天然有机化合物对多壁碳纳米管吸附甲苯和乙苯的影响。
The effect of natural organic compounds on the adsorption of toluene and ethylene benzene on MWCNT.
作者信息
Abedi Zahra, Assadi Ali, Farahmandkia Zohreh, Mehrasebi Mohammad Reza
机构信息
Department of Environmental Health, School of Public Health, Zanjan University of Medical Sciences, Parvin Etesami St., Faculty of Health, Zanjan, Iran.
出版信息
J Environ Health Sci Eng. 2019 Dec 27;17(2):1055-1065. doi: 10.1007/s40201-019-00420-8. eCollection 2019 Dec.
PURPOSE
The present study aimed to investigate the effect of humic acid (as a NOM model) on the adsorption capacity of MWCNT.
METHODS
Ethyl benzene and toluene were removed from aqueous solution and adsorbed on multi walled carbon nanotubes in batch adsorption experiments at the presence of different concentrations of humic acid.
RESULTS
The results showed that the highest adsorption of multi walled carbon nanotubes was 72 mg/g for ethyl benzene and 35 mg/g for toluene in an aqueous solution without humic acid. Langmuir isotherm model and pseudo-second-order kinetic model were the predominant models of adsorption process. Pre-loading of humic acid on MWCNT reduced the adsorption capacity of MWCNT from 14 mg/g to 8 mg/g for toluene and from 25 mg/g to 10 mg/g for ethyl benzene, when the experiments were conducted with MWCNT pre-loaded by humic acid from 0 to 30% .
CONCLUSIONS
The batch adsorption experiments showed that the presence of dissolved humic acid in the aqueous environment slightly affected the adsorption of ethyl benzene and toluene by MWCNT but, Pre-loading of humic acid on MWCNT could reduce the adsorption capacity of multi walled carbon nanotubes.
目的
本研究旨在探究腐殖酸（作为天然有机物模型）对多壁碳纳米管吸附能力的影响。
方法
在不同浓度腐殖酸存在的情况下，通过批量吸附实验从水溶液中去除乙苯和甲苯，并使其吸附在多壁碳纳米管上。
结果
结果表明，在无腐殖酸的水溶液中，多壁碳纳米管对乙苯的最高吸附量为72毫克/克，对甲苯的最高吸附量为35毫克/克。朗缪尔等温线模型和准二级动力学模型是吸附过程的主要模型。当用0%至30%腐殖酸预负载的多壁碳纳米管进行实验时，腐殖酸在多壁碳纳米管上的预负载使多壁碳纳米管对甲苯的吸附能力从14毫克/克降至8毫克/克，对乙苯的吸附能力从25毫克/克降至10毫克/克。
结论
批量吸附实验表明，水环境中溶解的腐殖酸的存在对多壁碳纳米管吸附乙苯和甲苯的影响较小，但腐殖酸在多壁碳纳米管上的预负载会降低多壁碳纳米管的吸附能力。
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