From the TG curve of the coconut shell raw material, the coconut shell rapidly decomposes at 240-400 ° C, which produces a large amount of organic volatiles and tar, leaving solid carbon. At this stage, no pores of activated carbon are formed.
From the TG curve of the coconut shell raw material, the coconut shell rapidly decomposes at 240-400 ° C, which produces a large amount of organic volatiles and tar, leaving solid carbon. At this stage, no pores of activated carbon are formed. In the 400-900 °C stage, the pyrolysis rate is slow. At this stage, the solid carbon undergoes a polycondensation reaction, and the thermal decomposition product is aromatized to form microcrystalline carbon. At about 900 °C, the coconut shell microcrystalline carbon undergoes structural reforming at high temperatures, and the pores between the crystallites form micropores of activated carbon. The effect of high temperature reforming on the pore structure of coconut shell structure was investigated by pyrolysis of coconut shell raw materials at 400 ° C and 900 ° C respectively. Before the experiment, the reaction system was sealed to prevent the air from entering the coconut shell material and the shelling reaction occurred, and the solid carbon was burned out.
The experimental preparation of coconut shell activated carbon pyrolysis conditions is: in the case of system sealing, 400 ° C for 4 h, labeled AC-400; 900 ° C for 4 h, labeled AC-900, its adsorption performance shows high temperature pyrolysis activated AC The iodine adsorption value of -900 reached 1194 mg/g, and the methylene blue adsorption value was 105 mg/g, which was much higher than the adsorption performance of AC-400 prepared by low temperature pyrolysis. This indicates that under the system closed condition, after 900 ° high temperature pyrolysis for 4 h It significantly promotes the formation and development of micropores during carbonization. This is because in a closed system, coconut shell char is pyrolyzed at high temperatures, resulting in a decrease in the content of heteroatoms (oxygen, hydrogen), bond breakage between the heteroatom oxygen and the aromatic wafer, rearrangement of the crystallite structure, and degree of graphitization. Improved, a material similar to a carbon molecular sieve having a well-developed pore size and uniform pore size can be obtained.
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