Preparation method of a coral-like biochar/hydration iron oxide composite arsenic removal agent
A technology for hydrating iron oxide and biochar, applied in the field of water treatment, can solve problems such as easy agglomeration, and achieve the effect of overcoming easy agglomeration and high removal efficiency
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Embodiment 1
[0033] (1) Wash the green onion skin with deionized water to remove dust particles, and dry in an oven at 60°C;
[0034] (2) the green onion skin of step (1) gained is placed in muffle furnace, in N 2 Pyrolysis at 800 °C for 2 hours in an atmosphere, and then ground with a mortar to obtain black powder, which is biochar;
[0035] (3) Disperse 0.1 g of biochar obtained in step (2) in a ferric chloride solution (the mass of metallic iron is 0.1 g), stir magnetically for 12 h at a rotational speed of 500 r / min, let stand to remove the supernatant, and remove the sediment. Washed three times, then dried in an oven at 60°C;
[0036] (4) Add 40mL of 3mol / L sodium hydroxide solution to the precipitate obtained in step 3), continue to magnetically stir at a rotating speed of 500r / min for 12h, remove the supernatant after standing, wash the precipitate three times, and then put Dry in an oven at 60° C. to obtain a coral-like hydrated iron oxide / biochar composite arsenic remover.
Embodiment 2
[0038] (1) Wash the green onion skin with deionized water to remove dust particles, and dry in an oven at 60°C;
[0039] (2) the green onion skin of step (1) gained is placed in muffle furnace, in N 2 Pyrolysis at 800 °C for 2 hours in an atmosphere, and then ground with a mortar to obtain black powder, which is biochar;
[0040] (3) Disperse 0.1 g of biochar obtained in step (2) in ferric chloride solution (the mass of metallic iron is 0.4 g), stir magnetically at a speed of 500 r / min for 12 h, let stand to remove the supernatant, and remove the sediment. Washed three times, then dried in an oven at 60°C;
[0041] (4) 40mL of 3mol / L sodium hydroxide solution was added to the precipitate obtained in step 3), and the magnetic stirring was continued for 12h at a rotating speed of 500r / min. After standing, the supernatant was removed, the precipitate was washed three times, and then placed Oven drying at 60°C to obtain coral-like hydrated iron oxide / biochar composite arsenic re...
Embodiment 3
[0043] (1) Wash the green onion skin with deionized water to remove dust particles, and dry in an oven at 60°C;
[0044] (2) the green onion skin of step (1) gained is placed in muffle furnace, in N 2 Pyrolysis at 800 °C for 2 hours in an atmosphere, and then ground with a mortar to obtain black powder, which is biochar;
[0045] (3) Disperse 0.1 g of biochar obtained in step (2) in a ferric chloride solution (the mass of metallic iron is 0.7 g), stir magnetically for 12 h at a rotating speed of 500 r / min, and let stand to remove the supernatant, and the sediment Washed three times, then dried in an oven at 60°C;
[0046](4) 40mL of 3mol / L sodium hydroxide solution was added to the precipitate obtained in step 3), and the magnetic stirring was continued for 12h at a rotating speed of 500r / min. After standing, the supernatant was removed, the precipitate was washed three times, and then placed Oven drying at 60°C to obtain coral-like hydrated iron oxide / biochar composite arse...
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