Rice husk cellulose adsorbent, and preparation method and application thereof

An adsorbent and cellulose technology, which is applied in the field of rice husk cellulose adsorbent and its preparation and application, can solve the problems of wasting resources and not being able to give full play to the performance of rice husk, and achieve no energy consumption, abundant raw materials, and reduced processing costs Effect

Active Publication Date: 2015-12-23
LIAONING UNIVERSITY
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  • Abstract
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  • Claims
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Problems solved by technology

These can not give full play to the per

Method used

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  • Rice husk cellulose adsorbent, and preparation method and application thereof
  • Rice husk cellulose adsorbent, and preparation method and application thereof
  • Rice husk cellulose adsorbent, and preparation method and application thereof

Examples

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Example Embodiment

[0024] Example 1 A rice husk cellulose adsorbent

[0025] Take 100g of raw rice husk (RH), wash it with deionized water, put it in a constant temperature drying oven, dry at 50°C for 12 hours, take it out, pulverize it to a powdery state, and set it aside. Take 20g of rice husk powder and slowly add 80mL of 17.4mol / L sulfuric acid, heat in a water bath, control the temperature at about 80℃, and acidify for 24h. Use 250mL of acidified rice husk powder with a concentration of 0.2mol·L -1 Wash with sodium bicarbonate, then wash with deionized water to neutrality, filter, dry at 60°C for 24 hours, grind and sieve, and select an adsorbent with a particle size of 100-150 μm, which is denoted as ORH. The yield is about 73.15%.

[0026] The infrared spectrum of the obtained rice husk cellulose adsorbent is as figure 1 As shown, located at 3700–3100cm -1 The hydroxyl stretching vibration peak at the position is obviously weakened, located at 2950cm -1 And 1300–1550cm -1 The methylmethylene...

Example Embodiment

[0030] Example 2 The effect of different acidity and other coexisting ions on gallium adsorption

[0031] Take 10ml of solutions containing Ga20ppm, Al20ppm, Fe20ppm and As20ppm respectively, and adjust the pH of the solution to pH equal to 1, 3, and [H + ] Is 1mol·L -1 And 4mol·L -1 Then, 10 mg of the rice husk cellulose adsorbent prepared in Example 1 was added separately, and after shaking for 24 hours, the concentration of each ion in the solution was measured. The result is figure 2 Shown from figure 2 It can be seen that in the entire acidity range, the adsorbent has a very low adsorption rate for aluminum, iron, and arsenic ions, while the adsorption rate for gallium solution can reach more than 72% at pH=3. It is shown that the rice husk cellulose adsorbent of the present invention has high efficiency and selective adsorption of gallium in a solution containing aluminum, iron, and gallium.

Example Embodiment

[0032] Example 3 Application of sulfuric acid modified rice husk cellulose adsorbent to separation and enrichment of gallium

[0033] Take a 50mol / L gallium solution, adjust the pH of the solution to pH=3, add 50mg of sulfuric acid-modified rice husk adsorbent to 50ml containing dilute element gallium solution, shake for 24 hours, adsorb dilute element gallium in the solution, and filter 1mol·L for the back-loaded gallium adsorbent -1 The hydrochloric acid solution was analyzed, and the calculated recovery rate was 96%.

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Abstract

The invention discloses a rice husk cellulose adsorbent, and a preparation method and the application of the rice husk cellulose adsorbent. The technical scheme adopted by the preparation method comprises the steps of taking rice husks; putting the rice husks in a constant-temperature drying box after washing the rice husks by deionized water; drying under 40 to 60 DEG C; taking out the rice husks and smashing the rice husks into powder; treating rice husk powder by slowly adding the rice husk powder in concentrated sulfuric acid; carrying out water-bath heating treatment; washing acidized rice husk powder by sodium bicarbonate; washing the powder to be neutral by the deionized water; filtering; carrying out constant-temperature drying under 40 to 70 DEG C; grinding the powder until the grain diameter is 100 to 150 mum. The rice husk cellulose adsorbent, and the preparation method and the application of the rice husk cellulose adsorbent, disclosed by the invention, have the advantages that a functionalized adsorbent is prepared by modifying the rice husks by sulfuric acid, gallium can be adsorbed from gallium-contained solution, low cost is realized, waste is changed into wealth, the adsorption amount is large, and the like.

Description

technical field [0001] The invention is applied in the technical field of effective extraction of rare precious metals and preparation of green adsorbents, relates to a simple modified rice husk adsorbent, and aims at selectively recovering gallium from a solution containing gallium ions and impurity metal ions. Background technique [0002] Scattered elements include gallium, indium, thallium, germanium, selenium, tellurium, rhenium. It was first used in the field of metallurgy, and now it is widely used in various high-tech fields. Gallium, known as "the new grain of semiconductor materials", is a typical scattered metal, and its content in the earth's crust accounts for about 1.5 / 10,000. my country's reserves of gallium metal account for about 80% to 85% of the world's reserves, and the total reserves rank first in the world. Gallium is a silver-white metal with a melting point of 29.8°C. It melts in the hand, but has a high boiling point. It has the longest liquid rang...

Claims

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Application Information

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IPC IPC(8): B01J20/24B01J20/30B01D15/08
Inventor 熊英王越娄振宁单炜军
Owner LIAONING UNIVERSITY
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