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Preparation method of organic modification biochar for treating heavy metal cadmium in wastewater

A technology for treating wastewater and biochar, which is applied in the directions of alkali metal compounds, alkali metal oxides/hydroxides, water pollutants, etc., and can solve problems such as threats to human health and safety, strong toxicity of cadmium, and inability to be removed by self-purification, etc. To achieve the effect of improving adsorption efficiency, increasing adsorption sites, and increasing specific surface area

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

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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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  • Preparation method of organic modification biochar for treating heavy metal cadmium in wastewater
  • Preparation method of organic modification biochar for treating heavy metal cadmium in wastewater
  • Preparation method of organic modification biochar for treating heavy metal cadmium in wastewater

Examples

Experimental program
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Effect test

Embodiment 1

[0029] (1) Preparation of wheat straw biochar: Wheat straw was air-dried for 1 week 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. ℃, the heating rate is 8℃ / min, carbonize for 5h, take it out after natural cooling to room temperature, wash with 1mol / L HCl, filter and wash with distilled water until neutral, and dry at 75℃ to constant weight, that is Wheat straw biochar can be obtained;

[0030] (2) Preparation of organically modified biochar: A certain amount of chitosan was dissolved in 2% acetic acid, and the solid-to-liquid ratio of chitosan and acetic acid was 1:50, and the wheat straw prepared in step (a) was Biochar is impregnated in chitosan solution, the mass ratio of biochar to chitosan is 3:1, 2:1, 1:1, 1:2, 1:3, after mixing and stirring for 1h, ultrasonic treatment is performed at 40kHz 0.25h, then drop the chit...

Embodiment 2

[0034] (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 500 °C. ℃, the heating rate is 10℃ / 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, dry at 80℃ to constant weight, Wheat straw biochar can be obtained;

[0035] (2) Preparation of organically modified biochar: A certain amount of chitosan was dissolved in 2% acetic acid, and the solid-to-liquid ratio of chitosan and acetic acid was 1:70, and the wheat straw prepared in step (a) was Biochar is impregnated in chitosan solution, set the mass ratio of biochar to chitosan as 1:1, mix and stir for 1.5h, then use 50kHz ultrasonic treatment for 0.5h, then inject chitosan-biochar suspension Add it dropwise t...

Embodiment 3

[0040] (1) Preparation of wheat straw biochar: Wheat straw was air-dried for 4 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 550 °C. ℃, the heating rate is 12℃ / min, carbonize for 3h, take it out after natural cooling to room temperature, wash with 0.1mol / L HCl, filter and wash with distilled water until neutral, dry at 85℃ to constant weight, Wheat straw biochar can be obtained;

[0041] (2) Preparation of organically modified biochar: A certain amount of chitosan was dissolved in 2% acetic acid, and the solid-liquid ratio of chitosan and acetic acid was 1:90, and the wheat straw prepared in step (a) was Biochar is impregnated in chitosan solution, set the mass ratio of biochar to chitosan as 1:1, mix and stir for 2 hours, then use 60kHz ultrasonic treatment for 1 hour, then add the chitosan-biochar suspension dropwise with a...

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Abstract

The invention discloses a preparation method of organic modification biochar for treating heavy metal cadmium in wastewater. The preparation method comprises: (a) preparation of wheat straw biochar: carrying out air-drying on wheat straw, crushing, sieving, carbonizing the crushed wheat straw, naturally cooling to a room temperature after the carbonization, washing with an acid, filtering, washingwith distilled water to achieve a neutral state, and drying to achieve a constant weight to obtain wheat straw biochar; and (b) preparation of organic modification biochar: soaking the wheat straw biochar prepared in the step (a) in a chitosan solution, performing ultrasonic wave treatment after mixing and stirring, adding the chitosan-biochar suspension into an alkaline solution in a dropwise manner by using an injector, standing, filtering, washing with distilled water to achieve a neutral state, and drying to achieve constant weight so as to obtain the organic modification biochar. According to the present invention, by using organic modification, the advantages of two adsorbents of chitosan and biochar are combined, such that the adsorption efficiency of the biochar on cadmium in wastewater is greatly improved.

Description

technical field [0001] The invention belongs to the technical field of environmental material preparation, and in particular relates to a method for preparing organically modified biochar for treating heavy metal cadmium in wastewater by using an organic / physical modification method. 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, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/24B01J20/28B01J20/30C02F1/28C02F101/20
CPCB01J20/20B01J20/24B01J20/28054C02F1/288C02F2101/20
Inventor 任艳芳崔志文何俊瑜张黎明王伟薛宇豪
Owner CHANGZHOU UNIV
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