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Absorbent for emergency treatment of indoor mercury leakage and preparation method thereof

The technology of an adsorbent and a treatment method is applied in the field of an adsorbent for mercury leakage in an emergency disposal room and its preparation field, which can solve problems such as mercury leakage and achieve the effect of excellent adsorption performance.

Active Publication Date: 2020-02-28
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Overcoming the problem of mercury leakage in emergency disposal rooms and the low Hg of ZnS in the process of combining ZnS with air purifiers 0 The problem of adsorption rate

Method used

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  • Absorbent for emergency treatment of indoor mercury leakage and preparation method thereof
  • Absorbent for emergency treatment of indoor mercury leakage and preparation method thereof
  • Absorbent for emergency treatment of indoor mercury leakage and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Example 1ZnS / TiO 2 Sorbent preparation

[0043] (1) Zinc nitrate solution is mixed with titanium dioxide, stirred for 3h, wherein, the mass ratio of the dosage of zinc nitrate and titanium dioxide is 1:5;

[0044] (2) Rotate the mixed solution obtained in step (1), dry the solid obtained by rotary evaporation, and then calcinate the solid at 500 ° C to obtain ZnO / TiO 2 Adsorbent;

[0045] (3) Get 250mg of ZnO / TiO prepared in step (2) 2 The adsorbent is placed in a fixed-bed reactor, and hydrogen sulfide is passed through at 300°C for 1 hour (flow rate 500mL / min) to obtain ZnS / TiO 2 Adsorbent, labeled as Adsorbent A.

Embodiment 2

[0057] Example 2 Adsorption of gaseous zero-valent mercury

[0058] Grinding and sieving the adsorbents A, B, C, and D prepared in Example 1 and Comparative Examples 1, 2, and 3, and taking 40-60 mesh particles to perform gaseous zero-valent mercury adsorption performance on a fixed-bed reactor Evaluation: The amount of adsorbents A, B, C, and D is 50 mg, and the simulated gas composition is: [Hg 0 ]=4350μgm -3 , nitrogen flow = 300mLmin -1 , airspeed=3.6×10 5 cm 3 g -1 h -1 , reaction temperature = 40 ~ 100 ° C, adsorption time = 3h.

[0059] Determination of reactor outlet Hg 0 concentration, and calculate the Hg 0 The adsorption capacity and penetration rate are shown in Table 1.

[0060] Table 1 Hg of different samples 0 Adsorption amount (μg) and penetration rate

[0061]

[0062] It can be seen from Table 1 that under the same reaction conditions, the adsorption of adsorbent A to Hg 0 The adsorption performance of is significantly better than that of adso...

Embodiment 3

[0064] A certain amount of used adsorbent A was placed on a fixed-bed reactor, and the mercury stability on the surface of adsorbent A was investigated by means of temperature-programmed desorption.

[0065] Adsorbent mass = 50mg; air flow = 700mL min -1 ;50-500°C temperature program (10°C / min), Hg 0 Concentrations were determined using a Lumex R915M mercury analyzer. The mercury temperature-programmed desorption of adsorbent A under air conditions after use is as follows: Figure 5 Shown:

[0066] From Figure 5 It can be seen that a mercury desorption peak appeared under air conditions, indicating that the HgS adsorbed on the surface of adsorbent A could be thermally decomposed. And when the temperature is lower than 100 °C, there is almost no Hg 0 is thermally decomposed, indicating that at room temperature Hg 0 It can be stably adsorbed on the surface of adsorbent A in the form of HgS and will not be released again.

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Abstract

The invention discloses an absorbent for the emergency treatment of indoor mercury leakage and a preparation method thereof, and belongs to the technical field of mercury adsorption. The adsorbent isprepared by the following steps: loading zinc on titanium dioxide during the preparation process, burning to obtain ZnO / TiO2, and then modifying ZnO / TiO2 through vulcanization. Titanium dioxide is taken as the carrier, the mercury adsorbing performance of zinc sulfide is obviously improved; and the prepared adsorbent has an excellent performance on adsorbing zero-valent mercury at a low temperature, can be repeatedly used in cycle, and can be applied to the emergency treatment of indoor mercury leakage under the assistance of common indoor facilities.

Description

technical field [0001] The invention belongs to the technical field of mercury adsorption, and in particular relates to an adsorbent used for mercury leakage in an emergency treatment room and a preparation method thereof. Background technique [0002] People spend at least 80% of their time indoors, so indoor air quality (IAQ) is of great significance to human health. As a highly toxic heavy metal element, mercury is bound to have a huge impact on IAQ once it is exposed indoors. Liquid Hg 0 It is commonly used in the production of various household devices such as thermometers, blood pressure monitors and fluorescent lamps, etc. Unfortunately, these household devices are generally made of glass, which breaks easily resulting in liquid Hg 0 Leakage into the indoor environment. Then, the leaked liquid Hg 0 It can quickly volatilize into the air in a confined space, resulting in Hg in the indoor air 0 The concentration is high. Therefore, it is imminent to develop a tec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/06B01J20/30B01J20/34B01D53/02
CPCB01D53/02B01D2253/1124B01D2253/1128B01D2257/602B01J20/0244B01J20/0285B01J20/06B01J20/3458B01J20/3483B01J2220/42B01J2220/4806
Inventor 杨士建梅剑王昶王军胡兴发朱焘
Owner JIANGNAN UNIV
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