期刊
CHEMICAL ENGINEERING JOURNAL
卷 334, 期 -, 页码 191-197出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2017.08.091
关键词
Toluene adsorption; Hydrophobic; Selectivity; Phenyl functionalized; KIT-6
资金
- Public Projects Foundation of China Ministry of Environmental Protection [201509021, 201509012]
- National High-Tech Research and the Development (863) Program of China [2015AA034603]
Phenyl functionalized KIT-6 materials were prepared by co-condensation one-step method. The phenyl modified sample preserved similar toluene adsorption capacity compared with pure KIT-6 at dry conditions. At high humidity environments, the sample exhibited higher toluene adsorption capacity and better selectivity. The value of Q(wet)/Q(dry) for the (1:6) KIT-6 (PTES/TEOS = 1:6) was nearly five times higher than that of pure KIT-6 (77.8% vs. 16.1%). Their excellent hydrophobic properties were due to the conjugated pi-electrons effect between aromatic rings of phenyl groups and toluene molecules within the mesoporous channels. With increasing the percentage of PTES, the roll-up phenomena arising from the competitive adsorption of water and toluene were mitigated. Furthermore, we have calculated the rate constant using Yoon-Nelson model at dry conditions, and obtained the Henry constant from toluene or water adsorption isotherms. The results demonstrated that the phenyl modified KIT-6 had a better capture ability for toluene than the pure sample.
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