功能磁性核壳纳米颗粒制备及对双酚A的吸附

Spherical iron oxide nanoparticles were prepared by the hydrothermal method. After surface modification, two adsorbents were obtained and used for the adsorption of bisphenol A. The physical structures of the two adsorbent materials were characterized by transmission electron microscopy, infrared spectroscopy analysis, thermogravimetric analyzer and nitrogen adsorption - desorption isotherm meter. The results show that a core - shell magnetic mesoporous silica nanosorbent (Fe_3O_4@mSiO_2) was successfully prepared, with a pore diameter of about 2 nm and a specific surface area of about 160 cm²/g; it was further modified to obtain a phenyl - modified adsorbent material (Fe_3O_4@mSiO_2@PhTES). The adsorption characteristics of the two adsorbents for bisphenol A were explored through kinetic simulation. The results show that the adsorption kinetics of both for bisphenol A conform to the pseudo - second - order kinetic model. Compared with Fe_3O_4@mSiO_2, the adsorption capacity of Fe_3O_4@mSiO_2@PhTES for bisphenol A is significantly increased, reaching a maximum of 109 mg/g. This is mainly because the benzene ring in the molecule interacts with the phenyl on the surface of the adsorbent in a π - π conjugated manner to enhance the adsorption performance.

采用水热法制备了球形四氧化三铁纳米颗粒,对其表面改性后得到两种吸附剂并用于对双酚A的吸附。借助透射电镜、红外光谱分析、热重分析仪和氮气吸脱附等温仪对两种吸附材料进行物理结构表征。结果表明:成功制备了核壳磁性介孔氧化硅纳米吸附剂(Fe_3O_4@mSiO_2),孔径约为2nm,比表面积约为160cm~2/g;对其进一步改性得到苯基改性吸附材料(Fe_3O_4@mSiO_2@PhTES)。通过动力学模拟探究了两种吸附剂对双酚A的吸附特性。结果表明:二者对双酚A的吸附动力学均符合拟二级动力学模型,与Fe_3O_4@mSiO_2相比,Fe_3O_4@mSiO_2@PhTES对双酚A的吸附量明显增加,最高达109mg/g。主要是分子中苯环以π-π 共轭方式与吸附剂表面苯基发生作用增强吸附性能。