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．