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A method for the preparation of modified sepiolite and its application in wastewater treatment

A sepiolite and modification technology is applied in the preparation of modified sepiolite and in the field of wastewater treatment, which can solve the problems of difficulty in the treatment of membrane dope, and achieve the advantages of reducing sludge production, improving efficiency and improving catalytic activity. Effect

Active Publication Date: 2019-10-18
NANJING WONDUX ENVIRONMENTAL PROTECTION TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] At present, the mainstream technology for landfill leachate treatment in China is biochemical and membrane combination process, and the treatment of the membrane concentrate produced by this process is very difficult

Method used

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  • A method for the preparation of modified sepiolite and its application in wastewater treatment

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Experimental program
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Effect test

Embodiment 1

[0039] A kind of preparation method of modified sepiolite of the present embodiment, concrete preparation steps are as follows:

[0040] (1) Purification: Soak the natural sepiolite powder with deionized water and stir for 12 hours, the mass ratio of sepiolite to water is 1:20, then let it stand for 1 hour, remove the supernatant by suction filtration, and wash the sepiolite repeatedly for 3 times, and finally dried in a vacuum oven at 105°C to constant weight;

[0041] (2) Acid modification: place the purified sepiolite in step (1) in an acid solution with a concentration of 1mol / L and stir for 4 hours at room temperature. The mass ratio of sepiolite to acid is 1:20, and then filter with suction Sepiolite was obtained and washed with deionized water to neutrality, and dried to constant weight at 105°C in a vacuum drying oven;

[0042] (3) Impregnation loading: place the acid-modified sepiolite in step (2) in a mixed solution of metal soluble salts and organic salts and water...

Embodiment 2

[0046] A kind of preparation method of modified sepiolite of the present embodiment, concrete preparation steps are as follows:

[0047] (1) Purification: Soak the natural sepiolite powder with deionized water and stir for 18 hours, the mass ratio of sepiolite to water is 1:30, then let it stand for 1 hour, remove the supernatant by suction filtration, and wash the sepiolite repeatedly for 3 times, and finally dried in a vacuum oven at 105°C to constant weight;

[0048] (2) Acid modification: place the purified sepiolite in step (1) in an acid solution with a concentration of 2mol / L and stir for 4 hours at room temperature. The mass ratio of sepiolite to acid is 1:30, and then filter with suction Sepiolite was obtained and washed with deionized water to neutrality, and dried to constant weight at 105°C in a vacuum drying oven;

[0049] (3) Impregnation loading: place the acid-modified sepiolite in step (2) in a mixed solution of metal soluble salts and organic salts and water...

Embodiment 3

[0053] A kind of preparation method of modified sepiolite of the present embodiment, concrete preparation steps are as follows:

[0054] (1) Purification: Soak the natural sepiolite powder with deionized water and stir for 24 hours, the mass ratio of sepiolite to water is 1:40, then let it stand for 1 hour, remove the supernatant by suction filtration, and wash the sepiolite repeatedly for 3 times, and finally dried in a vacuum oven at 105°C to constant weight;

[0055] (2) Acid modification: place the purified sepiolite in step (1) in an acid solution with a concentration of 4mol / L and stir for 4 hours at room temperature. The mass ratio of sepiolite to acid is 1:40, and suction filter Sepiolite was obtained and washed with deionized water to neutrality, and dried to constant weight at 105°C in a vacuum drying oven;

[0056] (3) Impregnation loading: place the acid-modified sepiolite in step (2) in a mixed solution of metal soluble salts and organic salts and water, and Fe i...

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Abstract

The invention discloses a preparation method of modified sepiolite. According to the method, sepiolite is taken as a raw material; the method comprises the following steps: (1) purifying: soaking sepiolite in water, and stirring for 12-24h; then, standing, carrying out suction filtration to remove supernatant after standing is finished, washing the sepiolite, and drying to constant weight by usinga vacuum drying oven; (2) carrying out acid modification: putting the sepiolite, purified in the step (1), into an acid solution, stirring, carrying out suction filtration to obtain sepiolite and washing to neutral by using water, and drying to constant weight in the vacuum drying oven; (3) carrying out impregnation load: putting the sepiolite, subjected to acid modification in the step (2), intoa mixed solution of soluble metal salt, organic salt and water, and dipping at the room temperature; (4) roasting: roasting the sepiolite, subjected to impregnation load in the step (3), at the temperature of 200-400 DEG C, cooling after roasting is finished, and then evenly grinding to obtain the modified sepiolite. The modified sepiolite is simple in preparation method and high in stability, and has an efficient catalytic oxidation effect on high concentration landfill leachate.

Description

technical field [0001] The invention relates to the fields of material preparation and wastewater treatment application, in particular to a method for preparing modified sepiolite and applying it to wastewater treatment. Background technique [0002] Sepiolite is a magnesium-rich fibrous silicate clay mineral with a theoretical structural formula of Mg 8 [Si 12 o 30 ](OH) 4 12H 2 O. In its structural unit, silicon-oxygen tetrahedrons and magnesium-oxygen octahedrons alternate with each other, with layered and chain-like transitional features. It is precisely because of this unique structure that sepiolite has a high specific surface area, large porosity, good adsorption, rheology and catalytic properties, and has a broad application prospect. [0003] Sepiolite's good adsorption and catalytic properties have been developed and applied in wastewater treatment, but the surface of natural sepiolite is weakly acidic, with small channels and poor thermal stability, which li...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/745C02F1/72C02F101/16
Inventor 刘军高尚常邦华戴昕袁建海
Owner NANJING WONDUX ENVIRONMENTAL PROTECTION TECH CO LTD