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A kind of ramie fiber-based biochar and its preparation method and application

A ramie fiber and biochar technology, which is applied in the field of material science, can solve the problems of destroying the ultra-fine pore structure and fibrous morphology of ramie silk biochar, easily damaged structure and poor activation ability.

Active Publication Date: 2021-08-20
HUNAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing ramie biochar materials are mainly made of ramie leaves and ramie stem cores. These ramie biochar materials still have defects such as poor activation ability and poor anti-interference ability, which greatly limits the use of ramie biochar materials as persulfuric acid. Application of Salt Activator in Degradation of Organic Pollutants
In addition, so far, there has been no report on the use of ramie silk to prepare ramie silk biochar; at the same time, the existing modification methods for biochar (such as acid-base modification) cannot realize the improvement of fiber structure in ramie silk biochar. The effective separation between them can expose the active surface to the greatest extent, and the existing modification methods are also easy to destroy the structure of ramie silk biochar itself, which will destroy the special ultra-fine microporous structure and fibrous morphology inside the ramie silk biochar, thus It is difficult to prepare ramie fiber-based biochar composed of a complete strip-like fiber structure, which is not only not conducive to improving the specific surface area and the number of active sites of ramie silk biochar, but also not conducive to improving the electron transfer performance and catalytic activity of ramie silk biochar.
The existence of the above defects makes ramie silk biochar unable to effectively activate persulfate, making it difficult to achieve rapid degradation of organic pollutants in the environment

Method used

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  • A kind of ramie fiber-based biochar and its preparation method and application
  • A kind of ramie fiber-based biochar and its preparation method and application
  • A kind of ramie fiber-based biochar and its preparation method and application

Examples

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Effect test

Embodiment 1

[0046] A preparation method of ramie fiber-based biochar, comprising the following steps:

[0047] (1) Soak the ramie silk (commercially available) after natural air-drying to concentration and be 0.5wt% sodium carbonate (Na 2 CO 3 ) solution, heat to boil, keep at 105°C for 30 minutes to remove pectin, filter, wash, and dry.

[0048] (2) Transfer the dried biomass (ramie silk) in step (1) to a tube furnace, heat up to 500°C at a heating rate of 5°C / min under nitrogen for pyrolysis and carbonization, keep it for 2 hours, and cool , ground, and passed through a 100-mesh sieve to obtain ramie silk biochar, numbered B.

[0049] (3) According to the molar ratio of 1: 2, choline chloride and urea are added in the round bottom flask, and heated to 60 ° C under an oil bath until the solution is clear without any solid particles, and a deep eutectic solution (DESs) is obtained, namely It is the deep eutectic solvent in the present invention, and it is packed into a glass bottle wit...

Embodiment 2

[0068] An application of ramie fiber-based biochar in activating persulfate to degrade organic pollutants in water, specifically: using ramie fiber-based biochar to treat tetracycline wastewater, comprising the following steps:

[0069] (1) Take the ramie silk biochar (A) made in Comparative Example 1, the acid-modified ramie silk biochar (D) made in Comparative Example 2 and the ramie silk biochar (B) made in Example 1 , ramie fiber biochar (C), ramie fiber-based biochar (FB 500 , FB 700 and FB 900 ), each 10 mg, placed in a conical flask (250 mL) equipped with 100 mL, 20 mg / L tetracycline solution (the pH of the solution is 3.67), at this time the mass ratio of ramie fiber-based biochar to organic pollutants in water 5:1, the Erlenmeyer flask was placed in a vibrating shaker, the shaking speed was set to 150rpm, the temperature was 25°C, and the adsorption treatment was carried out for 30 minutes to reach the adsorption-desorption equilibrium.

[0070] (2) After the adsor...

Embodiment 3

[0078] An application of ramie fiber-based biochar in activating persulfate to degrade organic pollutants in water, specifically: using ramie fiber-based biochar to treat tetracycline wastewater, comprising the following steps:

[0079] (1) get 4 parts of ramie fiber-based biochars (FB) that make in embodiment 1 900 ), each portion of 10mg was placed in conical flasks (250mL) filled with tetracycline solutions (both volumes were 100mL and concentrations were 20mg / L) with initial pH values ​​of 3, 5, 7, and 9, respectively. The mass ratio of fiber-based biochar to organic pollutants in water is 5:1. The Erlenmeyer flask is placed in a vibrating shaker with a shaking speed of 150 rpm and a temperature of 25°C. The adsorption treatment is carried out for 30 minutes to reach adsorption and desorption equilibrium.

[0080] (2) After the adsorption and analysis balance, keep the shaking speed at 150rpm and the temperature at 25°C, add 23.8mg sodium persulfate (PS) in the conical fla...

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Abstract

The invention discloses a ramie fiber-based biochar and its preparation method and application. The preparation method of the ramie fiber-based biochar comprises the following steps: using ramie silk as a raw material to prepare ramie silk biochar, mixing it with a deep eutectic solvent, Ultrasonic dispersion, hydrothermal reaction, and pyrolytic carbonization of the obtained ramie fiber biochar to obtain ramie fiber-based biochar. The ramie fiber-based biochar prepared by the present invention has the advantages of large specific surface area, high degree of graphitization, good electron transfer performance, high catalytic activity, etc. It is a new biochar material composed of ramie fiber structure, and its preparation method has the advantages of simple process , strong operability and other advantages, it is suitable for large-scale preparation and is beneficial to wide application. The ramie fiber-based biochar of the present invention can be used as an activator to activate persulfate to degrade organic pollutants in water bodies, and can effectively degrade organic pollutants. It has the advantages of simple operation, high treatment efficiency, strong stability, etc., and has high use value. , the application prospect is good.

Description

technical field [0001] The invention belongs to the fields of material science and pollutant treatment, and relates to a ramie fiber-based biochar, a preparation method and application thereof. Background technique [0002] With the rapid development of industrialization and agriculturalization, more and more organic pollutants are discharged into natural water bodies, seriously affecting the quality of water bodies and the balance of aquatic ecological environment. Due to their strong hydrophobicity, organic pollutants are easy to remain and accumulate in the environment and organisms, and even enrich and amplify through the food chain, affecting the healthy life of human beings and causing irreparable damage to the environment. At present, the commonly used treatment methods include adsorption method, membrane separation method, biodegradation method, etc., but these methods have the disadvantages of complex process operation, high equipment requirements, low efficiency, i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/20B01J20/28B01J20/30B01J27/24B01J35/10C02F1/28C02F1/72C02F101/30
CPCB01J20/20B01J20/28057B01J27/24C02F1/283C02F1/725C02F2101/30B01J35/61
Inventor 叶淑静曾光明谭小飞武海鹏杨海澜陈强杜立汪文军向玲
Owner HUNAN UNIV
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