Adsorbent capable of removing heavy metals in industrial wastewater and preparation method thereof

A technology for industrial wastewater and adsorbents, applied in chemical instruments and methods, adsorption water/sewage treatment, water pollutants, etc., can solve problems such as difficult recovery, complicated preparation process, and high price

Active Publication Date: 2020-10-20
CHINA UNIV OF GEOSCIENCES (WUHAN)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above-mentioned adsorbents are not only complicated in preparation process and expensive, but also powdery adsorbents are difficult to separate and recycle when dispersed in liquid, and easily cause secondary pollution

Method used

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  • Adsorbent capable of removing heavy metals in industrial wastewater and preparation method thereof
  • Adsorbent capable of removing heavy metals in industrial wastewater and preparation method thereof

Examples

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preparation example Construction

[0026] Please refer to figure 1 , The invention provides a preparation method of an adsorbent capable of removing heavy metals in industrial wastewater. Its specific steps are shown in the following examples.

[0027] Here, it should be noted that the raw materials and instruments used in the following implementations are all commercially available. Wherein, the sodium hydroxide is industrial grade sodium hydroxide, and the NaOH content in the sodium hydroxide is ≥99.0wt%; the particle size of the steel slag fine powder is ≤200 mesh; the particle size of the sawdust powder is 500 mesh to 200 mesh , the wood content is more than or equal to 85wt%; the water glass is industrial grade water glass, and its modulus is 2.0-3.5.

Embodiment 1

[0029] A preparation method for an adsorbent capable of removing heavy metals in industrial wastewater, which mainly includes the following steps:

[0030] S1. Mix and stir 10wt% sodium hydroxide and 90wt% water glass until the sodium hydroxide solid particles are completely dissolved to obtain an alkali activator; wherein, the modulus of the water glass is 2.2;

[0031] S2. After mixing 58wt% of sawdust powder, 28wt% of steel slag fine powder and 14wt% of the alkali activator, grind in a grinder for 0.5 to 1 hour to obtain a uniformly mixed powder;

[0032] S3. Put the mixed powder into a mold, and keep it under the pressure condition of 110MPa for 1-3 minutes to obtain the steel slag sawdust geopolymer precursor;

[0033] S4. Dry the geopolymer precursor in an oven at 50-65°C for 8-10 hours, then roast it at 600-750°C under nitrogen protection, keep it warm for 1-2.5 hours, and obtain steel slag after cooling Sawdust carbon composite material;

[0034] S5. Repeatedly washi...

Embodiment 2

[0036] A preparation method for an adsorbent capable of removing heavy metals in industrial wastewater, which mainly includes the following steps:

[0037] S1. Mix and stir 15wt% sodium hydroxide and 85wt% water glass until the sodium hydroxide solid particles are completely dissolved to obtain an alkali activator; wherein the water glass has a modulus of 2.8;

[0038] S2. After mixing 60wt% of sawdust powder, 25wt% of steel slag fine powder and 15wt% of the alkali activator, grind in a grinder for 0.5 to 1 hour to obtain a uniformly mixed powder;

[0039] S3. Put the mixed powder into a mold, and keep it under the pressure condition of 130MPa for 1-3 minutes to obtain the steel slag sawdust geopolymer precursor;

[0040] S4. Dry the geopolymer precursor in an oven at 60-75°C for 9-11 hours, then roast it under nitrogen protection at a temperature of 700-800°C, keep it warm for 1-2.5 hours, and obtain steel slag after cooling Sawdust carbon composite material;

[0041] S5. R...

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Abstract

The invention belongs to the technical field of industrial wastewater treatment adsorbents, and particularly relates to an adsorbent capable of removing heavy metals in industrial wastewater and a preparation method of the adsorbent. The preparation method of the adsorbent comprises the following steps: mixing and stirring 10-20wt% of sodium hydroxide and 80-90wt% of water glass until sodium hydroxide particles are completely dissolved to obtain an alkali activator; mixing 55-65 wt% of sawdust powder, 20-30 wt% of steel slag powder and 10-20 wt% of the alkali activator, and grinding for 0.5-1h to obtain mixed powder; subjecting the mixed powder to mechanical pressing and forming under a pressure of 100-150 MPa to obtain a steel slag sawdust geopolymer precursor; drying the geopolymer precursor at 50-80 DEG C, then carrying out heat preservation for 1-2.5 hours at 600-850 DEG C under the protection of nitrogen to obtain a steel slag sawdust carbon composite material; and washing the steel slag sawdust carbon composite material with deionized water until the pH value of the washing water is 5-7 to obtain the adsorbent. The preparation method disclosed by the invention has the advantages of low cost, simple process, easiness in industrial production and the like, and the prepared easily recycled adsorbent for removing the heavy metals in the industrial wastewater has a good adsorption effect on the heavy metals and is easy to recycle.

Description

technical field [0001] The invention belongs to the technical field of industrial wastewater treatment adsorbents, in particular to an adsorbent capable of removing heavy metals in industrial wastewater and a preparation method thereof. Background technique [0002] The development of industrialization has increased the discharge of wastewater containing heavy metal ions, causing pollution to water bodies and soil, and directly affecting the sanitation of human drinking water. Therefore, the treatment of industrial wastewater containing heavy metal ions has become a focus of attention of scholars around the world. At present, the methods used to treat heavy metal ions in wastewater mainly include chemical precipitation, ion exchange, electrolysis, membrane separation and adsorption. Among them, the adsorption method is to use an adsorbent to adsorb one or more heavy metal ions in the water body, and then achieve the purpose of separating and enriching heavy metals through d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/30C02F1/28C02F101/22
CPCB01J20/041B01J20/06B01J20/10B01J20/20B01J2220/4806B01J2220/4825B01J2220/4887C02F1/281C02F1/283C02F2101/22
Inventor 吴雨波栗海峰罗翔罗文君
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)
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