A preparing method of a magnetic hydrogel microsphere
A technology of gel microspheres and magnetic water, applied in chemical instruments and methods, water pollutants, water/sewage treatment, etc., can solve problems such as difficult large-scale production, low adsorption rate, and low preparation efficiency, and achieve easy scale efficient production, easy separation, and improved adsorption efficiency
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Embodiment 1
[0021] (1) Ultrasonic dispersion of 0.5 g of graphite oxide prepared by the Hummers method in 100 mL of deionized water to obtain a GO dispersion with a concentration of 5 mg / mL. Then, under a nitrogen atmosphere, 1.5 g of iron salt (Fe 2+ and Fe 3+ The molar ratio is 1:2) and 0.2g NaOH solution for 30 min to get GO@Fe 3 o 4 The mixture was centrifuged and dried for use.
[0022] (2) Dissolve 5 g of CMC in 500 mL of distilled water at 60 °C, and then add 0.435 g of GO@Fe into it 3 o 4 and 0.2 g of citric acid, ultrasonically dispersed and magnetically stirred for 3 h, and then prepared GO@Fe by spray dryer 3 o 4 CMC composite microspheres with 8wt% content, marked as CMC / GO@Fe 3 o 4 . The parameters of the spray drying device are set to an inlet temperature of 150-160 °C, an injection volume of 600-800 mL / h, and an air flow rate of 80-90%. Finally, the obtained composite microspheres were dried in an oven at 90 °C for 5 h and then sealed for use.
[0023] In addit...
Embodiment 2
[0026] In Example 2, CMC / GO@Fe was prepared in the same manner as in Example 1 3 o 4 Composite hydrogel microspheres, the only difference is the GO@Fe composite microspheres in this example 3 o 4 The content is 2 wt%. The results showed that the adsorption capacity of the hydrogel microspheres in this example to hexavalent chromium ions was 9 mg / g at pH=4.
Embodiment 3
[0028] In Example 3, CMC / GO@Fe was prepared in the same manner as in Example 1 3 o 4 Composite hydrogel microspheres, the only difference is the GO@Fe composite microspheres in this example 3 o 4The content is 4 wt%. The results showed that the adsorption capacity of the hydrogel microspheres in this example to hexavalent chromium ions was 17 mg / g at pH=4.
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