Selective uptake and recovery of palladium by biopolymer microcapsules enclosing Cyanex 302 extractant
Selective uptake and recovery of palladium by biopolymer microcapsules enclosing Cyanex 302 extractant
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DOI：
10.1080/18811248.2001.9715038
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发表时间：
2001-05-01
影响因子：
1.2
通讯作者：
Onodera, Y
中科院分区：
文献类型：
--
作者：
Mimura, H;Ohta, H;Onodera, Y
铂族金属的选择性吸收和回收是高放废液处理的重要课题。利用生物聚合物（藻酸盐和藻酸凝胶聚合物）的高度固定能力，将对钯具有强亲和性的萃取剂双（2，4，4-三甲基戊基）单硫代膦酸（Cyanex 302，HA）封装到微胶囊中。用间歇法和柱吸附法研究了颗粒微胶囊对Pd ~（2+）、Ru（NO）~（3+）和Rh ~（3+）的吸附。在0.2- 0.5M HNO_3存在下，P_2 ~+、K-d、Pd的分配系数大于10（4）cm（3）/g，Pd/Ru和Pd/Rh的分离因子大于10（2）。微胶囊对Pd ~（2+）的吸附符合Langmuir吸附等温线，最大吸附量为0.72-0.96 mmol/g。这些金属阳离子可以通过填充HA-海藻酸微胶囊的柱进行色谱分离。
Selective uptake and recovery of platinum group metals are an important subject in the high level liquid waste treatment. An extractant having a strong affinity for palladium, bis(2,4,4-trimethylpentyl) monothiophosphinic acid (Cyanex 302, HA), was enclosed into microcapsules by utilizing highly immobilizing ability of biopolymer (alginate and alginic acid gel polymers). The uptake of Pd2+, Ru(NO)(3+) and Rh3+ for granular microcapsules has been studied by batch and column methods. A relatively large distribution coefficient of P2+, K-d.Pd, of above 10(4) cm(3)/g was obtained in the presence of 0.2-0.5 M HNO3 and the separation factors of Pd/Ru and Pd/Rh were estimated to he above 10(2). The uptake of Pd2+ on microcapsules followed a Langmuir-type uptake isotherm and the maximum uptake capacity was estimated to be 0.72-0.96 mmol/g. These metal cations M ere chromatographically separated through the column packed with HA-alginate microcapsules.