Biochar-based composite material as well as preparation method and application thereof

A composite material and biochar technology, applied in chemical instruments and methods, water pollutants, other chemical processes, etc., can solve problems such as complex operation, unsuitable, large residue, etc., and achieve wide range of raw materials, wide application range, and purification The effect of excellent performance

Active Publication Date: 2020-09-22
GUANGZHOU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

CN104445732A discloses a process for neutralizing and coagulating heavy metal wastewater containing thallium to remove thallium. The process is carried out in two stages. In the first stage, heavy metal wastewater containing thallium is adjusted to alkalinity by acid and alkali, and high-efficiency coagulants, sulfides, flocculation agent, and then carry out solid-liquid separation through the inclined plate settling tank, the secondary treatment adds sulfide, diatomaceous earth, flocculant to the supernatant purified water after the primary treatment, and separates the solid and liquid through the inclined plate settling tank, the present invention Although the process scheme is effective, it needs to use a large amount of flocculant, diatomaceous earth an

Method used

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  • Biochar-based composite material as well as preparation method and application thereof
  • Biochar-based composite material as well as preparation method and application thereof
  • Biochar-based composite material as well as preparation method and application thereof

Examples

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Effect test

Embodiment 1

[0050] This example provides a biochar-based composite material, including: biochar containing potassium; and zero-valent manganese supported on the biochar containing potassium.

[0051] Wherein, the mass fraction of potassium in the potassium-containing biochar is 1-15 wt%. The mass fraction of zero-valent manganese is 0.5-25wt%.

Embodiment 2

[0053] This example provides a preparation method of a biochar-based composite material, comprising the following steps:

[0054] S1: Pyrolyzing the potassium-containing biomass raw material in an inert gas to obtain potassium-containing biochar;

[0055] S2: immerse the potassium-containing biochar obtained in step S1 in a sodium borohydride solution to react;

[0056] S3: adding the manganese salt solution into the mixed solution after the reaction in step S2, standing still after the reaction, separating the obtained precipitate, washing and drying the precipitate to obtain the biochar-based composite material.

[0057] Wherein, the potassium-containing biomass raw material includes at least one of watermelon peel, banana peel and cauliflower stalk. The mass fraction of potassium in watermelon peel, banana peel and cauliflower stalk usually meets 4-15%.

[0058] In step S1, the pyrolysis temperature is 450-600°C. The pyrolysis time is 1~5h. The pyrolysis is carried out ...

Embodiment 3

[0062] This example provides the application of biochar-based composite materials in the treatment of thallium-containing wastewater.

[0063] When the biochar-based composite material is used to treat thallium-containing wastewater, the dosage is preferably 0.2-3.0 g of the material per liter of thallium-containing wastewater.

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Abstract

The invention provides a biochar-based composite material as well as a preparation method and application thereof. The material comprises a potassium-containing biochar substrate and zero-valent manganese loaded on the potassium-containing biochar substrate. The biochar-based composite material disclosed by the embodiment of the invention is wide in raw material source and low in cost. A large amount of waste biomass is generated every year in the agricultural field, such as peel, vegetable residues and tree branches and leaves; watermelon peel, banana peel, cauliflower pedicels and the like in the huge-amount waste are high in potassium content, and can be used as preparation raw materials of the biochar-based composite material, so that resource utilization of solid waste is achieved.

Description

technical field [0001] The invention belongs to the technical field of thallium-containing wastewater treatment, and in particular relates to a biochar-based composite material and its preparation method and application. Background technique [0002] Thallium (Tl) is located in the third main group (IIIA) of the periodic table, and its atomic weight and atomic number are 204.38 and 81, respectively. Tl in nature mainly exists in two oxidation states, Tl(I) and Tl(III). The dual geochemical properties of lithophilic and sulfophilic properties of Tl(I) make it widely distributed in metal sulfide minerals. [0003] The abundance of thallium in the earth's crust is 0.75 mg / kg, but in the secondary environment, thallium is easy to migrate, and thallium-containing ores or minerals can release a large amount of thallium to the environment under secondary oxidation and activate migration. Thallium is a highly toxic heavy metal element. Its toxicity is greater than typical heavy me...

Claims

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Application Information

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IPC IPC(8): B01J20/20B01J20/30C02F1/28C02F1/70C02F101/20
CPCB01J20/20B01J20/04C02F1/283C02F1/281C02F1/705C02F2101/20
Inventor 李伙生李珂珂龙建友张高生肖唐付张鸿郭张平余明霞李玉婷刘凤丽邓胜文林连花
Owner GUANGZHOU UNIVERSITY
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