Method for removing hexavalent chromium in water by using modified diatomite-loaded nanoscale zero-valent iron
A technology of nano-zero-valent iron and diatomite, which is applied in the direction of chemical instruments and methods, water pollutants, adsorption water/sewage treatment, etc. Zero-valent iron is easy to agglomerate and other problems, achieving the effect of fast removal speed, good chemical reduction, and no secondary pollution
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example 1
[0032] Take 30g of diatomaceous earth and put it into 600ml of hydrochloric acid with a molar concentration of 1mol / L, stir for 30min, filter, wash with deionized water and then filter, dry at 110°C for 600min, and seal it for storage. Add 3g of chitosan to 600ml of acetic acid solution with a mass fraction of 1%, stir for 1.5h, then add 30g of pickled diatomite to it, stir for 5h at room temperature, wash with deionized water until the pH is neutral , filtered, dried at 60°C for 600 min, and sealed for storage.
[0033] Put the modified diatomite in a 1000mL three-neck flask, add 250mL of deionized water, and continue to pass nitrogen gas for 15min to ensure deoxygenation, while stirring continuously. The dosage of modified diatomite is 0.28, 0.56, 1.12, 2.24g respectively, that is, the mass ratio of diatomite to nano zero-valent iron is 0.5:1, 1:1, 2:1, 4:1. Take by weighing 2.78g ferrous sulfate heptahydrate and add in the above-mentioned solution and constantly stir nitro...
example 2
[0039] Example 2: Put 30g of diatomaceous earth into 600ml of hydrochloric acid with a molar concentration of 1mol / L, stir for 30min, filter, wash and filter again, dry at 110°C for 600min, and seal it for storage. 3g of chitosan is added to 600ml of acetic acid solution with a mass fraction of 1%, stirred for 1.5h, then 30g of diatomite after pickling is added to it, stirred for 5h at normal temperature, washed until the pH is neutral, filtered, and Dry at 60°C for 600 minutes, and store in a sealed container.
[0040] Put 1.12g of modified diatomaceous earth into a 1000mL three-necked flask, add 250mL of deionized water, and continue to pass nitrogen gas for 15min to ensure deoxygenation, while constantly stirring. Take by weighing 2.78g ferrous sulfate heptahydrate and add in the above-mentioned solution and constantly stir nitrogen gas, after ferrous sulfate heptahydrate is completely dissolved, drip 250ml of sodium borohydride solution of 0.16mol / L to The solution was co...
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