果满意.     

TBA浸渍树脂对钯的吸附性能及应用

研究了三苄胺浸渍树脂吸附钯的机理、溶液酸效应、吸附等温线、吸附容量1吸附速率及操作条件等，用于测定钯催化剂中微量钯，取得了较好的效果。     

钯、铱单取代十二钼磷酸盐的制备及性质的研究

本文报道了Pd 、Ir 　取代的十二钼磷酸四丁基铵盐 (α (n Bu4 N) 5[PMo11Pd(OH2 )O39]、α (n Bu4 N) 3[PMo11Ir(OH2 )O39])的制备方法。IR、UV及31P NMR证实产物仍保持Keggin结构 ,并有一个Mo 为Pd 、Ir 所取代。电化学上 ,Ir 取代化合物存在三个清晰的多酸骨架氧化 还原峰而Pd 取代化合物由于电极吸附作用使它的氧化 还原峰无法被观察到。在两个取代化合物的烯烃催化氧化中醇、酮为主要产物。　值得注意的是 ,Pd 取代化合物催化的反应中苯酚取代环己烯酮而成为主要产物