| Title: | Role of molecular size of volatile organic compounds on their adsorption by KOH-activated micro-mesoporous carbon |
| Author(s): | Liu X; Zhu H; Wu W; Lin D; Yang K; |
| Address: | "Department of Environmental Science, Zhejiang University, Hangzhou 310058, China. Department of Environmental Science, Zhejiang University, Hangzhou 310058, China; Zhejiang Provincial Key Laboratory of Organic Pollution Process and Control, Hangzhou 310058, China. Department of Environmental Science, Zhejiang University, Hangzhou 310058, China; Zhejiang Provincial Key Laboratory of Organic Pollution Process and Control, Hangzhou 310058, China; Zhejiang University-Hangzhou Global Scientific and Technological Innovation Center, Hangzhou 311200, China. Electronic address: kyang@zju.edu.cn" |
| DOI: | 10.1016/j.jhazmat.2021.127355 |
| ISSN/ISBN: | 1873-3336 (Electronic) 0304-3894 (Linking) |
| Abstract: | "KOH-activated carbon (KAC) with high surface area and abundant micropores are widely used in adsorbing volatile organic compounds (VOCs). Kinetic diameters (sigma) of VOCs are an important factor controlling diffusion of VOCs into pores of adsorbent. Yet the influence of kinetic diameters of VOCs on their adsorption by KAC remains unclear. Here, we investigated the dynamic adsorption of VOCs with various kinetic diameters on a prepared KAC with high surface area of 3100 m(2)/g, pore volume of 2.08 cm(3)/g and average pore width (D) of 2.68 nm. Adsorption affinity was negatively correlated with size difference (D-sigma), indicating that pore width of adsorbent should close to sigma to obtain a strong interaction between VOCs and adsorbents. Amounts adsorbed were positively correlated with sigma at low relative pressures (p/p(0) < 0.01), and negatively correlated with sigma at high relative pressures (p/p(0) > 0.044). The above results suggest that larger molecules with higher affinities are preferentially adsorbed at low relative pressures, amounts adsorbed of smaller molecules are larger than that of bigger molecules at high relative pressures. This study provided new insights into adsorption mechanisms mediated by sigma and the development of next generation adsorbents for efficient removal of VOCs" |
| Keywords: | Adsorption *Charcoal Diffusion Kinetics *Volatile Organic Compounds Activated carbon Molecular kinetic diameter Volatile organic compounds; |
| Notes: | "MedlineLiu, Xianyu Zhu, Hongxia Wu, Wenhao Lin, Daohui Yang, Kun eng Research Support, Non-U.S. Gov't Netherlands 2021/10/13 J Hazard Mater. 2022 Feb 15; 424(Pt B):127355. doi: 10.1016/j.jhazmat.2021.127355. Epub 2021 Sep 29" |
