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Preparation method of special modified active carbon for removing mercury

An activated carbon and modification technology, which is applied in the field of preparing modified activated carbon for efficient mercury removal, can solve the problems of complex process, high cost, and high cost of use, and achieve the effect of simple operation process, high mercury removal performance, and low cost

Active Publication Date: 2013-07-31
RES INST OF FORESTRY NEW TECH CHINESE ACAD OF FORESTRY
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  • Summary
  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the application of activated carbon in mercury removal, the removal efficiency of mercury needs to be improved, and most of them focus on doping sulfur, the process is relatively complicated, the cost is high, and the cost of use is also high

Method used

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  • Preparation method of special modified active carbon for removing mercury
  • Preparation method of special modified active carbon for removing mercury
  • Preparation method of special modified active carbon for removing mercury

Examples

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preparation example Construction

[0018] A method for preparing modified activated carbon specially used for high-efficiency mercury removal, the specific steps are as follows:

[0019] Wooden granular activated carbon (coconut shell activated carbon) was pickled with hydrochloric acid and washed with distilled water, and then dried at 105°C for later use. Accurately weigh a certain amount of activated carbon, add a certain concentration of hydrogen peroxide according to different volume and mass ratios (hydrogen peroxide volume: mass of activated carbon), heat at 50-70°C for 2-4h, and then ultrasonic for 20-40min, with an ultrasonic frequency of 25 ~40Hz, ultrasonic power 80~100KWH. After standing still for 24 hours, it was filtered and then dried at 105°C. The sample obtained by drying was washed with deionized water until neutral, and dried at 105°C for 4 hours to obtain a modified activated carbon specially used for mercury removal. The modified activated carbon for mercury removal has high mercury remov...

Embodiment 1

[0021] Wooden granular activated carbon was pickled with hydrochloric acid and washed with distilled water, and then dried at 105°C for later use. Accurately weigh 6.0g of granular activated carbon, add 10ml of 30% hydrogen peroxide, heat at 70°C for 2h in an airtight state, then sonicate for 40min, let stand for 24 hours, filter and dry at 105°C. The dried sample was washed several times with deionized water until neutral, and dried at 105°C for 4 hours to prepare a modified activated carbon specially used for mercury removal. At 25°C, for HgCl with a concentration of 17.46mg / L 2 The adsorption experiment shows that the mercury removal efficiency is 83.9%, and the mercury adsorption amount is 4.88mg / g.

Embodiment 2

[0023] Wooden granular activated carbon was pickled with hydrochloric acid and washed with distilled water, and then dried at 105°C for later use. Accurately weigh 6.0g of granular activated carbon, add 10ml of 30% hydrogen peroxide, heat at 70°C for 4h in a closed state, then sonicate for 40min, let stand for 24 hours, filter and dry at 105°C. The dried sample was washed several times with deionized water until neutral, and dried at 105°C for 4 hours to prepare a modified activated carbon specially used for mercury removal. At 25°C, for HgCl with a concentration of 17.46mg / L 2 The adsorption experiment shows that the mercury removal efficiency is 82.2%, and the mercury adsorption amount is 4.96mg / g.

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Abstract

The invention discloses a preparation method of special modified active carbon for removing mercury. The method comprises the following steps of: washing wooden particle active carbon through hydrochloric acid and distilled water, and then drying the washed wooden particle active carbon to standby; heating the active carbon and the hydrogen peroxide with the concentration being 25 to 30wt% at the temperature of 50 to 70 DEG C for 2 to 4h according to the mass-to-volume ratio of 6g:(15-10)ml, and then carrying out the ultrasonic treatment on the active carbon for 20 to 40min; and standing, filtering, drying, washing and drying the active carbon to obtain the special modified active carbon for removing the mercury. The special modified active carbon has high mercury removal efficiency, and the maximal mercury adsorption volume can reach 5.3mg / g and is 1.5 times that of unmodified active carbon.

Description

technical field [0001] The invention belongs to the technical field of application of carbonaceous materials, and mainly relates to a method for preparing modified activated carbon specially used for high-efficiency mercury removal. Background technique [0002] Mercury is a pollutant that is transmitted through the atmosphere, so its pollution has spread to every corner of the world. Mercury pollution has become another global environmental problem after climate change. Mercury pollution prevention needs and has caused more and more widespread s concern. The sources of mercury environmental pollution are mainly natural release and man-made. With the increasingly complex and frequent human social activities, anthropogenic sources have become very important, and coal burning and waste incineration have become the most important sources of mercury pollution emissions. According to statistics, the emission of mercury in flue gas in the United States is as high as 158t / a each ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/30B01D53/02
Inventor 卢辛成蒋剑春孙康戴伟娣谢新平
Owner RES INST OF FORESTRY NEW TECH CHINESE ACAD OF FORESTRY
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