Author(s)

Congrong Wu, Cong Li, Dongjin Leng, Daizong Cui^*

College of Life Science, Northeast Forestry University, Harbin, China.

In this study, novel core-shell SiO₂-coated iron nanoparticles (SiO₂-nZVI) were synthesized using a one-step Stoeber method. The Malachite green degradation abilities of the nanoparticles were investigated. The effects of ethanol/distilled water volume ratio, presence and absence of PEG, tetraethyl orthosilicate (TEOS) dosage, and hydrolysis time used in the nanoparticles preparation process were investigated. The results indicated that the SiO₂-coated iron nanoparticles had the highest reduction activity when the particles synthesized with ethanol/H₂O ratio of 2:1, PEG of 0.15 ml, TEOS of 0.5 ml and the reaction time was 4 h. The SiO₂-nZVI nanoparticles were characterized using Transmission Electron Microscopy (TEM), Energy Dispersive Spectrometry (EDS) and powder X-Ray Diffraction (XRD). The results showed that the average particles diameter of the SiO₂-nZVI was 20 - 30 nm. The thickness of the outside SiO₂ film is consistent and approximately 10 nm. The results indicated that the nanoparticles coated completely with a transparent SiO₂-film. Such nanoparticles could have wide applications in dye decolorization.

Nano Zero-Valent Iron Particles, SiO2-Coated, Surface Modified, Dye Decolorization

Wu, C. , Li, C. , Leng, D. and Cui, D. (2016) Factors Affecting the Reductive Properties of the Core-Shell SiO2-Coated Iron Nanoparticles. Advances in Chemical Engineering and Science, 6, 316-323. doi: 10.4236/aces.2016.64032.