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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  • Description
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  • Application Information

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Problems solved by technology

However, it has been verified by research that the adsorption pe

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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

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Example Embodiment

[0024] Example 1:

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

[0026] (1) 40g FeCl 3 ·6H 2 O was dissolved in 120 mL of deionized water to prepare a certain concentration of ferric chloride solution, 20 g of water hyacinth biomass was immersed in the ferric chloride solution, stirred with a glass rod for 10 minutes, and then left to soak for 12 hours;

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

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

[0029] (4) Dissolving 6 g of chitosan in an acetic acid solution whose volume percentage is 2% is prepared into a chitosan solution who...

Example Embodiment

[0032] Example 2:

[0033] The chitosan / magnetic biochar composite material prepared in Example 1 was applied to the treatment of hexavalent chromium ion wastewater, including the following steps: preparing 6 parts of 50mg / L lead solution, using 1mol / L NaOH or HNO 3 The pH was adjusted to 2, 3, 4, 5, 6, and 7, respectively. The above-mentioned chitosan / magnetic biochar composite material was added, and the amount of adsorbent was 1 g / L. They were placed in constant temperature shaking at 30°C. The rotating speed of the oscillator was 150 rpm, and the shaking time was 24 h. After the reaction is completed, it is placed 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 from wast...

Example Embodiment

[0037] Example 3:

[0038] The chitosan / magnetic biochar composite material prepared in Example 1 was applied to the treatment of hexavalent chromium ion wastewater, including the following steps: taking a hexavalent chromium solution with an initial concentration of 100 mg / L, adjusting the pH of the solution to 2.0, The chitosan / magnetic biochar composite material obtained in Example 1 was added, and the dosage of the composite was 1 g / L, and the adsorption reaction was carried out at 20, 30 and 40 °C air bath thermostatic oscillator respectively, and the rotation speed was 150 rpm, 24 After 1 hour, the composite was separated from the waste water with a magnet, and the content of unadsorbed hexavalent chromium in the waste water was determined by ultraviolet spectrophotometry. The results of the calculated adsorption amount are shown in Table 2.

[0039]Table 2: Chromium adsorption data of chitosan / magnetic biochar composites at different temperatures

[0040]

[0041] I...

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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...

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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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