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Preparation of magnetic mesoporous carbon nitride adsorbent and method for removing perfluorooctane compound in water

A technology of mesoporous carbon nitride and perfluorooctane, applied in the field of adsorption, can solve the problems of difficult recycling and reuse of powdered mesoporous carbon nitride, and achieve sustainable development, simple operation process and large specific surface area. Effect

Inactive Publication Date: 2013-06-26
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the powdery mesoporous carbon nitride after adsorption saturation is difficult to recover from water for reuse.

Method used

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  • Preparation of magnetic mesoporous carbon nitride adsorbent and method for removing perfluorooctane compound in water
  • Preparation of magnetic mesoporous carbon nitride adsorbent and method for removing perfluorooctane compound in water
  • Preparation of magnetic mesoporous carbon nitride adsorbent and method for removing perfluorooctane compound in water

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preparation example Construction

[0029] Preparation of mesoporous carbon nitride:

[0030] Weigh 0.5 g of SBA-15 and add it to 2.2 g of ethylenediamine and 5.4 g of carbon tetrachloride mixture, heat at reflux, then react at 90 °C for 6 h, and vacuum dry for 12 h; at a nitrogen flow rate of 50 mL / min At 3 °C / min, the temperature was raised to 400 °C, and kept at this temperature for 5 hours, the template was washed with 5wt% HF acid, filtered, washed several times with ethanol, and dried at 100 °C to obtain mesoporous carbon nitride;

[0031] Preparation of Magnetic Mesoporous Carbon Nitride Adsorbent:

Embodiment 1

[0033] Add ferrous ammonium sulfate and ferric ammonium sulfate with a molar ratio of 1:2 and 1.25 g of mesoporous carbon nitride to 100 mL of water to prepare a suspension, and ultrasonically disperse it evenly; transfer the above suspension to a constant temperature water bath In the process, under the conditions of nitrogen flow and water bath temperature of 50°C, the pH value of the mixed solution was adjusted to 10-12 with 8 mol / L ammonia water for chemical precipitation reaction; the obtained product was first washed with distilled water until neutral, and then washed with absolute ethanol Washed, and finally vacuum-dried at 60 °C for 24 h to obtain Fe x o y A magnetic mesoporous carbon nitride adsorbent with a mass ratio of 1:5 to mesoporous carbon nitride.

Embodiment 2

[0037] In Example 1, other conditions remain unchanged, when the mass of mesoporous carbon nitride is 1.0 mg, Fe x o y Magnetic mesoporous carbon nitride with a mass ratio of 1:4 to mesoporous carbon nitride; when the mass of mesoporous carbon nitride is 0.5 mg, Fe x o y Magnetic mesoporous carbon nitride with a mass ratio of 1:2 to mesoporous carbon nitride.

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Abstract

The invention discloses a preparation method of a magnetic mesoporous carbon nitride adsorbent and a method for removing perfluorooctane compounds in water. The method comprises the following steps of: based on mesoporous carbon nitride as a matrix, and ammonium ferrous sulfate and ammonium ferric sulfate as an iron source, adjusting the alkaline environment of the liquid by ammonia water; and performing co-precipitin reaction in water bath condition. The saturation magnetization of the magnetic mesoporous carbon nitride prepared is 6.37emu / g. The magnetic mesoporous carbon nitride is used for removing perfluorooctane compounds [PFOS (Perfluorooctane sulfonates)] and [PFOA (Perfluorooctanoic acid)] in water, so that a good removal effect is obtained and adsorption equilibrium is quickly realized. Meanwhile, the magnetic mesoporous carbon nitride adsorbent provided by the invention can be recovered by additionally applying a magnetic field to the benefit of repeated use. The adsorbent provided by the invention has an important meaning for adsorption removal of perfluorooctane compounds, and has a good application prospect in wastewater treatment.

Description

technical field [0001] The invention relates to an adsorption technology in the field of environmental protection. Specifically, a magnetic mesoporous carbon nitride adsorbent is prepared by a chemical co-precipitation method, and the adsorbent is used to adsorb perfluorooctane compounds in water, and the saturated adsorbent passes through Apply an external magnetic field for separation and recycling. Background technique [0002] Perfluorooctane compounds, such as perfluorooctane sulfonic acid (PFOS) and perfluorooctanoic acid (PFOA), have excellent hydrophobicity and oleophobicity, good thermal and chemical stability and compatibility, and are widely used It is widely used in industrial and agricultural production and daily life. The extensive application of perfluorooctane compounds makes them enter water bodies in various ways. Perfluorooctane compounds are very stable in the environment, have high bioaccumulation, and have various toxic effects such as organ toxicity,...

Claims

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Application Information

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IPC IPC(8): B01J20/20B01J20/28B01J20/30C02F1/28C02F101/36
Inventor 江芳闫婷婷陈欢许晨敏
Owner NANJING UNIV OF SCI & TECH
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