TY - JOUR
T1 - Reduction and Adsorption of Hexavalent Chromium by Iron Sulfide Loaded Biochar
T2 - Isotherms, Kinetics and Thermodynamics
AU - Qhubu, Mpho Cynthia
AU - Lesaoana, Mahadi
AU - Nomngongo, Philiswa Nosizo
AU - Pakade, Vusumzi Emmanuel
N1 - Publisher Copyright:
© 2023 Wiley-VCH GmbH.
PY - 2023/8/31
Y1 - 2023/8/31
N2 - The removal of noxious Cr(VI) from water has gained worldwide attention. In this study, biochar derived from macadamia nut shells (MHP) was embedded with iron sulfide (FeS) nanoparticles produced through a solid-phase reduction of pyrite. The MHP-FeS composite was evaluated for the adsorption of Cr(VI) and its subsequent reduction to Cr(III). The scanning electron microscope images revealed that the particles were of irregular shape, while the energy dispersive spectroscopy results showed the existence of Fe, S, O, and C atoms. X-ray diffraction peaks at 2=29.8°, 33.7°, 43.7°, and 53.1° were characteristic of the formation of FeS nanoparticles. A maximum Cr(VI) adsorption capacity of 4.95 mg/g was obtained at pH 3, 60 min, and 25 °C. The higher correlation coefficient (R2>0.873) and lower residual standard error (RSE=1.43) values pointed to the adsorption process favoring Langmuir and pseudo-second-order models. As per thermodynamic reaction calculations, the remediation process was spontaneous and endothermic. With further optimization, this material could be a potential adsorbent and reductant for Cr(VI) in water.
AB - The removal of noxious Cr(VI) from water has gained worldwide attention. In this study, biochar derived from macadamia nut shells (MHP) was embedded with iron sulfide (FeS) nanoparticles produced through a solid-phase reduction of pyrite. The MHP-FeS composite was evaluated for the adsorption of Cr(VI) and its subsequent reduction to Cr(III). The scanning electron microscope images revealed that the particles were of irregular shape, while the energy dispersive spectroscopy results showed the existence of Fe, S, O, and C atoms. X-ray diffraction peaks at 2=29.8°, 33.7°, 43.7°, and 53.1° were characteristic of the formation of FeS nanoparticles. A maximum Cr(VI) adsorption capacity of 4.95 mg/g was obtained at pH 3, 60 min, and 25 °C. The higher correlation coefficient (R2>0.873) and lower residual standard error (RSE=1.43) values pointed to the adsorption process favoring Langmuir and pseudo-second-order models. As per thermodynamic reaction calculations, the remediation process was spontaneous and endothermic. With further optimization, this material could be a potential adsorbent and reductant for Cr(VI) in water.
KW - Adsorption
KW - Biochar
KW - Chromium
KW - Iron sulfide
KW - Reduction
UR - http://www.scopus.com/inward/record.url?scp=85168507516&partnerID=8YFLogxK
U2 - 10.1002/slct.202301170
DO - 10.1002/slct.202301170
M3 - Article
AN - SCOPUS:85168507516
SN - 2365-6549
VL - 8
JO - ChemistrySelect
JF - ChemistrySelect
IS - 32
M1 - e202301170
ER -