磁性聚苯胺吸附材料的制备及对碘的吸附性能研究

Preparation of Magnetic Polyaniline Adsorbent Material and Its Adsorption Performance for Iodine

研究了以聚苯胺(PANI)包覆四氧化三铁制备Fe_(3)O_(4)@PANI磁性吸附材料,并用于吸附水中的碘单质。采用SEM、TEM、FT-IR、XRD、VSM、XPS和Raman等方法对该复合材料吸附前后的形貌与性质进行表征,探究了该复合材料的吸附机制,同时考察了吸附时间、碘溶液浓度、吸附温度及再生对吸附性能的影响。结果表明:聚苯胺包覆四氧化三铁吸附溶液中的I_(2)时,碘分别与聚苯胺的苯环、醌环及醌环结构单元的氮原子结合;Fe_(3)O_(4)@PANI对I_(2)的吸附为自发吸热的过程,符合准二级动力学模型与Langmuir等温吸附模型;在303.15 K时,理论最大吸附量为1777.13 mg/g,负载吸附剂用乙醇脱附并循环使用3次后,其吸附率可达第1次吸附率的44.22%。

Polyaniline(PANI)coated iron tetroxide was used to prepare of Fe_(3)O_(4)@PANI magnetic adsorption material for the adsorption of iodine in water.The morphology and properties of the composite before and after adsorption were characterized by SEM,TEM,FT-IR,XRD,VSM,XPS and Raman,and the adsorption mechanism of the composite was explored.The effects of adsorption time,iodine solution concentration,adsorption temperature and regeneration on the adsorption properties were also investigated.The results show that iodine is bound to benzene ring,quinone ring and nitrogen atom of quinone ring structure unit of polyaniline when coated with ferric tetroxide adsorbed I_(2).The adsorption process of I_(2)by Fe_(3)O_(4)@PANI is endothermic and spontaneous,which accords with the quasi-second-order kinetic model and the Langmuir isothermal adsorption model.At 303.15 K,the theoretical maximum adsorption capacity is 1777.13 mg/g.After the adsorbent is desorbed with ethanol and recycled for 3 times,the adsorption rate reached 44.22%of the first adsorption rate.