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Phosphorous removal adsorbent and preparation method thereof

A phosphorus adsorbent and pore-forming agent technology, applied in the field of waste recycling, can solve the problems of slow adsorption rate and small adsorption capacity

Inactive Publication Date: 2019-08-27
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to provide a phosphorus removal adsorbent and its preparation method. The phosphorus removal adsorbent provided by the invention can solve the problems of small adsorption capacity and slow adsorption rate of existing phosphorus removal adsorbents

Method used

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preparation example Construction

[0021] The invention provides a kind of preparation method of phosphorus removal adsorbent, comprises the following steps:

[0022] (1) Reflux the red mud in an acid solution to obtain acid-activated red mud;

[0023] (2) immersing the acid-activated red mud in a modifier and performing modification treatment to obtain modified red mud; the modifier is a surfactant, an oxidizing agent or a sodium carbonate solution;

[0024] (3) mixing the modified red mud with a rare earth solution, adjusting the pH value to 8-10, and loading the rare earth ions to obtain the red mud loaded with rare earth;

[0025] (4) Mix and granulate the rare earth-loaded red mud, pore-forming agent and binder, and obtain a phosphorus-removing adsorbent after roasting.

[0026] In the invention, the red mud is refluxed in an acid solution for acid activation to obtain the acid-activated red mud.

[0027] The present invention has no special requirements on the source of the red mud, and any source of re...

Embodiment 1

[0046] A preparation method of phosphorus removal adsorbent, the preparation method is as follows:

[0047] (1) Reflux red mud in hydrochloric acid with a concentration of 6 mol / L at a liquid-solid ratio of 5 mL / g for 1 hour, suction filter, oven-dry at 105°C, grind, and sieve with 100 mesh to obtain acid-activated red mud ;

[0048] (2) The acid-activated red mud is then immersed in 8g / L cetyltrimethylammonium bromide at a solid-to-liquid ratio of 1g:50mL, stirred at room temperature for 2 hours, filtered, rinsed with deionized water, and modified After red mud;

[0049] (3) Next, add the modified red mud to the 0.25g / L lanthanum nitrate solution at a liquid-solid ratio of 5mL / g, add sodium hydroxide to adjust the pH to 8-10, react at room temperature for 16 hours, and filter to obtain the loaded red mud of lanthanum;

[0050] (4) Mix the red mud loaded with lanthanum according to the mass ratio of red mud: rice husk powder: hydroxypropyl methylcellulose = 71:22:7, use a p...

Embodiment 2

[0053] A preparation method of phosphorus removal adsorbent, the preparation method is as follows:

[0054] (1) Reflux the red mud in 20% oxalic acid with a solid-to-liquid ratio of 6 mL / g for 2 hours, suction filter, oven-dry at 105°C, grind, and sieve with 60 meshes to obtain acid-activated red mud;

[0055] (2) Add hydrogen peroxide with a mass fraction of 15% at a liquid-solid ratio of 10 mL / g, stir in the reactor at a constant speed for 2 hours, rinse with deionized water until neutral, and suction filter to obtain modified red mud;

[0056] (3) Add the modified red mud to a 0.4 g / L cerium sulfate solution at a liquid-solid ratio of 5 mL / g, add sodium hydroxide to adjust the pH to 8-10, react at room temperature for 12 hours, and filter to obtain red mud loaded with cerium ;

[0057] (4) Mix the cerium-loaded red mud according to the mass ratio of red mud: rice straw powder: bentonite = 88:6:6, use a perforated plate to make 3nm square particles, and bake them in a muffl...

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Abstract

The invention belongs to the field of waste recycling. The invention provides a preparation method of a phosphorous removal adsorbent. The preparation method comprises the following steps: (1) puttingred mud in an acid solution for backflow so as to obtain red mud after acid activation; (2) soaking the red mud after acid activation into a surface active agent, oxidant or sodium carbonate solution, and carrying out modified treatment to obtain modified red mud; (3) mixing the modified red mud with a rare earth solution, adjusting pH value to be 8 to 10, and loading rare earth ions to obtain red mud loaded with rare earth; and (4) carrying out mixing granulation on the red mud loaded with rare earth, a pore forming material and a binder, and carrying out calcinations to obtain the phosphorous removal adsorbent. The removal rate of the phosphorous removal adsorbent prepared in the invention is more than 95% and can reach 100% at most, the adsorption capacity can reach more than 240 mg / g,phosphorous-containing waste water with the concentration of below 30 mg / L is treated, and the concentration of phosphorous can reach the first grade emission standard of pollution discharge standardin a municipal sewage treatment plant within one hour.

Description

technical field [0001] The invention relates to the technical field of waste recycling, in particular to a phosphorus removal adsorbent and a preparation method thereof. Background technique [0002] Nowadays, water eutrophication has become an important water environment problem of surface water bodies such as rivers, lakes and reservoirs around the world. Excessive phosphorus is one of the main factors causing eutrophication of water bodies. It can also be known from the 2017 China Ecological Environment Status Bulletin that total phosphorus is the main pollution indicator in most polluted water bodies. Therefore, how to reduce the concentration of phosphorus nutrients in water becomes one of the keys to control the eutrophication of water. [0003] The traditional phosphorus removal methods mainly include biological method, chemical precipitation method, adsorption method and ion exchange method, and the newer technologies mainly include electrodialysis and reverse osmos...

Claims

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Application Information

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IPC IPC(8): B01J20/02C02F1/28B01J20/30C02F101/10
CPCB01J20/02C02F1/281C02F2101/105B01J2220/4887
Inventor 李彬陈彩珠宁平王婕刘宇周越
Owner KUNMING UNIV OF SCI & TECH
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