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Nitrogen-doped mesoporous bamboo-based charcoal and application thereof

A technology of nitrogen doping and biochar, applied in the direction of alkali metal compounds, other chemical processes, alkali metal oxides/hydroxides, etc., can solve the problems of forming, limited specific surface area, poor pore structure, etc., and achieve the strength of finished products High, high desulfurization performance, low cost effect

Active Publication Date: 2020-03-31
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The technical problem to be solved by the present invention is that the current powdery biochar has disadvantages such as poor pore structure, limited specific surface area, and the need for molding.

Method used

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  • Nitrogen-doped mesoporous bamboo-based charcoal and application thereof
  • Nitrogen-doped mesoporous bamboo-based charcoal and application thereof
  • Nitrogen-doped mesoporous bamboo-based charcoal and application thereof

Examples

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preparation example Construction

[0032] Specifically, nitrogen-doped mesoporous bamboo-based biochar is prepared by the following method:

[0033] A. Cut waste bamboo chopsticks into bamboo segments, wash and dry, and then carbonize at high temperature in an inert atmosphere to obtain carbonized materials;

[0034] B. The carbonized material is calcined at low temperature in an oxidizing atmosphere to obtain the oxidized material;

[0035] C. Mix the oxidizing material with the urea solution for ultrasonic impregnation, then dehydration, high-temperature calcination in an inert atmosphere, and then cooling, washing and drying to obtain nitrogen-doped mesoporous bamboo-based biochar.

[0036] The raw material of the present invention is waste disposable bamboo chopsticks, which has a wide range of sources. In order to directly obtain shaped biochar after calcination, it does not need to be reprocessed and shaped like powdered biochar to be directly put into industrial application. It is cut into bamboo sections with a...

Embodiment 1

[0044] Cut the discarded bamboo chopsticks into bamboo segments with a length of about 1 cm and a diameter of about 0.5 cm, wash them with hot distilled water several times, put them in an oven, and dry them at 105°C for 24 hours. Weigh 40g of the pretreated bamboo section, place it in a tube furnace, and pass N at a flow rate of 150mL / min 2 30min in N 2 In the atmosphere, the temperature is increased to 800°C at a rate of 5°C / min, and carbonized for 2 hours to obtain a carbonized material;

[0045] Place the carbonized material in a tube furnace, blow in air at a flow rate of 150 mL / min, heat up from room temperature to 370 °C at a rate of 5 °C / min, and oxidize for 7 hours to obtain an oxidized material;

[0046] Dissolve urea in water and mix the urea solution with the oxidizing material at a mass ratio of 1:1. After ultrasonic immersion for 15 minutes, the suspension is evaporated to dryness at 80°C, and then the dehydrated sample is transferred to the tube In the furnace, at ro...

Embodiment 2

[0050] Cut the discarded bamboo chopsticks into bamboo segments with a length of about 1 cm and a diameter of about 0.5 cm, wash them with hot distilled water several times, put them in an oven, and dry them at 105°C for 24 hours. Weigh 40g of the pretreated bamboo section, place it in a tube furnace, and pass N at a flow rate of 150mL / min 2 30min in N 2 In the atmosphere, the temperature is increased to 800°C at a rate of 5°C / min, and carbonized for 2 hours to obtain a carbonized material;

[0051] Place the carbonized material in a tube furnace, blow in air at a flow rate of 150 mL / min, heat up from room temperature to 370 °C at a rate of 5 °C / min, and oxidize for 7 hours to obtain an oxidized material;

[0052] Dissolve urea in water and mix the urea solution with the oxidizing material at a mass ratio of 2:1. After ultrasonic immersion for 15 minutes, the suspension is evaporated to dryness at 80°C, and the dehydrated sample is transferred to the tube In the furnace, at room te...

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Abstract

The invention discloses nitrogen-doped mesoporous bamboo-based charcoal and application thereof, belonging to the technical field of biomass resource utilization. In order to obtain high-strength andhigh-activity charcoal which can be directly applied, the invention provides the nitrogen-doped mesoporous bamboo-based charcoal. A preparation method for the nitrogen-doped mesoporous bamboo-based charcoal comprsies the following steps: cutting waste bamboo chopsticks into bamboo sections, and successively carrying out washing, drying and carbonizing at a high temperature to obtain a carbonized material; calcining the carbonized material at a low temperature in an oxidizing atmosphere to obtain an oxidized material; and mixing the oxidized material with a urea solution, carrying out ultrasonic impregnation, and then successively performing dehydrating, high-temperature calcination, cooling, washing and drying. According to the invention, the waste disposable bamboo chopsticks are used asprecursors, and the steps of pretreatment, carbonization, air oxidation, urea nitrogen doping and the like are carried out; and the obtained bamboo-based charcoal is directly formed tubular charcoal,and has the advantages of wide raw material sources, low price and easy availability of the raw materials, easy operation, low energy consumption, low cost, high finished product strength, high desulfurization performance and the like.

Description

Technical field [0001] The invention belongs to the technical field of biomass resource utilization, and specifically relates to a novel nitrogen-doped mesoporous bamboo-based biochar and its application. Background technique [0002] my country is one of the central bamboo producing areas, and the consumption of disposable bamboo chopsticks is increasing year by year. In 2015, the consumption of disposable bamboo chopsticks in my country was about 23 billion pairs, an increase of 6.98% from the 21.5 billion pairs in 2014. A large number of discarded disposable bamboo chopsticks produced every year in my country are incinerated, resulting in air pollution and waste of biomass resources. Therefore, if waste bamboo chopsticks are used as raw materials to prepare biochar-based functional materials, it can not only create economic value, but also achieve the purpose of resource utilization of solid waste. [0003] At present, biochar-based functional materials have great application ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/02B01D53/86B01D53/52B01J20/20B01J20/28B01J20/30
CPCB01D53/02B01D53/8612B01J20/20B01J20/28083B01J20/02
Inventor 杨镇文江霞严浩丁陈琳
Owner SICHUAN UNIV
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