Magnetic kieselgur based adsorbent, and preparation method and application thereof
A diatomite and adsorbent technology, applied to magnetic diatomite-based adsorbent and its preparation and application fields, can solve the problems of containing accompanying impurities, poor adsorption performance, affecting application, etc., achieving easy recovery and reuse, ensuring Adsorption performance, loss reduction effect
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Embodiment 1
[0025] Preparation: (1) Mix 40g of diatomite raw soil with 400ml of 5% HCl solution (the solid-to-liquid ratio of diatomite mass to HCl solution volume is 1:10 (g / ml)), at a temperature of 100°C After heating for 1 hour, filter, dry in an oven, and grind until the average particle size of diatomaceous earth is 100-200 mesh. (2) Take 20g of the pretreated sample and carry out plasma physical modification in a double dielectric barrier plasma generator, the modification voltage is 10kV, the inert gas is argon, and the discharge time is 3min. (3) Take FeSO 4 ·7H 2 O5.49g, made into 100ml, 3% FeSO 4 solution, add 10g of diatomite (the solid-to-liquid ratio of the mass of diatomite to the volume of the modified solution is 1:10 (g / ml)), impregnate for 5 hours, add 5% NaOH to adjust the pH to 8, generate a magnetic precursor, and filter ; (4) The magnetic precursor was dried at 80°C for 3 hours, calcined at 500°C for 1 hour, and then ground to obtain a magnetic diatomite-based ad...
Embodiment 2
[0028] Preparation: (1) Mix 40g of diatomite raw soil with 800ml of 10% HCl solution (the solid-to-liquid ratio of the mass of diatomite to the volume of HCl solution is 1:20 (g / ml)), at a temperature of 80°C After heating for 2 hours, filter, dry in an oven, and grind until the average particle size of diatomaceous earth is 150-200 mesh. (2) Take 20g of the pretreated sample and carry out plasma physical modification in a double dielectric barrier plasma generator, the modification voltage is 20kV, the inert gas is neon gas, and the modification time is 10min. (3) Take 2g of FeCl 2 Make up 100ml, 2% FeCl 2 Solution, add 10g of diatomite (the solid-to-liquid ratio of the mass of diatomite to the volume of the modified solution is 1:10 (g / ml)) and soak for 12 hours, then add 10% KOH to adjust the pH to 11, generate a magnetic precursor, and filter; (3) The magnetic precursor was dried at 110°C for 5 hours, calcined at 800°C for 3 hours, and then ground to obtain a magnetic di...
Embodiment 3
[0031] Preparation: (1) Mix 40g of diatomite raw soil with 400ml of 6% HCl solution (the solid-to-liquid ratio of diatomite mass to HCl solution volume is 1:10 (g / ml)), at a temperature of 90°C After heating for 1.5 hours, filter, dry in an oven, and grind until the average particle size of diatomaceous earth is 100-150 mesh. (2) Take 20g of the pretreated sample and carry out plasma physical modification in a double dielectric barrier plasma generator, the modification voltage is 15kV, the inert gas is argon, and the modification time is 5min. (3) Add FeSO 4 ·7H 2 O1.83g, made into 100ml, 1% FeSO 4 solution, add 10g of diatomite (the solid-to-liquid ratio of the mass of diatomite to the volume of the modified solution is 1:10 (g / ml)) for 9 hours, add 8% NaOH to adjust the pH to 9, generate a magnetic precursor, and filter (4) The magnetic precursor was dried at 100°C for 4h, roasted at 600°C for 2h, and then ground to obtain a magnetic diatomite-based adsorbent with an ave...
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