Enhanced molybdenum(VI) removal using sulfide-modified nanoscale zerovalent iron: Kinetics and influencing factors

J. J. Lian; M. Yang; H. L. Wang; Y. Zhong; B. Chen; W. L. Huang; P. A. Peng

doi:10.2166/wst.2020.570

Enhanced molybdenum(VI) removal using sulfide-modified nanoscale zerovalent iron: Kinetics and influencing factors

J. J. Lian, M. Yang, H. L. Wang, Y. Zhong, B. Chen, W. L. Huang, P. A. Peng

School of Environmental and Biological Sciences, Environmental Science

Research output: Contribution to journal › Article › peer-review

10 Scopus citations

Abstract

The overall goal of this study is to investigate the effect of sulfidated nanoscale zerovalent iron (S-nZVI) on the removal of hexavalent molybdate (MoO²₄^-) under different aquatic chemistry conditions. Surface analysis suggests that Mo(VI) is removed mainly by adsorption and co-precipitation onto the surface of S-nZVI and a small amount of Mo(VI) can be reduced to Mo(V) species. The results of batch tests show that Mo(VI) removal by S-nZVI are well described with the pseudo-second-order adsorption model. The removal rate increases with a decrease in solution pH (4.0-9.0) and is significantly affected by the S/Fe ratio of S-nZVI, with the optimal S/Fe ratio being 0.5. The presence of anions WO²₄^- or CrO²₄^- can reduce the Mo(VI) removal, which is likely because they compete for adsorption sites on the solid surfaces. The divalent cations Ni²⁺, Cu²⁺ and Co²⁺ also inhibit the removal of Mo(VI) whereas Zn²⁺, Ca²⁺ and Mg²⁺ enhance it. After being aged for 35 d in water, S-nZVI still exhibits high reactivity towards Mo(VI) removal (57.39%). The study demonstrates that S-nZVI can be used as an environmentally friendly material for effectively removing Mo(VI) from contaminated water.

Original language	English (US)
Pages (from-to)	297-308
Number of pages	12
Journal	Water Science and Technology
Volume	83
Issue number	2
DOIs	https://doi.org/10.2166/wst.2020.570
State	Published - Jan 15 2021

All Science Journal Classification (ASJC) codes

Environmental Engineering
Water Science and Technology

Keywords

Adsorption
Hexavalent molybdenum
Nanoscale zero valent iron
Reduction
Sulfidation

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10.2166/wst.2020.570

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title = "Enhanced molybdenum(VI) removal using sulfide-modified nanoscale zerovalent iron: Kinetics and influencing factors",

abstract = "The overall goal of this study is to investigate the effect of sulfidated nanoscale zerovalent iron (S-nZVI) on the removal of hexavalent molybdate (MoO24-) under different aquatic chemistry conditions. Surface analysis suggests that Mo(VI) is removed mainly by adsorption and co-precipitation onto the surface of S-nZVI and a small amount of Mo(VI) can be reduced to Mo(V) species. The results of batch tests show that Mo(VI) removal by S-nZVI are well described with the pseudo-second-order adsorption model. The removal rate increases with a decrease in solution pH (4.0-9.0) and is significantly affected by the S/Fe ratio of S-nZVI, with the optimal S/Fe ratio being 0.5. The presence of anions WO24- or CrO24- can reduce the Mo(VI) removal, which is likely because they compete for adsorption sites on the solid surfaces. The divalent cations Ni2+, Cu2+ and Co2+ also inhibit the removal of Mo(VI) whereas Zn2+, Ca2+ and Mg2+ enhance it. After being aged for 35 d in water, S-nZVI still exhibits high reactivity towards Mo(VI) removal (57.39%). The study demonstrates that S-nZVI can be used as an environmentally friendly material for effectively removing Mo(VI) from contaminated water.",

keywords = "Adsorption, Hexavalent molybdenum, Nanoscale zero valent iron, Reduction, Sulfidation",

author = "Lian, {J. J.} and M. Yang and Wang, {H. L.} and Y. Zhong and B. Chen and Huang, {W. L.} and Peng, {P. A.}",

note = "Publisher Copyright: {\textcopyright} IWA Publishing 2021 Water Science & Technology |",

year = "2021",

month = jan,

day = "15",

doi = "10.2166/wst.2020.570",

language = "English (US)",

volume = "83",

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T1 - Enhanced molybdenum(VI) removal using sulfide-modified nanoscale zerovalent iron

T2 - Kinetics and influencing factors

AU - Lian, J. J.

AU - Yang, M.

AU - Wang, H. L.

AU - Zhong, Y.

AU - Chen, B.

AU - Huang, W. L.

AU - Peng, P. A.

N1 - Publisher Copyright: © IWA Publishing 2021 Water Science & Technology |

PY - 2021/1/15

Y1 - 2021/1/15

N2 - The overall goal of this study is to investigate the effect of sulfidated nanoscale zerovalent iron (S-nZVI) on the removal of hexavalent molybdate (MoO24-) under different aquatic chemistry conditions. Surface analysis suggests that Mo(VI) is removed mainly by adsorption and co-precipitation onto the surface of S-nZVI and a small amount of Mo(VI) can be reduced to Mo(V) species. The results of batch tests show that Mo(VI) removal by S-nZVI are well described with the pseudo-second-order adsorption model. The removal rate increases with a decrease in solution pH (4.0-9.0) and is significantly affected by the S/Fe ratio of S-nZVI, with the optimal S/Fe ratio being 0.5. The presence of anions WO24- or CrO24- can reduce the Mo(VI) removal, which is likely because they compete for adsorption sites on the solid surfaces. The divalent cations Ni2+, Cu2+ and Co2+ also inhibit the removal of Mo(VI) whereas Zn2+, Ca2+ and Mg2+ enhance it. After being aged for 35 d in water, S-nZVI still exhibits high reactivity towards Mo(VI) removal (57.39%). The study demonstrates that S-nZVI can be used as an environmentally friendly material for effectively removing Mo(VI) from contaminated water.

AB - The overall goal of this study is to investigate the effect of sulfidated nanoscale zerovalent iron (S-nZVI) on the removal of hexavalent molybdate (MoO24-) under different aquatic chemistry conditions. Surface analysis suggests that Mo(VI) is removed mainly by adsorption and co-precipitation onto the surface of S-nZVI and a small amount of Mo(VI) can be reduced to Mo(V) species. The results of batch tests show that Mo(VI) removal by S-nZVI are well described with the pseudo-second-order adsorption model. The removal rate increases with a decrease in solution pH (4.0-9.0) and is significantly affected by the S/Fe ratio of S-nZVI, with the optimal S/Fe ratio being 0.5. The presence of anions WO24- or CrO24- can reduce the Mo(VI) removal, which is likely because they compete for adsorption sites on the solid surfaces. The divalent cations Ni2+, Cu2+ and Co2+ also inhibit the removal of Mo(VI) whereas Zn2+, Ca2+ and Mg2+ enhance it. After being aged for 35 d in water, S-nZVI still exhibits high reactivity towards Mo(VI) removal (57.39%). The study demonstrates that S-nZVI can be used as an environmentally friendly material for effectively removing Mo(VI) from contaminated water.

KW - Adsorption

KW - Hexavalent molybdenum

KW - Nanoscale zero valent iron

KW - Reduction

KW - Sulfidation

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SN - 0273-1223

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JF - Water Science and Technology

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ER -

Enhanced molybdenum(VI) removal using sulfide-modified nanoscale zerovalent iron: Kinetics and influencing factors

Abstract

All Science Journal Classification (ASJC) codes

Keywords

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