论文部分内容阅读
通过响应面法,对增强凝胶型弱酸性树脂(110-H)在水溶液中对稀土元素铕的吸附作用进行优化。实验表明在最佳条件下110-H对铕的吸附量(346.85 mg/g)令人满意,是目前对铕离子吸附量最高的材料之一。吸附过程拟合一级反应动力学和朗缪尔等温线模型,吸附热力学参数分别为ΔH=36.1 k J/mol,ΔS=200 J/(mol·K)。解吸实验表明110-H可以用浓度为0.1 mol/L的HCl溶液洗脱以实现再生。用红外光谱和扫描电镜技术对比树脂吸附金属离子前、后特征以分析其吸附机理。
The response surface methodology was used to optimize the adsorption of europium, a rare earth element, in a weakly acidic gelling resin (110-H) in aqueous solution. The experimental results show that 110-H adsorbed on europium (346.85 mg / g) is satisfactory under optimal conditions, which is one of the most abundant materials for europium ion adsorption. The first order reaction kinetics and the Langmuir isotherm model were fitted by the adsorption process. The adsorption thermodynamic parameters were ΔH = 36.1 kJ / mol and ΔS = 200 J / (mol · K), respectively. Desorption experiments showed that 110-H can be eluted with 0.1 mol / L HCl solution to achieve regeneration. The adsorption characteristics of the resin before and after the adsorption of metal ions were compared by infrared spectroscopy and scanning electron microscopy to analyze the adsorption mechanism.