Development of Material for Chemical Separation using Hydrophobic Surface of Recycled Polyvinylchloride

利用再生聚氯乙烯疏水表面开发化学分离材料

基本信息

批准号：
16550136
负责人：
SAKA Yukio
金额：
$ 2.48万
依托单位：
University of Miyazaki
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2004
资助国家：
日本
起止时间：
2004 至 2007
项目状态：
已结题

项目摘要

(1) Distribution behaviors of aromatic compounds containing phenol and its derivatives in water were investigated by mixing recycled polyvinylchloride (RPVC) from agricultural use. The distribution was found to increase in the order phenol<p-cresol<p-ethylphenol<p-propylphenol<p-buthylphenol. To find out the role of the plasticizer in the RPVC, the distribution coefficients of these aromatic compounds between di-2-ethylhexyl phthalate and water were determined to reveal that the hydorophobicity of the solute played important role for the distribution. The adsorption of PVC resin of these compounds was relatively small compared to the plasticizer. In conclusion, the hydrophobic substances in water were extracted to the plasticizer in the RPVC.(2) The surface of the RPVC was coated with trioctylmethylammonium chloride (TOMAC) by mixing its 50% THF-H_2O solution with RPVC. The TOMAC in water solution was estimated by ion-pair extraction method with picric acid. These results show that a considerable amount of TOMAC is soluble in water. But the solubility was depressed by the addition of such an electrolyte substance as NaCl, KNO_3 and HCl.(3) The distribution behaviors of gold (III), platinum (IV) and palladium (II) in 1M-HCl to RPVC loaded TOMAC were investigated. The rate of distribution was found to decrease as follows ; Au (III)>Pt(IV) >Pd(II). The distribution ratio of the metal ions such as Zn(II), Cu (II) and Fe (III) was small compared to that of precious metal ions. Elution of the adsorbed precious metal ions from RPVC was investigated using 0.1M thiourea solution. The recovery of Au ((III) was about 80%. On the other hand, the recoveries of Pd (II) and Pt (IV) were about 40% and 10% respectively under the same condition.

（1）通过使用农业用途混合回收的聚氯乙烯（RPVC），研究了含有苯酚及其衍生物的芳香族化合物的分布行为。发现该分布在苯酚<p- cresol <p-乙基苯酚<p-丙基苯酚<p-buthyl-phenolol的顺序上增加。为了找出增塑剂在RPVC中的作用，确定了DI-2-乙基己酸酯和水之间这些芳族化合物的分布系数，以揭示溶质的羟基症对分布起着重要作用。与增塑剂相比，这些化合物的PVC树脂的吸附相对较小。总之，将水中的疏水物质提取到RPVC中的增塑剂中。（2）通过将其50％THF-H_2O溶液与RPVC混合，将RPVC的表面与三辛基甲基铵（Tomac）涂在一起。通过用苦味酸的离子对提取方法估算水溶液中的TOMAC。这些结果表明，大量的Tomac可溶于水。但是，通过在1M-HCl中添加了NaCl，KNO_3和HCl（3）将NaCl，KNO_3和HCl的电解质物质添加到RPVC负载的tomac中的分布行为，从而使溶解度降低。发现分布速率如下降低。 au（iii）> pt（iv）> pd（ii）。与贵金属离子相比，锌（II），Cu（ii）和Fe（III）等金属离子的分布比很小。使用0.1m硫库溶液研究了RPVC吸附的贵金属离子的洗脱。 AU的回收率（（III）约为80％。另一方面，在相同情况下，PD（II）和PT（IV）的回收率分别约为40％和10％。