阴离子交换树脂回收水相中有机磷酸萃取剂

doi:10.11944/j.issn.1000-0518.2018.07.170321

摘要/Abstract

摘要：

研究了阴离子交换树脂对水相中有机磷酸萃取剂的吸附。通过比较不同的离子交换树脂对水相中2-乙基己基膦酸-单-2-乙基己基酯(P507)的去除率,发现大孔强碱性阴离子交换树脂(D201-OH)从水溶液中去除P507的能力最强,去除率可达99.24%。而且当溶液在pH=1.0时,D201-OH对P507的吸附主要是分子吸附,其吸附等温线更适用于Langmuir模型;当溶液在pH=5.0时,阴离子交换反应占主导地位,其吸附等温线更适用于Freundlich模型。研究还表明,D201-OH对P507的吸附在20 min内即达到吸附平衡时99.8%的吸附量。通过动力学研究表明,拟一级动力学模型(R²>0.99)更适用于描述实验数据,并且吸附速率主要受膜扩散控制。此外,吸附-解吸附循环8次后,D201-OH的吸附能力仍然保持在93%以上。综上所述,D201-OH是有机磷酸类萃取剂的良好吸附剂,其吸附性能高效,循环过程稳定,因此可用于实际生产过程中回收有机磷酸萃取剂。

关键词: 阴离子交换树脂, 有机磷酸萃取剂, 吸附机理, 循环实验

Abstract:

The adsorption process of anion exchange resin to organphosphorus extractant in water was explored in this work. By comparing the removal of P507(2-ethylhexyl phosphoric acid mono-2-ethylhexyl ester) in water with different anion exchange resins, it is found that D201-OH(macroporous strong basic anion exchange resin) has the strongest ability to remove P507 from water, and the removal rate can reach to 99.24%. Secondly, at pH=1.0, the adsorption of P507 on D201-OH is mainly molecular adsorption and its adsorption isotherm is better fit to the Langmuir model; at pH=5.0, the anion exchange reaction is dominant and its adsorption isotherm is more suitable for the Freundlich model. Furthermore, the adsorption capacity of D201-OH to P507 reaches 99.8% of which in the adsorption equilibrium in 20 min. Kinetic study shows that the pseudo-first-order model(R²>0.99) exhibits a better fit to describe the experimental data and the adsorption rate may be controlled mainly by the film diffusion. Moreover, the adsorption capacity of D201-OH remains above 93% after eight cycles of adsorption-desorption. In summary, D201-OH is an excellent adsorbent for organphosphorus extractants with high stability in the repeated cycle. Therefore, it can be used to recover organphosphorus extractant in the practical production process.

Key words: anion exchange resin, organphosphorus extractant, adsorption mechanism, cycle experiment

苏文柔, 陈继, 邓岳锋, 杨茂华, 刘川楹. 阴离子交换树脂回收水相中有机磷酸萃取剂[J]. 应用化学, 2018, 35(7): 802-811.

Wenrou SU, Ji CHEN, Yuefeng DENG, Maohua YANG, Chuanying LIU. Recovery of Organphosphorus Extractants from Water by Anion Exchange Resin[J]. Chinese Journal of Applied Chemistry, 2018, 35(7): 802-811.

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