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Biomass modified adsorbent capable of adsorbing cadmium ions and preparation method and application thereof

A biomass and adsorbent technology, applied in chemical instruments and methods, adsorbed water/sewage treatment, other chemical processes, etc., can solve the problems of complex preparation methods and high cost of raw materials, and achieve simple and easy preparation methods, low cost, A wide range of effects

Inactive Publication Date: 2012-07-11
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the main disadvantages of this type of biomass adsorbent are: high cost of raw materials, complicated preparation methods, and the powdery state of the adsorbent, which cannot be directly used for static natural repairs such as adsorption towers.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Wash and dry the discarded peanut shells, crush them and sieve them, and take 0.85-2.00mm peanut shell particles; add 1.5-3L of potassium permanganate solution with a molar concentration of 0.05-0.1mol / L to 30g of the above-mentioned peanut shell particles. , stirred and reacted for 12-48 hours, taken out, washed with water until neutral, and dried at 50-80°C to obtain a biomass-modified adsorbent.

[0024] Weigh 28.26g of the adsorbent obtained above, evenly load it into the adsorption column, prepare cadmium-containing simulated wastewater with a concentration of 2mg / L, adjust the pH to 4.7~6.5, and pass the simulated cadmium ion wastewater through a peristaltic pump at a speed of 26.27mL / min The adsorption column is used to measure the concentration of cadmium ions in the effluent of the adsorption column at different times by atomic absorption chromatography. It has been tested that the minimum concentration of cadmium ions in the effluent of the adsorption column i...

Embodiment 2

[0026] Wash and dry the discarded peanut shells, crush them and sieve them, and take 0.85~2.00mm peanut shell particles; add 2~4L potassium permanganate solution with a molar concentration of 0.05~0.1mol / L to 40g of the above peanut shell particles, , stirred and reacted for 12-48 hours, taken out, washed with water until neutral, and dried at 50-80°C to obtain a biomass-modified adsorbent.

[0027] Weigh 37.68g of the adsorbent obtained above, evenly load it into the adsorption column, prepare cadmium-containing simulated wastewater with a concentration of 2mg / L, adjust the pH to 4.7~6.5, and pass the simulated cadmium ion wastewater through a peristaltic pump at a speed of 26.27mL / min The adsorption column is used to measure the concentration of cadmium ions in the effluent of the adsorption column at different times by atomic absorption chromatography. The minimum concentration of cadmium ions in the effluent of the adsorption column is determined to be lower than 0.001mg / L...

Embodiment 3

[0029] Wash and dry the discarded peanut shells, crush them and sieve them, and take 0.85~2.00mm peanut shell particles; add 2~4L potassium permanganate solution with a molar concentration of 0.05~0.1mol / L to 40g of the above peanut shell particles, , stirred and reacted for 12-48 hours, taken out, washed with water until neutral, and dried at 50-80°C to obtain a biomass-modified adsorbent.

[0030] Weigh 37.68g of the adsorbent obtained above, evenly load it into the adsorption column, prepare cadmium-containing simulated wastewater with a concentration of 11mg / L, adjust the pH to 4.7~6.5, and pass the simulated cadmium ion wastewater through a peristaltic pump at a speed of 26.27mL / min The adsorption column is used to measure the concentration of cadmium ions in the effluent of the adsorption column at different times by atomic absorption chromatography. The minimum concentration of cadmium ions in the effluent of the adsorption column is determined to be lower than 0.001mg / ...

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PUM

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Abstract

The invention discloses a biomass modified adsorbent capable of adsorbing cadmium ions and a preparation method and application thereof. The biomass adsorbent uses waste peanut shells as a raw material, and is prepared by modification of potassium permanganate. The preparation method comprises the following steps: the waste peanut shells are washed, dried, crushed and then are sieved, and then a potassium permanganate solution is added; the waste peanut shells and the potassium permanganate solution are reacted in stirring at room temperature, are washed to be neutral, and are dried to obtain the biomass modified adsorbent. The biomass modified adsorbent provided by the invention can be applied to adsorption treatment of low-concentration cadmium ions from wastewater. The biomass adsorbent provided by the invention is in a granulated shape, and can be directly applied to tower adsorption and natural water body in situ repair; and the used raw material is cheap and easy to obtain, the preparation method is simple, the cost is low, and the industrialization is easy.

Description

technical field [0001] The invention belongs to the field of modified adsorption materials, and relates to a biomass modified adsorbent, in particular to a biomass adsorbent for adsorbing cadmium ions and a preparation method and application thereof. Background technique [0002] Heavy metal pollution in water has become an increasingly serious environmental pollution problem. Traditional heavy metal wastewater treatment methods such as chemical precipitation, electrolysis, and ion exchange have disadvantages such as cumbersome operations and high operating costs when dealing with low-concentration heavy metal wastewater. Adsorption is one of the traditional heavy metal ion wastewater treatment methods. Although traditional adsorption materials represented by activated carbon and polymer resin have large adsorption capacity and fast adsorption rate, their service life is short and the regeneration cost is expensive. [0003] Agricultural and forestry wastes belong to a new...

Claims

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Application Information

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IPC IPC(8): B01J20/24B01J20/30C02F1/28C02F1/62
Inventor 龙腾林芳芳易筱筠党志
Owner SOUTH CHINA UNIV OF TECH
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