Department of Environmental Engineering, School of Metallurgy and Environment, Central South University , Changsha 410017, P. R. China.
ACS Appl Mater Interfaces. 2013 Dec 11;5(23):12449-59. doi: 10.1021/am403533v. Epub 2013 Nov 22.
Hierarchical porous Fe3O4 particles with tunable grain size were synthesized based on a facile poly (diallyldimethylammonium chloride) (PDDA)-modulated solvothermal method. The products were characterized with scanning electron microscopy (SEM) and transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), N2 adsorption-desorption technique, vibrating sample magnetometer (VSM), and dynamic light scattering (DLS). The results show that increasing the PDDA dosage decrease the grain size and particle size, which increased the particle porosity and enhanced the surface area from 7.05 to 32.75 m(2) g(-1). Possible mechanism can be ascribed to the PDDA function on capping the crystal surface and promoting the viscosity of reaction medium to mediate the growth and assembly of grain. Furthermore, the arsenic adsorption application of the as-obtained Fe3O4 samples was investigated and the adsorption mechanism was proposed. High magnetic Fe3O4 particles with increased surface area display improved arsenic adsorption performance, superior efficiency in low-level arsenic removal, high desorption efficiency, and satisfactory magnetic recyclability, which are very promising compared with commercial Fe3O4 particles.
基于简便的聚二烯丙基二甲基氯化铵（PDDA）调控的溶剂热法，合成了具有可调节粒径的分级多孔 Fe3O4 颗粒。通过扫描电子显微镜（SEM）和透射电子显微镜（TEM）、X 射线光电子能谱（XPS）、傅里叶变换红外光谱（FT-IR）、X 射线衍射（XRD）、N2 吸附-脱附技术、振动样品磁强计（VSM）和动态光散射（DLS）对产物进行了表征。结果表明，增加 PDDA 用量会减小晶粒和颗粒尺寸，从而增加颗粒的孔隙率和比表面积，从 7.05 增加到 32.75 m2/g。可能的机制可以归因于 PDDA 对晶体表面的封端作用以及对反应介质粘度的促进作用，从而调节晶粒的生长和组装。此外，还研究了所获得的 Fe3O4 样品的砷吸附应用，并提出了吸附机制。具有高表面积的高磁性 Fe3O4 颗粒表现出改善的砷吸附性能，在低浓度砷去除方面具有优异的效率、高的解吸效率和令人满意的磁可回收性，与商业 Fe3O4 颗粒相比，这些性能非常有前景。
