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Carbon-based adsorbent for mercury removal as well as preparation method and application thereof

An adsorbent, carbon-based technology, applied in the field of materials, can solve the problems of poor mercury removal efficiency and high operating cost of adsorbents, and achieve the effects of broad specific surface area and active sites, good adsorption performance, and low environmental pollution.

Inactive Publication Date: 2020-06-09
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a carbon-based adsorbent for mercury removal and its preparation method and application in order to solve the above problems. The carbon-based adsorbent for mercury removal prepared by the present invention has the characteristics of large specific surface area and strong adsorption force. Effectively remove elemental mercury in power plant flue gas, and the mercury removal efficiency can reach more than 98% under laboratory conditions, which greatly improves the adsorption efficiency, which is significantly higher than the traditional activated carbon adsorbent. While improving the adsorption capacity of the material, it adopts Non-toxic and harmless raw materials from a wide range of sources to solve technical problems such as poor mercury removal efficiency and high operating costs of adsorbents in the prior art

Method used

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  • Carbon-based adsorbent for mercury removal as well as preparation method and application thereof
  • Carbon-based adsorbent for mercury removal as well as preparation method and application thereof
  • Carbon-based adsorbent for mercury removal as well as preparation method and application thereof

Examples

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Effect test

Embodiment 1

[0033] A carbon-based adsorbent for mercury removal, obtained by a preparation method comprising the following steps:

[0034] Preparation of graphite-phase carbon nitride: (1) Weigh 5 g of melamine at room temperature and place it in a cylindrical crucible, place the crucible in a muffle furnace, set the heating rate at 10°C / min to 500°C, and calcinate for 3 hours, After it was naturally cooled to room temperature, the crucible was taken out, and the bulk solid obtained by calcination was recorded as B, and B was fully ground in an agate mortar.

[0035] (2) Put B in a crucible, heat up to 500°C at a heating rate of 10°C / min, calcinate for 4 hours, and cool naturally to room temperature to obtain graphitic carbon nitride C. The specific surface area of ​​graphitic carbon nitride C is 110m 2 / g.

[0036] Modification of tricobalt tetroxide: (1) Weigh 1.5g cobalt nitrate hexahydrate and dissolve it in 10ml deionized water, put on a magnetic stirrer, weigh 3g graphite phase ca...

Embodiment 2

[0041] A carbon-based adsorbent for mercury removal, obtained by a preparation method comprising the following steps:

[0042] Preparation of graphite-phase carbon nitride: (1) Weigh 10 g of melamine at room temperature and place it in a cylindrical crucible, place the crucible in a muffle furnace, set the heating rate at 15°C / min to 600°C, and calcinate for 2 hours, After it was naturally cooled to room temperature, the crucible was taken out, and the bulk solid obtained by calcination was recorded as B, and B was fully ground in an agate mortar.

[0043] (2) Put B in a crucible, heat up to 600°C at a heating rate of 15°C / min, calcinate for 3 hours, and cool naturally to room temperature to obtain graphitic carbon nitride C.

[0044] Modification of tricobalt tetroxide: (1) take 2g cobalt nitrate hexahydrate and dissolve it in 15ml deionized water, put on a magnetic stirrer, weigh 6g graphite phase carbon nitride powder C while stirring, the stirring speed is 30r / min, stir T...

Embodiment 3

[0047] A carbon-based adsorbent for mercury removal, obtained by a preparation method comprising the following steps:

[0048] Preparation of graphite-phase carbon nitride: (1) Weigh 7 g of melamine at room temperature and place it in a cylindrical crucible, place the crucible in a muffle furnace, set the heating rate at 5°C / min to 400°C, and calcinate for 4 hours, After it was naturally cooled to room temperature, the crucible was taken out, and the bulk solid obtained by calcination was recorded as B, and B was fully ground in an agate mortar.

[0049] (2) Put B in a crucible, heat up to 400°C at a heating rate of 5°C / min, calcinate for 5 hours, and cool naturally to room temperature to obtain graphitic carbon nitride C.

[0050] Modification of tricobalt tetroxide: (1) Weigh 3.5g cobalt nitrate hexahydrate and dissolve it in 10ml deionized water, put on a magnetic stirrer, weigh 3.5g graphite phase carbon nitride powder C while stirring, and the stirring speed is 50r / min ,...

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Abstract

The invention relates to a carbon-based adsorbent for mercury removal as well as a preparation method and an application thereof, and the preparation method specifically comprises the following steps:(a) weighing melamine, heating and calcining melamine for the first time, cooling to room temperature, grinding, heating and calcining for the second time, and cooling to room temperature to obtain graphite-phase carbon nitride; (b) dissolving the graphite-phase carbon nitride and cobalt nitrate hexahydrate obtained in the step (a) in water, stirring until the graphite-phase carbon nitride and cobalt nitrate hexahydrate are completely dissolved to obtain a mixed solution, and drying the mixed solution to obtain a precursor; and (c) grinding the precursor obtained in the step (b), and carryingout third heating calcination to obtain the carbon-based adsorbent for mercury removal. Compared with the prior art, the carbon-based adsorbent for mercury removal has the characteristics of large specific surface area and strong adsorption capacity, can effectively remove elemental mercury in flue gas of a power plant, has mercury removal efficiency of 98% or above under laboratory conditions, greatly improves adsorption efficiency, and is obviously higher than traditional activated carbon adsorbents.

Description

technical field [0001] The invention relates to the field of materials, in particular to a carbon-based adsorbent for mercury removal and its preparation method and application. Background technique [0002] With the rapid development of industry and the rolling in of economic benefits, environmental pollution has become a major problem that cannot be ignored. Among them, mercury pollution has brought an indelible impact on the environment, followed by harm to human society, such as the "Minamata disease" incident that occurred in Minamata Bay, Kumamoto Prefecture, Kyushu, Japan in 1956. Coincidentally, in 1972, when Iraq used methylmercury and ethylmercury fungicides to treat seeds, malignant mercury poisoning occurred. After that, incidents of mercury pollution around the world followed one after another, which aroused worldwide attention. [0003] Mercury from coal combustion (including Hg in flue gas from thermal power plants p and Hg 2+ ) can be removed in the exist...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/30B01D53/02
CPCB01D53/02B01D2257/602B01J20/06B01J20/20
Inventor 吴江田玉琢张禛张钊鹏毛旭何平马昕霞
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER
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