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Double-ion desalination electrode and preparation method thereof

A dual-ion and desalination technology, which is applied in the field of preparation of dual-ion desalination electrodes, can solve the problems of complex pore structure, low effective surface area, and poor desalination efficiency, and achieve high effective surface area, high desalination rate, and high desalination amount.

Active Publication Date: 2019-07-12
NINGXIA UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the symmetric capacitive deionization method using carbon-based electrodes has disadvantages such as complex pore structure, low effective surface area, double layer overlap effect, poor desalination efficiency, and low charge efficiency.

Method used

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  • Double-ion desalination electrode and preparation method thereof
  • Double-ion desalination electrode and preparation method thereof
  • Double-ion desalination electrode and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The MXene@NTO composite material is used as the negative electrode material, and the NiCo-Ox@graphene composite material is used as the positive electrode material.

[0035] Preparation of MXene@NTO composite material: According to the amount of adding at least 10ml of NaOH solution per 0.1g of MXene, add MXene to NaOH solution with a concentration of 2mol / L, hydrothermally react at 300°C for 3h, and let it stand to cool naturally to room temperature ; After filtering the obtained reaction product, wash it with deionized water at least twice, and dry it in vacuum at 60° C. for at least 10 h to obtain the MXene@NTO composite material.

[0036] Preparation of NiCo-Ox@graphene composite material: Weigh nickel chloride hexahydrate, cobalt chloride hexahydrate and hexamethylenetetramine according to the molar ratio of 10:5:32 and dissolve them in 30ml deionized water, stir magnetically for 15min Add graphene oxide into the mixed solution, the amount of graphene oxide added p...

Embodiment 2

[0039] The MXene@NTO composite material is used as the negative electrode material, and the NiCo-Ox@graphene composite material is used as the positive electrode material.

[0040] Preparation of MXene@NTO composite material: According to the amount of adding at least 10ml of NaOH solution per 0.1g of MXene, add MXene to NaOH solution with a concentration of 4mol / L, hydrothermally react at 260°C for 6h, and let it stand to cool naturally to room temperature ; After the obtained reaction product was filtered, washed with deionized water at least twice, and dried in vacuum at a temperature of 50° C. for at least 10 h, the MXene@NTO composite material was obtained.

[0041] Preparation of NiCo-Ox@graphene composite material: Weigh nickel chloride hexahydrate, cobalt chloride hexahydrate and hexamethylenetetramine according to the molar ratio of 10:5:32 and dissolve them in 30ml deionized water, stir magnetically for 15min ;Add graphene oxide to the mixture, the amount of graphene...

Embodiment 3

[0044] The MXene@NTO composite material is used as the negative electrode material, and the NiCo-Ox@graphene composite material is used as the positive electrode material.

[0045] Preparation of MXene@NTO composite material: According to the amount of adding at least 10ml of NaOH solution per 0.1g of MXene, add MXene to NaOH solution with a concentration of 6mol / L, hydrothermally react at 220°C for 5h, and let it stand to cool naturally to room temperature ; After the obtained reaction product is filtered, washed with deionized water at least twice, and vacuum-dried at a temperature of 30-50° C. for at least 10 hours to obtain a MXene@NTO composite material.

[0046] Preparation of NiCo-Ox@graphene composite material: Weigh nickel chloride hexahydrate, cobalt chloride hexahydrate and hexamethylenetetramine according to the molar ratio of 10:5:32 and dissolve them in 30ml deionized water, stir magnetically for 15min ;Add graphene oxide into the mixture, the amount of graphene ...

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Abstract

The invention discloses a double-ion desalination electrode and a preparation method thereof. An MXene@NTO composite is adopted as an anode material, and a NiCo-Ox@graphene composite or a bamboo shootcarbonized material is adopted as a cathode material. The MXene@NTO comprises components of Ti3C2@Na4Ti5O12&Na4Ti9O20 and is prepared through the following steps: MXene is added to a NaOH solution with the concentration being 1-10 mol / L according to the amount that every 0.1 g of MXene is added to at least 10 ml of the NaOH solution, a hydrothermal reaction is conducted at 100-300 DEG C for 1-6 h, a product is left to stand, and the product is cooled to the normal temperature naturally; after the reaction product is filtered, the product is washed with deionized water at least twice, and vacuum drying is performed at 30-80 DEG C for at least 10 h to obtain the MXene@NTO composite. The prepared desalination electrode has regular pore structure, high effective surface area, high desalination amount, high desalination rate and low energy consumption, can be applied to preparation of a double-ion capacitor desalination electrode and can be assembled into a double-ion desalination batteryand applied to water environment treatment to rapidly and efficiently remove Na<+>, Cl<->, SO4<2-> and F<-> in water environments, and a new way is provided for low-energy-consumption and high-performance desalination.

Description

technical field [0001] The invention belongs to the technical field of dual-ion capacitor desalination, and in particular relates to a preparation method of a dual-ion desalination electrode. Background technique [0002] With the rapid growth of population and the continuous expansion of industrialization process, the shortage of fresh water has become one of the biggest threats to human beings. Desalination of seawater and brackish water is a viable option for addressing freshwater supply. [0003] Seawater desalination is the use of seawater desalination to produce fresh water. Seawater desalination methods currently used include seawater freezing method, electrodialysis method, distillation method, reverse osmosis method, and ammonium carbonate ion exchange method. Currently, reverse osmosis membrane method and distillation method are the most popular in the market mainstream. Among them, the distillation method has high energy consumption, and the reverse osmosis memb...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/469C02F101/10C02F101/12C02F101/14C02F103/08
CPCC02F1/4604C02F1/4691C02F2103/08C02F2101/10C02F2101/101C02F2101/12C02F2101/14
Inventor 罗民杨顺周瑞娟郭晓旭
Owner NINGXIA UNIVERSITY