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首页> 外文期刊>Separation and Purification Technology >Pt recovery using Cyphos IL-101 immobilized in biopolymer capsules
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Pt recovery using Cyphos IL-101 immobilized in biopolymer capsules

机译：使用固定在生物聚合物胶囊中的Cyphos IL-101回收铂

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Cyphos~R IL~(-1)01, a tetraalkylphosphonium chloride salt (ionic liquid, IL) has been immobilized in capsules prepared by ionotropic gelation in calcium chloride solutions. The IL content was varied in the resin between 0.29 and 1.28 mmolILg~(-1). These resins have been tested for Pt recovery from HCl solutions. The equilibrium was very slightly affected by the concentration of HCl and chloride ions. The sorption isotherms were modeled using the Langmuir equation: the maximum sorption capacity was influenced by the drying of the resin but remained close to 177 mg Pt g~(-1) for wet resin (i.e. 0.9 mmol Pt g~(-1), dry weight basis, or 0.7molPtmol~(-1) Cyphos) and 142mgPtg~(-1) for dry resin (i.e. 0.73mmol Pt g~(-1), or 0.57mol Pt mol~(-1) Cyphos). The presence of nitrates, nickel or copper ions (added under the form of chloride salts) did not significantly decrease sorption capacity even at concentrations as high as 5gL~(-1). Conversely, zinc at the concentration of 5 g L~(-1), significantly decreased Pt sorption, probably due to the competition effect of chloro-anionic Zn species. This is another evidence of the ion exchange mechanism involved in the binding of hexachloroplatinate species. The kinetics are weakly affected by the agitation speed (in the range 150-350 rpm) indicating that the resistance to film diffusion is not the limiting step. The kinetics are affected by the IL content, metal concentration and more specifically the drying of the resin: intraparticle diffusion sounds to be the controlling kinetic step: the intraparticle diffusion coefficient varied between 2 x 10~(-12) and 18 x 10~(-11) m~2 min~(-1), depending on experimental conditions. Platinum can be desorbed from loaded resin using either nitric acid (5 M) or thiourea (0.1 M in 0.1 M HCl acid solution). The resin was efficiently used for three sorption/desorption cycles using nitric acid: a decrease in sorption capacity and desorption efficiency was observed beginning with the third cycle, probably due to a progressive degradation of the res
机译：Cyphos®R IL _（-1）01，一种四烷基chloride氯化物盐（离子液体，IL）已被固定在通过离子凝胶法在氯化钙溶液中制备的胶囊中。树脂中的IL含量在0.29和1.28 mmolILg〜（-1）之间变化。已对这些树脂从HCl溶液中回收Pt进行了测试。平衡受HCl和氯离子浓度的影响很小。吸附等温线使用Langmuir方程建模：最大吸附容量受树脂干燥的影响，但对于湿树脂（即0.9 mmol Pt g〜（-1），最大吸附容量保持在177 mg Pt g〜（-1），以干重计，或以干树脂计为0.7molPtmol〜（-1）Cyphos和142mgPtg〜（-1）（即0.73mmol Pt g〜（-1）或0.57mol Pt mol〜（-1）Cyphos）。硝酸盐，镍或铜离子（以氯化物盐的形式添加）的存在即使在浓度高达5gL〜（-1）时也不会显着降低吸附能力。相反，浓度为5 g L〜（-1）的锌会显着降低Pt吸附，这可能是由于氯阴离子Zn物质的竞争作用所致。这是涉及六氯铂酸酯类物质结合的离子交换机理的另一证据。动力学受搅拌速度（在150-350 rpm范围内）的影响很小，表明对膜扩散的抵抗力不是限制步骤。动力学受IL含量，金属浓度以及树脂干燥的影响：颗粒内的扩散声是控制动力学的步骤：颗粒内的扩散系数在2 x 10〜（-12）和18 x 10〜（ -11）m〜2 min〜（-1），取决于实验条件。可以使用硝酸（5 M）或硫脲（0.1 M的0.1 M HCl溶液）将铂从负载的树脂上解吸。该树脂有效地用于使用硝酸的三个吸附/解吸循环：从第三个循环开始观察到吸附容量和解吸效率下降，这可能是由于树脂的逐步降解

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