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Straw modified biochar as well as preparation method and application thereof

A biochar modification technology, applied in the field of environmental restoration, can solve problems such as low utilization rate, environmental pollution, waste of resources, etc., and achieve the effects of improving adsorption capacity, simplifying preparation steps, good promotion and use value

Pending Publication Date: 2021-04-30
SOUTH UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Many agricultural waste resources such as rice straw, rape straw, corn straw, and chaff can be used as raw materials for the preparation of biochar. Such resources are abundant, low in cost, and environmentally friendly, but their utilization rate is extremely low, and most of them are used as cheap fuels. Incineration or random discharge not only causes waste of resources, but also produces serious environmental pollution

Method used

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  • Straw modified biochar as well as preparation method and application thereof
  • Straw modified biochar as well as preparation method and application thereof
  • Straw modified biochar as well as preparation method and application thereof

Examples

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Embodiment 1

[0032] This example is used to illustrate a straw modified biochar disclosed in the present invention.

[0033] Dry the rice straw at 105°C for 24 hours, pass through a 100-mesh nylon sieve for later use;

[0034] Mix rice straw powder and calcium hydroxide powder in a mortar with a mass ratio of 4:1, put them into a tube furnace, and pass nitrogen gas through the tube furnace for 30 minutes. The temperature was raised to 500°C at a rate of 1 / min, then kept at a constant temperature for 1.5h, and then cooled to room temperature.

Embodiment 2

[0036] This example is used to illustrate a straw modified biochar disclosed in the present invention.

[0037] Dry the rice straw at 110°C for 24 hours, pass through a 100-mesh nylon sieve for later use;

[0038] Mix rice straw powder and calcium hydroxide powder in a mortar with a mass ratio of 3:1, put them into a tube furnace, and pass nitrogen gas through the tube furnace for 30 minutes. The temperature was raised to 500°C at a rate of 1 / min, then kept at a constant temperature for 1.5h, and then cooled to room temperature.

Embodiment 3

[0040] This example is used to illustrate a straw modified biochar disclosed in the present invention.

[0041] Dry the rice straw at 100°C for 24 hours and pass it through a 100-mesh nylon sieve for later use;

[0042] Mix rice straw powder and calcium hydroxide powder in a mortar with a mass ratio of 5:1, put them into a tube furnace, pass nitrogen gas for 30 minutes in the tube furnace, and ventilate the air at 5°C The temperature was raised to 500°C at a rate of 1 / min, then kept at a constant temperature for 1.5h, and then cooled to room temperature.

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Abstract

The invention provides straw modified charcoal as well as a preparation method and application thereof in treatment of lead pollutants. The preparation method comprises the following steps: crushing, drying and sieving rice straw to prepare rice straw powder; and mechanically and uniformly mixing the rice straw powder with powdery calcium hydroxide, and carrying out pyrolysis, constant-temperature treatment and cooling under an anoxic condition to obtain the straw modified biochar, wherein the adsorption rate of the straw modified biochar to lead in wastewater is greater than 99%, lead in the bottom mud is reduced to below 5mg / L of the national standard within 18h, and the lead in the bottom mud can be cured for a long time. According to the invention, the preparation steps of the biochar are simplified, and the provided straw modified biochar is an ideal low-cost water body and bottom mud heavy metal pollution repairing agent and has very good popularization and use values.

Description

technical field [0001] The invention belongs to the field of environmental restoration, and in particular relates to the application of straw-modified biochar for absorbing lead in water bodies or solidified bottom mud. Background technique [0002] Due to the discharge of industrial pollution and human activities, lead pollution has become an important environmental problem in water bodies and sediments, and has had a serious impact on the ecological environment. Therefore, it is necessary to effectively control and remediate pollutants. [0003] In recent years, biochar has been extensively studied as an adsorbent for pollutants in wastewater. Biochar is a kind of highly aromatized refractory polymer produced by pyrolysis and carbonization of agricultural waste under anaerobic conditions. It has a strong adsorption effect on heavy metals, but the removal efficiency is limited, and biochar is usually improved. to enhance its ability to remove pollutants. The modified bio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/30C02F1/28C02F11/00C02F101/20
CPCB01J20/041B01J20/20C02F1/283C02F11/008B01J2220/4887C02F2101/20
Inventor 唐圆圆刘云松刘越
Owner SOUTH UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA