聚多巴胺包覆的Fe_3O_4去除水体中的染料  

Polydopamine biopolymer coated magnetic nanoparticles for dyes removal from solution

作　　者：李晓燕[1] 宋娟 张升晓[1] 张媛媛[1] 刘军深[1] 徐强[1] 

机构地区：[1]鲁东大学化学与材料科学学院,烟台264025 [2]烟台市环境监察大队,烟台264003

出　　处：《环境工程学报》2015年第12期5807-5812,共6页Chinese Journal of Environmental Engineering

基　　金：国家自然科学基金资助项目(21207059;21171085);山东省自然科学基金资助项目(ZR2011BQ012)

摘　　要：多巴胺作为海洋贝类生物分泌的粘附蛋白的模拟小分子物质,在典型的海洋环境条件下能够发生自聚合反应覆盖到不同基质上。通过多巴胺的自聚合在磁性纳米Fe_3O_4表面包覆一层聚合多巴胺(PDA),得到Fe_3O_4/PDA复合材料。材料的热重分析,磁滞回线,透射电镜,红外光谱等表明PDA包覆到了Fe_3O_4的表面。PDA具有丰富的酚羟基和氨基,可以通过络合、配位、氢键、π-π堆积等多种作用与其他物质结合。采用亚甲基蓝和日落黄染料作为目标物考察Fe_3O_4/PDA的吸附性能。研究表明,溶液p H对2种染料的吸附有显著的影响,随溶液p H的升高,阳离子染料亚甲基蓝的吸附容量显著增大,而阴离子染料日落黄吸附容量明显下降。由Langmuir吸附等温模型拟合出亚甲基蓝、日落黄的最大吸附容量分别为204.1和100.0 mg/g。动力学研究表明,这2种染料的吸附能够快速达到平衡。Dopamine,as a small-molecule mimic of adhesive proteins secreted by mussel,can polymerize spontaneously under typical marine environment to deposite onto various matrix. In this study the polydopamine polymer decorated with magnetic nanoparticles（ Fe3O4/PDA） was synthesized and applied for removal of dye pollutants. Characterization with thermo-gravimetric analyses,vibrating sample magnetometer,transmission electron microscope,infrared spectra,and X-ray photoelectron spectroscopy demonstrated that Fe3O4 was covered with PDA polymer successfully. Based on the catechol and amine groups,the PDA polymer provided multiple covalent and noncovalent interactions including chelation,hydrogen bonds,Van der Waals force and π-π stack to combine with pollutants. To investigate the adsorption ability of Fe3O4/PDA,organic dyes were selected as target pollutants. The adsorption of pollutants was pH dependent due to the variation of surface charges at different solution pH. Under the optimal solution pH,the maximum adsorption capacity calculated from Langmuir adsorption isotherm for methylene blue,tartrazine were 204. 1 and 100. 0 mg/g,respectively. The Fe3O4/PDA shows great potential for dye pollutants removal.

关 键 词：FE3O4纳米粒子 聚合多巴胺 染料 吸附 

分 类 号：X703[环境科学与工程—环境工程]