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在氮气气氛下对活性炭进行1 000℃高温热处理,研究了高温处理前后活性炭微观结构和表面化学性质的变化。低温(77 K)N2吸附结果表明,经高温处理后活性炭比表面积和孔容增加,增长率分别达59.2%和83.3%。通过密度函数理论解析热处理前后活性炭的孔径分布得出,高温热处理后活性炭2~4 nm的孔体积明显增加。Boehm滴定和红外光谱分析结果表明,对活性炭进行高温热处理会使活性炭表面不饱和键断裂,含氧酸基团热解,降低活性炭表面酸性基团数量。
The activated carbon was heat treated at 1000 ℃ in nitrogen atmosphere. The microstructure and surface chemical properties of activated carbon before and after high temperature treatment were studied. The results of N2 adsorption at low temperature (77 K) showed that the specific surface area and pore volume of activated carbon increased after high temperature treatment, and the growth rates were 59.2% and 83.3% respectively. The pore size distribution of activated carbon before and after heat treatment was analyzed by density function theory. The pore volume of activated carbon at 2-4 nm increased obviously after high temperature heat treatment. The results of Boehm titration and FTIR analysis show that high temperature heat treatment on activated carbon can rupture the unsaturated bond on the surface of active carbon and pyrolyze the oxoacid groups to reduce the number of acid groups on the surface of activated carbon.