水热法羧基碳微球吸附铕(Ⅲ)动/热力学研究

Kinetic/thermodynamic study on adsorption of europium(Ⅲ) by hydrothermal carboxyl carbon microspheres

本文以葡萄糖和丙烯酸为原料,通过一步水热法合成表面含羧基的碳微球(HC-AA),通过扫描电镜(SEM)和红外光谱(FT-IR)对其结构及表面功能基团进行了表征。同时研究了HC和HC-AA对铕(Ⅲ)的吸附性能,并讨论了铕(Ⅲ)溶液初始pH值,振荡时间,铕的初始溶度和温度对两者吸附铕(Ⅲ)的影响,并用Langmuir和Freundlich吸附等温模型研究两种碳的吸附铕(Ⅲ)平衡时的数据;用准一级和准二级动力学模型研究了其动力学特性。热力学结果表明HC和HC-AA吸附铕(Ⅲ)都是吸热和自发的过程。

Carboxyl-containing carbon microspheres (HC-AA) were synthesized from glucose and acrylic acid by one-step hydrothermal method. Their structures and surface functional groups were characterized by scanning electron microscopy (SEM) and infrared spectroscopy (FT-IR). The adsorption properties of HC and HC-AA on Europium (III) were also studied. The effects of initial pH value, oscillation time, initial solubility and temperature of Europium (III) solution on their adsorption of Europium (III) were discussed. Langmuir and Freundlich adsorption isotherm models were used to study the adsorption equilibrium data of Europium (III) on two kinds of carbon;The Quasi-First-Order and quasi-second-order dynamic models were used to study their dynamic characteristics. Thermodynamic results showed that the adsorption of Europium (III) by HC and HCAA were both endothermic and spontaneous.