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Method for adsorbing hexavalent chromium-containing wastewater by using bismuth ferrite modified charcoal compound

A technology of adsorption treatment and biochar, applied in the direction of adsorption water/sewage treatment, water/sewage treatment, chemical instruments and methods, etc., can solve the problems of selective adsorption, expensive materials, small adsorption capacity, etc., and achieve high Industrial application value, high adsorption capacity, low cost effect

Inactive Publication Date: 2020-03-31
YANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the currently commonly used adsorption methods in China have certain defects, such as expensive materials, small adsorption capacity, and selective adsorption needs to be improved.

Method used

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  • Method for adsorbing hexavalent chromium-containing wastewater by using bismuth ferrite modified charcoal compound
  • Method for adsorbing hexavalent chromium-containing wastewater by using bismuth ferrite modified charcoal compound
  • Method for adsorbing hexavalent chromium-containing wastewater by using bismuth ferrite modified charcoal compound

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] A kind of bismuth ferrite modified biological charcoal compound of the present invention absorbs the method that contains hexavalent chromium waste water, comprises the following steps:

[0041] (1) Weigh 10-20 grams of pomegranate shells, add them to 0.5mol / L hydrochloric acid solution, wash them, dry and chop them for later use;

[0042](2) carbonize the chopped pomegranate shells after step (1) under nitrogen atmosphere at 400-500°C for 2 hours;

[0043] (3) Weigh 5 to 10 grams of carbonized pomegranate shells, add 5 to 10 grams of zinc chloride in deionized water, stir at 80 to 100°C for 5 to 10 hours at an impregnation ratio of 1 to 3, and filter with suction to obtain filtrate;

[0044] (4) Suction filtration to obtain filtrate is calcined at 600-800°C for 1-2 hours under nitrogen atmosphere, and after cooling, adjust pH to 6 with 0.5mol / L hydrochloric acid;

[0045] (5) Weigh 0.5 to 1 gram of bismuth nitrate hexahydrate, 0.5 to 1 gram of ferric nitrate nonahydr...

Embodiment 2

[0051] A kind of bismuth ferrite modified biological charcoal compound of the present invention absorbs the method that contains hexavalent chromium waste water, comprises the following steps:

[0052] (1) Weigh 10-20 grams of pomegranate shells, add them to 0.5mol / L hydrochloric acid solution, wash them, dry and chop them for later use;

[0053] (2) carbonize the chopped pomegranate shells after step (1) under nitrogen atmosphere at 400-500°C for 2 hours;

[0054] (3) Weigh 5 to 10 grams of carbonized pomegranate shells, add 5 to 10 grams of zinc chloride in deionized water, stir at 80 to 100°C for 5 to 10 hours at an impregnation ratio of 1 to 3, and filter with suction to obtain filtrate;

[0055] (4) Suction filtration to obtain filtrate is calcined at 600-800°C for 1-2 hours under nitrogen atmosphere, and after cooling, adjust pH to 6 with 0.5mol / L hydrochloric acid;

[0056] (5) Weigh 0.5 to 1 gram of bismuth nitrate hexahydrate, 0.5 to 1 gram of ferric nitrate nonahyd...

Embodiment 3

[0062] A kind of bismuth ferrite modified biological charcoal compound of the present invention absorbs the method that contains hexavalent chromium waste water, comprises the following steps:

[0063] (1) Weigh 10-20 grams of pomegranate shells, add them to 0.5mol / L hydrochloric acid solution, wash them, dry and chop them for later use;

[0064] (2) carbonize the chopped pomegranate shells after step (1) under nitrogen atmosphere at 400-500°C for 2 hours;

[0065] (3) Weigh 5 to 10 grams of carbonized pomegranate shells, add 5 to 10 grams of zinc chloride in deionized water, stir at 80 to 100°C for 5 to 10 hours at an impregnation ratio of 1 to 3, and filter with suction to obtain filtrate;

[0066] (4) Suction filtration to obtain filtrate is calcined at 600-800°C for 1-2 hours under nitrogen atmosphere, and after cooling, adjust pH to 6 with 0.5mol / L hydrochloric acid;

[0067] (5) Weigh 0.5 to 1 gram of bismuth nitrate hexahydrate, 0.5 to 1 gram of ferric nitrate nonahyd...

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Abstract

The invention relates to a method for adsorbing hexavalent chromium-containing wastewater by using a bismuth ferrite modified charcoal compound. The preparation method comprises the following steps: cleaning pomegranate shells with hydrochloric acid, chopping and introducing the treated pomegranate shells in a furnace for carbonizing, dispersing the carbonized pomegranate shells in a zinc chloridesolution, reacting while violently stirring at high temperature, carrying out suction filtration, cleaning, drying, carrying out high-temperature carbonization in a nitrogen atmosphere to obtain activated charcoal, and cleaning with hydrochloric acid; weighing and dissolving the activated charcoal, bismuth nitrate hexahydrate, ferric nitrate nonahydrate and polyvinylpyrrolidone into deionized water, uniformly stirring, dropwise adding potassium hydroxide to adjust the pH value, and continuously stirring; finally, transferring an obtained mixture into a high-pressure reaction kettle to react,centrifugally separating, and cleaning with ethanol and deionized water; drying to obtain a bismuth ferrite modified charcoal compound finished product. In applications, the bismuth ferrite modified charcoal compound is added into hexavalent chromium-containing wastewater, adsorption is performed after uniform stirring, and the adsorption capacity of a prepared sample on hexavalent chromium is determined. According to the method, the bismuth ferrite modified charcoal compound is large in hexavalent chromium adsorption capacity, low in treatment cost and environmentally friendly.

Description

technical field [0001] The invention relates to a method for adsorbing and treating waste water containing hexavalent chromium with a bismuth ferrite modified biochar compound, belonging to the technical field of sewage treatment. Background technique [0002] In recent years, with the public's increasing awareness of environmental protection, various new water treatment technologies have emerged as the times require. Adsorption technology is considered to be one of the new water treatment technologies with great development potential. Because of its advantages of simple operation, quick effect, designable and recyclable adsorbent, and environmental friendliness, it has been widely used in the treatment of wastewater containing hexavalent chromium. The vigorous development of metallurgical industry, metal processing, electroplating, tanning, paint, printing and dyeing, pigment and other industries has gradually increased the wastewater containing heavy metal chromium discha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/02C02F1/28C02F101/22
CPCB01J20/0229B01J20/20B01J2220/4806B01J2220/4825C02F1/281C02F1/283C02F2101/22
Inventor 张娅许姗王宏归
Owner YANGZHOU UNIV
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