Method for preparing nano-metal oxide loaded activated carbon and application of nano-metal oxide loaded activated carbon

Abstract

The invention discloses a method for preparing nano-metal oxide loaded activated carbon and application of the nano-metal oxide loaded activated carbon. Furfural residues are used as a carbon source and subjected to pre-carbonization, activation, nano-metal oxide impregnation and adsorption and re-carbonization treatment. The method specifically comprises the following steps: S1, carbonization: carbonizing furfural residues for 4-6 hours at 250-300 DEG C in a nitrogen atmosphere; S2, activating: activating the obtained black carbon residue, potassium hydroxide and potassium bicarbonate mixture at 400-500 DEG C for 1-3 hours, pickling until the pH value is neutral, and drying at 60 DEG C; and S3, loading: dispersing the composite nano metal oxide into microcrystalline cellulose sol to obtain mixed coated sol, adding the obtained activated carbon, performing pressure impregnation adsorption for 1-3 hours, dehydrating, and carbonizing again for 1-2 hours at 150-200 DEG C in a nitrogen atmosphere. According to the preparation method, loading of the nano metal oxide in an activated carbon structure is completed by means of sol coating and dipping adsorption, the loading capacity is high, the energy consumption is low, all loading of the nano metal oxide can be achieved, the composite structure is further reinforced in the carbonization process, and the stability is improved.

Description

[0001] This invention is a divisional application, the original Chinese patent application number is: 201811076050.2, the application date is: September 14, 2018, and the patent name at the time of application is: a method for preparing loaded activated carbon with furfural slag as raw material and its application. technical field [0002] The invention relates to the field of resource development and utilization of waste bio-based materials, and also relates to the technical field of functional activated carbon, in particular to a method for preparing activated carbon loaded with nanometer metal oxides and its application. Background technique [0003] The surface of nanomaterials is covered with a stepped structure, and the surface area is relatively increased, showing specific surface effects, volume effects, quantum size effects, and macroscopic quantum tunneling effects. They are widely used in electronics, optics, chemical industry, ceramics, biology and medicine. and o...

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Problems solved by technology

At present, the direct impregnation method of metal salt solution is mainly used to prepare activated carbon supported by nanometer metal oxides. First, the activated carbon is impregnated in the metal salt solution, and then the adsorbed metal salt is decomposed at high temperature. First, the loading capacity is low, and the activated carbon cannot absorb all metal cations. There are still residues in the salt solution. The second is that the pyrolysis temperature is too high. The decomposition temperature of some metal salts can be as high as 1000 °C or more. For example, the decomposition temperature of strontium sulfate is 1374 °C, and the energy consumption is relatively high.

For example, the patent application number CN201410048253.6 discloses a method of porous carbon loading nano-metal oxides or nano-metal materials. The hydrothermal method realizes the loading process of metal salts and the carbonization process of sugars, but the subsequent heat treatment temperature is up to 1100 ℃, high energy consumption; for example, the patent of CN201711374031.3 discloses a preparation method of nanometer metal oxide and porous activated carbon composite material, which also has the problem of high energy consumption and low loading capacity

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