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Preparation method of microalga-based biochar material for heavy metal ion adsorption

A technology of heavy metal ions and biochar, applied in chemical instruments and methods, other chemical processes, etc., can solve problems such as poor adsorption effect of heavy metal ions, and achieve the effects of high photosynthesis efficiency, controllable morphology, and short growth cycle.

Inactive Publication Date: 2016-07-27
SHANGHAI ADVANCED RES INST CHINESE ACADEMY OF SCI
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Problems solved by technology

[0004] In view of the above-mentioned shortcoming of the prior art, the object of the present invention is to provide a kind of preparation method of the microalgae-based biochar material that is used for the adsorption of heavy metal ions, for solving the problem of the porous carbon prepared by the preparation method in the prior art on groundwater. The problem of poor adsorption effect of medium and heavy metal ions

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  • Preparation method of microalga-based biochar material for heavy metal ion adsorption

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[0036] The invention provides a method for preparing a microalgae-based biochar material for heavy metal ion adsorption, such as figure 1 As shown, the preparation method at least includes the following steps:

[0037] S1: add microalgae and water into the hydrothermal reactor to prepare microalgae suspension;

[0038] S2: adding an organic acid to the microalgae suspension, sealing the hydrothermal reaction kettle, and introducing a protective gas to replace the air in the hydrothermal reaction kettle;

[0039]S3: placing the hydrothermal reaction kettle in the step 2) in an oven for carbonization reaction to obtain a microalgae-based biochar material;

[0040] S4: Activating the microalgae-based biochar material to obtain an activated microalgae-based biochar material.

Embodiment 1

[0043] Accurately weigh 1.0g of freeze-dried green algae, 50ml of deionized water, add it to a 100ml hydrothermal reaction kettle, 1g of oxalic acid, ultrasonic for 10min, seal the reaction kettle and pass it into N 2 The air in the kettle was replaced, and finally placed in an oven at 180°C for carbonization for 4 hours, cooled, filtered, washed, dried, and then vacuum-dried at 80°C for 12 hours to obtain a microalgae-based biochar material. 1g of the microalgae-based biochar material and 0.01g·ml -1 The KOH solution was mixed and placed in a tubular reactor for activation at 400°C for 1 hour to obtain activated microalgae-based biochar materials.

Embodiment 2

[0045] Accurately weigh 2.0g of Scenedesmus after freeze-drying treatment, add 50ml of deionized water into a 100ml hydrothermal reaction kettle, and add 1g of acrylic acid, ultrasonic for 10min, seal the reaction kettle and pass it into N 2 Replace the air in the kettle, and finally place it in an oven at 180°C for 8 hours of carbonization, cool, filter, wash, dry, and then vacuum-dry at 80°C for 12 hours to obtain a microalgae-based biochar material. 1g of the microalgae-based biochar material and 0.1g·ml -1 The KOH solution was mixed and placed in a tubular reactor for activation at 600°C for 2 hours to obtain activated microalgae-based biochar materials.

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Abstract

The invention provides a preparation method of a microalga-based biochar material for heavy metal ion adsorption. The preparation method comprises the following steps that 1, microalgae and water are added into a hydrothermal reaction kettle to prepare microalga suspension liquid; 2, organic acid is added into the microalga suspension liquid, and after the hydrothermal reaction kettle is sealed, protective gas is introduced into the hydrothermal reaction kettle to replace air in the hydrothermal reaction kettle; 3, the hydrothermal reaction kettle in the step 2 is placed in a drying oven for a carbonation reaction, and the microalga-based biochar material is obtained; 4, activating treatment is performed on the microalga-based biochar material, and the activated microalga-based biochar material is obtained. According to the preparation method, biochar is prepared through hydrothermal carbonization by taking the nitrogen-containing microalgae as the raw material, and then activated modification is performed on the biochar through a KOH activating method and a NH3 activating method separately by taking the biochar as a precursor; the activated microalga-based biochar material obtained through activated modification has micro-mesoporous structures, the large specific surface area and the large pore volume, and the adsorption capacity of porous charcoal is greatly improved.

Description

technical field [0001] The invention belongs to the fields of environmental protection and renewable resource utilization, and relates to a preparation method of a microalgae-based biochar material used for heavy metal ion adsorption. Background technique [0002] With the increasing industrial pollution, people have found a variety of heavy metal toxic ions in groundwater, such as Cu(II), Cr(VI), Cd(II), Co(II) and Pb(II), etc., which exist in drinking Toxic heavy metal ions in water seriously damage human physiological health. Among these heavy metal ions, Cr(VI) is a highly toxic species. According to the definition of the World Toxicology Organization (NTP), Cr is a human carcinogen. Hexavalent Cr(VI) in environmental water is mainly H 2 CrO 4 、HCrO 4 - 、Cr 2 o 7 - , CrO 4 2- and other forms exist, and it is difficult to pass the CO 3 - and OH - Sedimentation treatment. Therefore, people try to remove Cr(VI) in wastewater by various methods, such as co-prec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/02B01J20/20
CPCB01J20/20
Inventor 孙予罕谭智超孔令照鲍利伟苗改罗虎汪靓唐志永
Owner SHANGHAI ADVANCED RES INST CHINESE ACADEMY OF SCI
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