Page 199 - 《精细化工》2020年第6期

第 37 卷第 6 期 精 细 化 工 Vol.37, No.6
202 0 年 6 月 FINE CHEMICALS June 2020

水处理技术与环境保护
甲基橙在桉木基磁性活性炭上的吸附行为

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史盼盼，黄 钦，米 帅，李钟兴，盘钊金，陈丛瑾
（广西大学 化学化工学院，广西石化资源加工及过程强化技术重点实验室，广西 南宁 530004）

摘要：以桉木屑为原料，KOH 为活化剂，FeCl 3 ·6H 2 O 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。
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结果表明，桉木基磁性活性炭 MAC-0.42 的比表面积为 1430.32 m /g，总孔体积为 0.893 cm /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（约为 6.82）、吸附时间为 10 h
的条件下，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
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 Fe 3 O 4 ，
MAC-0.42 的饱和磁化强度为 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。
关键词：磁性活性炭；甲基橙；吸附；热力学；动力学；水处理技术与环境保护
中图分类号：TK6; X72; TQ424.1 文献标识码：A 文章编号：1003-5214 (2020) 06-1265-09

Adsorption behavior of methyl orange on the eucalyptus-based

magnetic activated carbon

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SHI Panpan, HUANG Qin, MI Shuai, LI Zhongxing, PAN Zhaojin, CHEN Congjin
（Guangxi Key Laboratory of Petrochemical Resource Processing and Process Intensification Technology, School of
Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, Guangxi, China）

Abstract: Eucalyptus-based magnetic activated carbon was prepared with KOH as activator and
FeCl 3·6H 2O 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
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average pore diameter of the prepared magnetic activated carbon MAC-0.42 were 1430.32 m /g, 0.893 cm /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-based magnetic activated carbon were 1571.4 and 315.52 mg/g, respectively. There were —OH,
—C==O, and —COO on the surface of the magnetic activated carbon.The MAC-0.42 contained magnetic
substances Fe and Fe 3O 4 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 by
MAC-0.42 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

收稿日期：2019-12-05; 定用日期：2020-03-16; DOI: 10.13550/j.jxhg.20191140
基金项目：国家自然科学基金（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（2018k010）；广西大学 2019“大
创计划”国家级创新训练项目（No.33）
作者简介：史盼盼（1991—），女，硕士生，E-mail：1373705645@qq.com。联系人：陈丛瑾（1970—），教授，E-mail：gxdxccj@163.com。