Şeyda Adıgüzel Istıl, Pawel Wargocki, Tamer Güzel
Traffic-related outdoor nitrogen dioxide (NO2) emissions can infiltrate indoor environments, negatively affecting indoor air quality (IAQ), particularly in buildings near urban roads. In the present exploratory study, the passive performance of graphene oxide (GO)-doped polyacrylonitrile (PAN) electrospun nanofiber filters (GOPAN) for NO2 removal was investigated under controlled conditions representative of indoor exposure to traffic-related pollution. GOPAN nanofibers were fabricated with varying GO concentrations (0.5-3 wt%) to evaluate the effect of the GO loading on passive indoor NO2 removal performance. Chamber-scale experiments were conducted under controlled indoor environmental conditions using NO2 concentrations representative of urban outdoor exposure levels. Among all tested GOPAN nanofiber filters, the 2 wt% GO-doped filter (2GOPAN) achieved the highest passive NO2 removal efficiency of approximately 31%. The results demonstrate that the moderate incorporation of GO may improve the passive interaction of PAN-based electrospun membranes with NO2 at concentrations representative of urban outdoor exposure levels. The chamber experiment is an initial screening of materials, not a direct simulation of airflow through an open window. However, the relatively low clean air delivery rates (CADR) indicate that substantial improvements in material performance are required for practical large-scale applications and highlight the strong limitation of passive air cleaning by diffusion-controlled mass transfer under indoor conditions.