Method for removing trace mercury in water solution
An aqueous solution and removal technology, used in chemical instruments and methods, water/sewage treatment, water/sludge/sewage treatment, etc., can solve the problems of producing a large amount of waste residue and unsatisfactory removal effect, and achieve less waste residue generation. , The amount of reagents is small, and the effect of reducing environmental pollution
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Embodiment 1
[0017] Example 1: Weigh 0.5 g of L-cysteine, add 50 mL of water until it is completely dissolved. In addition, weigh 1.0 g of copper nitrate trihydrate or 1.0 g of copper sulfate pentahydrate, and add 20 mL of water to dissolve it completely. The copper solution was then added dropwise to the L-cysteine solution under vigorous stirring at room temperature. After the copper solution was added dropwise, the reaction was continued for 1 hour. Afterwards, filter or centrifuge and dry to obtain a yellow-green complex of L-cysteine and copper. Measure 50 mL of an aqueous solution with a mercury content of 5 mg / L, adjust the pH to 6-7, add 0.1 g of the obtained L-cysteine-copper complex, exchange at room temperature for 24 h, and shake intermittently during this period to make it full effect. Afterwards, stand, settle and filter to remove mercury-containing precipitates. The mercury content of the filtrate was less than 0.01mg / L after ICP analysis.
Embodiment 2
[0018] Example 2: Measure 100 mL of an aqueous solution with a mercury content of 5 mg / L, and adjust the pH of the solution to 5-6. Under vigorous stirring, 0.1 g of mercaptosuccinic acid, 0.1 g of copper oxalate trihydrate and 0.2 g of ferrous sulfate heptahydrate were added. Control the pH of the solution to 7-8 (can be adjusted by adding sodium hydroxide or hydrochloric acid), and keep stirring at room temperature for 2 hours. Afterwards, it was left to stand for 24 hours, settled and centrifuged to remove the mercury-containing precipitate. The mercury content of the filtrate was less than 0.01mg / L after ICP analysis.
Embodiment 3
[0019] Example 3: Put 0.6g of dimercaptosuccinic acid and 0.9g of zinc nitrate hexahydrate or 0.4g of zinc chloride into the reactor, and react at 120-140°C for 24 hours. Afterwards, let stand to cool, filter or centrifuge to obtain the precipitated product. The product is analyzed by energy spectrum: The product is analyzed by energy spectrum: S:Zn=1:1 (molar ratio), indicating that a complex or complex of a sulfur-containing reagent and zinc has been obtained. Add 0.1 g of the obtained product to 50 mL of an aqueous solution with a mercury content of 2 mg / L, adjust the pH of the solution to 6-7, and control the temperature of the aqueous solution to 45°C. Stirring was continued for 2 hours. Afterwards, stand, settle and filter to remove mercury-containing precipitates. The mercury content of the filtrate was less than 0.01mg / L after ICP analysis.
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