| Title: | Adsorption of acetone and cyclohexane onto CO(2) activated hydrochars |
| Author(s): | Zhang X; Xiang W; Wang B; Fang J; Zou W; He F; Li Y; Tsang DCW; Ok YS; Gao B; |
| Address: | "School of Environmental Engineering, Jiangsu Key Laboratory of Industrial Pollution Control and Resource Reuse, Xuzhou University of Technology, Xuzhou, 221018, PR China; Department of Agricultural and Biological Engineering, University of Florida, Gainesville, FL, 32611, USA; Jiangsu Key Laboratory of Vehicle Emissions Control, Center of Modern Analysis, Nanjing University, Nanjing, 210093, PR China. School of Environmental Engineering, Jiangsu Key Laboratory of Industrial Pollution Control and Resource Reuse, Xuzhou University of Technology, Xuzhou, 221018, PR China; Department of Agricultural and Biological Engineering, University of Florida, Gainesville, FL, 32611, USA. State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry Chinese Academy of Sciences, Guiyang, 550081, PR China. Department of Agricultural and Biological Engineering, University of Florida, Gainesville, FL, 32611, USA. Jiangsu Key Laboratory of Vehicle Emissions Control, Center of Modern Analysis, Nanjing University, Nanjing, 210093, PR China. College of Environment, Zhejiang University of Technology, Hangzhou, 310014, China. Tropical Research and Education Center, University of Florida, Homestead, FL, 33031, USA. Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, China. Korea Biochar Research Center & Division of Environmental Science and Ecological Engineering, Korea University, Seoul, 02841, Republic of Korea. Department of Agricultural and Biological Engineering, University of Florida, Gainesville, FL, 32611, USA. Electronic address: bg55@ufl.edu" |
| DOI: | 10.1016/j.chemosphere.2019.125664 |
| ISSN/ISBN: | 1879-1298 (Electronic) 0045-6535 (Linking) |
| Abstract: | "Most of the volatile organic compounds (VOCs) are toxic and harmful to human health and environment. In this study, hydrochars activated with CO(2) were applied to remove VOCs. Two typical VOCs, acetone and cyclohexane, were used as the 'model' adsorbates to evaluate hydrochars' performance. Specific surface areas of pristine hydrochars were small (<8 m(2)/g), whereas activated hydrochars showed much higher values (up to 1308 m(2)/g). As a result, the adsorption of VOCs onto the pristine hydrochars (13.24-24.64 mg/g) was lower than that of the activated ones (39.42-121.74 mg/g). The adsorption of the two VOCs onto the hydrochars was exothermal. In addition, there were significant correlations (R(2) > 0.91) between the VOC removal and hydrochars' specific surface area. These results suggest that the governing mechanism was mainly physical adsorption. Increasing experimental temperature (80-139 degrees C) desorbed the VOCs from the hydrochars. Due to its higher boiling point, cyclohexane desorption required a higher temperature than acetone desorption. The reusability of the activated hydrochars to the two VOCs was confirmed by five continuous adsorption-desorption cycles. The overall results indicated that hydrochars, particularly after CO(2) activation, are sufficient for VOC abatement" |
| Keywords: | Acetone/*chemistry Adsorption Carbon/*chemistry Carbon Dioxide/*chemistry Charcoal/chemistry Cyclohexanes/*chemistry Environmental Restoration and Remediation/methods Surface Properties Temperature Volatile Organic Compounds/chemistry/*isolation & purific; |
| Notes: | "MedlineZhang, Xueyang Xiang, Wei Wang, Bing Fang, June Zou, Weixin He, Feng Li, Yuncong Tsang, Daniel C W Ok, Yong Sik Gao, Bin eng England 2019/12/27 Chemosphere. 2020 Apr; 245:125664. doi: 10.1016/j.chemosphere.2019.125664. Epub 2019 Dec 18" |
