Abstract: The Ionic liquids (IL) 1-octyl-3-methylimidazole hexafluorophosphate ([OMIM]PF6) was selected from three ILs along with (1-butyl-3-methylimidazole hexafluorophosphate ([BMIM]PF6), 1-hexyl-3-methyl-imidazole hexafluoro-phosphate ([HMIM]PF6), were coated by Fe3O4@SiO2 nanoparticles with core-shell structure to prepare magnetic solid phase extraction agent (Fe3O4@SiO2@IL) and establish a new method of magnetic solid phase extraction (MSPE) coupled with Fluorescence spectrophotometry for separation/analysis of Rhodamine B. The results showed that Rhodamine B was adsorbed rapidly byFe3O4@SiO2@[OMIM]PF6 and eluted by ethanol. Under the optimal conditions the linear range, detection limit (DL), correlation coefficient (R) and relative standard deviation (RSD) were found to be 0.40-140.00 g L-1, 0.06g L-1, 0.9993 and 0.45% (n=3, c=10.00 µg L-1), respectively. The pre-concentration factor of the proposed method was 25-fold. The Fe3O4@SiO2 NPs can be used repeatedly for 10 times. This method has been applied to the determination of Rhodamine B in food samples.Abstract: The Ionic liquids (IL) 1-octyl-3-methylimidazole hexafluorophosphate ([OMIM]PF6) was selected from three ILs along with (1-butyl-3-methylimidazole hexafluorophosphate ([BMIM]PF6), 1-hexyl-3-methyl-imidazole hexafluoro-phosphate ([HMIM]PF6), were coated by Fe3O4@SiO2 nanoparticles with core-shell structure to prepare magnetic solid phase extraction ...Show More
Abstract: In this research, soluble sodium silicate was extracted from rice husk ash. Rice husk in its as-received state was initially burnt in an open air to obtain the rice husk ash (RHA), which was later thermally treated inside the muffle furnace at 600°C for 5hrs to remove the carbonaceous matter and increase the silica (SiO2) content. The thermally treated RHA was later mixed with 3M NaOH as soda source and heated with continuous stirring inside a heating glass vessel placed in a thermostatic water bath at 70°C for 4hrs, 80°C for 3hrs, and 90°C for 2hrs respectively. Physical analyses such as Viscosity, PH, Specific gravity, and Electrical conductivity were carried out on the extracted sodium silicate which was compared with the reference sodium silicate sample.Abstract: In this research, soluble sodium silicate was extracted from rice husk ash. Rice husk in its as-received state was initially burnt in an open air to obtain the rice husk ash (RHA), which was later thermally treated inside the muffle furnace at 600°C for 5hrs to remove the carbonaceous matter and increase the silica (SiO2) content. The thermally tre...Show More
