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Composite modified biochar preparation method

A technology of composite modification and biochar, applied in the direction of alkali metal compounds, chemical instruments and methods, water pollutants, etc., can solve problems such as self-purification, strong toxicity of cadmium, threat to human health and safety, etc., to achieve abundant quantity and types, improving adsorption efficiency, and expanding the effect of pore structure

Pending Publication Date: 2019-12-20
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Cadmium-containing wastewater is one of the most harmful heavy metal wastewater. Cadmium is extremely toxic and cannot be removed through water self-purification, which seriously threatens human health and safety.

Method used

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  • Composite modified biochar preparation method
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  • Composite modified biochar preparation method

Examples

Experimental program
Comparison scheme
Effect test

experiment example 1

[0037] Effect of different carbonization temperatures on biochar adsorption.

[0038] (1) Preparation of wheat straw biochar: Wheat straw was air-dried for 1 week and crushed through a 0.85mm sieve. The crushed wheat straw was placed in a crucible and compacted slightly. Then the crucible was placed in a muffle furnace, and the carbonization temperature was set to 350, 450, 550, 650 。 C, the heating rate is 12 。 C / min, carbonize for 3h, take it out after natural cooling to room temperature, wash with 1mol / L HCl, filter and wash with distilled water until neutral, at 75 。 C under the condition of drying to constant weight, wheat straw biochar can be obtained;

[0039] (2) Ash content: Take 1g of biochar passed through a 0.25mm sieve and spread it on the bottom of the crucible. 。 C for 4h, after cooling to room temperature, calculate the ash content of biochar by weight loss;

[0040] (3) BET method to calculate specific surface area, BJH method to calculate average pore dia...

experiment example 2

[0044] Effect of different concentrations of KOH modification on biochar adsorption.

[0045] (1) Preparation of wheat straw biochar: Wheat straw was air-dried for 2 weeks and crushed through a 0.85 mm sieve. The crushed wheat straw was placed in a crucible and lightly compacted. Then the crucible was placed in a muffle furnace and the temperature was adjusted to 450 °C. 。 C, the heating rate is 10 。 C / min, carbonize for 4h, take it out after natural cooling to room temperature, wash with 0.5mol / L HCl, filter and wash with distilled water until neutral, at 80 。 C under the condition of drying to constant weight, wheat straw biochar can be obtained;

[0046] (2) Preparation of KOH modified biochar: impregnate the original biochar prepared in the above step (2) in KOH solution, set the concentration of KOH solution to 0.1, 0.5, 1, 2, 3mol / L, and the solid-liquid ratio according to 1:20 (g / ml), 100 。 Heating and stirring at C for 2 hours, cooling naturally after heating, filte...

Embodiment 3

[0050] A preparation method of composite modified biochar, comprising the following steps:

[0051] (1) Preparation of wheat straw biochar: Wheat straw was air-dried for 3 weeks and crushed through a 0.85 mm sieve. The crushed wheat straw was placed in a crucible and lightly compacted. Then the crucible was placed in a muffle furnace and the temperature was adjusted to 450 °C. 。 C, the heating rate is 8 。 C / min, carbonize for 5h, take it out after natural cooling to room temperature, wash with 0.1mol / L HCl, filter and wash with distilled water until neutral, at 85 。 C under the condition of drying to constant weight, wheat straw biochar can be obtained;

[0052] (2) Preparation of KOH modified biochar: impregnate the original biochar prepared in the above step (1) in 2mol / L KOH solution, the solid-liquid ratio is 1:15 (g / ml), 105 。 Heating and stirring at C for 4 hours, cooling naturally after heating, filtering, washing with distilled water repeatedly until the pH remained ...

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Abstract

The invention discloses a composite modified biochar preparation method, which comprises: (a) preparation of wheat straw biochar: carrying out air-drying on wheat straw, crushing, sieving, carbonizing, cooling to a room temperature, washing with an acid, filtering, washing to achieve a neutral state, and drying to achieve constant weight; (b) preparation of alkali-modified biochar: soaking the wheat straw biochar in an alkaline solution, carrying out heating stirring, naturally cooling, filtering, washing with distilled water, and drying; and (c) preparation of magnetic / alkali composite modified biochar: dipping the alkali modified biochar in an iron ion solution, adjusting the pH value, carrying out mixing standing, carrying out ultrasonic wave treatment, carrying out heating stirring, drying, and washing to obtain the magnetic / alkali composite modified biochar. According to the present invention, the advantages of the two modification technologies are combined by adopting the composite modification method, such that the adsorption efficiency on cadmium in wastewater is improved.

Description

technical field [0001] The invention belongs to the technical field of environmental material preparation, and in particular relates to a modified-FeCl 3 Solution impregnation modification-ultrasonic modification method to prepare magnetic / alkali composite modified biochar. Background technique [0002] Cadmium-containing wastewater is one of the most harmful heavy metal wastewater. Cadmium is extremely toxic and cannot be removed through water self-purification, which seriously threatens human health and safety. Cadmium-containing wastewater mainly comes from tailings drainage, cadmium-containing metal mining drainage, cadmium compound industrial drainage, and electrolytic plating enterprises. In the natural environment, cadmium can be transferred, enriched and amplified through the food chain, and finally transferred to various organs of the human body through the skin, respiratory tract or digestive tract, leading to cardiovascular and cerebrovascular diseases, renal fai...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/28B01J20/30C02F1/28C02F101/20
CPCB01J20/041B01J20/06B01J20/20B01J20/28054C02F1/288C02F2101/20
Inventor 何俊瑜崔志文任艳芳张黎明王伟张陆云
Owner CHANGZHOU UNIV
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