A rapid removal of xylene from air based on nano-activated carbon in the dynamic and static systems and compared to commercial activated carbon before determination by gas chromatography

As main air pollutants, volatile organic compounds (VOCs) must be paid special attention. In this study, the removal efficiency of xylene from the air was investigated by nano-activated carbons (NACs) as an efficient adsorbent and compared to commercial activated carbons (ACs). In the chamber, the xylene vapor in pure air was generated, stored in the airbag (۵ Li), and moved to adsorbents. Then, the xylene vapor was absorbed on the NAC/AC adsorbents and desorbed from it by a heat accessory. The efficiency of xylene removal with NACs and ACs was investigated in the dynamic and static systems based on ۱۰۰-۷۰۰ mg L-۱ of xylene, flow rates of ۱۰۰ ml min-۱, and ۱۰۰ mg of adsorbent at a humidity of ۳۲% (۲۵°C). Xylene concentrations were determined by gas chromatography equipped with a flame ionization detector (GC-FID).  In the batch system, the maximum absorption capacity for NACs and ACs was obtained at ۲۰۵.۲ mg g-۱ and ۱۱۶.۸ mg g-۱, respectively. The mean adsorption efficiency for NACs and ACs adsorbents was obtained at ۹۸.۵% and ۷۶.۵۵%, respectively. The RSD% for NACs ranged between ۱.۱-۲.۵% in optimized conditions. The characterizations of the NACs adsorbent showed that the particle-size range was between ۳۵-۱۰۰ nm.

کلیدواژه ها:

Xylene ، Adsorption ، Air ، Nano activated carbon ، Dynamic system ، Gas Chromatography