Cobalt and nickel uptake by silica-based extractants

Cobalt and nickel uptake by silica-based extractants
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二氧化硅基萃取剂对钴和镍的吸收

DOI:
10.1080/01496395.2017.1405034
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发表时间:
2017
影响因子:
2.8
通讯作者:
Pepper S
Pepper S
中科院分区:
工程技术4区
文献类型:
--
作者:
Pepper S

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测定了乙基/丁基膦酸酯二氧化硅(EBP-Si)的pKa,研究了各种参数对溶液中钴和镍的去除作用,并与Purolite S950进行了比较。pH值吸收实验表明,离子交换和酸解离的表面发生的组合。等温线数据,使用Langmuir和Dubininin-Radushkevich(D-R)模型拟合,表明与S950形成的络合物比与EBP-Si形成的络合物更强。动力学数据,采用伪二阶模型拟合,表明速率决定过程是金属离子与树脂的螯合功能的反应。EBP-Si的吸收速度比S950快两到三倍。
The pKas of ethyl/butyl phosphonate silica (EBP-Si) have been determined, and the removal of cobalt and nickel from solution was investigated as a function of various parameters and compared with those of Purolite S950. pH uptake experiments suggested a combination of ion exchange and acid dissociation of the surface occurring. Isotherm data, fitted using the Langmuir and Dubinin–Radushkevich (D-R) models, indicated that stronger complexes formed with S950 than with EBP-Si. Kinetic data, fitted using a pseudo-second-order model, suggested that the rate-determining process is the reaction of metal ions with the chelating functionality of the resin. Uptake by EBP-Si is two to three times faster than that on S950.
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