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Cellulose modified activated carbon heavy metal adsorption material, and preparation method and application thereof

A technology for adsorbing materials and cellulose, which is applied in the field of biomass resource reuse and new materials with environmental functions, and achieves the effects of high adsorption rate, high capacity, reuse, and large pore volume.

Inactive Publication Date: 2017-09-15
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] Judging from the existing research, it is still necessary to make full use of the cellulose in agricultural wastes to prepare efficient, universal and chemical functional group-modified activated carbon adsorption materials through simple methods.

Method used

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  • Cellulose modified activated carbon heavy metal adsorption material, and preparation method and application thereof
  • Cellulose modified activated carbon heavy metal adsorption material, and preparation method and application thereof
  • Cellulose modified activated carbon heavy metal adsorption material, and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0058] Example 1: Preparation of a cellulose-modified activated carbon adsorption material

[0059] The cellulose was placed in a tube furnace, and the temperature was raised to 300 °C at a rate of 5 °C / min. 2 The cellulose charcoal (CAC) was obtained by carbonizing under airflow for 60 minutes; the above cellulose charcoal and potassium hydroxide were mixed according to the mass ratio of 1:3, and deionized water was added thereto to keep the lye concentration of 30wt%. The above solution was dried in an oven at 80° C. to obtain cellulose activated carbon-potassium hydroxide (CAC-KOH); the above-mentioned cellulose activated carbon-alkali was placed in a tube furnace and heated at a rate of 5° C. / min to 700°C, under continuous N 2 Insulated under airflow for 60min to obtain cellulose activated carbon (CAC-700); mix the above-mentioned cellulose activated carbon with 30% concentrated nitric acid according to the mass ratio of 1:7.5, stir and react at 70°C oil bath temperature ...

Embodiment 2

[0061] Embodiment 2: Preparation of a kind of cellulose modified activated carbon adsorption material

[0062] The cellulose was placed in a tube furnace, and the temperature was raised to 250 °C at a heating rate of 3 °C / min. 2 The cellulose charcoal (CAC) was obtained by carbonizing under airflow for 80 minutes; the above-mentioned cellulose charcoal and potassium hydroxide were mixed according to the mass ratio of 1:2, and then deionized water was added to it to keep the lye concentration of 20wt%. The above solution was dried in an oven at 70°C to obtain cellulose activated carbon-potassium hydroxide (CAC-KOH); the above-mentioned cellulose activated carbon-alkali was placed in a tube furnace, and the temperature was raised to 550°C, under continuous N 2 Insulated under air flow for 240min to obtain cellulose activated carbon (CAC-550); mix the above-mentioned cellulose activated carbon with 20% concentrated nitric acid in a mass ratio of 1:10, stir and react for 2h at an...

Embodiment 3

[0063] Example 3: Preparation of a cellulose-modified activated carbon adsorption material

[0064] The cellulose was placed in a tube furnace, and the temperature was raised to 350 °C at a rate of 8 °C / min. 2 The cellulose charcoal (CAC) was obtained by carbonizing under airflow for 40 minutes; the above-mentioned cellulose charcoal and potassium hydroxide were mixed according to the mass ratio of 1:4, and then deionized water was added to it to maintain the lye concentration of 40wt%. The above solution was dried in an oven at 90°C to obtain cellulose activated carbon-potassium hydroxide (CAC-KOH); the above-mentioned cellulose activated carbon-alkali was placed in a tube furnace and heated at a rate of 8°C / min to 850°C, under continuous N 2 Insulated under air flow for 30min to obtain cellulose activated carbon (CAC-850); mix the above-mentioned cellulose activated carbon with 40% concentrated nitric acid in a mass ratio of 1:5, stir and react at 60°C for 4h in an oil bath...

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Abstract

The invention belongs to the technical field of biomass resource reuse and new environmental functional materials, and especially relates to a cellulose modified activated carbon heavy metal adsorption material (CAC-NA), a preparation method thereof, and an application thereof in the fields of environmental treatment and restoration, especially the restoration of heavy metal pollution, such as the heavy metal adsorption field. The preparation method comprises the following steps: (1) heating cellulose in nitrogen atmosphere to carbonize the cellulose in order obtain cellulose charcoal; (2) mixing the cellulose carbon with a strong alkali and water, drying the obtained mixture to obtain cellulose activated carbon-alkali, and heating the cellulose activated carbon-alkali to obtain cellulose activated carbon; and (3) mixing the cellulose activated carbon with concentrated nitric acid, carrying out a heating and stirring reaction, and filtering, washing and drying the obtained reaction product to obtain the cellulose modified activated carbon heavy metal adsorption material. The cellulose modified activated carbon heavy metal adsorption material has the characteristics of high adsorption rate, high adsorption capacity and high removal rate, the heavy metal cadmium adsorption capacity of the material reaches 368 mg / g, and the material is a heavy metal adsorbent having excellent performances.

Description

technical field [0001] The invention belongs to the technical field of biomass resource reuse and new environmental functional materials, and in particular relates to a cellulose-modified activated carbon heavy metal adsorption material (CAC-NA) and its preparation method and its application in the field of environmental governance and restoration, especially the restoration of heavy metals Pollution, such as heavy metal adsorption areas. Background technique [0002] With the rapid development of mining industry, chemical fertilizer, pesticide, battery, metallurgy and electrical appliance manufacturing industries, wastes containing heavy metals are directly or indirectly discharged into the environment, causing serious environmental pollution. Heavy metal pollution has aroused widespread concern in the society due to its strong toxicity, long duration and biodegradability. Heavy metals discharged into the environment can enter the human body through the food chain and enda...

Claims

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Application Information

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IPC IPC(8): B01J20/24B01J20/30C02F1/28B01D15/08C02F101/20C02F101/22
CPCB01J20/24B01D15/08B01J20/20C02F1/281C02F1/286C02F2101/20C02F2101/22
Inventor 章莉娟陈全郑杰伟温李阳杨琛
Owner SOUTH CHINA UNIV OF TECH
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