Preparation of polyethyleneimine-attapulgite adsorbent and method for adsorbing hexavalent chromium
A polyethyleneimine, attapulgite technology, applied in chemical instruments and methods, adsorption water/sewage treatment, water/sludge/sewage treatment, etc., can solve the problem of low hexavalent chromium adsorption and achieve good economic Benefits and environmental benefits, simple operation, high removal efficiency
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[0023] The preparation method of polyethyleneimine-attapulgite adsorbent of the present invention, concrete steps are as follows:
[0024] Step 1: Add 5 g of attapulgite raw ore soil and 0.08 g of sodium polyacrylate into 150 mL of distilled water, mix and ultrasonically disperse for 10 to 30 minutes, then filter to remove large particles at the bottom of the beaker, centrifuge, dry, grind, and roast; the roasted Attapulgite is placed in a hydrochloric acid solution with a concentration of 1 to 5 mol / L (the mass volume ratio of the roasted attapulgite to the hydrochloric acid solution is 1:20g / mL) and then ultrasonically dispersed at 80°C to 90°C for 1~ 2h, finally filter, wash until neutral, and dry for later use;
[0025] Step 2: Add the acidified attapulgite in step 1 into toluene (the mass volume ratio of acidified attapulgite to toluene is 1:50-100g / mL) and ultrasonically disperse for 15-20min under the protection of nitrogen, then raise the temperature to After reaching...
Embodiment 1
[0032] Step 1: Add 5 g of attapulgite raw ore soil and 0.08 g of sodium polyacrylate into 150 mL of distilled water, mix and ultrasonically disperse for 10 minutes, then filter to remove large particles at the bottom of the beaker, centrifuge, dry, grind, and roast; the roasted attapulgite Place the soil in 100mL of hydrochloric acid solution with a concentration of 5mol / L and ultrasonically disperse it, then react at 80°C for 1h, finally filter, wash until neutral, and dry for later use;
[0033] Step 2, add 2.0g of acidified attapulgite to 100mL of toluene and disperse ultrasonically for 15min under nitrogen protection, then raise the temperature to 110°C, add 3mL of γ-chloropropyltrimethoxysilane to react for 12h, filter, and then use Purified by absolute ethanol for 12 hours and then dried in vacuum at 60°C for 12 hours to obtain silanized attapulgite (CP-ATP);
[0034] Step 3, add 1g of silanized attapulgite to 2g of polyethyleneimine aqueous solution with a concentration...
Embodiment 2
[0036] Step 1, add 5g of attapulgite raw ore soil and 0.08g of sodium polyacrylate into 150mL of distilled water, mix and ultrasonically disperse for 20 minutes, then filter to remove large particles at the bottom of the beaker, centrifuge, dry, grind, and roast; the roasted attapulgite Place the soil in 100mL of hydrochloric acid solution with a concentration of 1mol / L and ultrasonically disperse it, then react at 90°C for 1.5h, finally filter, wash until neutral, and dry for later use;
[0037]Step 2, add 2.0g of acidified attapulgite into 150mL of toluene and disperse ultrasonically for 20min under nitrogen protection, then raise the temperature to 115°C, add 2mL of γ-chloropropyltrimethoxysilane to react for 11h, filter, and then use Purified by absolute ethanol for 8 hours and then dried in vacuum at 60°C for 12 hours to obtain silanized attapulgite (CP-ATP);
[0038] Step 3: Add 1 g of silanized attapulgite to 2.5 g of an aqueous solution with a concentration of 2% polye...
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