Dynamic cum batch adsorption of a vesicant CWA (2-chloroethyl ethyl sulfide) over synthetic erionite

作者：Khanday Waheed Ahmad

来源：Microporous and Mesoporous Materials, 2017, 244: 15-20.

DOI：10.1016/j.micromeso.2017.02.042

• 2-Chloroethyl ethyl sulfide
• Dynamic adsorption
• Erionite
• Thermal desorption

Erionite was synthesized under hydrothermal and static conditions and was characterized by Fourier transform infrared spectroscopy (FTIR), Scanning electron microscopy (SEM) and BET surface area measurement. The dynamic adsorption experiments were carried out on Temperature programed desorption (TPD) plus Chemisorption system (Micrometrics ASAP 2920 unit). Adsorption was found to be high initially and it then decreases with increase in injected volume. In batch reactor it was found that adsorption increases with increase in contact time between 2-chloroethyl ethyl sulfide and erionite only up to around 12 h after which it remains almost constant. It is exhibited from the data that maximum adsorption capacity of erionite for 2-chloroethyl ethyl sulfide was 70.26 mg/g at 25 degrees C. Pseudo second order kinetics was found to describe adsorption process better than pseudo first order kinetics. Freundlich and Langmuir isotherms applied on the adsorption data reveal that data fitted best for Freundlich model. Desorption pattern was analyzed which shows two types of peaks, sharp peak representing desorption of physisorbed 2-chloroethyl ethyl sulfide and a broad representing desorption of strongly chemisorbed 2-chloroethyl ethyl sulfide. Further it was observed that the adsorbent can be recycled and reused again.

• 出版日期2017-5-15