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Porous carbon material capable of selectively absorbing gold ions, preparation method and application of porous carbon material

A porous carbon material and gold ion technology, applied in the field of porous carbon, can solve the problems of poor selectivity and small adsorption capacity, and achieve the effects of low cost, simple preparation process and high specific surface area

Active Publication Date: 2013-01-30
苏州业华环境科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, general activated carbon has a small adsorption capacity for gold, and has poor selectivity to common metal ions such as copper, iron, nickel, tin, and lead in circuit boards.

Method used

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  • Porous carbon material capable of selectively absorbing gold ions, preparation method and application of porous carbon material
  • Porous carbon material capable of selectively absorbing gold ions, preparation method and application of porous carbon material
  • Porous carbon material capable of selectively absorbing gold ions, preparation method and application of porous carbon material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Example 1: Preparation and characterization of porous carbon materials at different carbonization temperatures

[0032] 1. Soak the banana peel of the domestic sesame banana in the pool and rinse it with running water. After rinsing the surface dirt, rinse it twice with distilled water. Then put it in a blast drying oven, bake at 80°C for 48 h, crush it with an electric grinder, and sieve it with a 100-mesh sieve to obtain banana peel powder.

[0033] 2. Carry out thermogravimetric performance analysis to the obtained banana peel powder, the thermogravimetric analysis of banana peel powder is as follows: figure 1 shown. from figure 1 It can be seen from the figure that 50-200°C is the water evaporation stage remaining in the banana peel; while in the temperature range of 200-700°C, it is the hemicellulose, cellulose, lignin and other polysaccharides and proteins in the banana peel. Wait for the splitting and decomposition stage of biomass; after 700°C, the biomass of...

Embodiment 2

[0042] Example 2: Testing of the adsorption performance of porous carbon materials prepared at 500°C on gold ions

[0043] 1. Prepare AuCl with a concentration of about 2, 3, 4, and 5mmol / L respectively 3 Solution, its accurate concentration is determined by atomic absorption spectrometry, and its test accuracy reaches 0.0001g.

[0044] 2. An analytical balance accurately weighed 0.0180 g of the porous carbon material prepared by carbonization at 500°C in Example 1, and put into 10 ml of the above-mentioned four kinds of AuCl with a pH value of 2.50 3 After stirring for 2 h at room temperature, the porous carbon material adsorbed with gold was filtered out and the gold content in the filtrate was measured, and the adsorption capacity and adsorption efficiency were calculated. The specific results are shown in Table 3. As can be seen from Table 3, with the AuCl in the solution 3 As the concentration increases, the adsorption capacity of porous carbon materials increases, when...

Embodiment 3

[0047] Example 3: Testing of adsorption properties of banana peel powder and porous carbon materials prepared by carbonization at 300°C and 700°C

[0048] An analytical balance accurately weighed 0.0180 g of banana peel powder and the porous carbon material prepared by carbonization at 300°C and 700°C in Example 1, and put in 10 ml of AuCl with a pH value of 2.50 and a concentration of 1354mg / L 3 solution, stirred at room temperature for 2 h, and then filtered out the porous carbon material adsorbed with gold. The gold content in the filtrate was determined by atomic absorption spectrometry to be 1120, 537, and 1270 mg / L, and the calculated adsorption capacity was 198.31 mg / L. , 692.37, 71.19 mg / g, and the adsorption efficiencies were 17.28%, 60.34%, and 6.20%, respectively.

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Abstract

The invention discloses a porous carbon material capable of selectively absorbing gold ions. The porous carbon material is prepared by the following method of, fully washing a banana peel, placing the banana peel in a drying oven to be dried for 48-80 hours at the temperature of 50-80 DEG C, smashing the banana peel by using an electric pulverizer, and screening the smashed banana peel by using a 100 mesh screen to obtain banana peel powders; and heating the banana peel powders in a tube furnace under a nitrogen atmosphere to the temperature of 300-500 DEGC, and carbonizing the banana peel powders for 1-5 hours to prepare the porous carbon material capable of selectively absorbing the gold ions. According to the porous carbon material capable of selectively absorbing the gold ions, the banana peel is used as a raw material, and the carbonization temperature is controlled to prepare porous carbon containing specific functional groups so that waste using is achieved, raw materials are rich, and costs are low; the preparation process is simple, the porous carbon material is used as an adsorbent for selectively absorbing gold, and the adsorption capacity is up to 800mg / g; and by means of simple elution, a solution containing the gold can be obtained, and the adsorbent can be recycled.

Description

technical field [0001] The present invention relates to a kind of utilization banana peel, preparation contains -OH, -NH 2 Porous carbon with equienergy complexed gold ion functional groups and high specific surface area, and its application to extract gold ions from waste electronic circuit boards. Background technique [0002] With the acceleration of the upgrading of household appliances, mobile phones and computers, etc., a large number of discarded electronic circuit boards are produced. The discarded electronic circuit boards are rich in metal resources, such as lead, tin, copper, iron, nickel, gold, palladium, etc., especially the content of precious metals such as gold, platinum, and palladium is 10-100 times higher than that in ore . Therefore, recycling metal resources from waste electronic circuit boards not only has good social benefits, but also has good economic benefits. In the actual process of recycling metal resources from waste electronic boards, since ...

Claims

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Application Information

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IPC IPC(8): B01J20/20B01J20/30C22B3/24C22B11/00
CPCY02P10/20
Inventor 郑华均王立敏
Owner 苏州业华环境科技有限公司
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