Biomass hydrothermal carbon with high specific surface area and preparation method thereof

A technology with high specific surface area and specific surface area, applied in the preparation/purification of carbon, etc., can solve the problems of high preparation process temperature, cumbersome preparation process, serious equipment corrosion, etc., and achieves low preparation cost, simple preparation process and high porosity. Effect

Pending Publication Date: 2021-12-14
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The Chinese invention patent application with the publication number CN112691642A discloses a method for preparing an adsorbent by using hydrothermal carbonization technology. 2 / g of hydrothermal carbon, the whole preparation process of this method is relatively cumbersome, and the porosity is poor
The Chinese invention patent application with the publication number CN111253960A discloses a low-temperature preparation method of straw biochar. The preparation method uses straw as raw material and prepares a specific surface area of ​​22.38-26.81m by adding an ammoniating agent in a hydrothermal system. 2 / g of hydrothermal carbon, the preparation process temperature of this method is high, the porosity is poor, and the equipment corrosion is serious

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] This example is a method for preparing grapefruit peel hydrothermal carbon with a high specific surface area. Cheap and renewable grapefruit peel is selected as a raw material for preparation. The specific steps of the preparation method are as follows:

[0028] 1) Remove the pulp and outer skin of fresh pomelo to obtain white fluffy pomelo skin and dry and grind it to obtain pomelo peel powder with a particle size between 60 mesh and 80 mesh;

[0029] 2) Add the pomelo peel powder obtained in step 1 into a 1% NaOH solution at a solid-to-liquid ratio of 1:100, and react at 100°C for 360 minutes;

[0030] 3) After filtering and separating the solid-liquid mixture obtained in step 2, form a solid-liquid mixture of 1:10 with deionized water and place it in a hydrothermal reaction kettle, add 4 mg / L of Fe 2+ and H 2 o 2 Fenton's reagent with a mass fraction ratio of 1:3, wherein the Fenton's reagent is prepared with ferrous sulfate and 30% hydrogen peroxide, reacted hydro...

Embodiment 2

[0035] This example is a method for preparing hydrothermal carbon from pomelo peels with a high specific surface area. Cheap and renewable grapefruit peels are selected as raw materials for preparation. The specific steps of the preparation method are as follows:

[0036] 1) Remove the pulp and outer skin of fresh pomelo to obtain white fluffy pomelo skin and dry and grind it to obtain pomelo peel powder with a particle size between 60 mesh and 80 mesh;

[0037] 2) Add the pomelo peel powder obtained in step 1 into a 1% NaOH solution at a solid-to-liquid ratio of 1:50, and react at 100°C for 30 minutes;

[0038] 3) After filtering and separating the solid-liquid mixture obtained in step 2, form a 1:30 solid-liquid mixture between the solid and deionized water and place it in a hydrothermal reaction kettle, add 1 mg / L of Fe 2+ and H 2 o 2 Fenton's reagent with a mass fraction ratio of 1:1, wherein the Fenton's reagent is prepared with ferrous sulfate and 30% hydrogen peroxide...

Embodiment 3

[0043]This example is a method for preparing hydrothermal carbon from pomelo peels with a high specific surface area. Cheap and renewable grapefruit peels are selected as raw materials for preparation. The specific steps of the preparation method are as follows:

[0044] 1) Remove the pulp and outer skin of fresh pomelo to obtain white fluffy pomelo skin and dry and grind it to obtain pomelo peel powder with a particle size between 60 mesh and 80 mesh;

[0045] 2) Add the pomelo peel powder obtained in step 1 into a 1% NaOH solution at a solid-to-liquid ratio of 1:70, and react at 100°C for 120 minutes;

[0046] 3) After filtering and separating the solid-liquid mixture obtained in step 2, form a 1:20 solid-liquid mixture between the solid and deionized water and place it in a hydrothermal reaction kettle, add 2 mg / L of Fe 2+ and H 2 o 2 Fenton’s reagent with a mass fraction ratio of 1:5, wherein the Fenton’s reagent is prepared with ferrous chloride and 30% hydrogen peroxid...

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Abstract

The invention discloses a preparation method of shaddock peel hydrothermal carbon with a high specific surface area. The preparation method comprises the following steps: S1, drying biomass, and grinding to obtain biomass powder; s2, adding the biomass powder into a NaOH solution, and digesting; s3, after the solid-liquid mixture obtained in the step S2 is filtered and separated, forming the solid and deionized water to obtain a solid-liquid mixture with the ratio of 1: 10-1: 30, then placing the solid-liquid mixture in a hydrothermal reaction kettle, adding a Fenton reagent according to the concentration of 1-4 mg / L, performing a hydrothermal reaction for 8-12 h at the temperature of 160-200 DEG C, and filtering after cooling; s4, transferring the solid substance obtained in the step S3 into a container for solvent replacing; and S5, drying the solid substance obtained in the step S4 to obtain powdery biomass hydrothermal carbon, wherein the specific surface area of the biomass hydrothermal carbon is 110-230 m < 2 > / g. The biomass hydrothermal carbon with a good pore structure and a high specific surface area is prepared by adopting a green, environment-friendly and energy-saving method by taking cheap and renewable biomass as a precursor, and a reference is provided for high-valued utilization of waste biomass.

Description

technical field [0001] The application belongs to the technical field of preparation of hydrothermal carbon materials, and relates to a preparation method of biomass hydrothermal carbon, in particular to a preparation method of biomass hydrothermal carbon with a high specific surface area, and the biomass obtained by the preparation method Hydrocarbon. Background technique [0002] Grapefruit is one of the main fruits in my country, with an annual output of about 2.5 million tons. It is widely planted in southern regions such as Guangdong, Guangxi, and Fujian, and sold all over the country. After grapefruit is eaten or processed, the remaining waste grapefruit peel is about 600,000 tons per year, which will cause serious environmental pollution and resource waste if not properly disposed of. The structure of grapefruit peel is dense, with compact fibrous structure and a large number of pores, and contains a variety of hydroxyl groups and other groups, rich in organic carbon...

Claims

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Application Information

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IPC IPC(8): C01B32/05
CPCC01B32/05
Inventor 刘玉新徐嘉赛孙兵梁磊
Owner KUNMING UNIV OF SCI & TECH
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