CAJ | 학술논문

以瓦花米草为原料,经过碳化、KOH活化两步法制备了低成本、高比表面的微孔活性炭SAAC.通过静态实验研究了活性炭SAAC对水溶液中对硝基苯胺的吸附特性,并从动力学角度探讨了吸附机理.结果表明,微孔活性炭SAAC对对硝基苯胺吸附动力学数据符合准二级方程,吸附速率在前25min由内扩敝拄制,而后由膜扩散与内扩散共同控制.Freundlich方程能更好地描述对硝基苯胺在活性炭SAAC 上的等温吸附行为;在15℃时,活性炭SAAC对对硝基苯胺的Langmuir最大吸附量为719mg/g.
이와화미초위원료,경과탄화、KOH활화량보법제비료저성본、고비표면적미공활성탄SAAC.통과정태실험연구료활성탄SAAC대수용액중대초기분알적흡부특성,병종동역학각도탐토료흡부궤리.결과표명,미공활성탄SAAC대대초기분알흡부동역학수거부합준이급방정,흡부속솔재전25min유내확폐주제,이후유막확산여내확산공동공제.Freundlich방정능경호지묘술대초기분알재활성탄SAAC 상적등온흡부행위;재15℃시,활성탄SAAC대대초기분알적Langmuir최대흡부량위719mg/g.
Low-cost activated carbon was prepared from Spartina alterniflora from a two-step thermo-chemical process by KOH activation. The adsorption equilibrium and kinetic behavior ofp-nitroaniline onto the carbon was investigated by conducting a series of batch adsorption experiments, and adsorption mechanism was discussed from kinetic point of view. The pseudo-second-order model was found to explain the adsorption kinetics most effectively. It was also found that the pore diffusion played an important role in the adsorption, and intra-particle diffusion was the rate-limiting step at the first 25 min for the temperatures of 15, 25 and 35℃. The Freundlich isotherm was found to best describe the experimental data. The maximum adsorption capacity ofp-nitroaniline was found to be 719 mg/g for initial p-nitroaniline concentration of 200 mg/L at 15℃.