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Schwertmannite prepared by alkali neutralization method and application of schwertmannite

A technology of schwittmannite and application method, applied in chemical instruments and methods, other chemical processes, water/sludge/sewage treatment, etc., can solve the problems affecting the preparation rate of schwittmannite, small specific surface area, unfavorable Cr adsorption And other issues

Pending Publication Date: 2021-09-14
南京贝克特环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] At present, the preparation methods of Schwittmann stone mainly include biological method and chemical synthesis method. In the method of biological synthesis of Schwittmann stone, the bacteria used are easily affected by external environmental conditions, which affect the preparation rate of Schwittmann stone; The Chinese invention patent with the publication number CN110152689A discloses a chemical synthesis method of high-yield Schwittmannite and is used to remove tetracycline in water, but its specific surface area is still small, which is not conducive to the large-scale adsorption of Cr(VI)

Method used

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  • Schwertmannite prepared by alkali neutralization method and application of schwertmannite
  • Schwertmannite prepared by alkali neutralization method and application of schwertmannite
  • Schwertmannite prepared by alkali neutralization method and application of schwertmannite

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Embodiment 1

[0041] This embodiment provides the preparation of Schwittmannite by alkali neutralization method, and the specific steps are as follows:

[0042] Configure 80mmol / L of Fe in the Erlenmeyer flask 2+ (as FeSO 4 is the iron source) solution, to the Fe-containing 2+ Add 1.60mL H to the solution 2 o 2 , at H 2 o 2 After adding, adjust the pH to 2.7 with lye (5MNaOH) every 30min, and react in a shaking table at 180r / min for 24 hours; after the product is collected by membrane filtration and washed several times, an improved Schwittmannite adsorbent is obtained. Samples were preserved after vacuum freeze-drying.

[0043] Schwittmann's stone synthesized by alkali neutralization figure 1 (b), from figure 1 From the SEM spectrum of b, it can be seen that the synthesized Schwittmannite is a solid particle with a smooth spherical appearance and a size of 100nm; figure 2 The XRD pattern verified that the synthesized Schwittmannite (the characteristic peaks of 26.26°, 35.16°, 4...

Embodiment 2

[0045] This embodiment provides the preparation of Schwittmannite by alkali neutralization method, and the specific steps are as follows:

[0046] Configure 80mmol of Fe in the Erlenmeyer flask 2+ (as FeSO 4 is the iron source) solution, to the Fe-containing 2+ Add 1.45mLH to the solution 2 o 2 , at H 2 o 2 After the addition, the pH was adjusted to 2.5 with lye (5M NaOH) every 40 minutes, and reacted on a 160r / min shaker for 20 hours; the product was collected by membrane filtration and washed several times to obtain an improved Schwittmannite adsorbent. Samples were preserved after vacuum freeze-drying.

[0047] figure 2 The XRD figure of verification is that Schwittmannite (26.26°, 35.16°, 46.53° and 61.34° characteristic peaks correspond to the standard card of Schwittmannite respectively) shows that Schwittmannite is successfully prepared. The particles prepared by Schwittmannite are smaller, with a size of 150nm; image 3 The infrared analysis spectrum in shows...

Embodiment 3

[0058] The present embodiment provides the application of the Schwittmannite prepared by the alkali neutralization method in removing Cr(VI) in water, which specifically includes the following steps:

[0059] Prepare Cr(VI) (concentration is 100mg / L) solution in the reaction bottle, adjust the pH to be 3, then add 1g / L Schwittmannite prepared in Example 1; carry out adsorption experiment at room temperature 25 ℃, reach adsorption equilibrium Then the Cr(VI) adsorption amount was determined.

[0060] from Figure 5 It can be seen that when pH=3, the dissolved SO of the Schwittmannite prepared by alkali neutralization 4 2- 26.78mg / g; Dissolution of SO from ordinary Sch prepared without pH control 4 2- The amount is 12.41mg / g, indicating that the Schwittmannite prepared by alkali neutralization and pH control dissolves more SO 4 2- , which is conducive to the occurrence of ion exchange, which is conducive to the adsorption of more Cr(VI), such as Figure 4 As shown, the ad...

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Abstract

The invention discloses schwertmannite prepared by an alkali neutralization method and application of the schwertmannite, and belongs to the field of sewage treatment. According to the invention, the schwertmannite prepared through an alkali neutralization method is smaller in particle, larger in specific surface area and more in sulfate radical functional groups; when the schwertmannite is applied to removal of Cr (VI) in water, a larger number of sulfate radical functional groups can be dissolved out by controlling the pH value of a Cr (VI) solution, so that the Cr (VI) in the water is efficiently removed; and the method is simple to operate, low in cost, short in reaction time and free of secondary pollution to the environment, and has a good application prospect in removal of heavy metals such as Cr (VI) and the like in water.

Description

technical field [0001] The invention belongs to the field of sewage treatment, and in particular relates to Schwittmannite prepared by an alkali neutralization method and an application thereof. Background technique [0002] Chromium is a multivalent metal ion that widely exists in nature, with divalent, trivalent and hexavalent. Because divalent chromium is unstable, chromium mainly exists in two forms: positive trivalent Cr(III) and positive hexavalent Cr(VI), and the different valence states have different impacts on the environment and biological effects. Among them, trivalent chromium is an essential trace element for the human body, and is non-toxic under normal supply doses; while hexavalent chromium is easily absorbed by the human body through the cell membrane, interferes with the normal physiological process of the human body, and is highly corrosive to the skin and mucous membranes of the human body. And carcinogenicity, it is a carcinogenic and mutagenic inducin...

Claims

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Application Information

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IPC IPC(8): B01J20/02C02F1/28B01J20/30C02F101/22
CPCB01J20/0281B01J20/0262B01J20/0229C02F1/281C02F2101/22Y02W10/37
Inventor 周立祥李婷丁葆亭
Owner 南京贝克特环保科技有限公司
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