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Electrochemical preparation device, preparation method and application of Fe < 2 + >/Fe < 3 + > hydroxide

A hydroxide and preparation device technology, applied in the field of environmental remediation, can solve the problems of increased preparation cost, difficult actual operation, low product recovery rate, etc., and achieves the effects of fast preparation rate and high product purity

Active Publication Date: 2020-11-17
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The co-precipitation method needs to strictly control oxygen in the actual operation and operate under anaerobic conditions, which brings difficulties to the actual operation and increases the production cost. In addition, there will be needle-shaped iron oxide impurities in the co-precipitation synthesis product. Product recovery rate is not high

Method used

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  • Electrochemical preparation device, preparation method and application of Fe &lt; 2 + &gt;/Fe &lt; 3 + &gt; hydroxide
  • Electrochemical preparation device, preparation method and application of Fe &lt; 2 + &gt;/Fe &lt; 3 + &gt; hydroxide
  • Electrochemical preparation device, preparation method and application of Fe &lt; 2 + &gt;/Fe &lt; 3 + &gt; hydroxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Such as figure 1 As shown, a Fe 2+ / Fe 3+ Electrochemical preparation device for hydroxide, used to prepare Fe 2+ / Fe 3+ Hydroxide, comprising a reactor 1, the reactor 1 is provided with an iron-containing anode 2, a porous electrode 3, a cation exchange membrane 4 and a cathode 5 in sequence from the outside to the inside, and the porous electrode 3 is attached to the iron-containing anode 2 Inside, the cation exchange membrane 4 divides the reaction chamber into an anode chamber 6 and a cathode chamber 7, and the reactor 1 is provided with a water inlet 8 and a water outlet 9, and the water inlet 8 is located at the bottom of the reactor, connected to the anode The chamber communicates, and the water outlet 9 is located at the top of the reactor and communicates with the cathode chamber 7. The iron-containing anode 2 is any one of stainless steel or pure iron or cast iron or cast steel or Masteel or gray cast iron or gray iron material; the cathode 5 is an inert e...

Embodiment 2

[0037] The anode 2 is made of stainless steel, the porous electrode 3 is made of carbon felt, and the cathode 5 is made of graphite;

[0038] (1) On the anode 2 and the cathode 5 of the reactor 1, feed a direct voltage of 16V;

[0039] (2) The NaCl solution of 1mol / L is passed into the anode chamber 6 at the water inlet 8 at a flow rate of 4mL / min, and positively charged cations Fe 2+ , Fe 3+ and Na + Enter the cathode chamber 7 through the cation exchange membrane, and the anion OH in the cathode chamber 7 — Reaction, the effluent after the reaction flows out from the water outlet 9;

[0040] (3) The water outlet 9 is connected to the aeration bottle, and argon gas is introduced into the water outlet, argon gas is used for continuous aeration, and a magnetic stirrer is used for continuous stirring until fully deoxygenated;

[0041] (4) Leave the effluent after deoxygenation to stand, pour out the supernatant after the sediment precipitates, take the sediment and wash it w...

Embodiment 3

[0043] The anode 2 is made of stainless steel, the porous electrode 3 is made of glassy carbon, and the cathode 5 is made of graphite or stainless steel;

[0044] (1) On the anode 2 and the cathode 5 of the reactor 1, feed a direct voltage of 16V;

[0045] (2) The NaCl solution of 1mol / L is passed into the anode chamber 6 at the water inlet 8 at a flow rate of 4mL / min, and positively charged cations Fe 2+ , Fe 3+ and Na + Enter the cathode chamber 7 through the cation exchange membrane, and the anion OH in the cathode chamber 7 — Reaction, the effluent after the reaction flows out from the water outlet 9;

[0046] (3) The water outlet 9 is connected to the aeration bottle, and argon gas is introduced into the water outlet, argon gas is used for continuous aeration, and a magnetic stirrer is used for continuous stirring until fully deoxygenated;

[0047] (4) Leave the effluent after deoxygenation to stand, pour out the supernatant after the sediment precipitates, take the s...

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Abstract

The invention relates to an electrochemical preparation device, preparation method and application of Fe < 2 + > / Fe < 3 + > hydroxide. The electrochemical preparation device is used for preparing theFe < 2 + > / Fe < 3 + > hydroxide and comprises a reactor, wherein an iron-containing anode, a porous electrode, a cation exchange membrane and a cathode are sequentially arranged in the reactor from outside to inside, and the porous electrode is attached to the inner side of the iron-containing anode; the water inlet end is positioned at the bottom of the reactor, and the water outlet end is positioned at the top of the reactor. The electrochemical preparation method comprises the following steps: introducing direct-current voltage to an anode and a cathode of a reactor; introducing a NaCl solution into the water inlet end at a certain flow rate; introducing argon into the effluent, and continuously aerating the system until the oxygen is fully removed; and washing the precipitate with oxygen-free water for multiple times to obtain the Fe < 2 + > / Fe < 3 + > hydroxide. The method is low in production cost, high in yield, simple in process and capable of rapidly and efficiently preparingthe Fe < 2 + > / Fe < 3 + > hydroxide and applying the hydroxide to water environment restoration.

Description

technical field [0001] The invention relates to the technical field of environmental remediation, in particular to a Fe 2+ / Fe 3+ Electrochemical preparation device and method of hydroxide. Background technique [0002] Fe 2+ / Fe 3+ Hydroxide is a reductive iron-based hydroxide, commonly known as green rust, which is a typical layered double hydroxide, containing ferrous ions and iron ions, and its molecular structure is [Fe(Ⅱ ) 1-x Fe(Ⅲ) x (OH) 2 ] x+ ·[(x / n)A n- , mH 2 O] x- , where A n- Represents the anion mixed in the green rust layer, x represents the molar ratio of ferric iron to total iron (0.25-0.33). Common patina includes patina mixed with sulfate, patina mixed with carbonate, and patina mixed with chloride ions. Fe 2+ / Fe 3+ As a kind of iron-based hydroxide with reducing activity, hydroxide has high chemical reduction activity to heavy metal ions and halogenated organic substances, and plays an important role in water environment restoration and p...

Claims

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Application Information

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IPC IPC(8): C25B9/10C25B1/00C25B11/03C02F1/467C02F101/20
CPCC02F1/4678C02F2101/20C25B1/00
Inventor 黄理志杨攀陈轶群刘子正
Owner WUHAN UNIV
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