Method for preparing spherical carbon heavy metal adsorbent

A technology of adsorbent and spherical carbon, which is applied in chemical instruments and methods, adsorption water/sewage treatment, water/sludge/sewage treatment, etc. It can solve the impact of product adsorption performance, difficult control of reaction conditions, unfavorable commercial production, etc. problems, to achieve the effect of increasing market application prospects and economic benefits, low production costs, and abundant raw materials

Inactive Publication Date: 2014-05-21
NORTHEAST FORESTRY UNIVERSITY +1
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  • Application Information

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Problems solved by technology

[0013] In summary, the preparation of heavy metal adsorbents currently mainly uses biomass, carbon, organic matter, polymers, etc. One-step complex treatment process to obtain adsorbents with porous or surface-rich chelating functional groups. These methods usually require pretreatment of raw materials. The reaction conditions are difficult to control and have a great impact on the adsorption performance of the product. More than three steps of treatment are required, which increases the Reaction costs, and not conducive to large-scale commercial production

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  • Method for preparing spherical carbon heavy metal adsorbent

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Embodiment 1

[0026] Prepare the extracted pentosan into an aqueous solution with a concentration of 2%, put it into the reaction kettle with polytetrafluoroethylene, ensure that the volume of the solution and the volume of the kettle are 6:7, and raise the temperature to the target temperature of 210℃ at a heating rate of 10°C / min. Keep the temperature for 12 hours, cool down to room temperature, and centrifuge twice at 6000r / min to obtain a brown solid product. Washed twice with distilled water and absolute ethanol successively, and dried in vacuum for 10 hours to obtain the target product. figure 1 ).

[0027] Prepare Pb with a concentration of 2000mg / L 2+ and Cd 2+Solution, diluted to 100~1000mg / L respectively, take 0.015g of spherical carbon adsorbent in Example 1 and disperse in the Erlenmeyer flask containing 100ml of the above solution whose concentration is V, and vibrate in a constant temperature water bath at 30°C for 48 hours to reach adsorption equilibrium , use a membrane w...

Embodiment 2

[0029] The extracted pentosan was formulated into an aqueous solution with a concentration of 8%, and put into a polytetrafluoroethylene in a reaction kettle to ensure that the volume of the solution and the volume of the kettle were 9:10, and the temperature was raised to the target temperature of 250°C at a heating rate of 10°C / min. Keep the temperature for 9 hours, cool down to room temperature, and centrifuge twice at 10,000 r / min to obtain a brown solid product. Wash with distilled water and absolute ethanol three times successively, and vacuum-dry for 10 hours to obtain the target product, the surface contains 36.5 carboxyl functional groups, and the particle size distribution is 200-1200nm.

[0030] Prepare 2000mg / L of Pb 2+ and Cd 2+ Solution, respectively diluted to 100 ~ 1000mg / L, take example 2 carbon ball 0.015g and disperse in the Erlenmeyer flask containing 100ml of the above solution with a concentration of V, shake in a constant temperature water bath at 30 de...

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Abstract

The invention relates to a method for preparing a spherical carbon heavy metal adsorbent. The method is characterized by taking pentosan extracted by a bleached hardwood pulp alkaline method as a raw material and pure water as a solvent, and comprising the steps of after treatment at high temperature and high pressure under a hydrothermal condition, centrifugally separating so as to obtain a dark brown solid product, namely carbon spheres rich in acid oxygen-containing functional groups, washing the dark brown solid product for many times by distilled water and absolute ethyl alcohol till filtrate is clear, and drying in vacuum so as to obtain the spherical carbon heavy metal adsorbent. The method has the main characteristics that the pentosan extracted from a byproduct of pulping and papermaking is taken as the raw material and is environmentally friendly, cheap and easily available, water is taken as the solvent, the reaction needs no modifier and further oxidation, the adsorbent containing a large quantity of hydroxyl and carboxyl oxygen-containing functional groups is formed through dehydration, condensation, aromatization and carbonization, the adsorbent and metal ions can have chelation, and the adsorbent can be used as high performance adsorbent for adsorbing heavy metal ions like Pb(II) and Cd(II).The hydrothermal reaction adopted in the method has a simple operation process and the adsorbent is low in cost and has an excellent adsorbing effect.

Description

Technical field: [0001] The invention relates to the field of nanomaterial preparation, in particular to a method for preparing a heavy metal spherical carbon adsorbent. Background technique: [0002] Water pollution caused by heavy metal ions is a serious environmental problem facing the world. Chromium, nickel, cadmium and lead are the main heavy metal ions that cause water pollution. Among them, cadmium and lead usually have the highest content and are the most harmful to human health. According to the World Health Organization standard, the maximum content of cadmium and lead in drinking water should not be higher than 0.003 and 0.01mg / g. The current methods for removing heavy metal ions mainly include membrane separation, acid-base neutralization, sedimentation and other methods, but the high cost, long cycle and difficult control of the reaction limit its wide commercial application. Carbonaceous material adsorption can overcome the above disadvantages and is an ideal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/22B01J20/30C02F1/28C02F1/62
Inventor 刘守新李伟吴琼刘丽华张双双
Owner NORTHEAST FORESTRY UNIVERSITY
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