Abstract: Coal humic acid is a natural aromatic polymer in low-rank coal and has the characteristics of high carbon content, loose sponge texture, abundant reserves and low cost, etc., which makes it a new carbon precursor for the preparation of activated carbon. In this paper, humic acid-based activated carbon was prepared by chemical activation method using humic acid extracted from lignite as precursor, and its adsorption performance on methylene blue was studied. The physical and chemical properties of the activated carbon were characterized by scanning electron microscopy, BET surface spectrometer and Fourier transform infrared spectrometer. The effects of solution pH, adsorbent dosage, initial concentration, temperature and ionic strength on the adsorption performance of activated carbon were investigated. The results show that the humic acid-based activated carbon had a large specific surface area (2 370.21 m2/g), rich pore structure and oxygen-containing functional groups, which were beneficial to the adsorption of methylene blue. The Langmuir model was more suitable to describe the adsorption behavior of activated carbon on methylene blue. According to the Langmuir isotherm model fitting, the maximum adsorption capacity of activated carbon on methylene blue at 298 K was 970.87 mg/g. Compared with the adsorption properties of activated carbon methylene blue prepared from different precursors, the activated carbon prepared from humic acid showed obviously good adsorption properties for methylene blue. The pseudo-second-order kinetic model could better describe the adsorption of methylene blue on activated carbon. The adsorption of methylene blue by activated carbon was a spontaneous and endothermic process. After 5 cycles of recycling, the adsorption capacity of activated carbon on methylene blue has decreased, but the removal rate of activated carbon in the recycling reached more than 93%, indicating that the recycling performance of activated carbon was good.
通讯作者:
* 董宪姝,太原理工大学矿业工程学院教授、博士研究生导师。目前主要从事矿物加工理论、工艺与设备的研发,煤炭脱硫及伴生矿物的高值化利用等研究和教学工作。现主持国家自然科学基金-国际(地区)合作与交流项目1项、国家自然科学基金1项、山西省重点研发-国际科技合作项目1项,参与国家自然青年基金2项、山西省自然科学基金青年基金项目1项,承担企业科技合作项目30余项。发表论文90余篇,包括Fuel、Mineral Engineering、Colloids and Surfaces A-Physicochemical and Engineering Aspects等。授权发明专利10余项,参与制定选煤标准2项。dxshu520@163.com
侯金瑛, 董宪姝, 马晓敏, 樊玉萍, 姚素玲. 腐植酸基活性炭对亚甲基蓝的吸附性能研究[J]. 材料导报, 2023, 37(22): 22020042-7.
HOU Jinying, DONG Xianshu, MA Xiaomin, FAN Yuping, YAO Suling. Study on the Adsorption Performance of Humic Acid-based Activated Carbon for Methylene Blue. Materials Reports, 2023, 37(22): 22020042-7.
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2023, Vol. 37 
