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Schwertmannite for removing hexavalent chromium pollution in wastewater and preparation method thereof

A technology of Shishi's minerals and hexavalent chromium, which is applied in the field of pollution control to achieve the effects of low production cost, convenient operation and enhanced crystallinity

Pending Publication Date: 2022-07-29
CHINA UNIV OF GEOSCIENCES (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Hexavalent chromium adsorbed on Fe 2+ Oxidative synthesis of Shi's minerals has not been reported

Method used

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  • Schwertmannite for removing hexavalent chromium pollution in wastewater and preparation method thereof
  • Schwertmannite for removing hexavalent chromium pollution in wastewater and preparation method thereof
  • Schwertmannite for removing hexavalent chromium pollution in wastewater and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0068] The present invention provides a Shishi mineral for removing hexavalent chromium pollution in waste water, and the preparation method of the Shi Shi mineral for removing hexavalent chromium pollution in waste water comprises the following steps:

[0069] (1) Mix 82.25g FeSO 4 ·7H 2 O and 5L pH value are 3 sulfuric acid solution, obtain ferrous solution after stirring and dissolving;

[0070] (2) under the rotating speed of 140rpm, in the ferrous solution obtained in step (1), add a mass solubility of 30% hydrogen peroxide solution at a speed of 1mL / 1min, and supplement the pH regulator to maintain the pH in the reaction system The value was 2.5±0.05, and the reaction solution was obtained after 24 hours of reaction at 25°C;

[0071](3) The reaction solution obtained in step (2) was allowed to stand for 24 hours successively, and was centrifuged and washed 6 times with deoxygenated deionized water, and then vacuum-dried at -80° C. for 24 hours to obtain the Shishi mine...

Embodiment 2

[0078] The present embodiment provides a Shishi mineral for removing hexavalent chromium pollution in wastewater, and the difference between the preparation method of the Shi Shi mineral for removing hexavalent chromium pollution in wastewater and Example 1 is only that this embodiment For example, the addition rate of the hydrogen peroxide solution described in step (2) was changed to 1 mL / 30 min.

[0079] The Shi Shi mineral prepared in this example was ground with a mortar and then placed in a ziplock bag for use, and denoted as S2.

[0080] Carry out BET to the S2 obtained in this example and measure the specific surface area to be 185.74m 2 / g.

[0081] image 3 The SEM image of Shi Shi mineral provided in this example, Figure 4 The EDS map of the Shi Shi mineral provided in this example.

Embodiment 3

[0083] The present embodiment provides a Shishi mineral for removing hexavalent chromium pollution in wastewater, and the difference between the preparation method of the Shi Shi mineral for removing hexavalent chromium pollution in wastewater and Example 1 is only that this embodiment For example, the addition rate of the hydrogen peroxide solution described in step (2) was changed to 1 mL / 60 min.

[0084] The Shi Shi mineral prepared in this example was ground with a mortar and then placed in a ziplock bag for use, and denoted as S3.

[0085] Carry out BET to the S3 obtained in this example and measure the specific surface area to be 210.89m 2 / g.

[0086] Figure 5 The SEM image of Shi Shi mineral provided in this example, Image 6 The EDS map of the Shi Shi mineral provided in this example.

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Abstract

The invention provides a Schwertmannite for removing hexavalent chromium pollution in wastewater and a preparation method thereof, and the preparation method comprises the following steps: (1) mixing an iron-containing precursor and an acid solution, stirring and dissolving to obtain a ferrous solution; (2) in a stirring state, adding a hydrogen peroxide solution into the ferrous solution obtained in the step (1), supplementing a pH regulator at the same time, and reacting to obtain a reaction solution; and (3) the reaction liquid obtained in the step (2) is subjected to standing, cleaning and vacuum drying in sequence, and then the Schwertmannite is obtained. The preparation method provided by the invention is simple in process flow, convenient to operate and relatively low in production cost; the adsorbent has a good adsorption effect on hexavalent chromium in the wastewater, and can better repair the wastewater.

Description

technical field [0001] The invention belongs to the field of pollution control, and relates to a schweiz mineral for removing hexavalent chromium pollution in wastewater, in particular to a schweiz mineral for removing hexavalent chromium pollution in waste water and a preparation method thereof. Background technique [0002] Chromium is commonly used in various industrial applications such as leather tanning, electroplating, paint pigments, dye production and metallurgy. But chromium is a pollutant, in which hexavalent chromium has higher carcinogenicity, mobility and solubility than trivalent chromium, posing a serious threat to ecosystems and human health. Therefore, it is of great significance to study the removal of hexavalent chromium from industrial wastewater and polluted groundwater. [0003] Adsorption is one of the most commonly used methods to remove Cr(VI). Currently, the most common adsorbent materials are natural or modified clay minerals. The adsorption ca...

Claims

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Application Information

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IPC IPC(8): C01G49/14B01J20/06B01J20/30C02F1/28C02F101/22
CPCB01J20/06C01G49/14C02F1/281C02F2101/22C01P2002/80C01P2004/03C01P2002/72
Inventor 张琢贾厚博
Owner CHINA UNIV OF GEOSCIENCES (BEIJING)
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