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Method for removing hexavalent chromium in wastewater through magnetic adsorbent compounded by chitosan and magnetic biological carbon

A magnetic adsorbent, chitosan technology, applied in the direction of adsorption water/sewage treatment, chemical instruments and methods, water/sewage treatment, etc., can solve the problem that the adsorption performance of magnetic biochar cannot meet the required standards, and achieve surface adsorption Easy site, low cost, simple preparation method and process

Inactive Publication Date: 2015-07-22
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, it has been verified by research that the adsorption performance of magnetic biochar is far from the required standard.

Method used

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  • Method for removing hexavalent chromium in wastewater through magnetic adsorbent compounded by chitosan and magnetic biological carbon
  • Method for removing hexavalent chromium in wastewater through magnetic adsorbent compounded by chitosan and magnetic biological carbon
  • Method for removing hexavalent chromium in wastewater through magnetic adsorbent compounded by chitosan and magnetic biological carbon

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A kind of chitosan / magnetic biochar composite material of the present invention, this composite material is prepared by following method:

[0026] (1) 40gFeCl 3 ·6H 2 O was dissolved in 120mL deionized water to prepare a certain concentration of ferric chloride solution, soak 20g of water hyacinth biomass into the ferric chloride solution, stir with a glass rod for 10min, then let stand and soak for 12h;

[0027] (2) drying the soaked water hyacinth biomass at 50-60°C, grinding, and passing through a 100-mesh sieve;

[0028] (3) Put the water hyacinth biomass that has been sieved and processed into a tube furnace at 600 ° C and pass N 2 , Burn for 1h to get magnetic biochar. Wash the obtained magnetic biochar with deionized water for 2-3 times, dry at 50-60°C, grind, and pass through a 100-mesh sieve;

[0029] (4) 6g chitosan is dissolved in the acetic acid solution of 2% by volume percentage, is mixed with the chitosan solution that mass percentage is 0.6%;

[003...

Embodiment 2

[0033] The chitosan / magnetic biochar composite material prepared in Example 1 is applied to the treatment of hexavalent chromium ion wastewater, comprising the following steps: configure 6 parts of 50mg / L lead solution, use 1mol / L NaOH or HNO 3 Adjust the pH to 2, 3, 4, 5, 6, 7, respectively. Add the above-mentioned chitosan / magnetic biochar composite material, and the amount of adsorbent is 1g / L. They were placed in constant temperature shaking at 30°C. The oscillator speed is 150 rpm, and the oscillation time is 24h. After the reaction is over, place it on a magnet to separate the adsorbent from the solution, and the adsorption process ends. The content of unadsorbed hexavalent chromium in the wastewater was determined by ultraviolet spectrophotometry, and the calculated adsorption results are shown in Table 1.

[0034] Table 1: Effects of different pH values ​​on the removal of hexavalent chromium in wastewater by chitosan / magnetic biochar composites

[0035]

[0036...

Embodiment 3

[0038] The chitosan / magnetic biochar composite material prepared by embodiment 1 is applied to the treatment of hexavalent chromium ion wastewater, comprising the following steps: getting an initial concentration of 100mg / L of hexavalent chromium solution, adjusting the pH value of the solution to 2.0, Add the chitosan / magnetic biochar composite material that embodiment 1 makes, the consumption of this composite is 1g / L, carry out adsorption reaction at 20,30 and 40 ℃ air bath constant temperature oscillator respectively, and the rotating speed is 150rpm, 24 Hours later, the complex was separated from the waste water with a magnet, and the content of unadsorbed hexavalent chromium in the waste water was measured by ultraviolet spectrophotometry. The calculated adsorption results are shown in Table 2.

[0039]Table 2: Chromium adsorption data of chitosan / magnetic biochar composites under different temperature conditions

[0040]

[0041] It can be seen from Table 2 that the ...

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Abstract

The invention discloses a method for removing hexavalent chromium in wastewater through a magnetic adsorbent compounded by chitosan and magnetic biological carbon. The compounded magnetic adsorbent comprises the magnetic biological carbon, and the chitosan is combined on a magnetic biological carbon matrix. The preparation method comprises the following steps: firstly, utilizing FeCl3.6H2O to soak water hyacinth biomass; secondly, performing pyrolysis and calcination on the soaked biomass to obtain the magnetic biological carbon; finally, compounding the chitosan onto the surface of the magnetic biological carbon. The application steps are as follows: adding a composite material into the wastewater containing the hexavalent chromium with the concentration of 20-500 mg / L, wherein the usage amount of the composite material is 1-2 g / L; carrying out an oscillation and adsorption reaction at 10-50 DEG C for a period of time, and then separating the compound from the wastewater with a magnet to finish the removal of hexavalent chromium ions. The method has the advantages of being low in cost, simple in process, high in absorption property, easy in separation process, environmentally-friendly and the like.

Description

technical field [0001] The invention belongs to the field of environmental functional materials and water treatment new technologies, in particular to a method for removing hexavalent chromium in waste water by using a magnetic adsorbent compounded with chitosan and magnetic biochar. Background technique [0002] Chromium has a wide range of industrial uses, mainly in metal processing, electroplating, and tanning industries. The waste water and waste gas discharged by these industries are the main sources of pollution in the environment. As a toxic heavy metal, chromium is highly toxic and bioaccumulative, and it can cause serious health problems even at very low concentrations. Normally, chromium exists in two stable states of trivalent chromium and hexavalent chromium in wastewater. Among them, hexavalent chromium is far more mutagenic and carcinogenic than trivalent chromium. my country's "Sewage Comprehensive Discharge Standard" (GB8978-1996) clearly stipulates that th...

Claims

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Application Information

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IPC IPC(8): C02F1/28C02F1/62B01J20/24B01J20/30
Inventor 张明明刘云国李婷婷曾光明谭小飞王慧胡新将郭方颖王姝凡
Owner HUNAN UNIV
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