TY - JOUR
T1 - Cu(II) adsorption on 2-thiouracil-modified Luffa cylindrica biochar fibres from artificial and real samples, and competition reactions with U(VI)
AU - Liatsou, Ioanna
AU - Pashalidis, Ioannis
AU - Dosche, Carsten
N1 - Funding Information:
The XPS facility is partly fundedby the German Science Society (DFG, INST 184/144-1 FUGG).
Publisher Copyright:
© 2019 Elsevier B.V.
PY - 2020/2/5
Y1 - 2020/2/5
N2 - The adsorption of Cu(II) ions by biochar fibres prior and after modification with 2-thiouracil on real and artificial samples has been studied by batch-type adsorption experiments, FTIR and XPS spectroscopy and competition reactions using U(VI) ions as competitor cations. The experimental data of the artificial samples clearly show that the modified material presents extraordinary higher affinity for Cu(II) ions even in the acidic pH range, the spectroscopic data indicate the formation of inner-sphere complexes and the competition reactions significantly higher selectivity of the 2-thiouracil modified biochar fibres for Cu(II). The 2-thiouracil-modified biochar fibres have been successfully applied to acid mine drainage (AMD) samples regarding the selective separation of Cu(II) ions from “real” samples. Regarding the desorption of copper from the biochar surface, although 100% copper recovery was achieved by eluting the metal ion using 1 M HNO3, the deterioration of the modified biochar fibers due to extensive 2-thiouracil release from the biochar surface limits the applicability of the present adsorbent in routine and large-scale applications.
AB - The adsorption of Cu(II) ions by biochar fibres prior and after modification with 2-thiouracil on real and artificial samples has been studied by batch-type adsorption experiments, FTIR and XPS spectroscopy and competition reactions using U(VI) ions as competitor cations. The experimental data of the artificial samples clearly show that the modified material presents extraordinary higher affinity for Cu(II) ions even in the acidic pH range, the spectroscopic data indicate the formation of inner-sphere complexes and the competition reactions significantly higher selectivity of the 2-thiouracil modified biochar fibres for Cu(II). The 2-thiouracil-modified biochar fibres have been successfully applied to acid mine drainage (AMD) samples regarding the selective separation of Cu(II) ions from “real” samples. Regarding the desorption of copper from the biochar surface, although 100% copper recovery was achieved by eluting the metal ion using 1 M HNO3, the deterioration of the modified biochar fibers due to extensive 2-thiouracil release from the biochar surface limits the applicability of the present adsorbent in routine and large-scale applications.
KW - 2-thiouracil-modified biochar fibres
KW - Competition reactions
KW - Copper(II)
KW - Drainage samples
KW - Uranium(VI)
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U2 - 10.1016/j.jhazmat.2019.120950
DO - 10.1016/j.jhazmat.2019.120950
M3 - Article
C2 - 31541960
AN - SCOPUS:85072241503
SN - 0304-3894
VL - 383
JO - Journal of Hazardous Materials
JF - Journal of Hazardous Materials
M1 - 120950
ER -