合成碳羟基磷灰石对水中双酚A的吸附性能研究

利用废弃蛋壳为原料、尿素为添加剂，合成纳米碳羟基磷灰石(CHAP)用于吸附水中双酚A（BPA）。利用红外光谱、扫描电镜和X射线能谱测试技术对CHAP样品表面化学进行了表征，同时考察了环境因子pH值、吸附时间和BPA初始浓度对吸附的影响。实验结果表明，CHAP对BPA去除率在酸性（pH=3～6）溶液中较好，而在中性和碱性环境中减弱。通过静态吸附实验数据计算分析得知，CHAP对BPA吸附符合Langmuir和Freundlich等温式，准二级动力学模型比准一级动力学模型能更好地描述CHAP对BPA吸附动力学行为。

Study on adsorption characteristic of carbonate hydroxylapatite for biphenol-A from aqueous solution

The adsorption of biphenol-A( BPA) from aqueous solution by home-made carbonate hydroxylap-atite (CHAP) synthesized by using abandoned eggshell and urea was characterized by FT-IR,SEM and EDS. Factors that might influence the adsorption performance were investigated, such as pH values, adsorption period, biphenol-A initial concentration from aqueous solution. The results showed that absorption of biphenol-A on the CHAP was better pH =3～6 than pH > 6 from aqueous solution. The equilibrium sorption datas could be de-scribed by the Langmuir and Freundlich isotherm models. The second-order kinetic model provided the best cor-relation of the used experimental data compared to the first-order kinetic model.