%0 Journal Article
%T 负载氢氧化铁的膨胀石墨吸附剂的除磷
%A 张玲
%A 苏阳
%A 陆群赞
%A 王永
%J 同济大学学报(自然科学版)
%D 2016
%R 10.11908/j.issn.0253-374x.2016.09.018
%X 成功制备了负载氢氧化铁的膨胀石墨吸附剂(EG FeOH)，其最优制备条件为铁浓度0.26 mol?L-1、浸渍时间100min.通过对EG FeOH等温吸附线和动力学研究，发现EG FeOH更加符合Langmuir等温吸附模型和准二级动力学方程，说明EG FeOH的除磷过程以单分子层的化学吸附为主.通过热力学参数ΔHΘ(＞0)和ΔGΘ(＜0)说明EG FeOH吸附磷过程是自发吸热的，升温在一定程度上会提升EG FeOH的除磷吸附容量.EG FeOH对低浓度含磷水体(5 mg?L-1)有较好的除磷效果.通过吸附过程中溶液pH值变化和傅里叶红外变换光谱(FT IR)等分析手段，联合说明了EG FeOH主要通过离子交换作用和Lewis酸碱相互作用进行吸附除磷.以NaOH为脱附液，实现了对EG FeOH的脱附再生.</br>The expanded graphite loaded with ferric hydroxide (EG FeOH) is prepared successfully. Its most suitable synthesis conditions are 0.26mol/L of ironic concentration and 100min of immersion time, respectively. The Langmuir model and the pseudo second order model are more suitable for well elucidation of the experimental data, indicating that the adsorption of phosphate is a monolayer chemisorption process. The positive ΔHΘ and negative ΔGΘ indicate that the process of phosphorus adsorption onto EG FeOH is spontaneous and endothermic. It is favorable for the phosphorus adsorption with the rising of temperature to some extent. EG FeOH performs excellently for phosphate adsorption in low concentration (5 mg?L-1). The ion exchange and lewis acid base interactions are manifested to be two main mechanisms for phosphate adsorption of EG FeOH revealed by Fourier transform infrared (FT IR) spectroscopy and change of pH values associated with the adsorption process. The EG FeOH after adsorption is also recovered using sodium hydroxide (NaOH)
%K 膨胀石墨 氢氧化铁 除磷 吸附 机理&lt
%K /br&gt
%K expanded graphite iron hydroxide phosphorus removal adsorption mechanism
%U http://tjxb.cnjournals.cn/ch/reader/view_abstract.aspx?file_no=16006&flag=1