Carbon Nanotube Filters for Removal of Air Pollutants from Mobile Sources

Abstract

The aim of this work was the assessment of the removal of air pollutants from mobile sources by commercial carbon nanotubes (CNTs). For this, the nanomaterial was characterized by different techniques: SEM, EDS, TEM, XRD, BET, and Raman. Subsequently, the CNTs were packed in a stainless steel filters which was designed from different prototypes that were developed during the investigation. Tests were performed in the TO-913 Verificenter Macrover Auto SAQ. Inc. de CV. The results revealed that particle type sand CNTs loading had greater effects on the efficiencies than the membrane type sand pore sizes tested. When collecting NO x , the efficiencies were observed relatively lower, below 20% for loadings of 0.3 -1.5 mg/cm 2 . The studied CNTs were multi-walled: two layers, show a nonlinear growth and morphology varied since they are of different diameters and longitudes, it was observed that half of the nanotubes were coated with amorphous carbon. The composition is mainly carbon and oxygen, iron is also present. The adsorption capacity of CNTs was significantly influenced by the different aspects, like model, brand, fuel, year and the conditions of each car. The removal efficiencies of CNTs filters were shown to range from 10% to 95% in average for the CNTs loadings of 0.2 -1.6 mg/cm 2 . When collecting CO, CO 2 , NO x , HC, the efficiencies were shown to range from 5% to 60% given similar CNTs loadings used.

The Ecogeographical Impact of Air Pollution in the Azerbaijan Cities: Possible Plant/Synthetic‐Based Nanomaterial Solutions

“…Also, nanosilver and nano copper-based filters have been used to remove bioaerosols as interior air pollutants [100]. Romero-Guzmán et al have developed CNTs-based filters that collect CO, CO2, NOx, and HC with an efficiency of up to 60% [101]. Also, ultrafine dust and acid polar gas species such as SO2, NOx, and H2S were filtered with a multifunctional, metal-organic framework (MOF: UiO-66-NH2) and CNT-modified filter.…”

Highly Selective Detection of Hydrogen Sulfide by Simple Cu-CNTs Nanocomposites

“…Being efficient adsorbents, carbon nanotubes (CNTs) are used for detecting pollutants with the aim of their consequent removal from air. Different types of CNTs have been synthesized and applied for this purpose [7][8][9][10].…”