在气相色谱测定之前,以纳米活性炭为基础,在动态和静态系统中快速去除空气中的二甲苯,并与商业活性炭进行比较

M. Jafarizaveh, A. Tabrizi, F. Golbabaei
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引用次数: 0

摘要

挥发性有机物(VOCs)作为主要的大气污染物,必须引起高度重视。研究了纳米活性炭作为高效吸附剂对空气中二甲苯的去除效果,并与工业活性炭进行了比较。在腔室中,产生纯空气中的二甲苯蒸气,储存在安全气囊(5li)中,并移动到吸附剂上。然后,二甲苯蒸汽在NAC/AC吸附剂上吸附,并通过加热附件解吸。以100-700 mg L-1的二甲苯、100 ml min-1的流速、100 mg吸附剂、32%的湿度(25°C)为条件,在动态和静态系统中考察了nac和ACs对二甲苯的去除效率。采用气相色谱-火焰离子化检测器(GC-FID)测定二甲苯浓度。在批处理体系中,nac和ACs的最大吸附量分别为205.2 mg g-1和116.8 mg g-1。nac和ACs吸附剂的平均吸附效率分别为98.5%和76.55%。优化条件下,NACs的RSD%在1.1 ~ 2.5%之间。表征结果表明,NACs吸附剂的粒径范围在35 ~ 100 nm之间。
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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 (5 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 100-700 mg L-1 of xylene, flow rates of 100 ml min-1, and 100 mg of adsorbent at a humidity of 32% (25°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 205.2 mg g-1 and 116.8 mg g-1, respectively. The mean adsorption efficiency for NACs and ACs adsorbents was obtained at 98.5% and 76.55%, respectively. The RSD% for NACs ranged between 1.1-2.5% in optimized conditions. The characterizations of the NACs adsorbent showed that the particle-size range was between 35-100 nm.
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