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Method for preparing peanut shell activated carbon-based magnetic Cr(VI) adsorbent

A magnetic adsorbent and activated carbon technology, applied in chemical instruments and methods, adsorption water/sewage treatment, alkali metal oxides/hydroxides, etc., can solve the problems of unstable adsorption performance, easy to block the gaps of activated carbon, etc., and achieve easy Magnetic separation, good cycle regeneration adsorption performance, and the effect of reducing production cost

Inactive Publication Date: 2017-02-08
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method has a simple process and can prepare magnetic activated carbon with controllable pore structure in one step. However, the adhesive used in the preparation process is easy to block the pores of activated carbon, so its adsorption performance is unstable.

Method used

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  • Method for preparing peanut shell activated carbon-based magnetic Cr(VI) adsorbent
  • Method for preparing peanut shell activated carbon-based magnetic Cr(VI) adsorbent
  • Method for preparing peanut shell activated carbon-based magnetic Cr(VI) adsorbent

Examples

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Effect test

Embodiment 1

[0028] (1) Preparation of peanut shell activated carbon-based magnetic Cr(VI) adsorbent

[0029] Wash 5g of peanut shells with deionized water, dry in an oven at 100°C for 12h, and grind to 20-40 mesh. 2 Under the atmosphere, the heating rate was 5°C / min to 400°C, and the charred product was obtained after roasting at this temperature for 4 hours; then the charred product was dispersed in 28ml deionized water, and 6.2152g KOH was added, and after static immersion at room temperature for 12h Dry at 120°C for 12h, after grinding in N 2 Under the atmosphere, after 5°C / min, roast at 800°C for 30min, then wash the roasted activated product and dry it in vacuum at 60°C to obtain the peanut shell activated carbon sample.

[0030] Dissolve 0.1622g of ferric chloride hexahydrate in 60ml of ethylene glycol, add 0.4307g of anhydrous sodium acetate and stir for 30min, add 0.24g of peanut shell activated carbon sample, continue stirring at room temperature for 30min, then heat in water at...

Embodiment 2

[0034] (1) Preparation of peanut shell activated carbon-based magnetic Cr(VI) adsorbent

[0035] Wash 5g of peanut shells with deionized water, dry in an oven at 100°C for 12h, and grind to 20-40 mesh. 2 Under the atmosphere, the heating rate was 5°C / min to 400°C, and the charred product was obtained after roasting at this temperature for 4 hours; then the carbonized product was dispersed in 28ml deionized water, and 6.2152g KOH was added, and after static immersion at room temperature for 6h Dry at 120°C for 12 hours, grind and then dry in N 2 After 5°C / min in the atmosphere, roast at 750°C for 30min, then wash the roasted activated product and dry it in vacuum at 60°C to obtain a peanut shell activated carbon sample.

[0036] Dissolve 0.1622g of ferric chloride hexahydrate in 60ml of ethylene glycol, add 0.4307g of anhydrous sodium acetate and stir for 30min, add 0.24g of peanut shell activated carbon sample, continue stirring at room temperature for 30min, then heat in water...

Embodiment 3

[0040] (1) Preparation of peanut shell activated carbon-based magnetic Cr(VI) adsorbent

[0041] Wash 5g of peanut shells with deionized water, dry in an oven at 100°C for 12h, and grind to 20-40 mesh. 2 Under the atmosphere, the heating rate was 5°C / min to 400°C, and the charred product was obtained after roasting at this temperature for 4 hours; then the carbonized product was dispersed in 28ml deionized water, and 6.2152g KOH was added, and after static immersion at room temperature for 8h Dry at 120°C for 12 hours, grind and then dry in N 2 Under the atmosphere, after 5°C / min, roast at 850°C for 30min, then wash the roasted activated product and dry it in vacuum at 60°C to obtain the peanut shell activated carbon sample.

[0042] Dissolve 0.1622g of ferric chloride hexahydrate in 60ml of ethylene glycol, add 0.4307g of anhydrous sodium acetate and stir for 30min, then add 0.24g of peanut shell activated carbon sample, continue stirring at room temperature for 30min, then ...

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Abstract

The invention discloses a method for preparing a peanut shell activated carbon-based magnetic Cr(VI) adsorbent. The method specifically comprises the following steps: washing peanut shells, drying and grinding to obtain the needed particle size; then, calcining the peanut shell powder under liquid N2 protection, thereby obtaining an activated carbon precursor; dipping in KOH in a static state, drying, calcining in an N2 atmosphere, washing the calcined product, performing vacuum drying, thereby obtaining activated carbon; dispersing the activated carbon in ethylene glycol, adding ferric chloride hexahydrate and anhydrous sodium acetate, mixing and stirring, performing hydro-thermal treatment, washing the product, and performing vacuum drying, thereby obtaining the peanut shell activated carbon-based magnetic Cr(VI) adsorbent. The method disclosed by the invention has the advantages that the magnetic activated carbon which is easily separated after Cr(VI) adsorption is prepared by taking cheap and readily available peanut shells as raw materials, the magnetic activated carbon has the advantages of high specific surface area, good adsorptive property, excellent recycling performance and the like, the defect that magnetic particles easily drop is overcome, and the removal rate of over 90.6% also can be reached after recycling for four times.

Description

technical field [0001] The invention relates to the technical field of preparation and application of biomass-based magnetic activated carbon, in particular to a preparation method of peanut shell activated carbon-based magnetic Cr(VI) adsorbent. Background technique [0002] Heavy metal chromium pollution mainly comes from mining, electroplating, pigment and other industrial wastewater and landfill leachate, etc. Among them, Cr(VI) has strong oxidation, corrosion and biological toxicity, and will cause teratogenicity after being enriched in organisms through the food chain , carcinogenic and mutagenic, which seriously threaten human health. Therefore, Cr(VI) is listed as one of the eight most harmful chemical substances to the human body, and is an internationally recognized carcinogen. The treatment of Cr(VI) polluted water is urgent. Among the treatment methods of various heavy metal pollution, the adsorption method has the advantages of low treatment cost, simple operat...

Claims

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Application Information

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IPC IPC(8): B01J20/20B01J20/28B01J20/30C02F1/28C02F101/22
CPCB01J20/20B01J20/28009B01J2220/4881C02F1/283C02F2101/22C02F2303/16
Inventor 蔡卫权李忠磊刘燕何凌达赵亚真靳欣
Owner WUHAN UNIV OF TECH
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