酸、碱改性活性炭对甲醇、甲苯吸附性能

摘要分别采用硝酸和氢氧化钠对活性炭进行改性，利用比表面积及孔径分析仪（BET）、扫描电镜（SEM）、Boehm滴定法对活性炭物化性质进行表征，测试改性活性炭对甲醇、甲苯吸附性能。结果表明，经过酸、碱改性后的活性炭比表面积、总孔容、微孔孔容均有所增大。酸改性表面酸性基团增加，碱改性后活性炭酸性基团减少。酸改性后的活性炭对甲醇、甲苯吸附能力有所下降，后经碱改性的活性炭吸附能力均有不同程度的提高。单组分吸附实验时，甲醇穿透曲线斜率要大于甲苯，穿透时间早于甲苯。在多组分吸附过程中会出现甲苯取代甲醇的吸附现象，使得已经被吸附的甲醇发生脱附，此时甲醇的出口浓度大于进口浓度，形成峰值效应。

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	庞维亮
	胡柏松
	程丹丹
	邢国政
	冯丽霞
	魏铮

关键词：活性炭；改性；吸附；甲醇；甲苯

Abstract： The activated carbon was modified with nitric acid and sodium hydroxide respectively, and the physicochemical properties of the activated carbon were characterized by specific surface area and pore size analyzer (BET), scanning electron microscope (SEM) and Boehm titration. The adsorption performance of modified activated carbon for methanol and toluene was tested. The results show that the specific surface area, total pore volume and micro-pore volume of activated carbon modified by acid and alkali are increased. The number of acidic groups on the surface is increased after acid-modification, and after the alkali modification, the activated carbon acid groups are reduced. The adsorption capacity of methanol and toluene is decreased for acid-modified activated carbon, and for the alkali-modified activated carbon, the adsorption capacity is improved to varying degrees. For single-component adsorption experiments, the slope of methanol breakthrough curve is greater than that of toluene and the breakthrough time is earlier than that of toluene. In the process of multi-component adsorption, replacement adsorption of toluene to methanol occurs, so that the adsorbed methanol is desorbed.

Keywords： activated carbon； modified； adsorbed； methanol； toluene

Received 2018-02-09;

Corresponding Authors: 胡柏松,E-mail:hubaisong@hebut.edu.cn Email: hubaisong@hebut.edu.cn

About author: 庞维亮(1981-),男,硕士研究生,工程师,现从事大气污染防治方面的研究。

引用本文:

庞维亮, 胡柏松, 程丹丹, 邢国政, 冯丽霞, 魏铮.酸、碱改性活性炭对甲醇、甲苯吸附性能[J]. 化学工业与工程, 2018,35(6): 48-53

Pang Weiliang, Hu Baisong, Cheng Dandan, Xing Guozheng, Feng Lixia, Wei Zheng.Adsorption of Methanol and Toluene onto Activated Carbon with Acid-Base Modified[J]. Chemcial Industry and Engineering, 2018,35(6): 48-53

[1] 邢国政, 李慧, 李涛, 等. 吸附法处理甲苯废气的工程实例[J]. 环境工程, 2016, 34(S1):523-525 Xing Guozheng, Li Hui, Li Tao, et al. The case of dimethyl benzene gas treatment by using absorber material[J]. Environmental Engineering, 2016, 34(S1):523-525(in Chinese)
[2] 律国黎. 制药行业挥发性有机物(VOCs)污染特性研究[D]. 石家庄:河北科技大学, 2013 Lv Guoli. Studies on the pollution characteristics of volatile organic compounds (VOCs) from pharmaceutical industry[D]. Shijiazhuang:Hebei University of Science and Technology, 2013(in Chinese)
[3] Bansode R R,Losso J N, Marshall W E, et al. Adsorption of volatile organic compounds by pecan shell and almond shell-based granular activated carbon[J].Bioresource Technology, 2003, 90(2):175-184
[4] André L C, Alexandro M M V, Eurica M N, et al. NaOH-Activated carbon of high surface area produced from coconut shell:Kinetics and equilibrium studies from the methylene blue adsorption[J]. Chemical Engineering Journal, 2011, 174(1):117-125
[5] Jeong H B, Jae H P, Ki-Y Yoon, et al. Removal of volatile organic compounds by spark generated carbon aerosol particles[J]. Carbon, 2006, 44(10):2089-2108
[6] 曹晓强, 张浩, 黄学敏.微波解吸-催化燃烧净化甲苯研究[J]. 环境科学, 2013, 34(7):2546-2551 Cao Xiaoqiang, Zhang Hao, Huang Xuemin. Combination process of microwave desorption-catalytic combustion for toluene treatment[J]. Environmental science, 2013, 34(7):2546-2551(in Chinese)
[7] Vivo-Vilches J F, Bailón-García E, Pérez-Cadenas A F, et al. Tailoring the surface chemistry and porosity of activated carbons:Evidence of reorganization and mobility of oxygenated surface groups[J]. Carbon, 2014, 68:520-530
[8] Li L, Liu S, Liu J. Surface modification of coconut shell based activated carbon for the improvement of hydrophobic VOC removal[J]. Journal of Hazardous Materials, 2011, 192(2):683-690
[9] Jaramillo J, Álvarez-Pedro M, Gómez-Serrano V. Oxidation of activated carbon by dry and wet methods surface chemistry and textural modification[J]. Fuel Processing Technology, 2010, 91(11):1768-1775
[10] Yang T, Luo S, Xu Y. Characterization of pore structure based on N₂ adsorption applied to porous materials[J]. Carbon, 2006, (1):17-22
[11] Boehm H P. Surface oxides on carbon and their analysis:Acritical assessment[J]. Carbon, 2002, 40(2):145-149
[12] 刘寒冰, 杨兵, 薛南冬. 酸碱改性活性炭及其对甲苯吸附的影响[J]. 环境科学, 2016, 37(9):3670-3678 Liu Hanbing, Yang Bing, Xue Nandong. Effects of acidic and basic modification on activated carbon for adsorption of toluene[J]. Environmental Science, 2016, 37(9):3670-3678(in Chinese)
[13] 范延臻, 王宝贞, 王琳, 等. 改性活性炭对有机物的吸附性能[J]. 环境化学, 2001, 20(5):444-448 Fan Yanzhen, Wang Baozhen, Wang Lin, et al. Adsorption of organic micropollutants on modified activated carbons[J]. Environmental Chemistry, 2001, 20(5):444-448(in Chinese)
[14] 李立清, 梁鑫, 石瑞, 等. 酸改性活性炭对甲苯、甲醇的吸附性能[J]. 化工学报, 2013, 64(3):970-979 Li Liqing, Liang Xin, Shi Rui, et al. Adsorption of toluene and methanol onto activated carbons with acid modification[J]. CIESC Journal, 2013, 64(3):970-979(in Chinese)