Synthesis of Cu-BTC modified by CTAB and its adsorption and separation of xylene isomers
In this work,cetyltrimethylammonium bromide(CTAB)was added in the process of hydrothermal synthesis of Cu-BTC crystal,and the morphology and pore structure of the adsorbed material were modified by adjusting the addition amount of CTAB.Compared with the original Cu-BTC,the static adsorption capacity of the modified Cu-BTC material was significantly increased.It was higher than m-xylene(MX)and o-xylene(OX),which improved the adsorption selectivity of isomers.The static and kinetic properties of xylene isomers on Cu-BTC-CTAB adsorbent were systematically studied.A series of adsorption equilibrium experiments on xylene organic vapor were conducted at 298K,318K and 338K,and the static adsorption rate curves and adsorption isotherms were obtained.In the modified material,the adsorption capacity and selectivity of PX in Cu-BTC-CTAB sample with 0.08%CTAB were the best.Kinetic studies showed that the adsorption of xylene isomers on Cu-BTC-CTAB could be described by a pseudo-first-order kinetic model.
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维普
