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Effect of Fe loading quantity on reduction reactivity of nano zero-valent iron supported on chelating resin

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Abstract

In this study, nanoscale zero-valent iron (NZVI) were immobilized within a chelating resin (DOW 3N). To investigate the effect of Fe loading on NZVI reactivity, three NZVI-resin composites with different Fe loading were obtained by preparing Fe(III) solution in 0, 30 and 70% (v/v) ethanol aqueous, respectively; the bromate was used as a model contaminant. TEM reveals that increasing the Fe loading resulted in much larger size and poor dispersion of nanoscale iron particles. The results indicated that the removal efficiency of bromate and the rate constant (K obs) were decreased with increasing the Fe loading. For the NZVI-resin composite with lower Fe loading, the removal efficiency of bromate declined more significantly with the increase of DO concentrations. Under acidic conditions, decreasing the pH value had the most significant influence on NZVIR3 with highest Fe loading for bromate removal; however, under alkaline conditions, the most significant influence of pH was on NZVI-R1 with lowest Fe loading. The effects of co-existing anions NO –3 , PO 3–4 and HCO –3 were also investigated. All of the co-existing anions showed the inhibition to bromate reduction.

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Authors and Affiliations

  1. State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing, 210023, China

    Jialu Shi, Shengnan Yi, Chao Long & Aimin Li

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  1. Jialu Shi
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  2. Shengnan Yi
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  3. Chao Long
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  4. Aimin Li
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Correspondence to Chao Long.

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Shi, J., Yi, S., Long, C. et al. Effect of Fe loading quantity on reduction reactivity of nano zero-valent iron supported on chelating resin. Front. Environ. Sci. Eng. 9, 840–849 (2015). https://doi.org/10.1007/s11783-015-0781-2

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  • DOI: https://doi.org/10.1007/s11783-015-0781-2

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