Thermally modified molybdenum oxide as a potential sorbent for the removal of metal cations from aqueous solutions

Kapnisti, Maria; Noli, F.; Arvanitidis, J.; Hatzidimitriou, A.

doi:10.1007/s10967-015-4190-6

Cited by 6 publications

(3 citation statements)

References 55 publications

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“…Moreover, some new Raman peaks of PbMoO 4 were observed (Figure S4). Among the 13 Raman active modes of scheelite-type PbMoO 4 (Γ = 3 A g + 5 B g + 5 E g ), 10 modes were observed in the Raman spectrum of the PbMoO 4 crystal, attributing to the combination of A g and B g modes at 318 cm –1 , and the measuring frequency was higher than that of the E g mode (∼100 cm –1 ). , Therefore, similar to the XRD, the new peaks of the Raman spectrum are attributed to the formation of PbMoO 4 after the adsorption of Pb 2+ with the MoO 2 @NHCS electrode. XPS was used to explore the adsorption/desorption mechanism.…”

Section: Resultsmentioning

confidence: 69%

High Capacitive Removal of Pb²⁺ from Wastewater and Mechanism Study over MoO₂@N-Doped Hollow Carbon Sphere Anodes

Luo

et al. 2023

ACS EST Water

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Lead pollution in the water has become a serious environmental problem with the development of metallurgy, chemical manufacturing, and mining, especially battery industries. Highly efficient removal of Pb2+ is a big challenge to wastewater treatment. In this work, highly efficient removal of Pb2+ from wastewater over MoO2@N-doped hollow carbon sphere (MoO2@NHCS) anodes was developed by a capacitive deionization (CDI) process. The adsorption capacity of Pb2+ is as high as 202.14 mg/g in a 50 ppm Pb2+ solution (pH = 6 and U = 1.2 V). In addition, MoO2@NHCS electrodes show high selectivity toward Pb2+ under competition from Na+ and other heavy metal ions. Meanwhile, the MoO2@NHCS electrodes maintain an excellent recycling ability after 20 cycles for a unique hollow structure. Moreover, the density functional theory calculations show that MoO2 crystals adsorb Pb2+ in a tetrahedral mode with the highest adsorption energy (E ads = −1.61 eV). The selective removal of Pb2+ is attributed to the octahedral MoO2 transformed into tetrahedral [MoO4]2– and then could trap the Pb2+ to form PbMoO4. Hence, this work provides an innovative thinking for the effective removal of Pb2+ from wastewater.

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Section: Resultsmentioning

confidence: 69%

High Capacitive Removal of Pb²⁺ from Wastewater and Mechanism Study over MoO₂@N-Doped Hollow Carbon Sphere Anodes

Luo

et al. 2023

ACS EST Water

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“…Moreover, a new Raman peak of PbMoO 4 was observed from the Raman spectrum. Out of 13 Raman modes of the scheelite structure: Γ = 3Ag + 5Bg + 5Eg, 11 modes of the PbMoO 4 single crystal existed in the Raman spectrum, belonging to the modes of Ag and Bg at 318 cm –1 and the modes of Eg (∼60 cm –1 ). The capture of Pb 2+ with the MoO 2 /C electrode led to the emergence of additional Raman peaks.…”

Section: Resultsmentioning

confidence: 99%

Selective Capacitive Removal of Pb²⁺ from Wastewater over Redox-Active Electrodes

Mao

Yan

Chen

et al. 2020

Environ. Sci. Technol.

111

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Water pollution has become an environmental hazard. Diverse metal cations exist in wastewater; lead is the most common heavy metal pollutant among them. Selective removal of highly toxic and ultradiluted lead ions from wastewater is a major challenge for water purification. Here, selective capacitive removal (SCR) of lead ions from wastewater over redox-active molybdenum dioxide/carbon (MoO2/C) electrodes was developed by an environment-friendly asymmetric capacitive deionization (CDI) method. The MoO2/C spheres act as cathodes of an asymmetric CDI device and effectively reduce the concentration of Pb2+ from 50 ppm to <0.21 ppb. Moreover, the SCR efficiency of lead ions over redox-active MoO2/C electrodes is >99% in mixtures of 100 ppm Pb(NO3)2 and 100 ppm NaCl solutions. In addition, the electrodes exhibit high regeneration performance in mixtures of NaCl and Pb(NO3)2 and high SCR efficiency for lead ions from mixtures of heavy metal ions. The tetrahedral structure of the [MoO4] lattice is shown to be more favorable for the intercalation of lead ions. In situ Raman spectroscopy further shows that the transition of the crystal interface between [MoO6] and [MoO4] cluster lattice could be electrochemically controlled during SCR. Therefore, this study provides a new direction for the SCR of lead ions from wastewater.

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“…Conventional heating or microwave heating will strongly affect the physical and chemical properties of a material (Ahmed, 2016). Consequently, numerous researches have applied this simple technique to modify adsorbent to increase the uptake of sorbate via chemisorption, physisorption, ion exchange, complexation or physico-chemisorption interactions (Smiljanić et al, 2010;Kapnisti et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

Adsorption kinetics and isotherm of methylene blue by thermally treated alum-based water treatment plant sludge

Yusuff

2017

Int. j. adv. appl. sci.

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This paper describes the sorption kinetic and isotherm of methylene blue (MB) by thermally treated alum sludge (TAS) at the laboratory scale. Kinetics study was conducted by varying initial concentrations of MB (50, 150 and 250 mg/L) and contact time (30, 60, 120 and 180 min) whereas adsorption isotherm was investigated at various initial concentrations (10, 50, 100, 200, 300 and 400 mg/L) at constant temperature (25 o C), contact time and agitation speed. Lagergren, Ho and Mckay and intra-particle diffusion kinetics modes were applied to the experimental data while the adsorption isotherms are described by Langmuir and Freundlich and Temkin isotherm models. The results showed that sorption kinetics and isotherm of MB were best described by Ho and Mckay kinetics model and Langmuir isotherm model, respectively. The maximum adsorption capacity (qm) obtained from Langmuir plot was 25.445 mg/g. It can be concluded the adsorption of MB by TAS is monolayer adsorption.

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Thermally modified molybdenum oxide as a potential sorbent for the removal of metal cations from aqueous solutions

Cited by 6 publications

References 55 publications

High Capacitive Removal of Pb²⁺ from Wastewater and Mechanism Study over MoO₂@N-Doped Hollow Carbon Sphere Anodes

High Capacitive Removal of Pb²⁺ from Wastewater and Mechanism Study over MoO₂@N-Doped Hollow Carbon Sphere Anodes

Selective Capacitive Removal of Pb²⁺ from Wastewater over Redox-Active Electrodes

Adsorption kinetics and isotherm of methylene blue by thermally treated alum-based water treatment plant sludge

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Thermally modified molybdenum oxide as a potential sorbent for the removal of metal cations from aqueous solutions

Cited by 6 publications

References 55 publications

High Capacitive Removal of Pb2+ from Wastewater and Mechanism Study over MoO2@N-Doped Hollow Carbon Sphere Anodes

High Capacitive Removal of Pb2+ from Wastewater and Mechanism Study over MoO2@N-Doped Hollow Carbon Sphere Anodes

Selective Capacitive Removal of Pb2+ from Wastewater over Redox-Active Electrodes

Adsorption kinetics and isotherm of methylene blue by thermally treated alum-based water treatment plant sludge

Contact Info

Product

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High Capacitive Removal of Pb²⁺ from Wastewater and Mechanism Study over MoO₂@N-Doped Hollow Carbon Sphere Anodes

High Capacitive Removal of Pb²⁺ from Wastewater and Mechanism Study over MoO₂@N-Doped Hollow Carbon Sphere Anodes

Selective Capacitive Removal of Pb²⁺ from Wastewater over Redox-Active Electrodes