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Abstract
In the present work, three metal (oxyhydr)oxides, i.e. 2-line ferrihydrite (FeOOH), bayerite (β-Al(OH)3), and hausmannite (Mn3O4), were prepared and then employed as adsorbents for As(V) in aqueous solution. Both adsorption equilibrium and kinetics of As(V) have been investigated via batch experiments. The adsorption equilibrium results indicated that all adsorption data follow the Langmuir equation with maximum adsorption capacities of 28.57, 14.29, and 1.00 mg g−1 for FeOOH, β-Al(OH)3, and Mn3O4, respectively. It was found that the pseudo-second-order kinetic equation is capable of fitting these kinetic data well with correlation coefficients (R2) greater than 0.98. The effects of co-occurring anions, both phosphate () and sulfate (
), were shown to reduce As(V) uptake, whereas calcium ion (Ca2+) was found to enhance As(V) adsorption. This work can extend our understanding of equilibrium and kinetic behaviors of As(V) adsorption on typical metal (oxyhydr)oxides.
Acknowledgments
The work was financially supported by NSFC (grant numbers. 51002080, 5130105009), CSC (grant number 2011832032), the Priority Academic Program Development of Jiangsu Higher Education Institutions and Collaborative Innovation Center of Atmospheric Environment and Equipment Technology. Jing Wang and Dongyang Nie are grateful for their experimental assistance.