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

Jing Lian | Zendy; Mei Yang | Zendy; Hailong Wang | Zendy; Yuanhong Zhong | Zendy; B. Chen | Zendy; W. L. Huang | Zendy; Ping’an Peng | Zendy

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

Author(s) -

Jing Lian,

Mei Yang,

Hailong Wang,

Yuanhong Zhong,

B. Chen,

W. L. Huang,

Ping’an Peng

Publication year - 2020

Publication title -

water science and technology

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.406

H-Index - 137

eISSN - 1996-9732

pISSN - 0273-1223

DOI - 10.2166/wst.2020.570

Subject(s) - zerovalent iron , adsorption , chemistry , molybdate , reactivity (psychology) , hexavalent chromium , molybdenum , divalent , kinetics , inorganic chemistry , sulfide , precipitation , nuclear chemistry , water treatment , chromium , environmental engineering , organic chemistry , medicine , physics , alternative medicine , pathology , quantum mechanics , meteorology , engineering

The overall goal of this study is to investigate the effect of sulfidated nanoscale zerovalent iron (S-nZVI) on the removal of hexavalent molybdate () 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 or 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.

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