Ball-milling oxidation-sulfhydrylation modified biochar, and preparation method and application thereof

A technology of oxidation modification and biochar, applied in the direction of chemical instruments and methods, water pollutants, and other chemical processes, can solve the problems of easy generation of biochar solid dust and low efficiency of ball milling, and achieve economical and easy equipment and preparation process Realize and improve the efficiency of ball milling and simplify the operation steps

Active Publication Date: 2020-01-03
NANKAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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  • Ball-milling oxidation-sulfhydrylation modified biochar, and preparation method and application thereof
  • Ball-milling oxidation-sulfhydrylation modified biochar, and preparation method and application thereof

Examples

Experimental program
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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-sulfhydrylation modified biochar, and a preparation method and an application thereof. The preparation method comprises the following steps: (1) a rawmaterial is pyrolyzed to obtain biochar, wherein the raw material is crop straws generated in the agricultural production process and / or animal wastes generated in the livestock and poultry breeding process; (2) biochar, hydrogen peroxide and water are mixed according to a mass ratio of 1:15:15 to 1:30:60, the obtained mixture is ball-milled to make the particle size of the biochar reaches a micro-nano level, and the ball-milled mixture is filtered to obtain solid ball-milled oxidation modified biochar; (3) the ball-milled oxidation modified biochar is added into an ethanol solution containing1-4% of 3-mercaptopropyltrimethoxysilane according to a mass ratio of 1:20 to 1:200, a reaction is carried out, and curing is performed after the reaction; and (4) the cured biochar is subjected to suction filtration, washing and natural airing to obtain the ball-milled oxidation-sulfhydrylation modified biochar. Resource recycling of agricultural and animal husbandry wastes is achieved, and themodified 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 Applications(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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