Ultrasound-assisted magnetic solid phase extraction of lead and thallium in complex environmental samples using magnetic multi-walled carbon nanotubes/zeolite nanocomposite

Aphiwe Siyasanga Gugushe, Anele Mpupa, Philiswa N. Nomngongo

Research output: Contribution to journalArticlepeer-review

58 Citations (Scopus)

Abstract

Magnetic multi-walled carbon nanotubes@zeolite (MWCNT-Fe3O4@Zeo)nanocomposite was facilely synthesized using a one-pot solvothermal method. The MWCNT-Fe3O4@Zeo was characterized by VSM, BET, XRD, TEM and SEM/EDS. The Zeolite-coated multi-walled carbon nanotubes–magnetite was used as an adsorbent in ultrasonic-assisted magnetic solid phase extraction (UA-MSPE)for preconcentration of trace Pb and Tl. The analytes were detected and quantified using inductively coupled plasma optical emission spectrometry (ICP-OES). The optimization of experimental parameters affecting the preconcentration method was achieved using a multivariate approach. Under optimal experimental conditions, the linearity ranged from 0.1 to 500 μg L−1 for lead and 0.1–600 μg L−1 for thallium. Preconcentration factors, limits of detection and quantification for Pb and Tl ranged from 90 to 100, 0.28–0.23 μg L−1, 0.93–0.77 μg L−1. The intraday precisions (repeatability, n = 20)expressed as the relative standard deviation, were found to be 1.6% and 1.4% for Pb and Tl, respectively. In addition, the interday precisions (reproducibility, n = 5)were 2.6% and 3.1% for Pb and Tl, respectively. The accuracy of the method was investigated using standard reference material as well as spiked recovery test and satisfactory recoveries (97–99.3%)were obtained. The maximum adsorption capacities were 37.8 mg g−1 and 44.5 mg g−1, for Pb and Tl, respectively. The developed UA-MSPE/ICP-OES method was effectively applied for simultaneous preconcentration and determination of Pb and Tl in environmental samples.

Original languageEnglish
Article number103960
JournalMicrochemical Journal
Volume149
DOIs
Publication statusPublished - Sept 2019

Keywords

  • Environmental samples
  • Lead
  • Magnetic solid phase extraction
  • Response surface methodology
  • Thallium

ASJC Scopus subject areas

  • Analytical Chemistry
  • Spectroscopy

Fingerprint

Dive into the research topics of 'Ultrasound-assisted magnetic solid phase extraction of lead and thallium in complex environmental samples using magnetic multi-walled carbon nanotubes/zeolite nanocomposite'. Together they form a unique fingerprint.

Cite this