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Alkali-modified pig manure biochar and preparation method and application thereof

A biochar and alkali modification technology, applied in chemical instruments and methods, water pollutants, other chemical processes, etc., can solve the problems of inability to remove pollution in a timely and effective manner, small specific surface area of ​​original biochar, and low removal efficiency, etc. Achieve good application value, realize resource utilization, and shorten the effect of balancing time

Active Publication Date: 2018-06-12
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the original biochar has the following problems in the process of use: First, it takes a certain amount of time for the original biochar to reach an adsorption equilibrium for heavy metals and achieve a high adsorption effect, so it cannot remove pollution in the environment in a timely and effective manner
Second, the specific surface area of ​​raw biochar is relatively small and the pore volume is relatively small, so the removal efficiency is not high

Method used

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  • Alkali-modified pig manure biochar and preparation method and application thereof
  • Alkali-modified pig manure biochar and preparation method and application thereof
  • Alkali-modified pig manure biochar and preparation method and application thereof

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Embodiment 1

[0031] The alkali-modified pig manure biochar of the present invention is mainly prepared by pyrolysis of pig manure to obtain pig manure biochar, and the pig manure biochar is modified by potassium hydroxide solution.

[0032] A preparation method of the alkali-modified pig manure biochar of the present invention includes the following steps:

[0033] (1) Preparation of pig manure biochar: collect fresh pig manure, dry at 60°C to a moisture content of 10%-15%, crush, pass through a 100-mesh sieve, and store it in a sealed container for later use. Put the crushed and sieved pig manure into a tube furnace, blow in nitrogen, and pyrolyze at a high temperature, the heating rate is 8℃ / min, the pyrolysis temperature is 300℃, the pyrolysis residence time is 2h, and it is cooled to room temperature. Crush and pass a 100-mesh sieve to prepare pig manure biochar.

[0034] (2) Preparation of KOH solution: Weigh 5.61g KOH into a beaker, add an appropriate amount of ultrapure water to dissolve ...

Embodiment 2

[0038] A preparation method of the alkali-modified pig manure biochar of the present invention includes the following steps:

[0039] (1) Preparation of pig manure biochar: collect fresh pig manure, dry at 60°C to a moisture content of 10%-15%, crush, pass through a 100-mesh sieve, and store it in a sealed container for later use. Put the crushed and sieved pig manure into a tube furnace, blow in nitrogen, and pyrolyze at a high temperature. The heating rate is 8°C / min, the pyrolysis temperature is 500°C, and the pyrolysis residence time is 2h. Cool to room temperature and grind. Smash and pass a 100-mesh sieve to obtain pig manure biochar.

[0040] (2) Preparation of KOH solution: Weigh 5.61g KOH into a beaker, add an appropriate amount of ultrapure water to dissolve and transfer to a 50mL volumetric flask, dilute to the mark with ultrapure water, shake well, and you will get 2.0mol / L KOH solution.

[0041] (3) Preparation of alkali-modified pig manure biochar: 5g biochar was adde...

Embodiment 3

[0045] A preparation method of the alkali-modified pig manure biochar of the present invention includes the following steps:

[0046] (1) Preparation of pig manure biochar: collect fresh pig manure, dry at 60°C to a moisture content of 10%-15%, crush, pass through a 100-mesh sieve, and store it in a sealed container for later use. Put the crushed and sieved pig manure into a tube furnace, blow in nitrogen, and pyrolyze at a high temperature. The heating rate is 8°C / min, the pyrolysis temperature is 700°C, the pyrolysis residence time is 2h, and it is cooled to room temperature. Crush and pass a 100-mesh sieve to prepare pig manure biochar.

[0047] (2) Preparation of KOH solution: Weigh 5.61g KOH into a beaker, add an appropriate amount of ultrapure water to dissolve and transfer to a 50mL volumetric flask, dilute to the mark with ultrapure water, shake well, and you will get 2.0mol / L KOH solution.

[0048] (3) Preparation of alkali-modified biochar: Add 5g of biochar to 50mL of 2m...

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Abstract

The invention discloses alkali-modified pig manure biochar and a preparation method and application thereof. The preparation method of the alkali-modified pig manure biochar comprises: (1) pyrolyzingpretreated pig manure in nitrogen at 300-700 DEG C, during which the temperature increasing rate is 8-12 DEG C / min and the pyrolysis time is 2 h-4 h, and performing cooling, crushing and sieving to obtain pig manure biochar; (2) mixing the biochar with potassium hydroxide solution, stirring the mixture for reaction at a reaction temperature of 90-100 DEG C and a stirring speed of 867-1300 r / min for 12 h-24 h, and then performing filtering, washing and drying to obtain the alkali-modified pig manure biochar. The alkali-modified pig manure biochar is large in specific surface area and pore area,greatly shortens the absorption equilibrium time, achieves high capacity of removing lead in waters, and meanwhile, is simple in preparation process and low in cost and has a broad application prospect.

Description

Technical field [0001] The invention belongs to the new technical field of environmental functional materials and water treatment, and relates to an alkali-modified pig manure biochar and a preparation method and application thereof, in particular to an alkali-modified pig manure biochar, a preparation method thereof, and lead removal from water bodies. Applications. Background technique [0002] Lead is a very toxic heavy metal. Due to lead-containing wastewater, waste gas and slag discharged from industrial production processes such as mining, smelting, petroleum refining, storage batteries, glass, paint, coatings, medicine, and ships, lead and its compounds are increasingly polluting the environment. It can affect various organs such as nerves, hematopoiesis, digestion, urinary, reproduction and development, cardiovascular, endocrine, immunity, bones, etc. The main target organs are the nervous system and hematopoietic system. What is more serious is that it affects the grow...

Claims

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Application Information

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IPC IPC(8): B01J20/20B01J20/30C02F1/28C02F101/20
CPCB01J20/20C02F1/281C02F2101/20
Inventor 黄丹莲王荣忠曾光明张辰刘云国赖萃龚小敏万佳薛文静张青罗浩
Owner HUNAN UNIV
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