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Treatment method of chromate-containing solution

A treatment method and chromate technology, applied in water/sewage treatment, chemical instruments and methods, special compound water treatment, etc., can solve the problems of many chemical reagents, high cost of membrane separation, and sensitivity to interfering ions, and achieve a synthesis method. Simple, large-scale production, and efficient degradation

Pending Publication Date: 2022-01-21
白银新大孚科技化工有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Regarding the removal methods of Cr(Ⅵ) in water, traditional methods include chemical treatment, ion exchange, adsorption and membrane separation, etc., but these methods have their own defects, such as chemical methods involving more chemical reagents, The ion exchange method is sensitive to interfering ions, and the cost of the membrane separation method is relatively high.

Method used

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  • Treatment method of chromate-containing solution
  • Treatment method of chromate-containing solution

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] The present embodiment provides a kind of processing method containing chromate solution, comprises the following steps:

[0019] S1: Bi 2 o 3 preparation:

[0020] Dissolve bismuth nitrate in nitric acid solution at a molar ratio of 1:8, stir until dissolved, adjust the pH to 6-8 with lye, stir magnetically at room temperature for 0.5-2 hours, filter, and wash with absolute ethanol and distilled water 3-5 times, the product is dried at 50-100°C for 1-6 hours, and then calcined at 300-600°C for 3-6 hours to obtain yellow Bi2O3;

[0021] S2: BiOCl-Bi 2 o 3 preparation:

[0022] Add an appropriate amount of hydrochloric acid of a certain concentration to the prepared Bi 2 o 3 Ultrasonic reaction in 0.5-2h, the hydrochloric acid and Bi 2 o 3 The molar ratio is 0.1-1:1, after being centrifuged for 0.5-1h and then dried at a constant temperature of 50-100°C for 2-5h, BiOCl-Bi 2 o 3 heterojunction catalysts;

[0023] S3: Degradation of chromate:

[0024] 2g / L of ...

Embodiment 2

[0029] A processing method containing chromate solution, comprising the following steps:

[0030] S1: Bi 2 o 3 preparation:

[0031] Dissolve bismuth nitrate in nitric acid solution at a molar ratio of 1:12, stir well until dissolved, adjust the pH to 6-8 with lye, stir magnetically at room temperature for 0.5-2 hours, filter, and wash with absolute ethanol and distilled water 3-5 times, the product is dried at 50-100°C for 1-6 hours, and then calcined at 300-500°C for 3-6 hours to obtain yellow Bi2O3;

[0032] S2: BiOCl-Bi 2 o 3 preparation:

[0033] Add an appropriate amount of hydrochloric acid of a certain concentration to the prepared Bi 2 o 3 Ultrasonic reaction in 0.5-2h, the hydrochloric acid and Bi 2 o 3 The molar ratio is 0.1-1:1, after being centrifuged for 0.5-1h and then dried at a constant temperature of 50-100°C for 2-5h, BiOCl-Bi 2 o 3 heterojunction catalysts;

[0034] S3: Degradation of chromate:

[0035] 2g / L of BiOCl-Bi 2 o 3 Disperse the het...

Embodiment 3

[0040] A processing method containing chromate solution, comprising the following steps:

[0041] S1: Bi 2 o 3 preparation:

[0042] Dissolve bismuth nitrate in nitric acid solution at a molar ratio of 1:16, stir until dissolved, adjust the pH to 6-8 with lye, stir magnetically at room temperature for 0.5-2 hours, filter, and wash with absolute ethanol and distilled water 3-5 times, the product is dried at 50-100°C for 1-6 hours, and then calcined at 300-600°C for 3-6 hours to obtain yellow Bi2O3;

[0043] S2: BiOCl-Bi 2 o 3 preparation:

[0044] Add an appropriate amount of hydrochloric acid of a certain concentration to the prepared Bi 2 o 3 Ultrasonic reaction in 0.5-2h, the hydrochloric acid and Bi 2 o 3 The molar ratio is 0.1-1:1, after being centrifuged for 0.5-1h and then dried at a constant temperature of 50-100°C for 2-5h, BiOCl-Bi 2 o 3 heterojunction catalysts;

[0045] S3: Degradation of chromate:

[0046] 2g / L of BiOCl-Bi 2 o 3 Disperse the heterojunc...

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Abstract

The invention discloses a treatment method of a chromate-containing solution, and belongs to the technical field of water treatment. According to the method for degrading the Cr (VI) through photocatalytic oxidation of the heterojunction BiOCl-Bi2O3, a new way is provided for removing the Cr (VI) in a water body, and secondary pollution is avoided. The method comprises the following steps: S1, preparing Bi2O3; S2, preparing BiOCl-Bi2O3; and S3, degrading chromate radicals. According to the invention, BiOCl and Bi2O3 can form heterojunctions to complement the defects of each other, so that the separation of photo-induced electrons and holes can be quickly realized, thereby effectively avoiding the compounding of the photo-induced electrons and holes; and the BiOCl-Bi2O3 heterojunction prepared by adopting an acid impregnation method can efficiently degrade a chromate-containing solution under the irradiation of visible light, and the synthesis method is simple, less in used solvent and easy to realize large-scale production, and has potential industrial application value.

Description

technical field [0001] The invention relates to the technical field of water treatment, in particular to a treatment method for a chromate-containing solution. Background technique [0002] Chromium (Cr) is a common pollutant in water and soil in my country. It mainly exists as Cr(Ⅲ) and Cr(Ⅵ) in the environment. Since Cr(Ⅵ) is toxic to human body, crops and livestock, when When it is enriched to a certain extent, in addition to strong teratogenic, carcinogenic and mutagenic effects, it can also cause various diseases in the human body, so it is listed as a priority environmental pollutant. Regarding the removal methods of Cr(Ⅵ) in water, the traditional methods include chemical treatment, ion exchange, adsorption and membrane separation, etc., but these methods have their own defects, such as the chemical method involves more chemical reagents, The ion exchange method is sensitive to interfering ions, and the cost of the membrane separation method is relatively high. [00...

Claims

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Application Information

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IPC IPC(8): C02F1/72C02F1/30B01J27/06B01J37/02C02F101/22
CPCC02F1/725C02F1/30B01J27/06B01J37/0201C02F2101/22C02F2305/10B01J35/39
Inventor 王军杨文勇王军辉姚立平陈瑜王进龙张析刘慧张永宏张龙军李飞贾存鹏王庆西夏青
Owner 白银新大孚科技化工有限公司
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