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Preparation method of cocklebur shell-based biochar adsorbent and its application in the adsorption of radioactive radon

A technology of biochar and radioactivity, which is applied in the direction of radioactive purification, separation methods, chemical instruments and methods, etc., can solve the problems of single operation, complexity, high energy consumption, etc., and achieve rich micro-nano structure, excellent adsorption performance, high The effect of specific surface area

Active Publication Date: 2022-01-28
SOUTHWEAT UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Spray radon-proof coatings on building materials, floors or walls with high radon release rate to block the release of radon, but the long-term effectiveness of the seal cannot be guaranteed; by increasing the air circulation and diluting the indoor radon concentration, it can effectively Reduce the indoor radon concentration, but the energy consumption is high and the operation in the underground confined space is relatively large; activated carbon adsorption enrichment, fiber filtration purification technology, biological filtration technology, electrostatic dust removal technology, etc. can be used to reduce the indoor radon concentration. Among them, activated carbon adsorption enrichment is currently the most widely used and most effective method.
However, the performance of the currently used radon-removing activated carbon still does not meet the requirements, resulting in an overly large and complicated device, and the cost is relatively high

Method used

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  • Preparation method of cocklebur shell-based biochar adsorbent and its application in the adsorption of radioactive radon
  • Preparation method of cocklebur shell-based biochar adsorbent and its application in the adsorption of radioactive radon
  • Preparation method of cocklebur shell-based biochar adsorbent and its application in the adsorption of radioactive radon

Examples

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Embodiment 1

[0036] A preparation method of cocklebur fruit shell-based biochar material, comprising the following steps:

[0037] Step 1. Wash the cocklebur fruit shell to remove impurities, dry it in a blast drying oven at 100°C overnight, heat at 500°C for 1 hour under nitrogen protection, and cool naturally to obtain carbonized material;

[0038] Step 2. Fully stir and mix the carbonized material and the activator KOH at a weight ratio of 2:1, activate at 800°C for 2 hours under nitrogen protection, soak in 0.1mol / L dilute hydrochloric acid solution for 5 hours after natural cooling, filter, and then Wash with deionized water until the filtrate is neutral and dry to obtain cocklebur husk-based biochar material; in the process of immersing in dilute hydrochloric acid solution, use sealed pressurized ultrasound, and the process parameters are: every 10 minutes after ultrasonic reaction Stop ultrasound for 3 minutes, pressure 20MPa, frequency 300kHz;

[0039] figure 1 The SEM image of t...

Embodiment 2

[0044] A preparation method of cocklebur fruit shell-based biochar material, comprising the following steps:

[0045] Step 1. Wash the cocklebur fruit shell to remove impurities, dry it in a blast drying oven at 100°C overnight, heat at 500°C for 1 hour under nitrogen protection, and cool naturally to obtain carbonized material;

[0046] Step 2, the activator KOH and K 2 CO 3 After mixing at a weight ratio of 1:1, after fully stirring and mixing with the carbonized material at a weight ratio of 1:1, activate it at 850°C for 2 hours under nitrogen protection, and soak it in 0.1mol / L dilute hydrochloric acid solution for 5 hours after natural cooling. Filtrate, then wash with deionized water until the filtrate is neutral, and dry to obtain cocklebur husk-based biochar material; in the process of soaking with dilute hydrochloric acid solution, use sealed and pressurized ultrasound, and the process parameters are: After 15 minutes, the ultrasound was stopped for 5 minutes, the p...

Embodiment 3

[0048] A preparation method of cocklebur fruit shell-based biochar material, comprising the following steps:

[0049] Step 1. Wash the cocklebur fruit shell to remove impurities, dry it in a blast drying oven at 100°C overnight, heat at 500°C for 1 hour under nitrogen protection, and cool naturally to obtain carbonized material;

[0050] Step 2, the activator KOH and K 2 SiO 3 After mixing at a weight ratio of 1:1, after fully stirring and mixing with the carbonized material at a weight ratio of 2:1, activate it at 750°C for 2 hours under nitrogen protection, and soak it in 0.1mol / L dilute hydrochloric acid solution for 5 hours after natural cooling. Filtrate, then wash with deionized water until the filtrate is neutral, and dry to obtain cocklebur husk-based biochar material; in the process of soaking with dilute hydrochloric acid solution, use sealed and pressurized ultrasound, and the process parameters are: After 10 minutes, the ultrasound was stopped for 5 minutes, the ...

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Abstract

The invention discloses a preparation method of a cocklebur fruit shell-based biomass carbon adsorbent and its application in absorbing radioactive radon, comprising: cleaning the cocklebur fruit shell to remove impurities, and heating at 450-550°C under the protection of an inert gas Carbonize for 0.5-1.5 hours, and cool naturally to obtain carbonized material; after fully mixing the carbonized material and activator at a weight ratio of 1-10:1-3, activate it at 600-800°C for 1-3 hours under the protection of an inert gas, and then cool it naturally Soak in dilute hydrochloric acid solution for 4-6 hours, filter, then wash with deionized water until the filtrate is neutral, and dry to obtain cocklebur shell-based biomass carbon material. The cocklebur fruit shell-based biomass carbon adsorbent material prepared by the present invention has a relatively high specific surface area and rich micro-nano structure, and has excellent adsorption performance for radioactive and harmful radon gas. The regeneration of the adsorption performance can be realized.

Description

technical field [0001] The invention belongs to the field of biomass carbon adsorption materials and radioactive gas pollution treatment, and in particular relates to a preparation method of cocklebur fruit shell-based biomass carbon adsorbent and its application in adsorbing radioactive radon. Background technique [0002] Radon, the only gas with a half-life of 3.8235 days that is composed entirely of radioactive isotopes under normal conditions, is continuously released from uranium-containing minerals in rocks and soils. Underground positions and underground engineering, near-ground floors and basements in low concave areas of mountainous cities, mines and metallurgy, rocks, building materials, etc., tend to accumulate higher concentrations of radon gas, causing health hazards to employees. According to reports, in closed spaces such as underground mines or houses, the dose of ionizing radiation produced by radon gas accounts for about 52% of the dose of ionizing radiati...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/324C01B32/348B01J20/20B01J20/28B01J20/30B01J20/34G21F9/02B01D53/02
CPCC01B32/324C01B32/348B01J20/20B01J20/28066B01J20/2808B01J20/3441B01J20/3483G21F9/02B01D53/02B01J2220/485
Inventor 貟朝乐梁珺成周洋罗学刚李琛
Owner SOUTHWEAT UNIV OF SCI & TECH