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Preparation method for magnetic lignin-based activated carbon

A technology based on lignin and activated carbon, applied in chemical instruments and methods, alkali metal oxides/hydroxides, inorganic chemistry, etc., can solve the problems of low corrosion and weak alkalinity of equipment, and achieve less pollutant discharge, Well-developed pores and high adsorption performance

Inactive Publication Date: 2014-02-19
SOUTHWEST JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] K 2 CO 3 and KHCO 3 The alkalinity is weak, less corrosive to equipment, and can avoid ZnCl 2 The potential environmental pollution caused is a relatively good activator in the process of preparing activated carbon by chemical activation [DAdinata, WMAWDaud, M K Aroua. Preparation and characterization of activated carbon from palm shell. by chemical activation with K 2 CO 3 , Bioresource Technology, 2007, 98: 145-149.I I Gurten, M Ozmak, E Yagmur, et al. Preparation and characterization of activated carbon from waste tea using K 2 CO 3 .Biomass and Bioenergy, 2012, 37:73-81.], but it has not been reported in the study of one-step preparation of magnetic activated carbon

Method used

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  • Preparation method for magnetic lignin-based activated carbon
  • Preparation method for magnetic lignin-based activated carbon
  • Preparation method for magnetic lignin-based activated carbon

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Embodiment

[0023] In order to better understand the present invention, the present invention will be further described in detail below in conjunction with the examples, but the scope of protection claimed by the present invention is not limited to the scope represented by the examples.

[0024] Embodiment 1~14 prepares the general technological process of magnetic activated carbon with lignin as follows:

[0025] Weigh lignin, activator and magnetic additive according to lignin:activator:magnetic additive=4:2-8:0.2-0.6 (mass ratio). The aqueous solution of lignin, magnetic additive and activator is adjusted into a paste, mixed evenly, and dried. Then, put it into a carbonization furnace and raise the temperature to 650-850°C for carbonization activation. The activation time is 0.5-3 hours, and then it is quenched and cooled. Wash with dilute acid and distilled water in sequence until the pH value is 6-8, dry and grind to obtain magnetic lignin-based activated carbon.

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Abstract

The invention discloses a preparation method for magnetic lignin-based activated carbon. The method comprises the following specific steps: stirring lignin, a chemical activating agent and a magnetic additive with water into paste, and uniformly mixing; after drying, performing carbonization and activation at the temperature of 650-850 DEG C, and then quenching and cooling, wherein the activation time is 0.5-3 hours; washing by sequentially using diluted acid and water until the pH value is 6-8, drying, and finely grinding, so that the magnetic lignin-based activated carbon is obtained. According to the invention, the combination of a oriented preparation technology and a magnetic functionalization technology for the activated carbon can be realized through a simple and convenient one-step preparation process, the used activating agent is environment-friendly, and the obtained magnetic activated carbon is large in specific area and excellent in adsorptive property, and has sufficient magnetic intensity and magnetic stability.

Description

technical field [0001] The invention relates to a method for preparing magnetic activated carbon, in particular to a method for preparing magnetic activated carbon from lignin. Background technique [0002] Activated carbon is a carbonaceous adsorption material with rich pore structure and large specific surface area. It has excellent adsorption performance and stable chemical properties. It has been widely used in industry, national defense, transportation, medicine and health, environmental protection and other fields. However, it is difficult to separate and recover activated carbon in application, and the traditional filtration method is likely to cause screen blockage or loss of activated carbon. In contrast, magnetic separation technology has the advantages of convenience, speed, high quality, and low price. Therefore, the development of magnetic activated carbon has become one of the research hotspots in the field of activated carbon today. [0003] Looking at the re...

Claims

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Application Information

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IPC IPC(8): B01J20/20B01J20/28B01J20/30
Inventor 张胜利姜曼周祚万崔国栋王东梅
Owner SOUTHWEST JIAOTONG UNIV
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