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Removal of Hg2+ ions by adsorption using (TiO2@MnO2)-NPs nanocomposite
Ist Teil von
Journal of material cycles and waste management, 2023-09, Vol.25 (5), p.2691-2705
Ort / Verlag
Tokyo: Springer Japan
Erscheinungsjahr
2023
Link zum Volltext
Quelle
Alma/SFX Local Collection
Beschreibungen/Notizen
Waste water contaminated with inorganic mercury is considered a serious environmental problem, mainly due to the hazardous effects this contaminant causes on human health. Thus, the present work aims to evaluate the potentiality of the bimetallic nanoadsorbent ((TiO
2
@MnO
2
)-NPs) obtained from the biosynthesis in the mercury ions (Hg
2+
) removal by adsorption. (TiO
2
@MnO
2
)-NPs was synthesized from
Aloe vera
and
Matricaria recutita
extracts. The nanoadsorbent was characterized by XRD, ZP, and pH
ZCP
. The results confirmed the production of a nanoadsorbent with an average particle diameter around 25 nm. (TiO
2
@MnO
2
)-NPs showed negative surface charge (− 11.32 mV), and pH
ZCP
≈ 7.65. Regarding Hg
2+
adsorption, the removal was 86.15%. Adsorption data were fitted by Khan (
R
2
0.96,
q
e
= 28.07 mg g
−1
) and intraparticle diffusion (
R
2
0.97,
q
t
= 28.84 mg g
−1
) models. Thermodynamics suggested the adsorption is exothermic process (Δ
H
= − 73.93 kJ mol
−1
), with decrease of the randomness (Δ
S
= 0.24 kJ mol
−1
K
−1
) in the solid–liquid interface, being favorable under temperature below 298.15 K (Δ
G
= − 1.16 kJ mol
−1
). (TiO
2
@MnO
2
)-NPs resulted in more than 80% Hg
2+
removal after six cycles of adsorption. Therefore, nanoparticles containing titanium and manganese can be effectively used for the adsorption of Hg
2+
ions, collaborating with the environment.