Biological carbon prepared from tobacco stems as well as preparation method and application thereof

A technology of biochar and tobacco stems, applied in the field of agricultural chemistry, can solve the problems of strains that are difficult to decompose and cannot be returned to the field on the spot, and achieve the effects of strong adsorption capacity, large specific surface area, and full utilization of resources

Inactive Publication Date: 2016-09-07
HUNAN AGRICULTURAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, tobacco stems contain a large amount of lignin, cellulose and nicotine, which are difficult for ordinary strains to decompose and cannot be returned to the field

Method used

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  • Biological carbon prepared from tobacco stems as well as preparation method and application thereof
  • Biological carbon prepared from tobacco stems as well as preparation method and application thereof
  • Biological carbon prepared from tobacco stems as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] After the tobacco stem waste is pulverized, select 60-mesh granules, stir 5g of tobacco stem (granule) biomass with 60ml of deionized water according to the ratio of solid-liquid ratio of 1g: 12ml, and then seal them into an autoclave. Under the condition that the heating rate of the electric furnace is 10-20°C / min, conduct hydrothermal carbonization at 180°C for 5 hours, wash with deionized water until neutral after natural cooling, filter with suction, dry at 70°C for 10 hours, and grind to obtain tobacco stems biochar material. Mix the obtained tobacco stem biochar with KOH activator aqueous solution (KOH mole percentage is 5 mol%) at a ratio of 1:4 (solid / liquid weight ratio) and activate it for 2 hours. After drying, it is calcined at 400°C for 2 hours under the protection of nitrogen, and cooled naturally. Afterwards, it was washed with deionized water until neutral, and the biochar was obtained after drying. The SEM image of the prepared biochar is shown in fig...

Embodiment 2

[0052] After the tobacco stem waste is pulverized, select 60-mesh particles, stir 5g of tobacco stem biomass and 60ml of deionized water according to the ratio of solid-to-liquid ratio of 1g: 12ml, and then seal them into a high-pressure reactor. Under the condition of 10-20°C / min, conduct hydrothermal carbonization at 180°C for 5 hours, wash with deionized water until neutral after natural cooling, filter with suction, dry at 70°C for 10 hours, and grind to obtain tobacco stem biochar material . To obtain tobacco stem biochar with K 2 CO 3 Activator aqueous solution (K 2 CO 3 The mole percentage is 5mol%) mixed with 1:4 ratio (solid / liquid weight ratio) and activated for 2h, dried and calcined at 400°C for 2h under nitrogen protection, cleaned with deionized water to neutral after natural cooling, and dried Get biochar. The SEM image of the prepared biochar is shown in figure 2 .

[0053] The particle size of the prepared biochar is 0.6 μm, and the specific surface ar...

Embodiment 3

[0055] After the tobacco stem waste is pulverized, select 60-mesh particles, stir 5g of tobacco stem biomass and 60ml of deionized water according to the ratio of solid-to-liquid ratio of 1g: 12ml, and then seal them into a high-pressure reactor. Under the condition of 10-20°C / min, conduct hydrothermal carbonization at 180°C for 5 hours, wash with deionized water until neutral after natural cooling, filter with suction, dry at 70°C for 10 hours, and grind to obtain tobacco stem biochar material . Mix the obtained tobacco stem biochar with KOH activator aqueous solution (KOH mole percentage is 5 mol%) at a ratio of 1:4 (solid / liquid weight ratio) and activate it for 2 hours. After drying, it is calcined at 600°C for 2 hours under the protection of nitrogen, and cooled naturally. Afterwards, it was washed with deionized water until neutral, and the biochar was obtained after drying. The SEM image of the prepared biochar is shown in image 3 .

[0056] The particle size of the...

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Abstract

The invention discloses a method for preparing biological carbon from tobacco stems. The method for preparing the biological carbon from the tobacco stems comprises the following steps: (1), crushing the tobacco stems, and then enabling the crushed tobacco stems and water to be subjected to a hydrothermal carbonization reaction at 180-260 DEG C; after terminating the reaction, filtering, washing and drying an obtained product in sequence; (2), activating the product, which is dried in Step (1), by an activating agent, afterwards, calcining the activated product at 400-1200 DEG C in an inert atmosphere, and subsequently, washing the calcined product with water, drying the water-washed product, and obtaining the biological carbon. The activating agent is at least one of a lewis acid, a peroxide, an alkali metal hydroxide and an alkali metal carbonate. The invention also discloses the biological carbon prepared by adopting the method and application of the biological carbon to the adsorption of heavy metal. An obtained biological carbon material has advantages of relatively small particle sizes, relatively large specific surface area, relatively strong adsorption capacity and the like, and can be applied to the adsorption and the repair of heavy metal ions in a water body and a soil environment.

Description

technical field [0001] The invention relates to the field of agricultural chemistry, in particular to biochar prepared from tobacco stems, a preparation method and application thereof. Background technique [0002] In recent years, the situation of heavy metal pollution has become increasingly severe, especially the pollution in soil and water bodies, which endangers the safe production and utilization of food and poses a serious threat to human survival and development. The preparation of functionalized biochar from biomass raw materials can be used to control and remediate heavy metal pollution. [0003] my country is a big tobacco producing country, and its annual tobacco production is about 42% of the world's. In the domestic economic system, the fiscal and tax value generated by tobacco occupies an important weight in the total economic value of the country. Tobacco stems are a by-product of the tobacco industry, and hundreds of thousands of tons of tobacco stem resou...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/30C02F1/28
CPCB01J20/20C02F1/281
Inventor 周南周智邓仲华
Owner HUNAN AGRICULTURAL UNIV
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