饱和吸附2,4-二硝基甲苯后活性炭的电化学再生

以2,4-二硝基甲苯为吸附物,对吸附饱和的活性炭进行电化学再生,考察了再生时间、电流密度、体系pH、电解质NaCl质量浓度等对再生效果的影响。最佳的电化学再生工艺条件为电解质NaCl质量浓度15.0 g/L,电流密度20 mA/cm~2,体系pH为 5,再生时间2 h,在此条件下活性炭再生率可达102.57%。再生前后活性炭的微孔结构基本不变,微孔孔径分布于0.3～1.0 nm。再生后活性炭的比表面积增大,石墨化程度提高,表面含氧基团含量增加,总氧含量增加,碳含量有所下降。

Electrochemical regeneration of activated carbon adsorbed and saturated by 2,4-dinitrotoluene

The activated carbon adsorbed and saturated by 2,4-dinitrotoluene was regenerated by electrochemical method. The factors affecting regeneration were investigated,such as：regeneration time,current density,system pH and mass concentration of electrolyte NaCl. The results show that under the optimum conditions of electrolyte NaCl mass concentration 15 g/L ,current density 20 mA/cm² ,system pH value 5 and regeneration time 2 h,the regeneration rate of activated carbon can reach 102.57%. The cellular structure of the regenerated activated carbon maintained almost the same with the pore size of 0.3-1.0 nm. The regenerated activated carbon had increased specific surface area,increased graphitization degree,increased oxygen-containing groups,increased total oxygen content and decreased carbon content.