CAJ | 학술논문

以玻璃炭球为原料,采用在干燥空气流中500℃高温热处理3 h(第一步活化处理),而后在415℃低温处理不同时间(第二步活化处理)的两步活化法制取了一系列活性炭球.依据77 K N2吸/脱附等温线,应用BET、αs-plot和BJH法测定了所得活性炭球的孔结构.结果表明:第一步活化处理后,在炭球表面生成少量大孔(中孔甚至大孔),这些大孔是第二步活化时活化气体(空气)的扩散入口,使得第二步活化处理时微孔的生成量增加.由此可以认为这种二步活化法是获得高收率的较高比面积和微孔容积活性炭的一种有效途径.
이파리탄구위원료,채용재간조공기류중500℃고온열처리3 h(제일보활화처리),이후재415℃저온처리불동시간(제이보활화처리)적량보활화법제취료일계렬활성탄구.의거77 K N2흡/탈부등온선,응용BET、αs-plot화BJH법측정료소득활성탄구적공결구.결과표명:제일보활화처리후,재탄구표면생성소량대공(중공심지대공),저사대공시제이보활화시활화기체(공기)적확산입구,사득제이보활화처리시미공적생성량증가.유차가이인위저충이보활화법시획득고수솔적교고비면적화미공용적활성탄적일충유효도경.
A series of activated carbons was prepared using a two-step activation process. The starting glass-like carbon spheres were heated at 500 ℃ for 3 h ( first step activation), and then at a low temperature, below 415 ℃, for different times ( second step activation), in a flow of dry air. Their pore structures were evaluated from N2 gas adsorption/desorption isotherms at 77 K by BET, αs-plot and BJH methods. The first step of activation generated a few large pores ( mesopores and even macropores), on the surface of the spheres, which formed the entrance for the activating reagent gas( air), to increase micropores at a low temperature in the second step of activation. This two-step activation process was found to be an efficient approach to get a comparatively high surface area and a volume of micropores with a high activation yield.