South China University of Technology

Xinping Ouyang

Xueqing Qiu

Dongjie Yang

Hongming Lou

Weifeng Liu

Conghua Yi

Yong Qian

Yuxia Pang

Zhiqiang Fang

Jinhao Huang

Zhixian Li

Huan Wang

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

A lignosulfonate dispersion self-healing polyurea coating and a preparation method therefor. The coating is obtained by reacting the following components in parts by mass: 1-10 parts of microcapsules of a lignosulfonate-embedded healing agent; 10-100 parts a polyurea prepolymer; 20-120 parts of a mixed solution of an amino-terminated polyether and a sterically hindered amine chain extender. The preparation method for the coating comprises the steps of at room temperature, adding a mixed solution of microcapsules of a lignosulfonate-embedded healing agent, an amino-terminated polyether and a sterically hindered amine chain extender into a polyurea prepolymer and reacting same at room temperature for 10 min-4 h. The self-healing polyurea coating may be applied to the field of material surface protection, i.e., corrosion resistance of steel structures, especially marine steel structures.

Lignosulfonate dispersion self-healing polyurea coating, preparation method therefor, coating layer thereof and application thereof

A three-dimensional lignin porous carbon/zinc oxide composite material and its preparation and application in the field of photocatalysis are disclosed. The method includes preparing a lignin/zinc oxide precursor composite by a hydrothermal method from a zinc salt, a weak alkali salt and an industrial lignin, and preparing a three-dimensional lignin porous carbon/zinc oxide composite material by high temperature calcination of the lignin/zinc oxide precursor composite. The composite material has a regular three-dimensional pore structure, with zinc oxide nanoparticles uniformly embedded among the three-dimensional lignin porous carbon nanosheets. Application of the composite material to the field of photocatalysis, especially as a photocatalyst for photocatalytic degradation of organic dye pollutants, can significantly improve the degradation efficiency and rate, and has potential application value in the field of photocatalytic degradation of organic pollutants.

Three-dimensional lignin porous carbon/zinc oxide composite material and its preparation and application in the field of photocatalysis

This invention discloses a high-performance lignin-based water reducer with high degree of sulfonation and high molecular weight and its preparation method. This water reducer exhibits an excellent water-reducing performance, its water-reducing rate of this lignin-based water reducer reaches 25% at a dosage of 0.70 wt %, which is higher than that of the naphthalene-based water reducer and the sulfonated lignin water reducer prepared by oxidation and sulfonation of alkali lignin, and 28-days compressive strength ratio of the concrete with this water reducer to the concrete without this water reducer is up to 150:100. Furthermore, the water reducer of present invention will not be crystallized in winter, and the concrete iron won't be corroded. The water reducer of the present invention makes the concretes having a low bleeding rate, excellent properties of workability, anti-freeze and anti-carbonization.

Highly efficient lignin-based water-reducing agent with high degree of sulfonation and high molecular weight, and preparation method thereof

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Guangzhou, China

Xinping Ouyang