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Waste solution mercury removal adsorbent, preparation method and application method thereof

A technology of adsorbent and adsorbent carrier, applied in the field of environmental protection, can solve the problems of inability to recycle, high cost, waste of mercury resources, etc., and achieve the effect of low preparation cost and convenient use method

Active Publication Date: 2014-03-12
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the reaction speed of these adsorbents and chemical reagents is slow and the cost is high
At the same time, the mercury in the wastewater is finally discarded in the form of solid waste, which cannot be recycled.
This may not only cause secondary pollution due to the release of mercury in solid waste, but also cause waste of mercury resources

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Take by weighing 10g particle diameter and be that 0.25mm activated alumina is standby as adsorbent carrier, configure 100ml zinc sulfide nano-adsorbent reaction precursor solution (zinc chloride 0.5mol / L, thiourea 2mol / L, mercaptopropionic acid 1.5mol / L ). Immerse 10 g of activated alumina in the nano-adsorbent reaction precursor solution, and react with stirring at a speed of 100 rpm at a temperature of 95° C. for 1 hour. The activated alumina loaded with zinc sulfide is separated by filtration, and dried at room temperature of 25 degrees for 5 hours to prepare the zinc sulfide nano-mercury removal adsorbent. After testing, the loading capacity of the nano-adsorbent on the activated alumina is about 32%. The specific surface area of ​​mercury removal adsorbent is about 367m 2 / g.

Embodiment 2

[0030] Take by weighing 10g particle size and be the molecular sieve of 0.25mm as the adsorbent carrier for subsequent use, configure 100ml ferrous sulfide nano-adsorbent precursor solution (ferrous chloride 1mol / L, oleic acid 3mol / L, sulfur simple substance 3mol / L, eighteen Alkene 100ml). 10 g of molecular sieves were impregnated in 100 ml of ferrous sulfide nano-adsorbent precursor solution, and reacted with stirring at a speed of 500 rpm for 1 hour at a temperature of 250 degrees Celsius. The molecular sieve loaded with ferrous sulfide is separated by filtration and washing, and dried at room temperature of 25 degrees for 5 hours to prepare a mercury-removing adsorbent for ferrous sulfide. After testing, the loading capacity of the nano-adsorbent on the molecular sieve is about 45%. Mercury removal adsorbent has a specific surface area of ​​483m 2 / g.

Embodiment 3

[0032] 0.1 g of the zinc sulfide nanosorbent prepared in Example 1 was placed in 50 mL of mercuric chloride solution with a concentration of 200 mg / L, and stirred at a speed of 400 rpm. After 5 minutes, the solution was treated by filtration, and the filtrate was tested. The results showed that the removal efficiency of mercury in the solution was greater than 99.9%, and the residual mercury ion concentration was less than 1 μg / L.

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Abstract

The invention relates to a waste solution mercury removal adsorbent, a preparation method and an application method thereof. A material with high specific surface area and large pore volume is adopted as the adsorbent carrier, the material is immersed into a reaction precursor solution of a metal sulfide or metal selenide nanometer adsorbent, organic acid, organic amine, sulfhydryl compound or polyhydric alcohol is used as a reactant ligand, the reactant ligand reacts with a sulphur and selenium precursor through metal ions to generate the metal sulfide or metal selenide nanometer adsorbent, the adsorbent deposits on the surface of the carrier, and the mercury removal adsorbent with high adsorption capacity is prepared. According to the invention, the mercury removal adsorbent is prepared to a filter layer to filter the waste solution containing mercury ions; the mercury ions in a liquid phase are adsorbed onto the adsorbent to fulfill the purpose of liquid phase mercury removal by utilizing exchanging of the metal ions on the material and the mercury ions. The waste solution mercury removal adsorbent is suitable for removal and recycling of mercury in waste water of mercury-involved industries.

Description

technical field [0001] The invention belongs to a waste water mercury removal technology in the field of environmental protection, and mainly directly synthesizes a nano-adsorbent loaded with metal sulfide or metal selenide on a material with high specific surface area and pore volume to prepare a mercury-removal adsorbent with high adsorption capacity. In the process of use, the metal ions on the adsorbent are exchanged with mercury ions in the waste liquid, and then adsorbed on the adsorbent to achieve the purpose of removing mercury in the liquid phase. Background technique [0002] Studies have shown that mercury has become a global pollutant, causing obvious harm to human health and the environment. To this end, in 2013, after years of negotiations in more than 140 countries in the United Nations, a legally binding "International Convention on the Prevention and Control of Mercury Pollution" was finally adopted, which will monitor and limit the production and trade of m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/08B01J20/14B01J20/18B01J20/12B01J20/20B01J20/32C02F1/28C02F1/62
Inventor 李良晏乃强瞿赞
Owner SHANGHAI JIAO TONG UNIV
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