Wu Hao, Oosawa Naoki, Kubota Masahiko, Kim Seong-Yun
Department of Quantum Science and Energy Engineering, Graduate School of Engineering, Tohoku University, Sendai, 980-8579, Japan.
Anal Sci. 2020 Dec 10;36(12):1541-1545. doi: 10.2116/analsci.20P253. Epub 2020 Aug 28.
The adsorption behaviors of a silica-based hybrid donor adsorbent (TAMIA-EH+1-dodecanol)/SiO-P towards Pd(II) were investigated under the effect of the contact time, temperature etc. in simulated high-level liquid waste. The adsorption rates of Pd(II) and Re(VII) were fairly fast and could reach the equilibrium state in only 1 h compared with other co-existing metal ions. The adsorption kinetics of Pd(II) was found to fit well with the pseudo-first order model. Even though with increasing the concentration of HNO above 1 M, the adsorption performance of (TAMIA-EH+1-dodecanol)/SiO-P decreased gradually; it still exhibited a better selectivity towards Pd(II) when [HNO] > 0.5 M. The adsorption isotherms of Pd(II) and Re(VII) were well-described by the Langmuir isotherm model, while the Freundlich isotherm model was considered to be more suitable for the adsorption of Ru(III), Zr(IV) and Mo(VI). A high temperature of an aqueous solution was not good for the effective recovery of Pd(II). The calculated thermodynamic parameters revealed that the adsorption of Pd(II) was exothermic in nature.
在模拟高放废液中，研究了基于二氧化硅的混合供体吸附剂（TAMIA-EH+1-十二烷醇）/SiO-P对Pd(II)的吸附行为，考察了接触时间、温度等因素的影响。与其他共存金属离子相比，Pd(II)和Re(VII)的吸附速率相当快，仅需1小时就能达到平衡状态。发现Pd(II)的吸附动力学符合准一级模型。尽管当HNO浓度高于1 M时，(TAMIA-EH+1-十二烷醇)/SiO-P的吸附性能逐渐下降；但当[HNO] > 0.5 M时，它对Pd(II)仍表现出较好的选择性。Pd(II)和Re(VII)的吸附等温线可用Langmuir等温线模型很好地描述，而Freundlich等温线模型被认为更适合于Ru(III)、Zr(IV)和Mo(VI)的吸附。水溶液的高温不利于Pd(II)的有效回收。计算得到的热力学参数表明，Pd(II)的吸附本质上是放热的。
