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Method for selectively electro-adsorbing halogen ions in composite salt wastewater

A halogen ion and electro-adsorption technology, which is applied in separation methods, chemical instruments and methods, water pollutants, etc., can solve the problems of weak binding and trapping of halogen ions, weak affinity, difficulty in adapting to the requirements of composite wastewater, etc., and achieve excellent Effects of regeneration stability, increased adsorption capacity, and excellent cycle stability

Active Publication Date: 2019-10-22
CENT SOUTH UNIV
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  • Description
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Problems solved by technology

The research on the process of capacitive deionization technology at home and abroad mainly focuses on the development of new electrode materials and exploring the influence of material structure characteristics on the ion adsorption performance in the solution in order to improve the desalination efficiency. Experimental and theoretical studies on the selective electrosorption behavior of specific ions in complex solution systems
Not only that, due to the weak affinity of the interface of halogen ion materials and the weak trapping effect of traditional carbon electrode materials on halogen ions, traditional electrode materials are also difficult to meet the requirements of composite wastewater treatment.

Method used

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  • Method for selectively electro-adsorbing halogen ions in composite salt wastewater
  • Method for selectively electro-adsorbing halogen ions in composite salt wastewater
  • Method for selectively electro-adsorbing halogen ions in composite salt wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0075] Step 1: Active material preparation:

[0076] (1) Put 40mg of graphite oxide powder into 50ml of ethylene glycol at 15°C for 1h30min to obtain solution 1;

[0077] ⑵The 1gBi(NO 3 ) 3 ·5H 2 O, 1gNaOH, 500mg polyvinylpyrrolidone were put into 50ml ethylene glycol and stirred at 25°C to obtain solution 2;

[0078] (3) Mix solution 1 and solution 2, stir at 25°C for 30 minutes, and 2 Under the atmosphere, heat the mixed solution with an oil bath at 110°C for 1 hour, and quickly add 10 g of ascorbic acid 5 minutes after the start of the reaction;

[0079] (4) The precipitate was obtained by centrifugation, washed three times with distilled water and alcohol, dried in a constant temperature drying oven at 60°C for 12 hours, and the product was ground to obtain the C@Bi / rGO composite material, in which bismuth accounted for 83.5%. See XRD diagram figure 1 , SEM image see figure 2 , TEM image see image 3 , see Ramantu Figure 4 , XPS figure see Figure 5 , thermogr...

Embodiment 2

[0089] The electrode obtained in step 2 of Example 1 is used as the anode, and the activated carbon material is used as the cathode to form an asymmetric desalination system, and the composite salt solution is used as the electrolyte, wherein the anion concentration ratio F - : Cl - : NO 3 - : SO 4 2- =5:9:14:22, the voltage during the cycle is 1.2V, after 10 cycles, the ratio of removal rate F - : Cl - : NO 3 - : SO 4 2- =18.9:72.5:2.3:6.3, among which the removal rate of chloride ion is the highest, followed by fluoride ion, and then sulfate ion. For specific results, see Figure 13 , Figure 11 is the voltage-current variation curve during the adsorption process, which is obtained through the electrochemical workstation test, Figure 12 It is the result obtained by online monitoring of the conductivity of the solution through a conductivity meter. Its change trend is the same as that of the current change, and its periodic change reflects the good reversible cycl...

Embodiment 3

[0091] (1) Put 60mg of graphite oxide powder into 50ml of ethylene glycol at 15°C for 1h30min to obtain solution 1;

[0092] (2) Put 1gBi(NO3)3·5H2O, 2gNaOH, and 1g polyvinylpyrrolidone into 50ml ethylene glycol and stir at 25°C to obtain solution 2;

[0093] (3) Mix solution 1 and solution 2, stir at 25°C for 30 minutes, and 2 Under the atmosphere, the mixed solution was heated and reacted with an oil bath at 120°C for 1 hour, and 12 g of ascorbic acid was quickly added 5 minutes after the reaction started;

[0094] (4) The precipitate was obtained by centrifugation, washed three times with distilled water and alcohol, dried in a constant temperature drying oven at 60°C for 12 hours, and the product was ground to obtain a C@Bi / rGO composite material similar in appearance to the example. Among them, bismuth accounts for 96.2%.

[0095] The anode was prepared according to Step 2 of Example 1 and the adsorption performance was tested according to Step 3.

[0096] The removal ...

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Abstract

The invention belongs to the field of wastewater treatment, and specifically discloses a method for selectively electro-adsorbing halogen ions in composite salt wastewater. According to the present invention, a composite bismuth electrode compounded with a C@Bi / rGO composite active material is used as an anode, a carbon material is used as a cathode, the anode and the cathode are placed in composite salt wastewater, and electro-adsorption is carried out by electrifying so as to selectively adsorb the halogen ions in the wastewater, wherein the C@Bi / rGO composite active material comprises reduced graphene oxide and carbon coated bismuth elemental particles compounded on the surface of the reduced graphene oxide in situ; and the electrode preparation method is simple, the electrode reversible cycle performance is good, and the asymmetric desalination system formed by combining with the carbon material has good selective electro-adsorption capability to fluorine and chlorine ions in composite salt wastewater.

Description

Technical field: [0001] The invention belongs to the field of waste water treatment, and in particular relates to an electrochemical selective adsorption method for compound waste water containing halogen and other anions. Background technique: [0002] Compound salt wastewater generally refers to wastewater containing a large amount of fluorine, chlorine, sulfate and other salt compounds. It has the characteristics of high concentration, complex composition and large discharge, which not only seriously affects the safety and product quality of industrial production processes, but also High risk of toxicity to the ecological environment. [0003] At present, technologies such as ion exchange, membrane treatment and evaporation crystallization are the main methods for solution desalination. Among them, ion exchange still mainly stays in the laboratory or small-scale application stage, while the mainstream processes such as conventional membrane treatment and evaporation crys...

Claims

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Application Information

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IPC IPC(8): C02F1/469C02F101/16C02F101/14C02F101/12C02F101/10
CPCC02F1/469C02F2101/101C02F2101/12C02F2101/14C02F2101/163
Inventor 王海鹰朱明飞闵小波谭翼潇柴立元王升杨卫春石岩唐崇俭
Owner CENT SOUTH UNIV
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