Preparation of Mg-vermiculite nanoparticles using potassium persulfate treatment

作者：Matejka Vlastimil^*; Supova Kristkova Monika; Kratosova Gabriela; Valaskova Marta

来源：Journal of Nanoscience and Nanotechnology, 2006, 6(8): 2484-2488.

DOI：10.1166/jnn.2006.536

• Mg-vermiculite
• exfoliation
• potassium persulfate
• hydrogen peroxide
• XRPD
• SEM
• AFM

Delamination/exfoliation process of the Mg-vermiculite (Letovice, Czech Republic), particles with size less than 5 mu m, was studied after potassium persulfate treatment and compared with known method utilized hydrogen peroxide treatment. X-ray powder diffraction (XRPD) patterns showed that treatment of Mg-vermiculite with different molar concentration of potassium persulfate: c = 0.02, 0.04, and 0.08 mol . dm(-3) at the temperature 60 degrees C for 2 hr caused reduction of relative intensity (I-rel.) of the basal 001 diffraction to the 15%, 9%, and 4%, respectively, compared to intensity of 001 diffraction of untreated Mg-vermiculite (I-rel. = 100%). On the other hand I-rel. of the 001 diffraction of Mg-vermiculite after treatment with 30% and 50% (c = 9.8 and 17.4 mol.dm(-3)) hydrogen peroxide at the 60 degrees C for 2 hr decreased only to I-rel. = 36% and 32%, respectively. Atomic Force Microscopy (AFM) and Scanning Electron Microscopy (SEM) verified effect of potassium persulfate treatment on structure degradation which is connected with higher degree of delamination/exfoliation of the particles and their cracking into nano-sized particles.

• 出版日期2006-8