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首页> 外文期刊>Environmental Science & Technology >Gas-Phase Formaldehyde Adsorption Isotherm Studies on Activated Carbon: Correlations of Adsorption Capacity to Surface Functional Group Density
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Gas-Phase Formaldehyde Adsorption Isotherm Studies on Activated Carbon: Correlations of Adsorption Capacity to Surface Functional Group Density

机译：活性炭的气相甲醛吸附等温线研究：吸附容量与表面官能团密度的关系

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摘要

Formaldehyde (HCHO) adsorption isotherms were developed for the first time on three activated carbons representing one activated carbon fiber (ACF) doth, one all-purpose granular activated carbon (GAC), and one GAC commercially promoted for gas-phase HCHO removal. The three activated carbons were evaluated for HCHO removal in the low-ppmv range and for water vapor adsorption from relative pressures of 0.1-0.9 at 26 °C where, according to the I UP AC isotherm classification system, the adsorption isotherms observed exhibited Type V behavior. A Type V adsorption isotherm model recently proposed by Qi and LeVan (Q—L) was selected to model the observed adsorption behavior because it reduces to a finite, nonzero limit at low partial pressures and it describes the entire range of adsorption considered in this study. The Q—L model was applied to a polar organic adsorbate to fit HCHO adsorption isotherms for the three activated carbons. The physical and chemical characteristics of the activated carbon surfaces were characterized using nitrogen adsorption isotherms, X-ray photoelectron spectroscopy (XPS), and Boehm titrations. At low concentrations, HCHO adsorption capacity was most strongly related to the density of basic surface functional groups (SFGs), while water vapor adsorption was most strongly influenced by the density of acidic SFGs.
机译：甲醛（HCHO）吸附等温线首次在代表一种活性炭纤维（ACF）的一种活性炭，一种通用的颗粒状活性炭（GAC）和一种商业上推广用于气相HCHO去除的GAC上开发。评估了三种活性炭在低ppmv范围内的HCHO去除率以及在26°C下相对压力为0.1-0.9时水蒸气的吸附情况，根据I UP AC等温线分类系统，观察到的吸附等温线为V型行为。选择了由Qi和LeVan（QL）最近提出的V型吸附等温线模型来对观察到的吸附行为进行建模，因为它在低分压下降低到有限的非零极限，并且描述了本研究中考虑的整个吸附范围。将Q-L模型应用于极性有机吸附物，以拟合三种活性炭的HCHO吸附等温线。使用氮吸附等温线，X射线光电子能谱（XPS）和Boehm滴定来表征活性炭表面的物理和化学特性。在低浓度下，HCHO的吸附能力与碱性表面官能团（SFGs）的密度关系最密切，而水蒸气的吸附则受酸性SFGs的密度影响最大。

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  • 来源
    《Environmental Science & Technology》 |2011年第15期|p.6498-6503|共6页
  • 作者

    Ellison M. Carter; Lynn E. Katz; Gerald E. Speitel; David Ramirez;

  • 作者单位

    Department of Civil, Architectural, and Environmental Engineering, University of Texas at Austin, Cockrell School of Engineering,1 University Station C1786, Austin, Texas 78712-0284, United States;

    Department of Civil, Architectural, and Environmental Engineering, University of Texas at Austin, Cockrell School of Engineering,1 University Station C1786, Austin, Texas 78712-0284, United States;

    Department of Civil, Architectural, and Environmental Engineering, University of Texas at Austin, Cockrell School of Engineering,1 University Station C1786, Austin, Texas 78712-0284, United States;

    Department of Environmental Engineering, Texas A & M University at Kingsville, Dotterweich College of Engineering,700 University Boulevard MSC 213, Kingsville, Texas 78363, United States;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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