常压下Fe3O4@C磁性复合材料的制备及其对亚甲基蓝的吸附

摘要

以共沉淀法合成的Fe3O4为载体,在常温常压下,利用浓硫酸蔗糖碳化法制备出Fe3O4@C磁性复合材料,通过傅里叶变换红外光谱仪(FTIR)、X射线粉末衍射仪(XRD)、扫描电镜(SEM)、透射电镜(TEM)和磁学测量系统(MPMS)手段对合成的磁性复合材料进行表征,并研究了Fe3O4@C对水中亚甲基蓝的吸附性能.考察了吸附剂用量、溶液pH、吸附温度、震荡时间等因素对吸附过程的影响.结果表明,Fe3O4@C表面分布有大量不规则的孔道,其饱和磁化强度为18.45emu/g;当亚甲基蓝初始浓度为100mg/L,吸附剂加入量1g/L,吸附时间150min,吸附温度25℃,pH=12时,得到吸附容量为96.74mg/g.Fe3O4@C对水中亚甲基蓝的吸附符合Langmuir模型,吸附过程动力学符合准二级动力学方程,吸附过程是吸热及熵增加的过程;Fe3O4@C经过稀硫酸溶液解吸之后可以重复利用.%Under ambient temperature and pressure,the magnetic Fe3O4@C was synthesized by sulfuric acid sucrose carbonization method and with Fe3O4synthesized by co-precipitation and as the carrier.The resulting products were characterized by Fourier transform infrared spectra(FTIR),X-ray powder diffraction(XRD),scanning electron microscope(SEM),transmission electron microscope (TEM),and magnetic property measurement system(MPMS).The Fe3O4@C was tested for the ability to remove methylene blue(MB).The effects of adsorbent dosage,solution pH,adsorption temperature and oscillating time on the adsorption process were investigated.The results showed that there are a lot of irregular holes in the surface of Fe3O4@C and its saturation magnetization is 18.45emu/g.When the initial concentration of MB is 100mg/L,adsorbent dosage is 1g/L,adsorption time is 150min,adsorption temperature at 25℃,pH=12,the maximum adsorption capacity reaches 96.74mg/g.The experimental data fitted well with Langmuir model.The adsorption kinetic fitted well with the pseudo-second-order kinetic,and the adsorption of MB was an endothermic and the confusion degree increase process.Fe3O4@C could be regenerated by washing with H2SO4aqueous solution.