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    Effect of calcium on adsorptive removal of As(III) and As(V) by iron oxide-based adsorbents

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    Type
    Article
    Authors
    Uwamariya, V.
    Petruševski, Branislav
    Lens, Piet Nl L
    Amy, Gary L.
    KAUST Department
    Biological and Environmental Sciences and Engineering (BESE) Division
    Environmental Science and Engineering Program
    Water Desalination and Reuse Research Center (WDRC)
    Date
    2014-07-11
    Online Publication Date
    2014-07-11
    Print Publication Date
    2014-12-17
    Permanent link to this record
    http://hdl.handle.net/10754/575601
    
    Metadata
    Show full item record
    Abstract
    The effects of calcium on the equilibrium adsorption capacity of As(III) and As(V) onto iron oxide-coated sand (IOCS) and granular ferric hydroxide (GFH) were investigated through batch experiments, rapid small-scale column tests (RSSCT) and kinetics modelling. Batch experiments showed that at calcium concentrations≤20 mg/L, high As(III) and As(V) removal efficiencies by IOCS and GFH are achieved at pH 6. An increase of the calcium concentration to 40 and 80 mg/L reversed this trend, giving higher removal efficiencies at higher pH (8). The adsorption capacities of IOCS and GFH at an equilibrium arsenic concentration of 10 g/L were found to be between 2.0 and 3.1 mg/g for synthetic water without calcium and between 2.8 and 5.3 mg/g when 80 mg/L of calcium was present at the studied pH values. After 10 hours of filter run in RSSCT, approximately 1000 empty bed volumes, the ratios of C/Co for As(V) were 26% and 18% for calcium-free model water; and only 1% and 0.2% after addition of 80 mg/L of Ca for filter columns with IOCS and GFH, respectively. The adsorption of As(III) and As(V) onto GFH follows a second-order reaction, with and without addition of calcium. The adsorption of As(III) and As(V) onto IOCS follows a first-order reaction without calcium addition, and moves to the second-reaction-order kinetics when calcium is added. Based on the intraparticle diffusion model, the main controlling mechanism for As(III) adsorption is intraparticle diffusion, while surface diffusion contributes greatly to the adsorption of As(V).
    Citation
    Uwamariya, V., Petrusevski, B., Lens, P. N. L., & Amy, G. (2014). Effect of calcium on adsorptive removal of As(III) and As(V) by iron oxide-based adsorbents. Environmental Technology, 35(24), 3153–3164. doi:10.1080/09593330.2014.934739
    Sponsors
    The authors thank the Netherlands Government for providing financial assistance through the Netherlands Fellowship Program under Grant no. 32000022.
    Publisher
    Informa UK Limited
    Journal
    Environmental Technology
    DOI
    10.1080/09593330.2014.934739
    ae974a485f413a2113503eed53cd6c53
    10.1080/09593330.2014.934739
    Scopus Count
    Collections
    Articles; Biological and Environmental Science and Engineering (BESE) Division; Environmental Science and Engineering Program; Water Desalination and Reuse Research Center (WDRC)

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