Selective separation of Pd(II) through ion exchange and oxidation-reduction with hexacyanoferrates from high-level liquid waste
Selective separation of Pd(II) through ion exchange and oxidation-reduction with hexacyanoferrates from high-level liquid waste
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通过离子交换和六氰基铁酸盐氧化还原从高放废液中选择性分离 Pd(II)
DOI：
10.1016/j.seppur.2019.115932
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发表时间：
2020-01
影响因子：
8.6
通讯作者：
Wei Yuezhou
中科院分区：
文献类型：
--
作者：
Wang Qilong;Sang Hongji;Chen Lifeng;Wu Yan;Wei Yuezhou
合成了大孔硅基六氰高铁镍（KNiHC/SiO2）吸附剂，用于高放废液（HLLW）中钯（Pd(II)）的分离。通过XPS分析，Pd在344.4 eV处的3d5/2光谱对应于金属钯Pd(0)，表明Pd在吸附过程中发生了离子交换和氧化还原反应。压汞孔隙仪（MIP）测试结果表明，KNiHC/ sio2的平均孔径为37.6 nm。KNiHC/ sio2对Pd（II）的吸附在1 h内达到平衡状态，符合准二级动力学模型，为化学吸附。在1 M nano3和3 M hno3的混合物中，吸附剂对Pd（II）的最大吸附量为46.09 mg/g。实验数据与Langmuir和Redlich-Peterson等温线模型吻合较好。此外，在较宽的hno3浓度范围内，KNiHC/ sio2对Pd（II）的选择性高于共存的贵金属，即Rh（III）和Ru（III）。不同进料流量下的s型突破曲线表明吸附剂在柱状体系中具有良好的动态吸附性能。
A macro porous silica-based nickel hexacyanoferrate (KNiHC/SiO2) adsorbent was synthesized for separation of palladium (Pd(II)) from high-level liquid waste (HLLW). Based on XPS analysis, the Pd 3d5/2spectrum at 344.4 eV corresponds to metallic palladium Pd(0), indicating that ion-exchange and redox reactions occur in the adsorption of Pd. Mercury intrusion porosimeter (MIP) test results show that the average pore size of KNiHC/SiO2is 37.6 nm. The adsorption of KNiHC/SiO2for Pd(II) reaches the equilibrium state within 1 h and follows the pseudo-second-order kinetic model, which indicates chemical adsorption. The maximum adsorption capacity of the adsorbent for Pd(II) in the mixture of 1 M NaNO3and 3 M HNO3is 46.09 mg/g. The experimental data fit well with the Langmuir and Redlich-Peterson isotherm models. Furthermore, KNiHC/SiO2exhibits high selectivity toward Pd(II) over co-existing noble metals, namely, Rh(III) and Ru(III) within a wide range of HNO3concentrations. The sharp S-shaped breakthrough curves in different feed flow rates suggest the excellent dynamic adsorption performance of the adsorbent in column systems.
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影响因子：
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影响因子：
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