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Acetone adsorption capacity of sulfur-doped microporous activated carbons prepared from polythiophene

Author:
Zhu, Junchao, Chen, Ruofei, Zeng, Zheng, Su, Changqing, Zhou, Ke, Mo, Yamian, Guo, Yang, Zhou, Fan, Gao, Jie, Li, Liqing
Source:
Environmental science and pollution research international 2019 v.26 no.16 pp. 16166-16180
ISSN:
0944-1344
Subject:
acetone, activated carbon, activation energy, adsorption, desorption, energy, models, moieties, molecular dynamics, oxidation, porous media, sorption isotherms, sulfonic acid, sulfur, surface area, temperature
Abstract:
Sulfur-doped activated carbons (SACs) with high sulfur content and large specific surface area were synthesized from polythiophene for acetone removal. The sulfur content of carbons (3.10–8.43 at.%) could be tunable by adjusting the activation temperature. The BET surface area and pore volume of the obtained samples were 916–2020 m² g⁻¹ and 0.678–1.100 cm³ g⁻¹, with a significant proportion of microporosity (up to 84% and 72% for BET surface area and pore volume, respectively). The resulting SACs show a superior acetone adsorption capacity (i.e., 716.4 mg g⁻¹ at 15 °C and 705 mg g⁻¹ at 25 °C for SAC700). In terms of the adsorption behavior of acetone on the activated carbons, compared to the Langmuir model, the Langmuir-Freundlich model showed better agreement with the adsorption amount. The results reveal that the surface area and micropore volume are the key factors for acetone adsorption, while the sulfur-doped functional groups, especially oxidized sulfur functional groups, can enhance the acetone adsorption capacity at a certain low pressure. Temperature programmed desorption (TPD) experiments were performed to get desorption activation energy of acetone on SAC samples, and the results ranged from 23.54 to 38.71 kJ mol⁻¹. The results of the molecular simulation show that the introduction of sulfur element can increase the binding energy between acetone molecule and carbon surface, and the tri-oxidized sulfur (sulfonic acid) functional group has the highest binding energy of − 0.4765 eV. Graphical abstract
Agid:
6452825