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利用微波辐照作为改性手段,在450℃、N2气氛下对椰壳基颗粒活性炭进行了改性研究,测定了活性炭改性前后对甲苯的吸附性能。结果表明:微波改性后,单位质量活性炭(1 g)对甲苯的吸附能力由182 mg提高到193 mg;试验中,吸附床层的穿透时间由2.5 h提高至3.5 h。改性活性炭的表面碱性官能团含量、比表面积、孔容积、碘吸附值均比未改性活性炭有所提高,而表面酸性官能团含量则较未改性活性炭有所降低。试验分析结果表明:微波加热对活性炭孔道的清理作用提高了其物理吸附性能并且在试验中起主导作用;还原性气氛下高温加热导致的表面碱性官能团含量增加提高了其化学吸附性能。
Using microwave irradiation as a modification method, the coconut shell granular activated carbon was modified at 450 ℃ and N2 atmosphere, and the adsorption performance of toluene on the activated carbon before and after the modification was measured. The results showed that the adsorption capacity of toluene per unit mass of activated carbon (1 g) increased from 182 mg to 193 mg after microwave modification. In the experiment, the breakthrough time of adsorption bed increased from 2.5 h to 3.5 h. The content of basic functional groups, specific surface area, pore volume and iodine adsorption of modified activated carbon were all higher than that of unmodified activated carbon, while the content of surface acidic functional groups was lower than that of unmodified activated carbon. The experimental results show that the microwave heating can improve the physical adsorption of activated carbon channels and play a leading role in the experiment. The increase of surface basic functional groups caused by high temperature heating in reducing atmosphere enhances the chemisorption performance.