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Nano-level iron adsorbent for efficient dephosphorization

An adsorbent, nano-scale technology, applied in the field of water treatment, can solve the problems of high preparation conditions, toxic biological risks, etc., and achieve the effects of good dispersion effect, rapid and effective recovery, and strong phosphorus adsorption capacity.

Inactive Publication Date: 2010-08-18
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Chinese patent CN 101503217A discloses a carboxyl functionalized nano-Fe for phosphorus removal from wastewater 3 o 4 The preparation and application method of adsorbent are to utilize DTPA (diethylenetriaminepentaacetic acid) to modify nano-Fe 3 o 4 Although the adsorbent has a certain effect of phosphorus removal, its preparation conditions are relatively high and its modifier DTPA has certain toxicity and biological risks. Can a kind of efficient phosphorus removal and simple preparation be developed? , environmentally friendly adsorbent is the key of the present invention

Method used

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  • Nano-level iron adsorbent for efficient dephosphorization
  • Nano-level iron adsorbent for efficient dephosphorization
  • Nano-level iron adsorbent for efficient dephosphorization

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Effect test

Embodiment 1

[0014] Embodiment 1: the preparation of efficient phosphorus adsorbent

[0015] The stirring intensity is 1000s -1 Next, 100ml 0.1mol / L FeCl 2 4H 2 O solution was slowly poured into 100ml 1w / v% starch solution. Stir continuously for 30min, so that Fe 2+ Fully complexed with starch. Slowly add 0.1 mol / L NaOH solution dropwise to the solution until the pH>11, and continue to stir for 1 h to complete the reaction. After the reaction, the solid-liquid separation is carried out by using a magnet, and the adsorbent is repeatedly washed to neutrality with deionized water to remove excess electrolyte. Use after drying and grinding. The particle size is 10nm, and the saturation magnetization is 26.49emu / g.

Embodiment 2

[0016] The preparation of embodiment 2 efficient phosphorus adsorbent

[0017] The stirring intensity is 1000s -1 Next, 100ml 0.1mol / L FeCl 2 4H 2 The O solution was slowly poured into 100ml of 0.2w / v% starch solution. Stir continuously for 30min, so that Fe 2+ Fully complexed with starch. Slowly add 0.1 mol / L NaOH solution dropwise to the solution until the pH>11, and continue stirring for 1 h to complete the reaction. After the reaction, use a magnet for solid-liquid separation, and repeatedly rinse with deionized water until neutral to remove excess electrolyte. Dry and grind for later use. The particle size is 50nm, and the saturation magnetization is 26.78emu / g.

Embodiment 3

[0018] The preparation of embodiment 3 efficient phosphorus adsorbent

[0019] The stirring intensity is 1000s -1 Next, 100ml 0.1mol / L FeCl 2 4H 2 The O solution was slowly poured into 100ml of 0.02w / v% starch solution. Stir continuously for 30min, so that Fe 2+ Fully complexed with starch. Slowly add 0.1 mol / L NaOH solution dropwise to the solution until the pH>11, and continue to stir for 1 h to complete the reaction. After the reaction, use a magnet for solid-liquid separation, and repeatedly rinse with deionized water until neutral to remove excess electrolyte. Dry and grind for later use. The particle size is about 56nm, and the saturation magnetization is 36.18emu / g.

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Abstract

The invention belongs to the field of water treatment, and provides a nano-level iron adsorbent for efficient phosphorus absorption. In the invention, a soluble starch modified ferroferric oxide is adopted, under a certain stirring intensity, the soluble starch and ferrous ions are complexed, then strong base is added, and the monodisperse nano-ferroferric oxide adsorbent with uniform particle size is generated by oxidation. The nano level of the particle size of the adsorbent is controllable, and the adsorbent has higher phosphorus adsorbing capacity and certain magnetic property, and can realize effective solid-liquid separation under an applied magnetic field.

Description

technical field [0001] The invention belongs to the field of water treatment, in particular to a nanoscale iron adsorbent capable of efficiently adsorbing phosphorus. The adsorbent adopts soluble starch to modify ferric oxide to generate a uniform particle size and monodisperse nanometer ferric oxide oxidant. The particle size of the adsorbent is controllable at the nanometer level, has high phosphorus adsorption capacity, and has certain magnetism, and can realize effective solid-liquid separation under an external magnetic field. Background technique [0002] Phosphorus is one of the main elements that cause eutrophication in water bodies. Controlling phosphorus elements is more effective in controlling water body eutrophication than controlling nitrogen elements. In water bodies polluted by phosphorus, algae blooms in large numbers, dissolved oxygen drops sharply, and water quality becomes smelly. It affects the survival of aquatic organisms such as fish; phosphorus is a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/08C02F1/28C02F1/58
Inventor 潘纲丁程程
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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