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

A composite material and carbon-based technology, applied in the field of carbon-based composite materials and their preparation, can solve problems such as low adsorption capacity, and achieve the effect of increasing biomass and efficient fixation

Active Publication Date: 2021-11-19
INST OF ENVIRONMENT & SUSTAINABLE DEV IN AGRI CHINESE ACADEMY OF AGRI SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

CN 108816188A discloses a goethite modified biochar and its preparation method and application. The modified biochar provided by this patent has a certain adsorption effect on arsenic, but its adsorption capacity is still low

Method used

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

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Embodiment 1

[0060] This embodiment provides a method for preparing a carbon-based composite material, the preparation method comprising the following steps: uniformly mixing modified biochar, ironmaking water washing slag and red mud at a mass ratio of 4:1:1, pulverizing, The carbon-based composite material is obtained after sieving.

[0061] The iron-making washed slag includes calcium namate and calcium silicate; the total mass fraction of calcium carbonate and calcium silicate in the iron-making washed slag is 100wt%, the mass fraction of calcium carbonate is 94wt%, and the balance is silicic acid calcium.

[0062] The chemical composition of the red mud includes: 64.97wt% of kazolite, 32.29wt% of cancryptite and 2.74wt% of hydrated calcium aluminate in terms of mass percentage.

[0063] Described modified biochar adopts following preparation method to obtain, and described preparation method comprises the following steps:

[0064] (1) Carbonize the biomass raw material at 600°C for ...

Embodiment 2

[0068] This embodiment provides a method for preparing a carbon-based composite material. The preparation method includes the following steps: uniformly mixing modified biochar, iron-making water-washed slag and red mud at a mass ratio of 4:0.5:0.25, pulverizing, The carbon-based composite material is obtained after sieving.

[0069] The iron-making washed slag includes calcium namate and calcium silicate; the total mass fraction of calcium carbonate and calcium silicate in the iron-making washed slag is 100wt%, the mass fraction of calcium carbonate is 92wt%, and the balance is silicic acid calcium.

[0070] The chemical composition of the red mud includes, in terms of mass percentages: 63 wt% of jazzolite, 33.8 wt% of cancryptite, and 3.2 wt% of calcium aluminate hydrate.

[0071] Described modified biochar adopts following preparation method to obtain, and described preparation method comprises the following steps:

[0072] (1) Carbonize the biomass raw material at 650°C ...

Embodiment 3

[0076]This embodiment provides a method for preparing a carbon-based composite material, the preparation method comprising the following steps: uniformly mixing modified biochar, ironmaking water washing slag and red mud at a mass ratio of 4:4:1, pulverizing, The carbon-based composite material is obtained after sieving.

[0077] The iron-making washed slag includes calcium namate and calcium silicate; the total mass fraction of calcium carbonate and calcium silicate in the iron-making washed slag is 100wt%, the mass fraction of calcium carbonate is 96wt%, and the balance is silicic acid calcium.

[0078] The chemical composition of the red mud includes, in terms of mass percentages: 65% by weight of jazzolite, 32.5% by weight of cancryptite, and 2.5% by weight of hydrated calcium aluminate.

[0079] Described modified biochar adopts following preparation method to obtain, and described preparation method comprises the following steps:

[0080] (1) Carbonize the biomass raw ...

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Abstract

The invention provides a carbon-based composite material as well as a preparation method and application thereof. The carbon-based composite material is obtained by mixing modified biomass charcoal, ironmaking washing slag and red mud according to a certain proportion; according to the carbon-based composite material, the modified biomass charcoal, the ironmaking washing slag and the red mud are used for repairing heavy metal polluted soil, and the three materials have a synergistic effect, so that low-cost and high-efficiency repairing of the arsenic and cadmium combined polluted soil is realized; pollution elements with different chemical forms of arsenic and cadmium and different soil environment behaviors are efficiently fixed at the same time; in addition, the carbon-based composite material provided by the invention can effectively reduce the content of arsenic and cadmium in soil, reduce the absorption of plants to arsenic and cadmium, and improve the biomass of crops.

Description

technical field [0001] The invention belongs to the technical field of soil heavy metal restoration, and relates to a carbon-based composite material and a preparation method and application thereof. Background technique [0002] Arsenic and cadmium are toxic and harmful trace elements. Excessive arsenic and cadmium will accumulate continuously after entering the farmland soil. Not only will its content exceed the background value of the soil environment, but it will also harm crops for a long time, and at the same time reduce the number of soil flora and microorganisms , thus affecting microbial diversity, soil quality, planting safety, food safety, residents' health and ecological security are all seriously threatened. Epidemiological data show that cadmium pollution mainly has adverse effects on the health of residents in polluted areas, especially the reproductive health of women and the growth and development of children. Arsenic and its compounds have been recognized ...

Claims

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Application Information

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IPC IPC(8): C09K17/08B09C1/08A01B79/02C09K101/00
CPCC09K17/08B09C1/08A01B79/02C09K2101/00
Inventor 李莲芳戴思睿
Owner INST OF ENVIRONMENT & SUSTAINABLE DEV IN AGRI CHINESE ACADEMY OF AGRI SCI
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