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Modified biochar as well as preparation method and application thereof

A biochar, modified technology, used in chemical instruments and methods, water pollutants, other chemical processes, etc., can solve problems such as increasing production costs, corroding machines, and limiting the scope of application

Pending Publication Date: 2022-05-06
AGRO ENVIRONMENTAL PROTECTION INST OF MIN OF AGRI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the low pH conditions Ca 2+ with PO 4 3- The binding will be inhibited, so the adsorption capacity is poor, which limits its application range
And usually the Ca source starts with Ca 2+ When loaded in the form of biochar, a large amount of strong acid is needed to dissolve the Ca source. Strong acid is very corrosive and expensive. In actual production, it will corrode the machine and increase the preparation cost.

Method used

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  • Modified biochar as well as preparation method and application thereof
  • Modified biochar as well as preparation method and application thereof
  • Modified biochar as well as preparation method and application thereof

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preparation example Construction

[0030] The invention provides a kind of preparation method of modified biochar, comprising the following steps:

[0031] Under the condition of isolating the air, the agricultural waste is first calcined to obtain the biochar substrate;

[0032] The waste containing Ca source is subjected to the second calcination and mixed with water to obtain Ca(OH) 2 suspension;

[0033] Place the biochar substrate in the Ca(OH) 2 The suspension is impregnated to obtain the modified biochar.

[0034] In the invention, the agricultural waste is first calcined under the air-isolated condition to obtain the biochar base material. In the present invention, the agricultural waste preferably includes at least one of tobacco stalks, straws and walnut shells, more preferably tobacco stalks. In the present invention, the agricultural waste preferably includes pretreatment before the first calcination; the pretreatment preferably includes: washing, air-drying and pulverizing the agricultural wast...

Embodiment 1

[0054] Put 70g of the sieved tobacco stalks in the crucible, cover it to isolate the air, raise the temperature in the muffle furnace to 500°C at a rate of 5°C / min, and keep it warm for 2h to obtain the biochar substrate;

[0055] Put 20g of sieved oyster shells in a crucible, raise the temperature in a tube furnace to 1000°C at a rate of 5°C / min, and keep it warm for 1h; take 10g of calcined oyster shells and dissolve them in 500mL of water, and ultrasonicate for 1.5h , to get Ca(OH) 2 suspension;

[0056] 20g of the biochar substrate was added to the Ca(OH) 2 In the suspension, stir evenly, stir at 800rpm in a constant temperature magnetic stirrer for 6h at room temperature, transfer to an oven at 105°C, dry to remove moisture, and obtain loaded Ca(OH) 2 modified biochar named Ca-BC.

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Abstract

The invention provides modified biochar as well as a preparation method and application thereof, and relates to the technical field of adsorption materials. The preparation method of the modified biochar provided by the invention comprises the following steps: under an air isolation condition, performing first calcination on agricultural wastes to obtain a biochar base material; carrying out secondary calcination on the Ca source-containing waste, and mixing with water to obtain Ca (OH) 2 suspension; and placing the biochar base material in the Ca (OH) 2 suspension, and dipping to obtain the modified biochar. According to the prepared modified biochar, under the initial pH acidic condition, Ca (OH) 2 on the surface is preferentially subjected to an acid-base neutralization reaction with H < + > in a solution, the modified biochar and phosphate are subjected to chemical precipitation under the slightly alkaline condition, and compared with other Ca-loaded biochar, the adsorption capacity is improved by 3-15 times.

Description

technical field [0001] The invention relates to the technical field of adsorption materials, in particular to a modified biochar and its preparation method and application. Background technique [0002] Phosphorus (P) is one of the three major nutrients (N, P, K) necessary for plant growth, and plays a pivotal role in maintaining crop growth and increasing food production. But on the other hand, excessive phosphorus flowing into the water will cause eutrophication, resulting in hypoxia in the water body, death of aquatic animals and plants, damage to water quality, causing economic losses in the region and even threatening human health. [0003] Among various separation methods of phosphate in aqueous phase, adsorption method is considered to be a promising method due to its simple operation, environmental friendliness and high removal rate. The development of inexpensive materials with excellent adsorption properties has become a research focus. Phosphate ion acts as a Le...

Claims

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Application Information

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IPC IPC(8): B01J20/20B01J20/32C02F1/28C02F1/52C02F1/66C02F101/10
CPCB01J20/041B01J20/20B01J20/3234C02F1/283C02F1/5236C02F1/66C02F2101/105
Inventor 王风冯梦晗罗元张克强
Owner AGRO ENVIRONMENTAL PROTECTION INST OF MIN OF AGRI
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