文章摘要
史盼盼,陈丛瑾.甲基橙在桉木基磁性活性炭上的吸附行为[J].精细化工,2020,37(6):
甲基橙在桉木基磁性活性炭上的吸附行为
Adsorption behavior of methyl orange on the eucalyptus-based magnetic activated carbon
投稿时间:2019-12-05  修订日期:2020-03-11
DOI:
中文关键词: 磁性活性炭  甲基橙  吸附  热力学  动力学
英文关键词: magnetic activated carbon  methyl orange  adsorption  thermodynamics  kinetics
基金项目:国家自然科学基金资助项目(No.31660183);广西石化资源加工及过程强化技术重点实验室开放基金(No.2018k010);广西大学2019“大创计划”国家级创新训练项目(No.33)
作者单位E-mail
史盼盼 广西大学化学化工学院 1373705645@qq.com 
陈丛瑾 广西大学化学化工学院 gxdxccj@163.com 
摘要点击次数: 109
全文下载次数: 0
中文摘要:
      以桉木屑为原料,KOH为活化剂,FeCl3?6H2O为赋磁剂一步法制备了桉木基磁性活性炭。用全自动比表面积及孔径分析仪、FTIR、XRD、VSM等手段对其结构与性能进行了表征与测试。以其为吸附剂,考察了吸附剂用量、甲基橙初始浓度、pH值、吸附时间等对甲基橙吸附效果的影响,并分析了吸附热力学和动力学。结果表明:桉木基磁性活性炭MAC-0.42的比表面积为1430.32 m2/g,总孔体积为0.893 cm3/g,平均孔径为2.49 nm。在吸附剂用量为0.045 g,甲基橙初始质量浓度为0.25 g/L,溶液在自然pH值(约为6.82),吸附时间为10 h条件下,进行了吸附动力学和吸附等温线实验。桉木基磁性活性炭的碘吸附值和亚甲基蓝吸附值分别为1571.4 mg/g和315.52 mg/g。桉木基磁性活性炭表面含有?OH,?C=O,?COO等官能团,其中有磁性物质Fe和Fe3O4,比饱和磁化强度为48.65 emu/g,在外加磁场时能快速将其从溶液中分离出来。其对甲基橙的吸附符合Langmuir模型,最大吸附量为333.33 mg/g; 吸附过程是自发吸热过程,吸附动力学符合准二级动力学模型。
英文摘要:
      Eucalyptus-based magnetic activated carbon was prepared with KOH as activator and FeCl3?6H2O as magnetic agent by one-step method. The structure and properties of the sample were characterized by automatic analyzer of specific surface area and aperture analyzer, FTIR, XRD, and VSM. The adsorption properties of methyl orange on eucalyptus-based magnetic activated carbon were investigated. The effects of adsorbent dosage, initial concentration of methyl orange, pH value and adsorption time on the adsorption effect were investigated. The results showed that the BET specific surface area, pore volume, and average pore diameter of the prepared magnetic activated carbon MAC-0.42 were 1430.32 m2/g, 0.893 cm3/g, and 2.49 nm, respectively. The adsorption kinetics and adsorption isotherm experiments were conducted under the conditions of adsorbent dosage 0.045 g, initial mass concentration of methyl orange 0.25 g/L, pH of the solution (about 6.82), and adsorption time 10 h. The adsorption values of iodine and methylene blue of eucalyptus magnetic activated carbon were 1571.4 mg/g and 315.52 mg/g, respectively. There were —OH,—C=O, and —COO on the surface of the magnetic activated carbon.The sample contained magnetic substances Fe and Fe3O4 with a specific saturation magnetization of 48.65 emu/g, which could be separated from the solution quickly when the magnetic field was applied. The adsorption of methyl orange was consistent with the Langmuir model, and the maximum adsorption capacity was 333.33 mg/g. The adsorption process was a spontaneous endothermic process. The dynamic adsorption behavior of methyl orange was more consistent with the pseudo-second-order kinetic model.
  查看/发表评论  下载PDF阅读器
关闭