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

Active Publication Date: 2013-12-11
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the unmodified diatomite raw material has poor adsorption performance and may contain associated impurities, which affects its application in dye wastewater treatment. Therefore, purification and modification are required to remove large amounts of diatomite. Part of the impurities and active substances, get a more abundant internal pore structure, increase its specific surface area, further improve the adsorption, and thus have stronger applicability in the field of water treatment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

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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Abstract

The invention discloses a magnetic kieselgur based absorbent, and a preparation method and an application thereof. 1 to 10 percent of hydrochloric acid solution is adopted for performing pretreatment on kieselgur firstly, suction filtration and drying is performed on the kieselgur, then physical pre-modification of the kieselgur is performed through a plasma, then a ferrous ion solution is adopted to soak the kieselgur for realizing modification, alkali is added for adjusting the pH value to generate a magnetic precursor, and then the magnetic kieselgur based absorbent is prepared through suction filtration, stoving, roasting and grinding. The modified kieselgur provided by the invention has remarkably improved adsorbability, has a favorable adsorbability to substances difficult to degrade, meanwhile has a greater magnetic property, can realize solid-liquid separation of treated wastewater conveniently, and enables the reutilization of the kieselgur to be more convenient.

Description

technical field [0001] The invention relates to a magnetic diatomite-based adsorbent, a preparation method and application thereof. Background technique [0002] Chemical industry is an important pillar industry in my country, of which fine chemical enterprises account for about 90%, which plays a decisive role in the development of my country's national economy. At the same time, the fine chemical industry is also a heavily polluting industry. The annual wastewater discharge is tens of billions of tons. [0003] After pre-treatment and biochemical treatment of fine chemical wastewater, the composition of biochemical tail water pollutants is still very complex. Facing the environmental protection pressure of industry standard upgrading and reclaimed water reuse, there is an urgent need for economical and effective advanced treatment technology. The water reuse rate of my country's fine chemical wastewater is low, and the technical level of advanced treatment and reuse wate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/14B01J20/28B01J20/30C02F1/28C02F101/38
CPCB01J20/14B01J20/02B01J20/28004B01J20/28009B01J20/3021B01J20/3078B01J20/3085C02F1/281C02F1/481
Inventor 徐炎华陈碧霄于鹏
Owner NANJING UNIV OF TECH
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