4.7. Removal of methylene blue dye by metal-organic framework (NiFe2O4)@SiO2@ HKUST-1 with different percentages.
To remove methylene blue dye as an environmental contaminant from dyeing wastewater, Methylene blue aqueous solution (10 mg/L) was first prepared then take 100 ml of it as a sample and add 0.1 gr of (NiFe2O4)@SiO2@HKUST-1 NiFe2O4@SiO2 degradation by 30, 50% wt. to the colored solution and also add 1 ml of oxygenated water (H2O2) and subjected to ultrasonication for complete mixing. Then every 10 minutes the sample was taken and centrifuged and finally, using a spectrophotometer, they obtained their wavelengths. by using the resulting wavelengths, the values of the removal of any of the metal organic frameworks can be calculated over time.
Fig (19): Diagram of methylene blue dye removal using nanocomposites with different percentages of nickel ferrite in a silica substrate
As can be seen in Fig (19), the synthesized 30% NiFe2O4@SiO2)@HKUST-1 nanocomposite had the highest removal in a shorter time than the 50% by weight metal-organic framework nanocomposite. As a result, within 60 minutes approximately 98% of dye removal was observed. For this reason, the magnetic metal-organic framework nanocomposite 30% NiFe2O4@SiO2@HKUST-1 was used in different conditions.