South China University of Technology

Guangdong University of Technology

Jinhao Huang

Xueqing Qiu

Dongjie Yang

Hongming Lou

Weifeng Liu

Yong Qian

Conghua Yi

Yuxia Pang

Zhixian Li

Xinping Ouyang

Yuan Li

Zhiqiang Fang

Yanlin Qin

Dafeng Zheng

Huan Wang

Wenyuan Guo

Mingsong Zhou

The present invention belongs to the technical field of biomass carbon materials, and relates to a lignin porous carbon nanosheet, a preparation method therefor, and an application thereof in supercapacitor electrode materials. The method of the present invention performs layer-by-layer self-assembly of sulfonated lignin and oxalate in a selective solvent to prepare a layer-by-layer self-assembled lignin/oxalate composite, which is then carbonized and pickled to obtain the lignin porous carbon nanosheets. The lignin porous carbon nanosheets prepared by the above method of the present invention have a specific surface area of 200-1500 m/g, a micropore specific surface area of 100-500 m/g, a mesoporous specific surface area of 100-1000 m/g, a pore diameter of 0.5-30 nm, and a pore volume of 0.5-1.5 cm/g; they can be applied to supercapacitor electrode materials, showing higher specific capacitance and excellent rate performance (with a specific capacitance retention rate of 76.6%), having good potential application value.

Lignin porous carbon nanosheet, preparation method therefor, and application thereof in supercapacitor electrode materials

The present invention discloses a lignin-based hierarchical porous carbon with high specific surface area and preparation method and application thereof. The present invention employs maleic anhydride, acrylic acid, and hypophosphorous acid to modify a lignin, then performs a cross-linking reaction with a glutaraldehyde-triethanolamine condensate to prepare a lignin graft-copolymerized by phosphino carboxylic acid copolymer, and then dropwise adding a soluble calcium salt solution and a soluble carbonate solution into the lignin graft-copolymerized by phosphino carboxylic acid copolymer dispersion successively, co-precipitates to prepare a lignin/nano CaCOcomplex, finally obtains a lignin-based hierarchical porous carbon with high specific surface area through carbonizing at a high temperature. The preparation method of the present invention may enable nano CaCOto be uniformly and stably dispersed in a three-dimensional network structure of the lignin graft-copolymerized by phosphino carboxylic acid copolymer, realizing full and uniform complexation of the lignin with nano CaCO.

Lignin-based hierarchical porous carbon with high specific surface area and preparation method and application thereof

A method for promoting enzymolysis of lignocellulose by using a pH-responsive lignin amphoteric surfactant and recovery of a cellulase. The method includes: adding lignocellulose to a buffer solution, and then adding a pH-responsive lignin amphoteric surfactant and a cellulase; controlling the pH of the mixed solution to be 4.0-6.2, heating the solution to a temperature of 40&#xb0; C. to 60&#xb0; C. and reacting at said temperature for 24-96 h to obtain a saccharified hydrolyzate of lignocellulose; and obtaining an enzymolysed liquid by solid-liquid separation, and then adjusting the pH of the enzymolysed liquid to precipitate the pH-responsive lignin amphoteric surfactant and the cellulase for recycling. The method can effectively improve the enzymolysis efficiency of lignocellulose, recover a certain amount of cellulase, and expand the applications of industrial lignin. The method does not require additional equipment, and is simple to operate and environmentally friendly.

Method for promoting enzymolysis of lignocellulose by using pH-responsive lignin amphoteric surfactant and recovery of cellulase

The preparation method includes: adding an activating agent into a basic alkaline lignin solution first, then adding a carboxylating agent and reacting to obtain a carboxylated alkaline lignin; dissolving a phosphorylating agent into water, adding epichlorohydrin, and reacting to obtain a hydroxyl phosphate type compound; mixing the carboxylated alkaline lignin and the hydroxyl phosphate type compound and reacting to obtain a lignin type polymer; adding an inorganic nanoparticle suspension into the lignin type polymer and adding an acid for codeposition to obtain the product after aging and drying.

Inorganic/lignin type polymer composite nanoparticles, preparation method therefor and application thereof

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Guangzhou, China

Jinhao Huang