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Comparison of As removal efficiency and health risks from aqueous solution using as-synthesized Fe0 and Cu0: modelling, kinetics and reusability.
- Source :
- Environmental Geochemistry & Health; Dec2023, Vol. 45 Issue 12, p8989-9002, 14p
- Publication Year :
- 2023
-
Abstract
- Batch scale removal of arsenic (As) from aqueous media was explored using nano-zero valent iron (Fe<superscript>0</superscript>) and copper (Cu<superscript>0</superscript>) particles. The synthesized particles were characterized using a Brunauer-Emmett–Teller (BET) surface area analyzer, a scanning electron microscope (SEM), and Fourier transform infrared spectroscopy (FTIR). The BET result showed that the surface area (31.5 m<superscript>2</superscript>/g) and pore volume (0.0415 cm<superscript>3</superscript>/g) of synthesized Fe<superscript>0</superscript> were higher than the surface area (17.56 m<superscript>2</superscript>/g) and pore volume (0.0287 cm<superscript>3</superscript>/g) of Cu<superscript>0</superscript>. The SEM results showed that the morphology of the Fe<superscript>0</superscript> and Cu<superscript>0</superscript> was flowery microspheres and highly agglomerated with thin flakes. The FTIR spectra for Fe<superscript>0</superscript> showed broad and intense peaks as compared to Cu<superscript>0</superscript>. The effects of the adsorbent dose (1–4 g/L), initial concentration of As (2 mg/L to 10 mg/L) and solution pH (2–12) were evaluated on the removal of As. Results revealed that effective removal of As was obtained at pH 4 with Fe<superscript>0</superscript> (94.95%) and Cu<superscript>0</superscript> (74.86%). When the dosage increased from 1 to 4 g L<superscript>−1</superscript>, the As removal increased from 70.59 to 93.02% with Fe<superscript>0</superscript> and from 67 to 70.59% with Cu<superscript>0</superscript>. However, increasing the initial As concentration decreased the As removal significantly. Health risk indices, including estimated daily intake (EDI), hazard quotient (HQ), and cancer risk (CR) were employed and a significant decline (up to 99%) in risk indices was observed in As-treated water using Fe<superscript>0</superscript>/Cu<superscript>0</superscript>. Among the adsorption isotherm models, the values of R<superscript>2</superscript> showed that isothermal As adsorption by Fe<superscript>0</superscript> and Cu<superscript>0</superscript> was well explained by the Freundlich adsorption isotherm model (R<superscript>2</superscript> > 0.98) while the kinetic experimental data was well-fitted with the Pseudo second order model. The Fe<superscript>0</superscript> showed excellent stability and reusability over five sorption cycles, and it was concluded that, compared to the Cu<superscript>0</superscript>, the Fe<superscript>0</superscript> could be a promising technology for remediating As-contaminated groundwater. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 02694042
- Volume :
- 45
- Issue :
- 12
- Database :
- Complementary Index
- Journal :
- Environmental Geochemistry & Health
- Publication Type :
- Academic Journal
- Accession number :
- 173822163
- Full Text :
- https://doi.org/10.1007/s10653-023-01589-6