LDH (layered double hydroxide) microspheres for sewage treatment and preparation method
A layered bimetallic and hydroxide technology, applied in chemical instruments and methods, water pollutants, water/sewage treatment, etc., can solve problems such as difficult removal of heavy metals, achieve excellent adsorption and prevent shedding effects
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[0027] Example 1
[0028] (1) Preparation of iron-calcium layered double metal hydroxide: After mixing 18 mol of calcium chloride with an aqueous solution containing 6 mol of ferric chloride, add N-methylpyrrolidone dispersant and 7.5 mol (molar amount) Graphene (calculated by carbon), add 0.2mol urea precipitant, and hydrothermally react at 140 degrees Celsius for 5 days to obtain graphene-containing iron-calcium layered bimetallic hydroxide. After cooling, it is centrifuged and washed to pH 7.0 with alcohol. Wash twice and dry; (2) Fixation of graphene-containing iron-calcium layered double metal hydroxide: Combine the graphene-containing iron-calcium layered double hydroxide after step (1) drying with 300g The molten waste glass is collided with a spray method to form microspheres of layered double metal hydroxide fixed by microporous glass.
[0029] Take 200g of prepared microspheres of layered bimetallic hydroxide fixed by microporous glass into 10L of an aqueous solution wit...
Example Embodiment
[0030] Example 2
[0031] (1) Preparation of iron-calcium layered double metal hydroxide: After mixing 15 mol of calcium chloride with an aqueous solution containing 6 mol of iron sulfate, add N-methylpyrrolidone dispersant and 7.5 mol (molar amount to Carbon meter), add 0.2mol of urea precipitant and hydrothermally react at 150 degrees Celsius for 4 days to obtain graphene-containing iron-calcium layered bimetallic hydroxide. After cooling, it is centrifuged, washed with water to pH 7.0, and washed with alcohol. 2 times, drying; (2) Fixation of graphene-containing iron-calcium layered double metal hydroxide: melt the dried graphene-containing iron-calcium layered double hydroxide of step (1) with 300g The waste glass is sprayed to form microspheres of layered double metal hydroxide fixed by microporous glass.
[0032] Take 200g of prepared microspheres of layered bimetallic hydroxide fixed by microporous glass into 10L of an aqueous solution with a lead content of 0.5mg / L, a merc...
Example Embodiment
[0033] Example 3
[0034] (1) Preparation of iron-calcium layered double metal hydroxide: After mixing 18 mol of calcium chloride with an aqueous solution containing 6 mol of ferric chloride, add N-methylpyrrolidone dispersant and 7.5 mol (molar amount) Graphene (calculated by carbon), add 0.2mol hexamethylenetetramine precipitant, hydrothermally react at 155 degrees Celsius for 4 days to obtain graphene-containing iron-calcium layered bimetallic hydroxide. After cooling, centrifuge and wash until pH7.0, washed twice with alcohol, and dried; (2) Fixation of graphene-containing iron-calcium layered bimetallic hydroxide: Step (1) dried graphene-containing iron-calcium layered bimetal The hydroxide and 300 g of molten waste glass are collided with a spray method to form microspheres of layered double hydroxide fixed by microporous glass.
[0035] Take 200g of prepared microspheres of layered bimetallic hydroxide fixed by microporous glass into 10L of an aqueous solution with a lead c...
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