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Lignin-based graphene/zinc oxide hybrid composite material and its preparation method and application

A technology of lignin-based and composite materials, which is applied in the field of lignin-based graphene/zinc oxide hybrid composite materials and its preparation, can solve the problems of high raw material cost, influence on electrochemical performance, weak force, etc., and achieves the degree of aggregation diminished effect

Active Publication Date: 2018-09-14
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The deficiencies in the preparation of graphene / zinc oxide nanocomposites at present: (1) in the preparation process, use expensive graphene or graphene oxide raw materials, and need to use strong acid or strong base to treat graphene or graphene oxide For effective dispersion, the cost of raw materials is too high, which limits its commercial application prospects; (2) the more common method used to prepare graphene or activated carbon and zinc oxide nanocomposites is to physically mix the two or use chemical means to process the raw materials. Bit loading, the carbon / zinc oxide composite material obtained by this mixed loading has weak force between the carbon component and the metal oxide component, and there is no chemical bond. This structure is easy to collapse and unstable, which greatly affects its electrochemical performance. performance, and limits its practical application

Method used

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  • Lignin-based graphene/zinc oxide hybrid composite material and its preparation method and application
  • Lignin-based graphene/zinc oxide hybrid composite material and its preparation method and application
  • Lignin-based graphene/zinc oxide hybrid composite material and its preparation method and application

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Effect test

Embodiment 1

[0052] Dissolve 100g of wood pulp alkali lignin powder in water, prepare a suspension with a concentration of 30% by weight, adjust the pH value to 10 with NaOH with a mass concentration of 30%, heat to 70°C, and add 2g of dioxane , reacted for 1.5h, 5g monochloroacetic acid was dissolved in water to prepare a solution with a concentration of 30% by weight and added to the aforementioned alkali lignin suspension, and reacted for 2h at 70°C to obtain a carboxylated lignin solution; Add 100g of zinc oxalate to the solution, stir for 60min, then dissolve 50g of acetic acid in water to prepare a solution with a concentration of 20% by weight and add it to the solution, and continue stirring for 60min to obtain a lignin / zinc salt composite solution. The solid powder of the lignin-zinc salt composite was obtained by drying, and the powder was placed in a carbonization furnace at 800° C. for 1.5 hours under an inert gas atmosphere to obtain a lignin-based graphene / zinc oxide hybrid co...

Embodiment 2

[0054] Dissolve 100g of wheatgrass alkali lignin powder in water, prepare a suspension with a concentration of 30% by weight, adjust the pH value to 11 with NaOH with a mass concentration of 30%, heat to 80°C, add 10g of ethanol, and react for 1h. Dissolve 20g of monobromoacetic acid in water to prepare a solution with a concentration of 30% by weight and add it to the aforementioned alkali lignin suspension, react at 80°C for 1 hour to obtain a carboxylated lignin solution; then add 60g of Zinc carbonate, stirred for 60min, then 20g of oxalic acid was dissolved in water to prepare a solution with a concentration of 20% by weight and added to the solution, and continued to stir for 60min to obtain a lignin / zinc salt composite solution, which was dried to obtain a lignin / zinc salt composite solution. The solid powder of the composite of lignin and zinc salt is placed in a carbonization furnace at 500° C. for 3 hours under an inert gas atmosphere to obtain a lignin-based graphene...

Embodiment 3

[0056] Take 100g of reed pulp alkali lignin powder and dissolve it in water to prepare a suspension with a concentration of 30% by weight, adjust the pH value to 12 with NaOH with a mass concentration of 30%, heat to 90°C, add 5g of ethanol, and react for 0.5 h, 10g of monobromoacetic acid was dissolved in water to prepare a solution with a concentration of 20% by weight and added to the aforementioned alkali lignin suspension, and reacted at 90°C for 1h to obtain a carboxylated lignin solution; Add 10g of zinc nitrate, stir for 30min, then dissolve 5g of oxalic acid in water to prepare a solution with a concentration of 20% by weight, add it to the solution, continue stirring for 10min to obtain a lignin / zinc salt composite solution, and dry the composite solution The solid powder of the lignin-zinc salt composite was obtained, and the powder was placed in a carbonization furnace at 650° C. for 2 hours under an inert gas atmosphere to obtain a lignin-based graphene / zinc oxide ...

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Abstract

The invention belongs to the technical field of organic / inorganic hybrid composite materials and discloses a lignin-based graphene / zinc oxide hybrid composite material and a preparation method and application thereof. The method comprises the following steps of: dissolving lignin into water, carrying out heating in an alkaline condition, adding an active agent for reaction and then adding a carboxylated reagent solution for constant-temperature reaction to obtain carboxylated lignin; adding a zinc salt to a carboxylated lignin water solution, carrying out heating reaction, adding a weak acid reagent, stirring the weak acid reagent evenly and drying the mixture to obtain a carboxylated lignin and zinc salt compound; and carrying out high-temperature calcination to obtain the lignin-based graphene / zinc oxide hybrid composite material. In the process of the preparation method, an active functional group of the carboxylated lignin and zinc ions form a chemical bond effect to form a precursor; and a lignin-based graphene / zinc oxide nano hybrid composite structure is prepared through high-temperature calcination; and the lignin-based graphene / zinc oxide nano hybrid composite structure has a potential application prospect in the fields of a super capacitor, a lithium-ion battery and photocatalysis.

Description

technical field [0001] The invention belongs to the technical field of organic / inorganic hybrid composite materials, in particular to a lignin-based graphene / zinc oxide hybrid composite material and its preparation method and application. Background technique [0002] With the rapid development of the global economy, the massive consumption of fossil fuels and the increasingly serious environmental problems, it is urgent to find clean and sustainable new energy sources. As a new environmentally friendly energy storage device, supercapacitors have broad application prospects in the field of new energy. Due to its high energy density and good cycle stability, supercapacitors are expected to replace traditional chemical batteries and become mainstream energy storage systems in the future. In supercapacitors, the electrode material is the most important component that affects its performance. At present, the electrode materials with practical prospects in the field of supercapa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G11/86H01G11/30H01G11/46H01G11/36H01M4/36
CPCH01G11/30H01G11/36H01G11/46H01G11/86H01M4/362Y02E60/10Y02E60/13
Inventor 邱学青王欢杨东杰楼宏铭欧阳新平庞煜霞钱勇
Owner SOUTH CHINA UNIV OF TECH
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