CL-P204树脂对Gd和Tb的吸附性能研究

本文系统研究了接触时间,硝酸浓度,金属离子初始浓度等对CL-P204树脂吸附Gd^(3+)和Tb^(3+)的影响。结果表明,CL-P204树脂对Gd^(3+)、Tb^(3+)的吸附在10 min以内达到吸附平衡。在0.1~2 mol/L硝酸中,Gd^(3+)和Tb^(3+)的分配系数随着硝酸浓度的增加迅速下降;Gd^(3+)、Tb^(3+)的分配系数最高可达2.5×10^(4)g/mL、2.7×10^(5)g/mL。随着Gd^(3+)、Tb^(3+)的初始浓度的增加,Gd3、Tb^(3+)吸附容量逐渐增加,然后趋近平衡。CL-P204树脂对Gd^(3+)、Tb^(3+)的等温吸附较符合Langmuir模型,属于单分子层吸附。Gd^(3+)、Tb^(3+)的饱和吸附容量为34 mg/g、39 mg/g。

CL-P204萃淋树脂吸萃铟(Ⅲ)的离子交换动力学

为确定CL P2 0 4萃淋树脂 (内含二 ( 2 乙基己基 )磷酸萃取剂 )在硫酸介质内吸萃铟 (Ⅲ )过程中In3+ H+ 的离子交换动力学 ,以有限浴法考察了影响In3+ H+ 进行离子交换的三个因素 :温度、树脂的粒度和铟 (Ⅲ )离子的浓度。结果表明 ,在实验范围内 ,其交换速度随温度的升高、铟 (Ⅲ )离子浓度的增大和树脂粒度的减小而增大。根据Body理论模型可推知 :粒内扩散是CL P2 0 4萃淋树脂在硫酸介质中吸萃铟 (Ⅲ )过程中In3+ H+ 交换的主控步骤。求得了In3+ H+ 离子交换过程中铟 (Ⅲ )离子在树脂上扩散的有效扩散常数、表观扩散活化能和活化熵 ,分别为 1 5 7× 10 - 1 0 m2 ·s- 1 ,11 9kJ·mol- 1 ,-84 1J·(mol·K) - 1 。

Separation of indium(Ⅲ), gallium(Ⅲ), and zinc(Ⅱ) with Levextrel resin containing di(2-ethylhexyl) phosphoric acid (CL-P204): Part Ⅱ. Mechanism and kinetics of adsorbing indium(Ⅲ)

The mechanism of adsorbing indium(Ⅲ) from sulfate solutions with CL-P204Levextrel resin containing di(-2-ethylhexyl) phosphoric acid was examined by batch operation andinfrared spectra. The results showed that the P204 adsorbed on the resin behaved in the similar wayto solvent extraction except that it was as a monomer in resin adsorbing but in dimeric form insolvent extraction. Three factors including temperature, indium(Ⅲ) concentration of solution, andthe size of resin particles which influence the In^(3+)/H^+ exchange on CL-P204 Levextrel resin wereinvestigated by the modified limited batch technique in order to determine the kinetics ofIn^(3+)/H^+ exchange. It was found that the rate of ion exchange increased with the temperature andthe concentration of solution increasing and with the size of the resin particles decreasing.According to the expression developed by Boyd et al., the controlling factor of In^(3+)/H^+ exchangeon CL-P204 Levextrel resin was the diffusion through the resin particles. The effective diffusioncoefficient, activation energy, and entropy of activation in the particle-diffusion were determinedas 1.57 x 10^(-10) m^2/s, 11.9 kJ/mol, -84.1 J/(mol·K), respectively.

CL-P_(204)萃淋树脂分离铟(Ⅲ)镓(Ⅲ)锌(Ⅱ)

铟、镓作为重要的电子工业材料，在高技术领域有着广泛的应用．但是由于它们都是非常稀有而且分散的金属，至今以其为主要成份的主矿床尚未发现，它们通常是以微量的组分共生于锌矿等矿物中，因此，有关从锌矿中分离铟、镓的研究具有重要意义．由于铟、镓、锌３种离子的性...

CL-P204萃淋树脂对溶液中钒的吸附性能研究

探究CL-P204萃淋树脂对溶液中V(Ⅳ)的吸附效果。考察溶液pH、反应时间、初始浓度、温度对钒吸附容量的影响,并对吸附过程进行了动力学和热力学分析。结果表明,CL-P204萃淋树脂在298K、pH=1.6的条件下,吸附8h即可达到平衡,对V(Ⅳ)的最大吸附容量为34.2mg/g。树脂循环使用4次后对钒依然有良好的吸附效果。CL-P204萃淋树脂对钒的吸附过程符合准二级动力学方程和Langmuir等温吸附方程,是吸热熵增加的自发反应。

CL-P_(204)萃淋树脂吸萃铟(Ⅲ)的性能和机理

Di (2-ethylhexyl)phosphate levextrel resin(CL-P204) showed a maximum distribution coefficient for In(Ⅲ) adsorption at pH=1. 0 in sulfuric acid. The steady adsorption capacity was 48. 5 mg/g and the adsorption enthalpy was 9. 2 kJ/mol. The isothermal adsorption equation is Q=60. 2c0. 1 (25℃). The adsorption mechanism has been investigated by IRmeasurement.

CL-P204树脂对^(210)Bi吸附性能研究

为了解决^(210)Bi测量过程中^(210)Pb干扰问题,选择CL-P204萃淋树脂进行实验研究,实现了^(210)Pb和^(210)Bi有效分离。结果表明:^(210)Pb和^(210)Bi混合液经过树脂吸附和解析后,可快速将约90%的^(210)Bi单独分离出来,且误差小于10%,本方法不但极大地缩短了分析时间,而且提高了分析精度;利用CLP204萃淋树脂分离^(210)Bi,可以有效避免^(210)Pb对测量过程的干扰。

硫脲浸取-光度法测定硫化矿中金

常温下在H2 C2 O4 -H2 SO4 介质中 ,用 50 g/L硫脲 (Tu)溶液可完全浸提含金硫化矿中Au,对金的浸取率可达 99.8% ,然后使用CL -P2 0 4 萃淋树脂富集含金分解液中Au(Tu) + 2 ,结晶紫分光光度法测定。方法用于硫化原生矿及含硫浮选精矿中Au的测定 ,所得结果与王水分解原子吸收法测定相符 ,其RSD(n =5) <3%。

CS-30回旋加速器制备^(111)In

在四川大学CS-30回旋加速器上通过核反应^(Nat)Cd(p,xn)^(111)In进行了制备放射性核素^(111)In的研究。实验选用高纯度的天然镉作为靶材料,并采用电沉积法制备靶件,研究了辐照靶件的溶解以及放射化学分离方法。结果表明,采用26 MeV的质子轰击天然靶件,并采用CL-P204树脂将In与Cu^(2+)、Cd^(2+)、Zn^(2+)等杂质进行分离,可以得到产额(EOB 48h,即轰击结束48h后)约为25~28MBq/(μA·h)的^(111)In,其放射性核素纯度大于99%,Cu^(2+)和Cd^(2+)等化学杂质总质量浓度小于8.0mg/L。

Extraction and separation of Fe(Ⅲ) from heavy metal wastewater using P204 solvent impregnated resin

The extraction and separation of Fe（III） from heavy metal wastewater generated in zinc smelting process were studied using solvent impregnated resin containing CL- P2O4. The influence of pH and temperature on absorbing heavy metal cations by static adsorption was investigated. The batch tests on adsorption equilibrium, kinetics and elution efficiency were carried out to evaluate the performance of CL-P204. Column operations for extraction and separation of Fe（III） by CL-P2O4 were performed for further optimization of process parameters and feasibility evaluation. The reaction mechanism of Fe（III） and CL-P2O4 was analyzed through saturation capability, slope analysis and infrared spectroscopy （IR）. The results show that the separation of Fe（III） from heavy metal wastewater using CL- P2O4 can be achieved through process of adsorption and desorption at a flow rate of 1.53 ml·min^-1·cm^-2, pH 0.8 and temperature of 25℃. The experimental data of Fe（III） adsorption by CL-P2O4 have a satisfactory fit with Langmuir adsorption equation and Freundlich adsorption isotherms. The probable molecular formula of extracted complex is Fe[R2（R2H）], and the adsorption reaction equation is concluded as following： Fe3＋ ＋ 4RH 〈=〉Kex Fe[R2（R2H）] ＋ 3H＋ （Kex, extraction equilibrium constant）. This study will supply the fundamentals for treatment of heavy metal wastewater.