| Title: | Adsorption/desorption characteristics of low-concentration semi-volatile organic compounds in vapor phase on activated carbon |
| Author(s): | Ma X; Yang L; Hou Y; Zhou L; |
| Address: | "Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing, 210096, China. Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing, 210096, China. Electronic address: ylj@seu.edu.cn. National-Local Joint Engineering Research Center of Heavy Metals Pollutants Control and Resource Utilization, Nanchang Hangkong University, Nanchang, 330063, China" |
| DOI: | 10.1016/j.jenvman.2021.114360 |
| ISSN/ISBN: | 1095-8630 (Electronic) 0301-4797 (Linking) |
| Abstract: | "The adsorption/desorption behaviors of semi-volatile organic compounds (SVOCs: 1,2,3,4-tetrachlorobenzene (TCB) and phenol) in vapor phase by activated carbon (AC) were investigated by the experiments and density functional theory calculation. Investigations showed that at 100-160 degrees C, the adsorption capacities of TCB and phenol on AC were in the range of 176.6-342.0 mg/g and 24.0-66.4 mg/g, respectively. Increasing the temperature inhibited the SVOCs adsorption. TCB tended to be adsorbed on AC surface by monolayer, whereas the phenol was multilayer adsorption. The stronger interaction between SVOCs and active sites resulted in a higher desorption temperature (TCB: 255-689 degrees C; phenol: 200-369 degrees C). The SVOCs adsorption on AC was fitted well by the pseudo-first-order kinetic model, their lower concentration and larger molecular structure influenced the AC external mass transfer and intraparticle diffusion. TCB and phenol were adsorbed on graphite layer by a parallel manner, their highest adsorption energies were -75.59 kJ/mol and -55.00 kJ/mol, respectively. Oxygen-containing groups altered the charge distribution of the atoms at the edge of the graphite layer, which improved the SVOCs adsorption through enhancement of electrostatic interactions and formation of hydrogen bonds. The carboxyl and lactone groups played a critical role in improving the TCB adsorption capacity, while the carboxyl was important for phenol adsorption" |
| Keywords: | Adsorption *Charcoal Kinetics Phenol Phenols *Volatile Organic Compounds Adsorption kinetics Adsorption/desorption Density functional theory Mechanism Semi-volatile organic compounds; |
| Notes: | "MedlineMa, Xiuwei Yang, Linjun Hou, Yong Zhou, Lei eng England 2021/12/27 J Environ Manage. 2022 Mar 1; 305:114360. doi: 10.1016/j.jenvman.2021.114360. Epub 2021 Dec 24" |
