Simultaneous removal of Cd(II) and Sb(V) by Fe-Mn binary oxide: Positive effects of Cd(II) on Sb(V) adsorption

Journal of Hazardous Materials
Rui-Ping LiuJiu-Hui Qu

Abstract

The coexistence of cadmium ion (Cd(II)) and antimonate (Sb(V)) creates the need for their simultaneous removal. This study aims to investigate the effects of positively-charged Cd(II) on the removal of negative Sb(V) ions by Fe-Mn binary oxide (FMBO) and associated mechanisms. The maximum Sb(V) adsorption density (Qmax,Sb(V)) increased from 1.02 to 1.32 and 2.01 mmol/g in the presence of Cd(II) at 0.25 and 0.50 mmol/L. Cd(2+) exhibited a more significant positive effect than both calcium ion (Ca(2+)) and manganese ion (Mn(2+)). Cd(2+) showed higher affinity towards FMBO and increased its ζ-potential more significantly compared to Ca(2+) and Mn(2+). The simultaneous adsorption of Sb(V) and Cd(II) onto FMBO can be achieved over a wide initial pH (pHi) range from 2 to 9, and QSb(V) decreases whereas QCd(II) increases with elevated pHi. Their combined values, as expressed by QSb(V)+Cd(II), amount to about 2 mmol/g and vary slightly in the pHi range 4-9. FTIR and XPS spectra indicate the significant synergistic effect of Cd(II) on Sb(V) adsorption onto FMBO, and that little chemical valence transformation occurs. These results may be valuable for the treatment of wastewater with coexisting heavy metals such as Cd(II) and Sb(V).

References

Aug 16, 2011·Journal of Colloid and Interface Science·Wei XuJiuhui Qu
Jul 14, 2012·Integrated Environmental Assessment and Management·James M SkeaffBarry Joyce

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Citations

Sep 29, 2017·International Journal of Environmental Research and Public Health·Xiaoming HuangMin Pan
Feb 25, 2020·Water Environment Research : a Research Publication of the Water Environment Federation·Hongbo LiuEric Lichtfouse
Oct 14, 2019·Environmental Science and Pollution Research International·Benny Marie B EnsanoDennis C Ong
Nov 18, 2020·Environmental Science and Pollution Research International·Qiu-Yi DongHe-Ping Zhao

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