Photothermal Desorption of Toluene from Carbonaceous Substrates Using Light Flash.
Photothermal Desorption of Toluene from Carbonaceous Substrates Using Light Flash.
复制标题
DOI：
10.3390/nano12040662
复制
发表时间：
2022-02-16
期刊：
影响因子：
--
通讯作者：
Lungu CT
中科院分区：
文献类型：
--
作者：
Floyd EL;Oh J;Sapag K;Oni TM;Shedd JS;Lungu CT
每年有数百万工人的职业暴露于挥发性有机化合物（VOCs）中。目前的暴露评估技术主要利用基于吸附剂的预浓缩器来收集挥发性有机化合物，并使用化学或热解吸进行分析。化学解吸通常分析1 μ L的1 mL（0.1%）萃取量，提供有限的灵敏度。热解吸通常分析100%的样品，提供最大的灵敏度，但不允许重复分析样品，通常具有比需要的更高的灵敏度。在这项研究中，我们描述了一种新的光热解吸（PTD）技术，以弥合化学解吸和热解吸之间的灵敏度差距。我们使用PTD从三种碳质底物中部分解吸甲苯；活性炭粉（AC-p）、单壁碳纳米管（SWNT）粉（SWNT-p）和单壁碳纳米管毡（SWNT-f）。吸附剂装载435 ug甲苯蒸气并以四种光能照射。根据底物和闪光能量的不同，单次闪光的解吸范围从<0.007%到0.86%。在所有辐照能量下，与AC-p或SWNT-p相比，SWNT-f衬底的PTD明显更大，更一致。我们将SWNT-f更好的性能归因于其独特的纳米材料特性的更好利用：沿着纳米管轴的高导热性，以及与粉状形式相比，毛毡基质内更大的互连。
Millions of workers are occupationally exposed to volatile organic compounds (VOCs) annually. Current exposure assessment techniques primarily utilize sorbent based preconcentrators to collect VOCs, with analysis performed using chemical or thermal desorption. Chemical desorption typically analyzes 1 µL out of a 1 mL (0.1%) extraction volume providing limited sensitivity. Thermal desorption typically analyzes 100% of the sample which provides maximal sensitivity, but does not allow repeat analysis of the sample and often has greater sensitivity than is needed. In this study we describe a novel photothermal desorption (PTD) technique to bridge the sensitivity gap between chemical desorption and thermal desorption. We used PTD to partially desorb toluene from three carbonaceous substrates; activated carbon powder (AC-p), single-walled carbon nanotube (SWNT) powder (SWNT-p) and SWNT felts (SWNT-f). Sorbents were loaded with 435 ug toluene vapour and irradiated at four light energies. Desorption ranged from <0.007% to 0.86% with a single flash depending on substrate and flash energy. PTD was significantly greater and more consistent in SWNT-f substrates compared to AC-p or SWNT-p at all irradiation energies. We attribute the better performance of SWNT-f to greater utilization of its unique nanomaterials properties: high thermal conductivity along the nanotube axis, and greater interconnection within the felt matrix compared to the powdered form.
登录
查看更多内容
影响因子：
10.9
作者：
Li, FX;Wang, Y;Wei, F
通讯作者：
Wei, F
影响因子：
15
作者：
Georgakilas, V;Kordatos, K;Hirsch, A
通讯作者：
Hirsch, A
影响因子：
7.4
作者：
Hussain, Chaudhery Mustansar;Saridara, Chutarat;Mitra, Somenath
通讯作者：
Mitra, Somenath
影响因子：
4.1
作者：
Hussain, Chaudhery Mustansar;Saridara, Chutarat;Mitra, Somenath
通讯作者：
Mitra, Somenath
影响因子：
2.8
作者：
Cinke, M;Li, J;Meyyappan, M
通讯作者：
Meyyappan, M