A kind of magnesium-loaded biochar and its preparation method and application

A biochar, magnesium chloride technology, applied in chemical instruments and methods, water pollutants, other chemical processes, etc., to achieve the effects of low cost, simple operation, and strong arsenic adsorption capacity

Active Publication Date: 2020-04-24
BEIJING ACADEMY OF AGRICULTURE & FORESTRY SCIENCES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the fact that there is currently no effective restoration agent capable of adsorbing cadmium and arsenic at the same time, the present invention provides a magnesium-loaded biochar

Method used

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  • A kind of magnesium-loaded biochar and its preparation method and application
  • A kind of magnesium-loaded biochar and its preparation method and application
  • A kind of magnesium-loaded biochar and its preparation method and application

Examples

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Comparison scheme
Effect test

Embodiment 1

[0025] Embodiment 1 A kind of magnesium-loaded biochar

[0026] This example provides a magnesium-loaded biochar, which is prepared by the following method: dry and pulverize rice straw that has passed through a 2mm sieve and MgCl with a concentration of 0.5mol / L 2 The solutions are mixed, and the ratio of impregnation solution to biomass is 200mL:20g. After soaking for 0.5h, sonicate for 2h, and dry at 80°C.

[0027] Put it into a stainless steel tank with a diameter of 5 cm and a height of 8 cm, compact it and cover it, place it in a box-type electric furnace, raise the temperature to 500 °C at a heating rate of 20 °C / min, keep it for 4 hours, cool to room temperature and take it out.

[0028] The prepared material was filtered and washed 10 times with deionized water, dried at 80°C, and then ground through a 100-mesh sieve to obtain the magnesium-loaded biochar composite material BC-Mg0.5.

Embodiment 2

[0029] Embodiment 2 A kind of magnesium-loaded biochar

[0030] This example provides a magnesium-loaded biochar, which is prepared by the following method: dry and pulverize rice straw that has passed through a 2mm sieve and MgCl with a concentration of 2.0mol / L 2 The solutions are mixed, and the ratio of impregnation solution to biomass is 200mL:20g. After soaking for 0.5h, sonicate for 2h, and dry at 80°C.

[0031] Put it into a stainless steel tank with a diameter of 5 cm and a height of 8 cm, compact it and cover it, place it in a box-type electric furnace, raise the temperature to 500 °C at a heating rate of 20 °C / min, keep it for 4 hours, cool to room temperature and take it out.

[0032] The prepared material was filtered and washed 15 times with deionized water, dried at 80°C, and then ground through a 100-mesh sieve to obtain the magnesium-loaded biochar composite material BC-Mg2.0.

[0033] Effect verification

[0034] 1. Physical and chemical properties of adsor...

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Abstract

The invention relates to magnesium-loaded biological carbon as well as a preparation method and application thereof. The preparation method of the magnesium-loaded biological carbon comprises the following steps: immersing crushed agricultural and forestry wastes into a magnesium chloride solution; carrying out ultrasonic treatment; after drying, firing under anaerobic conditions. According to the magnesium-loaded biological carbon provided by the invention, an adsorption capability of pure biological carbon on cadmium can be improved and arsenic can also be effectively adsorbed. The magnesium-loaded biological carbon not only can be used for purifying cadmium and arsenic polluted water bodies, but also can be used for passivating the arsenic and the cadmium in soil so that the mobility and effectiveness of the cadmium and the arsenic are reduced.

Description

technical field [0001] The invention relates to a magnesium-loaded biochar, a preparation method and application thereof, and belongs to the technical field of heavy metal pollution control. Background technique [0002] my country's farmland soil is seriously polluted by heavy metals, and most of them are complex pollutions of multiple heavy metals coexisting. The first soil pollution survey bulletin shows that the soil excess rate of Cd and As ranks first and third. On the one hand, sewage irrigation containing As and Cd is one of the causes of soil pollution. On the other hand, heavy metals in contaminated soil can enter water bodies through surface runoff, causing heavy metal pollution in water. Heavy metal pollution such as As and Cd seriously threatens human food safety and health. [0003] As a new type of repair material, biochar has a large specific surface area, good porosity, rich in oxygen-rich functional groups, and good stability. It can effectively adsorb and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/20B01J20/30C02F1/28B09C1/08C02F101/20C02F101/10
CPCB01J20/041B01J20/20B09C1/08C02F1/281C02F1/283C02F2101/103C02F2101/20
Inventor 郑瑞伦江荣风王正行孙国新朱毅侯新村
Owner BEIJING ACADEMY OF AGRICULTURE & FORESTRY SCIENCES
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