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Method for preparing heavy metal adsorbent by carbonizing lakebed sludge

A technology of adsorbent and heavy metal, which is applied in the field of resource utilization of lake sediment to achieve the effect of improving performance, good activation effect and good adsorption effect.

Inactive Publication Date: 2010-06-02
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Lake sediment contains a large amount of carbon-containing organic matter, which provides certain prerequisites for the preparation of adsorbents by carbonization. At present, there are few reports on the preparation of adsorbents from lake sediments at home and abroad.

Method used

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  • Method for preparing heavy metal adsorbent by carbonizing lakebed sludge
  • Method for preparing heavy metal adsorbent by carbonizing lakebed sludge

Examples

Experimental program
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Effect test

Embodiment 1

[0041] Retrieve the sediment of the lake sediment, pour out the supernatant, wash 3 times with distilled water, pre-dehydrate it at room temperature for 8h, then dry it at 105℃ for 12h, then grind it, pass through a 60 mesh sieve, and take the lower fraction Add 20g of lake bottom mud to 60g of phosphoric acid solution with a concentration of 5mol / L, heat it in a 60℃ water bath for 12 hours, pour the upper layer of liquid, and put it in an oven at 105℃ for 24 hours, take it out and put it into the quartz in a high-temperature furnace In the tube reactor, the flow rate is 80mL / min CO 2 In the atmosphere, pyrolyze and carbonize at a temperature of 500°C for 60 minutes. The pyrolysis carbonized product is first washed with 3mol / L HCl solution many times to remove impurities in the carbonized product, and then rinsed with deionized water above 70°C until the pH of the water is greater than 6, and then dried at 105°C for 24h, and cooled After grinding and passing through a 60-mesh s...

Embodiment 2

[0043] Retrieve the sediment of the lake sediment, pour out the supernatant, wash it 3 times with distilled water, pre-dehydrate it at room temperature for 8 hours, then dry it at 105°C for 12 hours, then grind it, pass through a 60 mesh sieve, and take the lower fraction Add 20g of lake bottom mud to 80g phosphoric acid solution with a concentration of 5mol / L, heat it in a 60℃ water bath for 12 hours, pour the upper layer of liquid, and then put it in an oven at 105℃ to dry for 24 hours, take it out and put it into the quartz in a high-temperature furnace In the tube reactor, the flow rate is 80mL / min CO 2 In the atmosphere, pyrolyze and carbonize at 600°C for 60 minutes. The pyrolysis carbonized product is first washed with 3mol / L HCl solution for many times to remove impurities in the carbonized product, and then rinsed with deionized water above 70°C until the pH of the water is greater than 6, and then dried at 105°C for 24h, and cooled After grinding and passing through a...

Embodiment 3

[0045] Retrieve the sediment of the lake sediment, pour off the supernatant, wash 3 times with distilled water, pre-dehydrate it at room temperature for 8h, then dry it at 105℃ for 12h, then grind it, pass through a 60 mesh sieve, and take the lower fraction Add 20g of lake bottom mud to 100g of phosphoric acid solution with a concentration of 5mol / L, heat it in a 60℃ water bath for 12 hours, pour the upper layer of liquid, and put it in an oven at 105℃ to dry for 24 hours, take it out and put it into the quartz in a high-temperature furnace In the tube reactor, the flow rate is 80mL / min CO 2 In the atmosphere, pyrolyze and carbonize at 700°C for 60 minutes. The pyrolysis carbonized product is first washed with 3mol / L HCl solution for many times to remove impurities in the carbonized product, and then rinsed with deionized water above 70°C until the pH of the water is greater than 6, and then dried at 105°C for 24h, and cooled After grinding and passing through a 60-mesh sieve,...

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Abstract

The invention discloses a method for preparing heavy metal adsorbent by carbonizing lakebed sludge, which comprises the steps of: washing the lakebed sludge with distilled water and drying, adding phosphoric acid solution (activator) and heating by means of water bath, drying, putting into a quartz tube of a high-temperature furnace, flowing with CO2 to carbonize by means of pyrolyzation to obtain adsorbent. The method takes the phosphoric acid with low price as chemical activator, thereby reducing cost; combines a physical activation method with a chemical activation method, thereby having good activation effect, improving the performance of adsorbent, having good absorption effect, and having iodine absorption value which is larger than 350mg / g; and completely uses organic matters in the lakebed sludge, thereby providing an approach for disposing the lakebed sludge by means of stabilization and resource utilization.

Description

Technical field [0001] The present invention relates to the resource utilization of lake bottom mud, in particular to a method for preparing heavy metal adsorbents by using lake bottom peat. Background technique [0002] The electroplating, tanning, smelting and other industries discharge a large amount of heavy metal-containing wastewater every year. Treatment methods for wastewater containing heavy metals mainly include ion exchange, air flotation, chemical precipitation, electrolysis, and adsorption. Among them, the wastewater treated by the adsorption method can meet the discharge standard, the amount of excess sludge produced is small, and the adsorbed heavy metals can be recycled through desorption, so it is considered to be a more effective method. The adsorbent used in this method is generally activated carbon material with strong adsorption capacity, but the price is relatively expensive. [0003] On the other hand, in recent years, with the development of industry and a...

Claims

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Application Information

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IPC IPC(8): B01J20/20B01J20/30C02F1/28C02F101/20
Inventor 赵健蓉杨月红任治忠李迎刘梦雪付廷栋舒敦涛
Owner KUNMING UNIV OF SCI & TECH
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