A kind of adsorbent for repairing cadmium polluted water body and preparation method thereof
An adsorbent, cadmium pollution technology, applied in the field of preparation of nano iron oxide, can solve problems such as unfavorable large-scale synthesis and application of nano iron oxide, complicated operation, secondary pollution, etc., and achieves low production cost, good repair effect, and reduced investment. Effect
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Embodiment 1
[0026] (1) Fresh red back osmanthus leaves are dried at 60°C for 48h, crushed through a 5-mesh sieve to obtain red back osmanthus leaves powder; weigh 10 g of red back osmanthus leaves powder, fill it in a nylon mesh bag, and put it into Heat and extract 500 ml of deionized water at 70°C for 1 hour. The extract is vacuum filtered through a 0.45 micron filter membrane, and the filtrate is collected;
[0027] (2) Slowly drip 20 ml of 0.2 mol / L ferrous sulfate solution into 100 ml of Cinnamomum fragrans leaf extract to react, then shake the mixture for 1 hour while mixing at a flow rate of 20 ml / min Compressed oxygen is passed through the liquid; after the reaction is completed, the mixture is vacuum filtered through a 0.45 micron filter membrane and rinsed with deionized water until the pH value of the eluent is constant. The solid obtained is placed in a freeze dryer to dry for 10 h, and then taken out Grind through a 200-mesh sieve to prepare nanometer iron oxide.
Embodiment 2
[0029] (1) Fresh red back osmanthus leaves are dried at 70 ℃ for 96h, crushed through a 5-mesh sieve to obtain red back osmanthus leaves powder; weigh 20 g of red back osmanthus leaves powder, fill it in a nylon mesh bag, and put it into Heat and extract 500 ml of deionized water at 70°C for 1 hour. The extract is vacuum filtered through a 0.45 micron filter membrane, and the filtrate is collected;
[0030] (2) Slowly drip 20 ml of 0.2 mol / L ferrous sulfate solution into 100 ml of Cinnamomum fragrans leaf extract to react, then shake the mixture for 1 hour while mixing at a flow rate of 20 ml / min Compressed oxygen is passed into the liquid; after the reaction is completed, the mixture is vacuum filtered through a 0.45 micron filter membrane, and rinsed with deionized water until the pH value of the eluent is constant. The obtained solid is dried in a freeze dryer for 8 h, and then taken out Grind through a 200-mesh sieve to prepare nanometer iron oxide.
Embodiment 3
[0032] (1) Fresh red back osmanthus leaves are dried at 90 ℃ for 24h, crushed through a 5-mesh sieve to obtain red back osmanthus leaves powder; weigh 50 g of red back osmanthus leaves powder, fill it in a nylon mesh bag, and put it into Heat and extract 500 ml of deionized water at 70°C for 1 hour. The extract is vacuum filtered through a 0.45 micron filter membrane, and the filtrate is collected;
[0033] (2) Slowly drip 20 ml of 0.2 mol / L ferrous sulfate solution into 100 ml of Cinnamomum fragrans leaf extract to react, then shake the mixture for 1 hour while mixing at a flow rate of 20 ml / min Compressed oxygen gas is passed into the liquid; after the reaction is completed, the mixture is vacuum filtered through a 0.45 micron filter membrane and rinsed with deionized water until the pH value of the leaching solution is constant. The solid obtained is dried in a freeze dryer for 12 h, and then taken out Grind through a 200-mesh sieve to prepare nanometer iron oxide.
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