中文摘要：

采用乙醇辅助液相共沉淀法制备Ca-Al-LDH（层状双金属氢氧化物）,运用X射线衍射仪（XRD）和傅里叶变化红外光谱仪（FA-RT）对吸附前后的Ca-Al-LDH样品进行表征,并研究了Ca-Al-LDH对富里酸的吸附性能及其影响因素。结果表明：Ca-Al-LDH对富里酸吸附容量随p H的变化呈先增加后递减趋势,在p H为4时吸附容量达35.5 mg/g;吸附过程在24 h达到平衡;添加电解质Na NO3可抑制富里酸的吸附作用;吸附过程符合Langmuir模型,且吸附动力学过程符合准二级动力学方程。

英文摘要：

The research synthesized Ca-Al-LDH（ layered double hydroxides） with liquid precipitation method,and evaluated its performance in fulvic acid adsorption under different impact factors. Samples before and after fulvic acid adsorption were characterized by X-ray diffraction and infrared spectroscopy. The experimental results showed that the adsorption capacity of Ca-Al-LDH on the fulvic acid adsorption increased first and then decreased with the increase of p H,and the maximum adsorption capacity was at p H = 4. The adsorption process reached equilibrium at 24 h. Additionally,co-existing competitive anions influenced fulvic acid adsorption. From batch adsorption experiments,we found that the adsorption fitted Langmuir model very well,the maximum adsorption capacity was 35. 5mg/g. The adsorption kinetics followed a pseudo-second-order model.