title: Single-Walled Carbon Nanotubes (SWCNTs), as a Novel Sorbent for Determination of Mercury in Air.
abstract: BACKGROUND
  Based on the noticeable toxicity and numerous application of mercury in industries, removal of mercury vapor through sorbent is an important environmental challenge.
  
  
  OBJECTIVE
  Due to their highly porous and hollow structure, large specific surface area, light mass density and strong interaction, Single-Walled Carbon Nanotubes (SWCNTs) sorbent were selected for this investigation.
  
  
  METHODS
  In this study, instrumental conditions, method procedure and different effective parameters such as adsorption efficiency, desorption capacity, time, temperature and repeatability as well as retention time of adsorbed mercury were studied and optimized. Also, mercury vapor was determined by cold vapor atomic absorption spectrometry (CV-AAS).Obtained data were analyzed by Independent T- test, Multivariate linear regression and one way-ANOVA finally.
  
  
  RESULTS
  For 80 mg nanotubes, working range of SWCNT were achieved 0.02-0.7 mg with linear range (R2=0.994).Our data revealed that maximum absorption capacity was 0.5 mg g-1 as well as limit of detection (LOD) for studied sorbent was 0.006 mg. Also, optimum time and temperature were reported, 10 min and 250 °C respectively. Retention time of mercury on CNTs for three weeks was over 90%. Results of repeated trials indicated that the CNTs had long life, so that after 30 cycles of experiments, efficiency was determined without performance loss.
  
  
  CONCLUSIONS
  Results showed that carbon nanotubes have high potential for efficient extraction of mercury from air and can be used for occupational and environmental purposes. The study of adsorption properties of CNTs is recommended.
authors.affiliation: . alifaghihi60@yahoo.com.
authors.forename: Farideh
authors.initials: F
authors.lastname: Golbabaei
authors.forename: Ali
authors.initials: A
authors.lastname: Ebrahimi
authors.forename: Hamid
authors.initials: H
authors.lastname: Shirkhanloo
authors.forename: Alireza
authors.initials: A
authors.lastname: Koohpaei
authors.forename: Ali
authors.initials: A
authors.lastname: Faghihi-Zarandi
mesh_terms: D000327:Adsorption; D000393:Air Pollutants / Q000032:analysis*; D003080:Cold Temperature; D007220:Industrial Waste / Q000032:analysis*; D008628:Mercury / Q000032:analysis*; D037742:Nanotubes, Carbon / Q000737:chemistry*; D013054:Spectrophotometry, Atomic / Q000379:methods*; D014835:Volatilization
chemical_list: D000393:Air Pollutants; D007220:Industrial Waste; D037742:Nanotubes, Carbon; D008628:Mercury