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A kind of carbonate green rust and preparation method thereof

A carbonate and green rust technology, applied in chemical instruments and methods, iron compounds, inorganic chemistry, etc., can solve the problems of high cost and difficult operation.

Active Publication Date: 2021-06-08
WUHAN POLYTECHNIC UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method requires dropwise addition of NaOH or Fe in a strictly anaerobic operating environment. 3+ , the operation is difficult and the cost is high

Method used

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  • A kind of carbonate green rust and preparation method thereof
  • A kind of carbonate green rust and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] (1) All the reagents are of analytical grade, the water used in the experiment is ordinary distilled water, and the experimental operations are completed under normal temperature, normal pressure and open environment.

[0038] (2) preparation concentration is the sodium carbonate solution of 0.1mol / L and the ferrous chloride tetrahydrate solution that concentration is 0.07mol / L.

[0039] (3) In the 250ml beaker, pour the sodium carbonate solution prepared by 50ml step 2 and the ferrous chloride tetrahydrate solution prepared by 50ml step 2 respectively (ferrous metal and carbonate concentration are respectively 0.035mol / L and 0.05mol in the mixed solution / L, that is, the molar ratio is 1:1.43); add 3 g of reduced iron powder (the mass concentration of iron powder is 3%) to the mixed solution.

[0040] (4) Put a stirring magnet in the beaker, and place the beaker on the magnetic stirrer to stir the reaction for 6 minutes.

[0041] (5) Transfer the mixed solution (witho...

Embodiment 2

[0045] (1) All the reagents are of analytical grade, the water used in the experiment is ordinary distilled water, and the experimental operations are completed under normal temperature, normal pressure and open environment.

[0046] (2) preparation concentration is the sodium carbonate solution of 0.20mol / L and the ferrous chloride tetrahydrate solution that concentration is 0.14mol / L.

[0047] (3) Add 25ml of sodium carbonate solution, 25ml of ferrous chloride tetrahydrate solution and 50ml of distilled water in the beaker (concentrations of ferrous and carbonate in the mixed solution are respectively 0.035mol / L and 0.05mol / L, that is, the molar ratio is 1 : 1.43), add 1g reduced iron powder (iron powder mass concentration is 1%) in mixed liquor;

[0048](4) Put a stirring magnet in the beaker, and stir the reaction on a magnetic stirrer for 6 minutes.

[0049] A large amount of dark green flocs are produced and there is iron powder remaining. Transfer the reacted mixed sol...

Embodiment 3

[0052] (1) All the reagents are of analytical grade, the water used in the experiment is ordinary distilled water, and the experimental operations are completed under normal temperature, normal pressure and open environment.

[0053] (2) preparation concentration is the sodium carbonate solution of 0.20mol / L and the ferrous chloride tetrahydrate solution that concentration is 0.14mol / L.

[0054] (3) Add 12.5ml of ferrous chloride tetrahydrate solution, 25mL of sodium carbonate solution and 62.5ml of distilled water in the beaker (concentrations of ferrous and carbonate in the mixed solution are respectively 0.0175mol / L and 0.05mol / L, i.e. molar ratio 1:2.86), add 3g reduced iron powder (the mass concentration of iron powder is 3%) to the mixed solution;

[0055] (4) Put a stirring magnet in the beaker, and stir the reaction on a magnetic stirrer for 6 minutes.

[0056] A large amount of dark green flocs are produced, and the reacted mixed solution (without remaining iron powd...

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Abstract

The invention discloses a carbonate green rust and a preparation method thereof. The preparation method comprises: (1) mixing sodium carbonate solution and ferrous chloride tetrahydrate solution, then adding iron powder and stirring to obtain a mixed solution containing dark green suspended flocs; (2) mixing dark green suspended flocs After centrifuging the mixed solution of the body and discarding the upper liquid, the carbonate green rust is obtained. The method for preparing carbonate green rust by the zero-valent iron / ferrous iron composite system adopted in the present invention realizes: 1) no need to feed inert gas to ensure the anaerobic reaction environment, no need to artificially control the dissolved oxygen content in the reaction solution; 2 ) No need to add lye to control the pH value of the reaction; 3) For the added reactant Fe 0 , Fe 2+ and CO 3 2‑ There is no strict ratio control requirement.

Description

technical field [0001] The invention belongs to the technical field of inorganic chemical industry, and more specifically relates to a carbonate green rust and a preparation method thereof. Background technique [0002] Green rust is an important metastable intermediate product produced during the formation and transformation of iron oxides. Because patina has a strong ability to adsorb some heavy metal cations, organic anions and inorganic ions and its reduction performance is equivalent to that of zero-valent iron, patina has very important research and application value in sewage treatment and water quality restoration. [0003] Because patina is very sensitive to the environment and is prone to oxidation, the preparation and characterization of patina are complex and demanding. At present, the most common green rust synthesis methods are co-precipitation and oxidation. [0004] The oxidation method usually first forms Fe(OH) under anaerobic, neutral or slightly alkalin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G49/00
CPCC01G49/00
Inventor 李芙蓉王文清
Owner WUHAN POLYTECHNIC UNIVERSITY
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