中文摘要：

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Fe3O4表面包覆一层聚合多巴胺（PDA）,得到Fe3O4/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Fe3O4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Fe3O4/PDA的吸附性能。研究表明,溶液pH对2种染料的吸附有显著的影响,随溶液pH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。

英文摘要：

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.