A kind of ball-milling oxidation-sulfhydrylation modified biochar and its preparation method and application

A technology of oxidation modification and biochar, which is applied in the direction of chemical instruments and methods, water pollutants, and other chemical processes, can solve the problems of low ball milling efficiency and easy generation of biochar solid dust, etc., to improve ball milling efficiency, equipment and The preparation process is economical and easy to realize, and the effect of shortening the ball milling time

Active Publication Date: 2021-10-22
NANKAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the ball milling method usually adopts mechanical dry milling, which has the disadvantages of low ball milling efficiency and easy generation of biochar solid dust during the separation process of biochar and grinding media; oxidation method usually uses strong oxidizing or corrosive substances such as concentrated sulfuric acid, concentrated Modification with nitric acid poses certain risks to the environment and the health of producers

Method used

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  • A kind of ball-milling oxidation-sulfhydrylation modified biochar and its preparation method and application
  • A kind of ball-milling oxidation-sulfhydrylation modified biochar and its preparation method and application

Examples

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Embodiment 1

[0035] (1) Collect dried animal manure and put it into the furnace. In this example, pig manure is used. Under anaerobic or anaerobic conditions, nitrogen can generally be used. First, the temperature is raised to the preset temperature at a rate of 2.5°C / min. , and pyrolysis and carbonization at a temperature of 500°C for 10 hours, and take it out after the temperature in the furnace is naturally cooled to room temperature;

[0036] (2) Take 3.0g of biochar prepared in step (1), put it in a ball mill tank, add 45g of hydrogen peroxide and 45g of water, and then add 200g of agate beads (agate beads are supporting equipment for the ball mill), and use a ball mill to grind the biochar to a particle size of Micro-nano level, preferably 0.1-10 microns, generally use a ball mill to mill at a speed of 100-250 rpm for 1-10 hours, in this embodiment, the speed is 250 rpm, ball mill for 3 hours, and collect the solid by suction filtration after ball milling Biochar modified by ball mil...

Embodiment 2

[0043] (1) Collect the dried stalks and put them into the furnace, heat up to the preset temperature at a rate of 5°C / min in a nitrogen atmosphere, and then pyrolyze and carbonize it at 600°C for 5 hours, and wait for the temperature in the furnace to cool naturally Take out after reaching room temperature;

[0044] (2) Take 3.0g of biochar prepared in step (1), put it in a ball mill tank, add 50g of hydrogen peroxide and 50g of water, and then add 200g of agate beads, and use a ball mill to grind the biochar to a micro-nano particle size, preferably to 0.1- 10 microns, generally use a ball mill to mill for 1-10 hours at a speed of 100-250 rpm, in this embodiment, the speed of rotation is 250 rpm, and the ball mill is 3 hours, after the ball milling, the solid biochar after ball milling oxidation modification is collected by suction filtration ;

[0045] (3) Take 1.0 g of the ball-milled oxidation-modified biochar prepared in step (2), put 50 g of 2% ethanol solution containi...

Embodiment 3

[0051] (1) Collect the dried animal feces and put them into the furnace. Under the nitrogen atmosphere, the temperature is first raised to the preset temperature at a rate of 10°C / min, and then pyrolyzed and carbonized at 700°C for 1 hour, and the temperature in the furnace is naturally Take out after cooling to room temperature;

[0052] (2) Take 3.0g of biochar prepared in step (1), put it in a ball mill tank, add 80g of hydrogen peroxide and 80g of water, and then add 200g of agate beads, and use a ball mill to grind the biochar to a micro-nanometer particle size, preferably to 0.1- 10 microns, generally use a ball mill to mill at a speed of 100-250 rpm for 1-10 hours, in this embodiment, the speed of rotation is 250 rpm, and the ball mill is for 5 hours. After the ball milling, the solid biochar after ball milling oxidation modification is collected by suction filtration ;

[0053] (3) Take 1.0 g of the ball-milled oxidation-modified biochar prepared in step (2), put 50 g...

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Abstract

The invention discloses a ball milling oxidation-mercapto-modified biochar and its preparation method and application. The preparation method comprises the following steps: (1) pyrolyzing the raw material to obtain biochar, and the raw material is produced in the process of agricultural production Crop stalks and / or animal manure produced during livestock breeding; (2) Mix biochar, hydrogen peroxide and water at a mass ratio of 1:15:15‑1:30:60, and ball mill the biochar particle size to micro Nanoscale, after filtering to obtain solid ball milling oxidation modified biochar; (3) adding the above ball milling oxidation modified biochar to 3-mercaptopropyl group containing 1%-4% according to the mass ratio of 1:20-1:200 The ethanol solution of trimethoxysilane is reacted and solidified after the reaction; (4) the solidified biochar is filtered and washed, and dried naturally to obtain ball milling oxidation-mercapto-modified biochar. The invention realizes resource recycling of agricultural and animal husbandry wastes, and the modified biochar can be used for removing heavy metals in water or fixing heavy metals in farmland soil.

Description

technical field [0001] The invention relates to the technical field of environmental protection, in particular to a ball milling oxidation-mercaptolation modified biochar and its preparation method and application. Background technique [0002] On the one hand, heavy metals are common pollutants, which are characterized by being easily absorbed, enriched, and transferred by organisms, and then biomagnified, and are not easily removed. Therefore, heavy metals, especially toxic heavy metals such as lead and cadmium, have been listed by countries all over the world. Prioritize the control of pollutants for the environment. Heavy metal pollution has become a global environmental problem, and in recent years it has become one of the pollution problems that Chinese people pay close attention to. my country is a large agricultural country, and agricultural production is one of the main economic industries in our country. Soil and water resources are the indispensable basis for agr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/20B01J20/30C02F1/28C02F101/20
CPCB01J20/20B01J20/3085B01J2220/4825B01J2220/4887C02F1/283C02F2101/20
Inventor 张鹏孙红文王菲
Owner NANKAI UNIV
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