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Compound material used for hexavalent chromium removal and preparation method thereof

A composite material and hexavalent chromium technology, which is applied in the field of magnetic biochar/iron tetrasulfide composite material and its preparation, can solve the problems of small specific surface area and single surface adsorption active center of ordinary iron-based materials, and achieves low cost, The effect of rich surface functional groups and simple operation

Inactive Publication Date: 2019-02-12
WENZHOU MEDICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, ordinary iron-based materials have a small specific surface area and a single active center for surface adsorption.

Method used

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  • Compound material used for hexavalent chromium removal and preparation method thereof
  • Compound material used for hexavalent chromium removal and preparation method thereof
  • Compound material used for hexavalent chromium removal and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A magnetic biochar / ferric iron tetrasulfide composite material for hexavalent chromium removal, prepared by the following steps:

[0034] 1) Using rice husks as raw materials, thermally cracking them at 600°C for 2 hours under oxygen-limited conditions to obtain black biochar solids;

[0035] 2) The biochar obtained in 1) is pulverized by a pulverizer with a power of 1000W for 5 minutes, and the obtained powder is passed through a 100-mesh sieve;

[0036] 3) The biochar powder obtained in 2) is soaked and washed with 0.1mol / L hydrochloric acid to remove impurities such as ash and residue in the biochar;

[0037] 4) Put the biochar powder obtained in 3) in a blast drying oven, set the temperature at 90°C, and dry for 6 hours, and the obtained solid is clean biochar;

[0038] 5) Dissolve ferrous sulfate heptahydrate in 25mL of ethylene glycol;

[0039] 6) Thoroughly mix 1.0 g of biochar with the iron-containing solution in step 5) by ultrasonic;

[0040] 7) Dissolve L-...

Embodiment 2

[0051] Four kinds of magnetic biochar / ferric iron tetrasulfide composite materials prepared in Example 1 are applied to the treatment of waste water containing hexavalent chromium ions, comprising the following steps:

[0052] 1) Weigh an appropriate amount of potassium dichromate and dissolve it in ultrapure water to make a 20mg / L hexavalent chromium ion stock solution;

[0053] 2) Take 50mL of the above hexavalent chromium stock solution in a 100mL conical flask, weigh 0.04g of FC-5, FC-10, FC-20, FC-30 composite materials in the solution, and immediately transfer to constant temperature shaking In the device, set the rotation speed to 200r / min and the temperature to 25°C;

[0054] 3) After reacting for 5, 10, 20, 30, 40, and 60 minutes respectively, take 1 mL of sample and 2 mL of diphenylcarbazide color developer to develop color, and measure the absorbance of the mixture with a UV-visible spectrophotometer;

[0055] The absorbance obtained after the reaction solution was c...

Embodiment 3

[0059] The magnetic biochar / ferric sulfide composite material prepared in Example 1 is applied to the treatment of waste water containing hexavalent chromium ions, comprising the following steps:

[0060] 1) Weigh an appropriate amount of potassium dichromate and dissolve it in ultrapure water to make a 20mg / L hexavalent chromium ion stock solution;

[0061] 2) Take 50mL of the above hexavalent chromium stock solution in a 100mL Erlenmeyer flask, weigh 0.01, 0.02, 0.03, 0.04, 0.05g of FC-30 composite material in the solution, and immediately transfer to a constant temperature oscillator, set the speed 200r / min, the temperature is 25℃;

[0062] 3) After reacting for 5, 10, 20, 30, 40, and 60 minutes respectively, take 1 mL of sample and 2 mL of diphenylcarbazide color developer to develop color, and measure the absorbance of the mixture with a UV-visible spectrophotometer;

[0063] The absorbance obtained after the reaction solution is colored after the above reaction is analy...

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Abstract

The invention provides a compound material used for hexavalent chromium removal and a preparation method thereof. The compound material is prepared from charcoal and magnetic ferriferrous sulfide loaded onto a charcoal matrix; the preparation method comprises the steps that through a pyrolysis and calcination method, rice hull is used as a raw material to prepare the charcoal; the charcoal is immersed in a solution containing ferrous sulfate, L-cysteine is used as a sulfur source, ethylene glycol is used as a solvent, and through a solvothermal method, the magnetic charcoal / ferriferrous sulfide compound material is synthesized in one step; application comprises the steps that the compound material is added into hexavalent chromium wastewater with a concentration of 20 mg / L, the usage amount of the compound material is 0.2-1.0 g / L, and after oscillatory reaction is carried out for a period of time at 25 DEG C, a magnet is used for separating the compound material and the solution, so that hexavalent chromium ions in the wastewater are removed. The compound material used for hexavalent chromium removal and the preparation method thereof have the advantages that the compound materialpreparation method is simple, low in cost, environmentally friendly and high in efficiency of removing the hexavalent chromium ions in the wastewater and the like.

Description

technical field [0001] The invention relates to the field of preparation technology of functionalized materials and the field of water pollution control, in particular to a magnetic biochar / iron tetrasulfide composite material for hexavalent chromium removal and a preparation method thereof. Background technique [0002] Chromium is widely used in electroplating, metallurgy, leather tanning, wood processing, dye manufacturing and other industries. Due to the limitations of treatment technology and supervision, high-concentration chromium-containing wastewater is discharged into natural water bodies, and even directly pollutes drinking water sources. Among the top ten highly toxic pollution problems reported in the world in 2012, chromium pollution ranked third. According to the Comprehensive Prevention and Control Plan of Heavy Metal Pollution in Zhejiang Province (2010-2015), the total discharge of chromium accounts for 95.02% of the total discharge of industrial heavy met...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/28B01J20/30C02F1/28C02F1/48C02F101/22
CPCB01J20/0229B01J20/0285B01J20/20B01J20/28009C02F1/281C02F1/283C02F1/488C02F2101/22
Inventor 刘伟徐进王学东夏芳刘佳刘军李艳艳周佩佩王翠翠
Owner WENZHOU MEDICAL UNIV
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