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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  • Abstract
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  • Claims
  • Application Information

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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 s

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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
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Example Embodiment

[0074] Example 1

[0075] Step 1: Preparation of active material:

[0076] ⑴ Put 40mg of graphite oxide powder into 50ml of ethylene glycol at 15℃ and ultrasonic for 1h30min to obtain solution 1;

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

[0078] ⑶Mix solution 1 and solution 2, and stir at 25℃ for 30min. 2 Heat the mixed solution in an oil bath at a constant temperature of 110°C for 1 hour under an atmosphere, and quickly add 10 g of ascorbic acid 5 minutes after the start of the reaction;

[0079] ⑷The precipitate obtained by centrifugal separation, washed with distilled water and alcohol for three times, dried in a constant temperature drying oven at 60°C for 12 hours, and the product is ground to obtain C@Bi / rGO composite material, of which bismuth accounts for 83.5%. XRD diagram see figure 1 , See SEM picture figure 2 , See TEM image image 3 , See in Raman diagram Figure ...

Example Embodiment

[0088] Example 2:

[0089] The electrode prepared in step 2 of Example 1 was used as the anode, the activated carbon material was used as the cathode to form an asymmetric desalination system, and the composite salt solution was the electrolyte, where the anion concentration ratio was 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 the removal rate F - : Cl - : NO 3 - : SO 4 2- = 18.9: 72.5: 2.3: 6.3, of which chloride ion removal rate is the highest, followed by fluoride ion, and then sulfate ion. See the specific results Figure 13 , Picture 11 Is the voltage and current change curve in the adsorption process, obtained by the electrochemical workstation test, Picture 12 It is the result of online monitoring of solution conductivity through a conductivity meter. Its changing trend is the same as that of current. Its periodic change reflects the good reversible cycle performance of the adsorption process.

Example Embodiment

[0090] Example 3

[0091] ⑴ Put 60mg of graphite oxide powder into 50ml of ethylene glycol at 15℃ and ultrasonic for 1h30min to obtain solution 1;

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

[0093] ⑶Mix solution 1 and solution 2, and stir at 25℃ for 30min. 2 Heat the mixed solution in an oil bath at a constant temperature of 120°C for 1 hour under an atmosphere, and quickly add 12 g of ascorbic acid 5 minutes after the start of the reaction;

[0094] (4) The precipitate obtained by centrifugal separation was washed three times with distilled water and alcohol, and dried in a constant temperature drying oven at 60°C for 12 hours. The product was ground to obtain a C@Bi / rGO composite material with a similar morphology 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.

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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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