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Abstract：
This article investigated the kinetic studies of thorium adsorption from an aqueous solution with graphene oxide functionalized with aminomethyl phosphonic acid (AMPA) as an adsorbent. First, the AMPA-GO adsorbent was characterized using TEM, XRD, and FTIR methods. Experiments were performed in two batch and continuous modes. In batch mode, adsorption kinetics were studied in different pH (1-4), temperature (298-328 K), initial concentration (50-500 mg L-1), and dosages (0.1-2 g L-1). The results showed that thorium adsorption kinetic follows pseudo-first-order kinetic model and that the adsorption reaction is endothermic. The maximum experimental adsorption capacity of thorium ions was observed 138.84 mg g-1 at a pH of 3, adsorbent dosage of 0.5 g L-1, and a temperature of 328 K. The results showed that AMPA-GO adsorbent can be used seven times with an acceptable change in adsorption capacity. In continuous conditions, the effect of feed flow rate (2-8 mL min-1), initial concentration (50-500 mg L-1), and column bed height (2-8 cm) was investigated. The continuous data was analyzed using the Thomas, Yoon-Nelson, and Bohart-Adams models. The experimental data of the column were well matched with the Thomas, and Yoon-Nelson models. The research results showed that the use of functionalized graphene oxide adsorbents has a great ability to remove thorium from aqueous solutions.
摘要：
本文研究了以氨甲基膦酸（AMPA）为吸附剂的氧化石墨烯从水溶液中吸附钍的动力学研究。首先,使用TEM对AMPA-GO吸附剂进行了表征，XRD,和FTIR方法。实验以两种间歇和连续模式进行。在批处理模式下，研究了在不同pH(1-4)下的吸附动力学，温度（298-328K），初始浓度（50-500mgL-1），和剂量（0.1-2gL-1）。结果表明，钍吸附动力学符合拟一级动力学模型，吸附反应是吸热的。在pH为3，吸附剂用量为0.5gL-1，温度为328K时，观察到对钍离子的最大实验吸附容量为138.84mgg-1。结果表明，AMPA-GO吸附剂可以使用7次，吸附容量变化可接受。在连续条件下,进料流量的影响（2-8mLmin-1），初始浓度（50-500mgL-1），和柱床高度（2-8厘米）进行了调查。使用Thomas分析了连续数据，Yoon-Nelson,和Bohart-Adams模特.色谱柱的实验数据与Thomas,和Yoon-Nelson模型.研究结果表明，使用功能化的氧化石墨烯吸附剂具有很大的去除水溶液中钍的能力。
