Effect of pH, temperature and co-existing anions on the Removal of Cr(VI) in groundwater by green synthesized nZVI/Ni

Zhu, Fang; He, Siying; Liu, Tao

doi:10.1016/j.ecoenv.2018.07.082

Cited by 84 publications

(11 citation statements)

References 30 publications

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“…Positive values of ΔH and ΔS revealed that this process was endothermic and the randomness degree of system increased. Similar results of adsorption/reduction thermodynamic process of Cr(VI) by nZVI have been reported by other researchers 54 , 55 .…”

Section: Resultssupporting

confidence: 90%

Removal of hexavalent chromium from wastewater by Cu/Fe bimetallic nanoparticles

Wang

et al. 2021

Sci Rep

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Passivation of nanoscale zerovalent iron hinders its efficiency in water treatment, and loading another catalytic metal has been found to improve the efficiency significantly. In this study, Cu/Fe bimetallic nanoparticles were prepared by liquid-phase chemical reduction for removal of hexavalent chromium (Cr(VI)) from wastewater. Synthesized bimetallic nanoparticles were characterized by transmission electron microscopy, Brunauer–Emmet–Teller isotherm, and X-ray diffraction. The results showed that Cu loading can significantly enhance the removal efficiency of Cr(VI) by 29.3% to 84.0%, and the optimal Cu loading rate was 3% (wt%). The removal efficiency decreased with increasing initial pH and Cr(VI) concentration. The removal of Cr(VI) was better fitted by pseudo-second-order model than pseudo-first-order model. Thermodynamic analysis revealed that the Cr(VI) removal was spontaneous and endothermic, and the increase of reaction temperature facilitated the process. X-ray photoelectron spectroscopy (XPS) analysis indicated that Cr(VI) was completely reduced to Cr(III) and precipitated on the particle surface as hydroxylated Cr(OH)3 and CrxFe1−x(OH)3 coprecipitation. Our work could be beneficial for the application of iron-based nanomaterials in remediation of wastewater.

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Section: Resultssupporting

confidence: 90%

Removal of hexavalent chromium from wastewater by Cu/Fe bimetallic nanoparticles

Wang

et al. 2021

Sci Rep

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“…Zhu et al. [10] explored nanoscale zerovalent iron/nickel (GT-nZVI/Ni) prepared by green synthesis technology using green tea extracts and it was applied for uptake of Cr(VI) from groundwater. Biochar-supported nano zero-valent iron/nickel bimetallic composite (BC@nZVI/Ni) was synthesized using liquid phase reduction method and used to activate persulfate (PS) to degrade norfloxacin (NOR) in water [11] .…”

Section: Methods Detailsmentioning

confidence: 99%

Bottom-up approach synthesis of core-shell nanoscale zerovalent iron (CS-nZVI): Physicochemical and spectroscopic characterization with Cu(II) ions adsorption application

et al. 2020

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“…Another drawback of nZVI is the formation of iron oxide layers on the surface which decreases its reactivity [18]. It was found that deposition of a second metal such as copper [19], nickel [20] and palladium [21] on the surface can enhance the generation of electrons available to reduce pollutants and increase the activity.…”

Section: F Shao Et Al / Desalination and Water Treatment 158 (2019)mentioning

confidence: 99%

Detoxification of Cr(VI) using biochar-supported Cu/Fe bimetallic nanoparticles

Shao¹,

ShaoYu²,

Xu³

et al. 2019

Desalination and Water Treatment

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Nanoscale zero-valent iron (nZVI) has been proven to be more effective for the treatment of hexavalent chromium(Cr(VI)) when modified with the transition metal Cu. In this study, biochar-supported Cu/Fe bimetallic nanoparticles (Cu-nZVI/BC) were prepared and used for Cr(VI) removal from aqueous solution. The effects of the pH value, the initial concentration of Cr(VI), coexisting ions and humic acids (HA) were investigated. The compositional structures of Cu-nZVI/BC were analyzed by transmission electron microscopy, scanning electron microscopy, X-ray diffraction and X-ray photoelectron spectroscopy. The maximum removal efficiency of Cr(VI) was 50.57% (126.41 ± 3.75 mg g-1) for Cu-nZVI/BC at pH 2. The adsorption kinetic data were in agreement with the pseudo-second-order model, which confirmed that the adsorption step was a chemical adsorption and reduction process. The presence of Ca 2+ and NO 3 had an inhibitory effect on Cr(VI) removal, while dHA increased the removal efficiency at high concentrations. This study proves that Cu-nZVI/BC removal of solution Cr(VI) is feasible and shows significant potential in practical applications.

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Effect of pH, temperature and co-existing anions on the Removal of Cr(VI) in groundwater by green synthesized nZVI/Ni

Cited by 84 publications

References 30 publications

Removal of hexavalent chromium from wastewater by Cu/Fe bimetallic nanoparticles

Removal of hexavalent chromium from wastewater by Cu/Fe bimetallic nanoparticles

Bottom-up approach synthesis of core-shell nanoscale zerovalent iron (CS-nZVI): Physicochemical and spectroscopic characterization with Cu(II) ions adsorption application

Detoxification of Cr(VI) using biochar-supported Cu/Fe bimetallic nanoparticles

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