Morphology, Surface Layer Evolution, and-Structure Dye Adsorption Relationship of Porous Fe3O4 MNPs Prepared by Solvothermal/Gas Generation Process

作者：Mou, Yuanchun; Yang, Hu^*; Xu, Zhenliang

来源：ACS Sustainable Chemistry and Engineering, 2017, 5(3): 2339-2349.

DOI：10.1021/acssuschemeng.6b02670

• Nanoparticles
• Self-assembly
• Morphology evolution
• Adsorption
• Surface modification

A new system based on dimethylacetamide, ethanolamine, and azobis(isobutyronitrile) (AIBN) was employed to synthesize porous Fe3O4 magnetic nanoparticles (MNPs) for the first time. The formation mechanism, morphology, and surface layer evolution of MNPs at the different AIBN ratios were revealed. The MNPs prepared without AIBN showed a randomly assembled morphology with a BET surface area of 174 m(2)/g, which is almost the highest reported until now. After AIBN was added, N-2 gas and radical were produced by the thermal decomposition reaction. The high gas pressure enhanced the growth and self-assembly of nanounits, leading to a microsphere morphology. The radical caused a surface modification effect, which led to a decline in both the specific saturation magnetization and surface area of Fe3O4 MNPs. The surface of MNPs was fully modified when prepared at a high AIBN ratio. The methyl orange (MO) adsorption revealed that the modification coverage and surface composition of Fe(3)o(4) MNPs are responsible for its adsorption capacity irrespective of the surface area. The naked Fe3O4 MNPs showed a limited adsorption capacity, which was saturated during the synthesis process. Moreover, the prepared MNPs(3) showed a maximum adsorption capacity of 46.7 mg/g. The surface coverage ratio revealed that its surface was almost fully covered with dye molecules. Moreover, it has shown good acidic stability and can be regenerated for dye adsorption applications.

• 出版日期2017-3
• 单位华东理工大学