Method for preparing load type activated carbon from furfural residues and application of load type activated carbon

Abstract

The invention discloses a method for preparing load type activated carbon from furfural residues and application of the load type activated carbon. The furfural residues are used as carbon sources, and pre-carbonization, activation, nanometer metal oxide impregnation and adsorption and recarbonization treatment are carried out on the furfural residues. The method particularly includes steps of S1,carbonizing the furfural residues at the temperatures of 250-300 DEG C in nitrogen atmosphere for 4-6 h; S2, carrying out activation, to be more specific, activating obtained black carbon residue, potassium hydroxide and potassium bicarbonate mixtures at the temperatures of 400-500 DEG C for 1-3 h, carrying out acid pickling on activation products until the PH (potential of hydrogen) of the activation products shows the activation products are neutral and carrying out drying at the temperatures of 60 DEG C; S3, carrying out loading, to be more specific, dispersing composite nanometer metal oxide in microcrystalline cellulose sol to obtain mixed coated sol, adding obtained activated carbon into the mixed coated sol, carrying out pressurization impregnation and adsorption for 1-3 h, carrying out dehydration and then carrying out carbonization again at the temperatures of 150-200 DEG C in nitrogen atmosphere for 1-2 h. The method and the application have the advantages that the nanometermetal oxide can be loaded in activated carbon structures by double means of sol coating and impregnation and adsorption, the method is high in loading and low in energy consumption, the nanometer metal oxide can be completely supported, composite structures can be further reinforced in recarbonization procedures, and the stability can be improved.

Description

technical field [0001] The invention relates to the field of resource development and utilization of waste bio-based materials, and also to the technical field of functional activated carbon, in particular to a method for preparing loaded activated carbon with furfural slag as a raw material and its application. Background technique [0002] 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 other fields. Activated carbon has high surface energy and a well-developed pore structure. It is an excellent medium for loading nanomaterials. At the same time, nano-metal oxides endow activated carbon with special properties. For example, activated carbon introduced with nano-titanium oxide or nano-zirconia has hi...

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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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