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C@Bi/rGO electro-adsorption composite active material, preparation and applications thereof

An active material and electro-adsorption technology, applied in water/sewage treatment equipment, water/sewage treatment, chemical instruments and methods, etc., can solve problems such as limiting the industrial application of CDI dechlorination technology, poor selectivity, and difficulty in adapting to treatment requirements , to achieve the effect of improving cycle stability, wide range of conditions, and good cycle reversibility

Active Publication Date: 2019-10-22
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Many types of electrodes have been developed, such as metal oxide materials, conductive polymer materials, and carbon materials. However, the electrode materials disclosed in the prior art, such as traditional carbon electrode materials, generally have an adsorption capacity of <15mg / g, and more importantly, Yes, the adsorption process is easily interfered by anions such as sulfate radicals, and the selectivity is poor, which greatly limits the industrial application of CDI dechlorination technology, especially it is difficult to meet the treatment requirements of chlorine ion-containing wastewater such as iron and steel and metallurgical industries.

Method used

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  • C@Bi/rGO electro-adsorption composite active material, preparation and applications thereof
  • C@Bi/rGO electro-adsorption composite active material, preparation and applications thereof
  • C@Bi/rGO electro-adsorption composite active material, preparation and applications thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0092] Step 1: Active material preparation:

[0093] (1) Put 40mg of graphite oxide powder into 50ml of ethylene glycol at 15°C for 1h30min to obtain solution 1;

[0094] 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;

[0095](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;

[0096] (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 , thermogra...

Embodiment 2

[0105] Sodium chloride solution adsorption data:

[0106] The electrode prepared in Step 2 of Example 1 was used as the anode, and the activated carbon material was used as the cathode to form an asymmetric desalination system, using 3mM, 7mM, and 10mM sodium chloride solutions as electrolytes. The voltage during the cycle was 1.2V, and the adsorption rates after 10 cycles were 17.88mg / g, 33.39mg / g, and 51.78mg / g, respectively. Adsorption diagram see Figure 11 . The conductivity change curve in 3mM sodium chloride solution is shown in Figure 12 ;from Figure 11 , Figure 12 It can be seen that with the increase of the initial solution concentration, the adsorption capacity increases significantly, and the conductivity curve shows a periodic change, which reflects that the system has good cycle reversibility for sodium chloride solution.

Embodiment 3

[0108] Sodium fluoride solution adsorption data:

[0109] The electrode prepared in Step 2 of Example 1 was used as the anode, and the activated carbon material was used as the cathode to form an asymmetric desalination system, using 3mM, 7mM, and 10mM sodium fluoride solutions as electrolytes. The voltage in the cycling process was 1.2V, and the adsorption capacities after 10 cycles were 20.52mg / g, 36.33mg / g, and 118.78mg / g, respectively. Adsorption diagram see Figure 13 . The conductivity change curve in 3mM sodium fluoride solution is shown in Figure 14 ;from Figure 13 , Figure 14 It can be seen that with the increase of the initial solution concentration, the adsorption capacity increases significantly, and the conductivity curve shows a periodic change, which reflects that the system has good cycle reversibility for sodium chloride solution.

[0110] It can be seen from the above test data that the composite material and the bismuth anode material prepared by the...

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Abstract

The invention belongs to the field of wastewater treatment, and specifically discloses a C@Bi / rGO electro-adsorption composite active material, which comprises reduced graphene oxide and carbon-coatedbismuth elemental particles compounded on the surface of the reduced graphene oxide in situ. The invention further discloses preparation and applications of the composite active material. The invention further relates to an electrode compounded with the C@Bi / rGO, and preparation thereof, and applications in brine. According to the present invention, the composite active material can effectively solve the problems of poor stability, poor reversibility and the like of the material, and can effectively improve the high-adsorption capacity to halogens, excellent circulation stability and excellent regeneration stability in electro-adsorption of halogens.

Description

Technical field: [0001] The invention belongs to the field of wastewater treatment, and in particular relates to the preparation of a bismuth-based electric adsorption material and the application of halogen wastewater treatment. Background technique: [0002] Halogen ions in brine or halogen-containing wastewater are difficult to be treated biochemically. If high-concentration halogen-containing solutions are directly discharged into rivers without treatment, it will destroy the natural ecological balance of the water body, deteriorate water quality, cause serious damage to fresh water resources, and even pollute them. Ground water and drinking water sources and in industrial production can severely corrode industrial equipment. Therefore, the research on the removal technology of halide ions is of great significance to ecological and environmental protection as well as safety production. [0003] At present, technologies such as ion exchange, membrane treatment and evapor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/461C02F1/469
CPCC02F1/46109C02F1/469C02F2001/46133C02F2201/46C02F2201/461
Inventor 闵小波朱明飞王海鹰谭翼潇柴立元石岩杨卫春杨志辉唐崇俭
Owner CENT SOUTH UNIV
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