Biomass-based magnetic activated carbon and preparation method thereof

Abstract

The invention relates to biomass-based magnetic activated carbon and a preparation method thereof. The method includes: dissolving a certain amount of ZnCl2 into water to obtain a solution A, dissolving Fe(NO3)3 9H2O and dodecyl trimethyl ammonium chloride into water according to a certain mass proportion, subjecting to water bath at 80 DEG C for half an hour to obtain a solution B, impregnating waste biomass in the mixed solution of the solution A and the solution B for a certain period of time, drying in a drying oven of 105 DEG C, weighing a certain mass of the dried material, and activating the weighed material in a resistance furnace under certain system pressure and activation temperature for a certain period of time; boiling the activation product in boiling water for half an hour,washing with deionized water until the activation product is neutral, filtering, drying, and grinding to obtain the magnetic activated carbon. The preparation method has the advantages that the methodis simple in preparation process, low in cost and the like; the magnetic activated carbon prepared by the method is excellent in magnetic performance, less prone to magnetic substance falling off andexcellent in adsorption performance.

Description

technical field [0001] The invention relates to a method for preparing magnetic activated carbon and magnetic activated carbon prepared by the method. Background technique [0002] Agricultural and forestry wastes are derived from plants and are mainly composed of C, H, O, N, etc. They are the products of plant photosynthesis and are renewable and sustainable. my country is a large country producing agriculture and forestry, with abundant agricultural and forestry resources. In addition to a part of agricultural and forestry wastes in my country being used for power generation and other energy utilization, a large part is abandoned or incinerated. Using waste biomass to prepare activated carbon can not only reduce environmental pressure , can also increase economic benefits. [0003] Due to its high specific surface area, rich pore structure, and excellent adsorption performance, activated carbon is widely used in various fields, such as medical pharmaceuticals, chemical pro...

AI Technical Summary

Problems solved by technology

Both of the above two methods use the "two-step method" to prepare magnetic activated carbon, and the temperature required for the preparation process is very high. Not only the preparation process is complicated, but also the high preparation temperature greatly increases the production cost.

Another example is that the patent application number is 200910077154.X, and the name is: "a preparation method of magnetic activated carbon and the magnetic activated carbon". Fully mixed with surfactants to form a mixture, pressurized and dried, then carbonized the dried molded product at a temperature of 400-700°C to make a carbonized product, and then activated the carbonized product at a temperature of 700-1000°C to prepare magnetic activated carbon , this method uses a binder, which is easy to cause pore blocking, thereby reducing the adsorption performance of activated carbon

[0004] To sum up, the current preparation of magnetic activated carbon mainly has problems such as high preparation temperature, uneconomical, complicated preparation process, poor magnetic properties, easy falling off of magnetic substances, and poor adsorption performance of the prepared magnetic activated carbon.

Although there are currently researches and one-step methods to prepare magnetic activated carbon, when impregnating the raw materials, the raw materials are first impregnated with the activator, then mixed with the magnetizer, and then dried. Because a certain amount of water is required to dissolve the magnetic agent and the surface Active agent, drying this part of the water will consume more time and energy