Chitin-based biomass charcoal double-sided electrode slice for electroadsorption and preparation method thereof

Abstract

The invention relates to a chitin-based biomass charcoal double-sided electrode slice for electroadsorption and a preparation method thereof. The preparation method comprises the steps: cleaning chitin powder, drying and sieving, and carrying out heat preservation for 1-2 h in a nitrogen atmosphere at the temperature of 400-500 DEG C, to obtain pre-carbonized powder; mixing the pre-carbonized powder and potassium hydroxide powder, then placing the mixture in a vacuum tube furnace, and carrying out heat preservation for 2-3 h at the temperature of 800 DEG C-900 DEG C to obtain biomass charcoalpowder I; adding the biomass charcoal powder I into a 10 wt% HCl solution, stirring and cleaning, to obtain biomass charcoal powder II; mixing an electrically conductive agent, the biomass charcoal powder II and polyvinylidene fluoride, dissolving the mixture in dimethylacetamide, and mixing; and uniformly coating both sides of a current collector titanium slice with the obtained mixed slurry, drying, and freeze-drying to prepare the chitin-based biomass charcoal double-sided electrode slice for electroadsorption. The production cost is low, and the prepared product has small internal resistance of the electrodes, high capacitance and good adsorption performance, and is suitable for treating different water qualities.

Description

technical field [0001] The invention belongs to the technical field of chitin-based biomass carbon double-sided electrode sheets. In particular, it relates to a chitin-based biomass carbon double-sided electrode sheet for electric adsorption and a preparation method thereof. Background technique [0002] Electrosorption technology has the advantages of safety and high efficiency, simple equipment, easy maintenance, low energy consumption, environmental friendliness, high salinity removal rate and anti-fouling, so it is widely used in the treatment of high-salt wastewater (Huang Wei. Capacitive deionization electrode Material desalination characteristics and treatment of high-salt wastewater from vanadium extraction [D]. Wuhan: Wuhan University of Technology, 2014). However, some experimental studies on electroadsorption desalination generally have problems such as low adsorption efficiency and low electrode usage, which restrict the industrial application of electroadsorpti...

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Problems solved by technology

However, some experimental studies on electroadsorption desalination generally have problems such as low adsorption efficiency and low electrode usage, which restrict the industrial application of electroadsorption desalination to a certain extent (Wang L, Zhou Y, Wang J, et al. al.Approaching capacitivedeionization(CDI)on desalination of water and wastewater-new progress and its potential[J].Advanced Materials Research,2015,1088(3):557-561; Zhang Shichun, Liu Haining, Wang Shidong, etc. Electrodesorption electrode preparation research Progress [J]. Industrial Water Treatment, 2017, 37(5):5-9)

[0003] At present, widely used carbon materials are considered as an ideal electrode material due to their good electrical conductivity, large specific surface area, excellent chemical stability and controllable morphology, including activated carbon, carbon aerogel, carbon nano However, most of these carbon materials are expensive and complicated to produce, making it difficult to produce them on a large scale

The surface of ordinary carbon-based materials is hydrophobic, which leads to an increase in the contact resistance between salt solution ions and the pores on the surface of carbon materials, which greatly reduces its capacitance performance (Duan Xiaoyue, Chang Limin, Liu Wei, etc. The influence of electrode electrosorption performance[J].Environmental Science and Technology, 2010,33(5):63-66; Li Na, Han Yiming, Xu Jianxiong, etc. Surface modification and electrochemical performance of ordered mesoporous carbon materials[ J]. Functional Materials, 2015, 46(S1):25-29)

[0004] In the preparation process of electrode sheets, commonly used methods include tablet pressing method and mold shaping method, but these methods also have the problem of uneven distribution of electrode materials on the current collector (Gao feng, Shao guanghua, Qu jiangying, Lvsiyuan, Li yuqian, Wu mingbo. Tailoring of porous and nitrogen-rich carbons derived from hydrochar for high-performance supercapacitor electrodes. Electrochimica Acta, 2015, 155, 201-208)

At present, there are not many studies on the preparation of electrode sheets by coating method. Meng Yulan (Meng Yulan. Preparation of porous carbon and flow electrode and research on its desalination performance [D]. Dalian University of Technology, 2015) used the coating method to prepare The electrode also has the problems of high electrode material cost and large electrode internal resistance.

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