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Magnesium salt modified charcoal and application thereof

A biochar, modified technology, applied in water pollutants, other chemical processes, water/sludge/sewage treatment, etc., can solve problems such as heavy metal environmental risks, and achieve the goal of being beneficial to water pollution control, improving treatment efficiency, reducing The effects of dealing with stress

Pending Publication Date: 2018-11-13
NORTHWEST A & F UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the heavy metal ions loaded on its modified biochar have potential environmental risks of heavy metals in the soil.
CN 105854805 A proposes to use Zaili pollen as a raw material to prepare modified biochar, and then use sodium alginate as an embedding agent to make biochar microspheres to remove phosphorus from water. However, due to restrictions on the origin of raw materials and pollen production, no other Agricultural and forestry waste

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0019] The present invention provides a kind of step of the preparation method of magnesium salt modified biochar as follows:

[0020] A magnesium salt modified biochar, characterized in that: the preparation method of the magnesium salt modified biochar is:

[0021] 1) For the pretreatment of raw materials, select agricultural and forestry wastes, soak them in sodium hydroxide solution, wash them with distilled water until they are neutral, dry them at 80-105°C, and crush them until the particle size is less than 2 mm;

[0022] 2) Preparation of magnesium salt modified biochar: preparation of magnesium salt modified biochar: immerse the product obtained in step 1) and magnesium chloride solution in the magnesium chloride solution at a mass volume ratio of 1:15-1:25 g / ml 1-12 h, then sonicate for 0.5-1 h, and dry at 80-105°C;

[0023] 3) The product obtained in step 2 was pyrolyzed under nitrogen atmosphere to prepare magnesium salt modified biochar.

[0024] The agricultura...

Embodiment 1

[0029] The collected agricultural and forestry waste straws were soaked in 0.5 mol / L sodium hydroxide for 1 h, rinsed with distilled water until neutral, dried and crushed to a particle size of less than 2 mm, and then the crushed raw materials were dissolved in 0.6 mol / L magnesium chloride solution to The mass volume ratio is 1:20g / ml soaked for 12 hours, then ultrasonicated for 1 hour, and dried at 80-105 °C.

[0030] The dried raw materials were placed in a crucible and raised to 550 °C at a heating rate of 10 °C / min, kept for 5 h, cooled to room temperature naturally, and then taken out. Further, it was ground and passed through a 0.12 mm nylon mesh sieve to complete the preparation to obtain the magnesium salt modified biochar.

[0031] Application effect: The magnesium salt modified biochar prepared above is added to the aqueous solution containing high ammonium nitrogen (1000 mg / L) and nitrate nitrogen (100 mg / L), and the pH is in the range of 3-9 , with a dosing conce...

Embodiment 2

[0033] The collected agricultural and forestry waste straws were soaked in 0.6 mol / L sodium hydroxide for 0.5 h, rinsed with distilled water until neutral, dried and crushed to a particle size of less than 2 mm, and then the crushed raw materials were mixed with 0.5 mol / L magnesium chloride solution Soak for 12 h at a mass volume ratio of 1:15 g / ml, then sonicate for 1 h, and dry at 80-105 °C.

[0034] The dried raw materials were placed in a crucible and raised to 500 °C at a rate of 10 °C / min, kept for 5 h, cooled to room temperature naturally, and taken out. Further, it was ground and passed through a 0.12 mm nylon mesh sieve to complete the preparation to obtain the magnesium salt modified biochar.

[0035] Application effect: The magnesium salt modified biochar prepared above is added to the aqueous solution containing high ammonium nitrogen (1000 mg / L) and nitrate nitrogen (100 mg / L), and the pH is in the range of 3-9 , with a dosing concentration of 5 g / L, placed on a ...

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Abstract

The invention belongs to the technical field of biological environment protection, and particularly relates to magnesium salt modified charcoal and an application thereof. The magnesium salt modifiedcharcoal is simple to operate and low in manufacture cost, large-scale industrialization production can be achieved, and water environment pollution is managed and controlled. A preparation method ofthe magnesium salt modified charcoal includes the steps: 1) pretreating raw materials, selecting agricultural and forest residues, placing the agricultural and forest residues into sodium hydroxide solution to soak the agricultural and forest residues, washing the agricultural and forest residues by distilled water until the agricultural and forest residues reach neutral, drying the washed agricultural and forest residues at the temperature of 80-105 DEG C, crushing the dried agricultural and forest residues, and enabling the particle diameter of the crushed agricultural and forest residues tobe smaller than 2mm; 2) magnesium salt modified charcoal preparation: soaking a product acquired in the step 1) into magnesium chloride solution for 1-12h, performing ultrasound on mixture for 0.5-1h, drying the mixture at the temperature of 80-105 DEG C; 3) performing pyrolysis on a product acquired in the step 2) in nitrogen atmosphere to prepare the magnesium salt modified charcoal. The mass volume ratio of the product to the magnesium chloride solution is 1:15-1:25g / ml.

Description

1. Technical field: [0001] The invention belongs to the technical field of biological environmental protection, and in particular relates to a magnesium salt modified biochar and its application. 2. Background technology: [0002] At present, water resources are increasingly scarce, and attention to comprehensive treatment of polluted water bodies and water environment restoration is increasing year by year. Among them, due to the excessive use of nitrogen fertilizers in agricultural production and the wanton discharge of sewage in daily life and industrial production, the concentration of nitrate nitrogen and ammonium nitrogen in groundwater and surface water bodies has increased abnormally rapidly, and the problem of water eutrophication has become increasingly serious. A large amount of ammonia nitrogen in the water environment will increase the consumption of dissolved oxygen and endanger the life activities of aquatic organisms. Nitrate not only inhibits the growth of ...

Claims

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Application Information

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IPC IPC(8): B01J20/20C02F1/28B01J20/30
CPCB01J20/046B01J20/20B01J2220/485C02F1/283C02F2101/16C02F2101/163
Inventor 张增强赵军超李荣华木开石王权任秀娜
Owner NORTHWEST A & F UNIV
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