离子束辐照活性炭吸附性能研究

利用离子束注入机对活性炭进行N+辐照改性,使用场发射扫描电子显微镜(FESEM)、拉曼光谱仪(Raman)对活性炭表面形貌、结构等特性进行表征,研究了改性后活性炭对亚甲基蓝(MB)吸附性能的变化。实验表明:活性炭经离子束辐照后,比表面积和石墨化程度均降低,对亚甲基蓝的吸附能力降低,且辐照剂量增大,吸附能力减小。在活性炭浓度为0.667 g/L,吸附时间为360 min,振荡器频率为250 r/min,吸附温度为308 K时,活性炭对亚甲基蓝的吸附量为249.081 mg/g,改性活性炭(剂量为40 000 dose)在同等条件下吸附量为241.726 mg/g。改性活性炭对亚甲基蓝吸附过程符合Langmuir和Freundlich吸附等温模型。

STUDY ON ADSORPTION PROPERTIES OF ACTIVATED CARBON IRRADIATED BY ION BEAM

In this study，activated carbon was modified by N + irradiation in the ion beam irradiation device． The morphology and structure of activated carbon were characterized by field emission scanning electron microscopy ( FESEM) and Raman spectrometer ( Raman) ． The variation of adsorption properties of methylene blue ( MB) onto activated carbon after N + irradiation was investigated． The results showed the ion beam modification could decrease the specific surface area，the degree of graphitization and the adsorption capacity of activated carbon． The adsorption capacity reduced as the irradiation dose increased． In the experiment，when the concentration of activated carbon was 0. 667 g /L，the adsorption time was 360 min， the oscillation frequency of constant temperature oscillator was 250 r /min，and the adsorption temperature was of 308 K，the adsorption capacity of MB onto activated carbon was 249. 081 mg /g，while that of the modified activated carbon with 40 000 dose was 241. 726 mg /g． The adsorption process of MB onto modified activated carbon accorded well with Langmuir and Freundlich adsorption isotherm models．