Hexavalent chromium reducing agent and preparation method thereof
一种还原剂、六价铬的技术,应用在建筑材料领域,能够解决耐高温性能差等问题,达到防止氧气氧化、解决不耐高温性以及稳定性较差的效果
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[0026] The present invention also provides a kind of preparation method of hexavalent chromium reducing agent, comprises the following steps:
[0027] In step a, 10-30 parts of dispersant are dissolved in 47-85 parts of water at 30°C-90°C, stirred and left for a period of time, 40-60 parts of iron-containing compound are dissolved in the solution, and stirred again.
[0028] Preferably, the temperature of the water is 50°C-80°C. In this step, the dispersant can be left for 1-2 hours after dissolving to remove air bubbles in the solution.
[0029] In step b, after dissolving 3 to 5 parts of reducing agent in 3 to 5 parts of water to prepare a reducing agent solution, slowly add the reducing agent solution dropwise to the solution prepared in step a, and continue stirring to obtain a dispersed nanometer zero-valent iron agent solution.
[0030] During specific implementation, since the reducing agent solution is added to the solution prepared in step a and stirred, a large num...
Embodiment 1
[0036] Dissolve 15 g of sodium carboxymethyl cellulose in 85 g of water at 40° C., and place it for 1 hour to completely remove the air bubbles to obtain an aqueous solution of sodium carboxymethyl cellulose. 5 g of sodium borohydride was dissolved in 5 g of water to obtain an aqueous solution of sodium borohydride.
[0037] Dissolve 50 g of ferrous sulfate into the above-mentioned sodium carboxymethyl cellulose aqueous solution, then gradually add the above-mentioned sodium borohydride aqueous solution dropwise, and stir for 1 hour to obtain an aqueous sodium carboxymethyl cellulose solution containing 10 g of nanometer zero-valent iron.
[0038] Mix 10 g of sodium carboxymethyl cellulose solution of nano zero-valent iron with 90 g of ferrous sulfate heptahydrate and stir for 3 hours, and dry in an oven at 50°C for 8 hours under nitrogen protection to prepare nano-zero-valent iron particles and carboxymethyl Sodium cellulose coated hexavalent chromium reducing agent.
Embodiment 2
[0040] Dissolve 10 g of sodium alginate in 47 g of water at 30° C., and place it for 2 hours to completely remove air bubbles to obtain an aqueous solution of sodium alginate. 3 g of sodium borohydride was dissolved in 3 g of water to obtain an aqueous solution of sodium borohydride.
[0041] Dissolve 40g of ferrous sulfate into the above-mentioned sodium alginate aqueous solution, then gradually add the above-mentioned sodium borohydride aqueous solution dropwise, and after stirring for 1 hour, an aqueous sodium alginate solution containing 8g of nanometer zero-valent iron is obtained.
[0042] Mix 15 g of sodium alginate solution of nano-zero-valent iron with 60 g of ferrous sulfate heptahydrate and stir for 2.5 hours, and dry in an oven at 30°C for 48 hours under nitrogen protection to prepare nano-zero-valent iron particles and sodium alginate-wrapped Hexavalent chromium reducing agent.
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