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

Research output: Contribution to journalArticlepeer-review

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 languageEnglish (US)
Pages (from-to)297-308
Number of pages12
JournalWater Science and Technology
Volume83
Issue number2
DOIs
StatePublished - Jan 15 2021

All Science Journal Classification (ASJC) codes

  • Water Science and Technology
  • Environmental Engineering

Keywords

  • Adsorption
  • Hexavalent molybdenum
  • Nanoscale zero valent iron
  • Reduction
  • Sulfidation

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