| Title: | A strategy for the enhancement of trapping efficiency of gaseous benzene on activated carbon (AC) through modification of their surface functionalities |
| Author(s): | Kim WK; Younis SA; Kim KH; |
| Address: | "Department of Civil and Environmental Engineering, Hanyang University, 222 Wangsimni-ro, Seongdong-Gu, Seoul, 04763, Republic of Korea. Department of Civil and Environmental Engineering, Hanyang University, 222 Wangsimni-ro, Seongdong-Gu, Seoul, 04763, Republic of Korea; Analysis and Evaluation Department, Egyptian Petroleum Research Institute, Nasr City, 11727, Cairo, Egypt; Nanobiotechnology Program, Faculty of Nanotechnology for Postgraduate Studies, Cairo University, Sheikh Zayed Branch Campus, Sheikh Zayed City, Giza, PO 12588, Egypt. Department of Civil and Environmental Engineering, Hanyang University, 222 Wangsimni-ro, Seongdong-Gu, Seoul, 04763, Republic of Korea. Electronic address: kkim61@hanyang.ac.kr" |
| DOI: | 10.1016/j.envpol.2020.116239 |
| ISSN/ISBN: | 1873-6424 (Electronic) 0269-7491 (Linking) |
| Abstract: | "Facile modification is a common, but effective, option to improve the uptake removal capacity of of activated carbon (AC) against diverse target volatile organic compounds (VOCs; e.g., benzene) in gaseous streams. To help design the routes for such modification, this research built strategies to generate three types of modified ACs by incorporating amine/sulfur/amino-silane groups under solvothermal or microwave (MW) thermal conditions. The adsorption performance has been tested using a total of six types of AC sorbents (three modified + three pristine forms) for the capture of 1 Pa benzene (1 atm and 298 K). The obtained results are evaluated in relation to their textural properties and surface functionalities. Accordingly, the enhancement of AC surface basicity (e.g., point of zero charge (PZC) = 10.25), attained via the silylation process, is accompanied by the reduced adsorption of benzene (a weak base). In contrast, ACs amended with amine/sulfur (electron-donating) groups using the MW technique are found to acquire high surface acidity (PZC of 5.99-6.05) to exhibit significantly improved benzene capturing capability (relative to all others). Their uplifted performance is demonstrated in terms of key performance metrics such as breakthrough volume (BTV10%: 163 --> 443 L g(-1)), adsorption capacity (Q10%: 4.82 --> 13.6 mg g(-1)), and partition coefficient (PC10%: 0.516 --> 1.67 mol kg(-1) Pa(-1)). Based on the kinetic analysis, the overall adsorption process is found to be governed by pore diffusion as the main rate-determining step, along with surface interaction mechanisms. The results of this research clearly support the critical role of surface chemistry of AC adsorbents and their textural properties in upgrading air/gas purification systems" |
| Keywords: | Adsorption *Benzene *Charcoal Gases Kinetics Benzene vapor adsorption Breakthrough analysis Commercial activated carbon Kinetic modeling Surface modification strategies; |
| Notes: | "MedlineKim, Won-Ki Younis, Sherif A Kim, Ki-Hyun eng England 2020/12/21 Environ Pollut. 2021 Feb 1; 270:116239. doi: 10.1016/j.envpol.2020.116239. Epub 2020 Dec 11" |
