2.4. Synthesis of magnetic metal-organic framework nanocomposites NiFe2O4@SiO2@HKUST-1
The first step was dispersed 1 gr of nickel ferrite prepared in the previous step with 50 ml ethanol and then added 2 ml (AP) and allowed to reflow for 6 hours under reflux conditions at 80 °C for 6 h and the resulting sediment was separated using a magnet. The second step was re-dispersed the isolated nanoparticles with 30 ml of ethanol and then added 3 gr (GA) and re-mixed under reflux for 3 h at 40 °C. After the required time, the nanoparticles were collected and washed with distilled water. The third stage was poured 1 gr of the resulting second stage powder with 6.04 gr of copper nitrate and 4.72 gr of H3BTC ligand and 60 ml of distilled water in the balloon and again under reflux conditions at 100 °C for 8 hours and then stirred vigorously. From the wash, the precipitate was placed in a vacuum oven at 150 °C for 10 hours to dry the precipitate (Fig 3).
Fig 3: Schematic of Synthesis of magnetic metal-organic framework nanocomposites NiFe2O4@SiO2@HKUST-1
All synthesized magnetic metal-organic frameworks nanocomposites are presented in Table 1. Nickel ferrite nanocomposites embedded in silica substrate with weight ratios of SiO2 x (NiFe2O4)/(100-x) which (x = 10, 30 and 50 wt.%) was synthesized according to the synthesis method mentioned in Section 2-2. Then their magnetic metal-organic frameworks were synthesized and identified by the synthesis method mentioned in Section 2-4.
Table1: Introducing Sample Names.