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Chromate and selenate hydrocalumite solid solutions and their applications in waste treatment

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Abstract

Hydrocalumite, a calcium aluminate hydrate phase, consists of positively-charged structure units, and is therefore an ideal candidate for accommodating anionic contaminants. In this study, a series of batch experiments was carried out to examine the uptake of chromate and selenate by hydrocalumite. To determine the uptake capacity and long-term stability, hydrocalumite solid solutions between chromate/selenate and hydroxyl were synthesized over a reaction time of more than one year. At a ratio of water to initial solids added (CaAI2O4+CaO) of 75:1, the maximum uptake capacities were over 77 and 114 g/kg for Cr and Se, respectively. These values are very close to the theoretical uptake capacities of chromate and selenate hydrocalumite end members (81 and 118 g/kg, respectively). The oxyanion removal efficiency from solution was above 95%. Due to the high uptake capacity and anion removal efficiency of hydrocalumites, their application in wastewater treatment is promising. Hydrocalumites are also important hydration products of cementitious materials, the long-term stability of these phases is of significance for application in solidification/stabilization technology.

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Authors and Affiliations

  1. Department of Earth Sciences, University of Waterloo, N2L 3G1, Waterloo, Ontario, Canada

    Zhang Min & Eric J. Reardon

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  1. Zhang Min
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  2. Eric J. Reardon
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Correspondence to Zhang Min.

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Zhang, M., Reardon, E.J. Chromate and selenate hydrocalumite solid solutions and their applications in waste treatment. Sci. China Ser. C.-Life Sci. 48 (Suppl 1), 165–173 (2005). https://doi.org/10.1007/BF02889815

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  • DOI: https://doi.org/10.1007/BF02889815

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