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Method for preparing activated carbon by using microalgae-alginate composite

A technology for preparing activated carbon and alginate, applied in carbon compounds, chemical instruments and methods, inorganic chemistry, etc., can solve the problem of reducing the specific surface area of ​​activated carbon, and achieve the effect of abundant utilization, large specific surface area and rich micropores

Active Publication Date: 2018-12-07
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Application Information

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Problems solved by technology

CN104138743 A discloses a preparation method of an algae-based magnetic activated carbon material, comprising the following steps: a. soaking cyanobacteria in an iron precursor solution for 12 to 24 hours; b. separating the soaked cyanobacteria and drying them; c. After the dried cyanobacteria is carbonized at high temperature and cooled, it is an algae-based magnetic activated carbon material. However, in this method, the iron precursor does not produce pores after high-temperature treatment. specific surface area

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  • Method for preparing activated carbon by using microalgae-alginate composite

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Embodiment 1

[0036] Embodiment 1: Preparation of activated carbon with flat algae-sodium alginate complex as raw material

[0037] First, in a beaker, evenly disperse 25g of algae powder in deionized water, add sodium alginate and mix evenly, wherein the mass ratio of algae and sodium alginate is 1:2, and dry naturally to obtain alginate-alginic acid sodium complex. Then, in a tube furnace, under a nitrogen atmosphere (N 2 The flow rate is 120ml / min), at a heating rate of 2.5 °C / min, the resulting composite is heated to 500 °C for carbonization reaction for 1 h; Cool down to room temperature, take out the reaction product, and wash it three times with 1M HCl solution, then wash it with deionized water until neutral; finally dry it in an oven at 110°C for 12 hours to obtain the finished activated carbon. figure 1 It is the SEM figure of the activated carbon obtained according to the embodiment of the present invention 1, and the obtained activated carbon has a special structure and has ab...

Embodiment 2

[0038] Example 2: Preparation of activated carbon with Scenedesmus-sodium alginate compound as raw material

[0039] First, in a beaker, disperse 25g Scenedesmus powder in deionized water evenly, add sodium alginate and mix uniformly to obtain alginic acid-alginate complex, then add potassium hydroxide and mix uniformly to obtain a mixture, and then dry naturally, of which The mass ratio of algae, sodium alginate and potassium hydroxide is 1:1:1. Under nitrogen atmosphere (N 2 The flow rate is 120ml / min), and the resulting mixture is heated to 500°C at a heating rate of 2.5°C / min for carbonization reaction for 1h; then the temperature is raised to 700°C at a heating rate of 5°C / min for 2h activation. After cooling down to room temperature under a nitrogen atmosphere, the reaction product was taken out, washed three times with 1M HCl solution, and then washed with deionized water until neutral; finally, it was dried in an oven at 110°C for 12 hours to obtain the finished activ...

Embodiment 3

[0040] Embodiment 3: Preparation of activated carbon with golden algae-potassium alginate complex as raw material

[0041] First, in a beaker, disperse 25g of golden algae evenly in deionized water, add potassium alginate and mix evenly, wherein the mass ratio of golden algae to potassium alginate is 1:1, and dry naturally to obtain golden algae-alginic acid potassium complex. Then, in a tube furnace, under a nitrogen atmosphere (N 2 The flow rate is 120ml / min), and at a heating rate of 2.5 °C / min, the resulting composite is heated to 500 °C to perform carbonization reaction on the complex for 1 h; then the temperature is raised to 700 °C at a heating rate of 5 °C / min for 1 h activation , the temperature was lowered to room temperature in a nitrogen atmosphere, the reaction product was taken out, and it was washed three times with a 1M HCl solution, and then washed with deionized water until neutral; finally, it was dried in an oven at 110°C for 12 hours to obtain a finished ...

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Abstract

The invention provides a method for preparing activated carbon by using a composite raw material which is obtained by compounding microalgae-alginate. The method comprises the step of performing a reaction on on the microalgae-alginate composite through a physical activation process, a chemical activation process or a physical chemical combined activation process so as to obtain the activated carbon. According to the method, the microalgae-alginate composite is utilized as a raw material for preparing the activated carbon, and the obtained activated carbon product has the advantages of a largespecific surface area, abundant micropores, narrow pore size distribution and the like.

Description

technical field [0001] The invention belongs to the field of activated carbon preparation, and more specifically relates to a method for preparing activated carbon by using microalgae-alginate compound as a raw material. Background technique [0002] Activated carbon has the characteristics of huge specific surface area, particularly developed micropores, good electrical and thermal conductivity, and good chemical stability. It has been widely used in catalysis, adsorption, medicine, new energy and other fields. At present, the raw materials for preparing activated carbon mainly include woody materials such as wood and coconut shells, coal materials such as lignite, bituminous coal, anthracite, etc., and petroleum products such as petroleum coke. In recent years, the use of other materials, such as biomass, to prepare activated carbon has also attracted much attention. Microalgae is a single-celled algae with a simple structure. Its size is usually from a few microns to hun...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/336C01B32/342C01B32/348C01B32/318
CPCC01P2004/03
Inventor 吴雅琪陈兆安刘亚男徐云鹏刘中民
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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