| Title: | Highly efficient adsorptive removal of toluene using silicon-modified activated carbon with improved fire resistance |
| Author(s): | Wang J; Wu Z; Niu Q; Liu L; Yang L; Fu M; Ye D; Chen P; |
| Address: | "National Engineering Laboratory for VOCs Pollution Control Technology and Equipment, School of Environment and Energy, South China University of Technology, Guangzhou 510006, China. Shaoguan Chengyi Metallic Materials Technology Corp., Shaoguan 512158, China. National Engineering Laboratory for VOCs Pollution Control Technology and Equipment, School of Environment and Energy, South China University of Technology, Guangzhou 510006, China. Electronic address: chenpr@scut.edu.cn" |
| DOI: | 10.1016/j.jhazmat.2021.125753 |
| ISSN/ISBN: | 1873-3336 (Electronic) 0304-3894 (Linking) |
| Abstract: | "Activated carbons (ACs) are widely applied in the removal of volatile organic compounds (VOCs) emitted from industrial processes, because of their high adsorption capacity, low cost and reusability. Their poor thermal stability under oxidative conditions is a limiting factor and often leads to fire risk in real applications. Here, Si-modification was performed over a wood-derived AC material, and a series of modified ACs with different Si/C mass ratios (0.1-0.9) were prepared via a hydrothermal route. Physicochemical characteristics of Si/C samples was examined by XRD, SEM, TEM, XPS, FTIR and N(2)-physisorption measurements. As compared to pristine AC, Si-modified ACs showed enhanced fire resistance, and an increase of ignition temperature by 79 ?SG was achieved at a Si/C mass ratio of 0.9. A combination of TEM, XPS and FTIR characterization suggests that the formation of amorphous SiO(2) nanoparticles and SiC species on the surface was responsible for the enhanced fire resistance of Si-modified ACs. By increasing microporosity, Si-modification also significantly improved the adsorption capacity of toluene as a model VOC molecule. Static and dynamic adsorption experiments were performed to understand the adsorption kinetics of the Si-modified ACs. Reusability tests showed that the desorption rate of the modified AC remained at nearly 80% even after five cycles of repeated adsorption-desorption, indicating that the modified AC has a great potential for industrial applications" |
| Keywords: | Dynamic adsorption-desorption Ignition temperature Silicon modification VOCs; |
| Notes: | "PubMed-not-MEDLINEWang, Jinyang Wu, Zeng Niu, Qi Liu, Leilu Yang, Leneng Fu, Mingli Ye, Daiqi Chen, Peirong eng Netherlands 2021/06/06 J Hazard Mater. 2021 Aug 5; 415:125753. doi: 10.1016/j.jhazmat.2021.125753. Epub 2021 Mar 26" |
