Adsorption Behaviors of Platinum Group Metals in Simulated High Level Liquid Waste Using Macroporous (MOTDGA-TOA)/SiO2-P Silica-based Absorbent
Adsorption Behaviors of Platinum Group Metals in Simulated High Level Liquid Waste Using Macroporous (MOTDGA-TOA)/SiO2-P Silica-based Absorbent
复制标题
大孔（MOTDGA-TOA）/SiO2-P 二氧化硅基吸附剂对模拟高放废液中铂族金属的吸附行为
DOI：
10.1080/01496395.2013.807290
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发表时间：
2013
影响因子：
2.8
通讯作者：
Tatsuya Ito
中科院分区：
文献类型：
--
作者：
I. Takagi;H. Watanabe;K. Sawada;K. Une;K. Sakamoto;T. Yano and B. Matovic;Tatsuya Ito
作为大孔硅基吸附剂从高放废液中分离铂族金属的基础研究，将N，N′-二甲基-N，N′-二正辛基硫代二甘醇酰胺（MOTDGA）和三正辛胺（TOA）分别浸渍到SiO2-P载体上，制备了（MOTDGA-TOA）/SiO2-P吸附剂。采用间歇法研究了该吸附剂对模拟高放废液中Ru（III）、Rh（III）和Pd（II）的吸附行为，获得了相应的平衡和动力学数据。该吸附剂对Pd（II）有较强的吸附作用，吸附在2 h内达到平衡。在0.1-1 M HNO 3浓度范围内，Pd（II）具有较高的分配系数（Kd）。此外，使用MOTDGA和TOA改善Ru（III）和Rh（III）的吸附优于单独使用它们。特别是Ru（III）在（MOTDGA-TOA）/SiO2-P吸附剂上的Kd值比单独用MOTDGA或TOA作萃取剂时的Kd值大3倍。Ru（III）、Rh（III）和Pd（II）的吸附遵循Langmuir吸附模型，并被发现受化学吸附机制控制。
As fundamental research for separation of platinum group metals (PGMs) from high level liquid waste (HLLW) by macroporous silica-based adsorbent, (MOTDGA-TOA)/SiO2-P adsorbent was prepared by impregnation ofN,N′-dimethyl-N,N′-di-n-octyl-thiodiglycolamide (MOTDGA) and Tri-n-octylamine (TOA) into silica/polymer composite support (SiO2-P). The adsorption behavior of Ru(III), Rh(III), and Pd(II) in simulated HLLW onto the adsorbent were investigated by the batch method to obtain their corresponding equilibrium and kinetic data. The adsorbent showed strong adsorption for Pd(II) and the adsorption reached equilibrium within 2 hr. High distribution coefficient (Kd) values for Pd(II) were obtained in 0.1–1 M HNO3concentration. In addition, the use of both MOTDGA and TOA improved adsorption of Ru(III) and Rh(III) better than individual use of them. Especially, theKdvalue for Ru(III) towards (MOTDGA-TOA)/SiO2-P adsorbent was three times larger than that in the adsorption using only with MOTDGA or TOA as extractant. The adsorptions of Ru(III), Rh(III), and Pd(II) followed the Langmuir adsorption model, and were found to be controlled by the chemisorption mechanism.