Abstract
Millions of people in more than 70 countries are at risk of developing arsenicosis and otherhealth issues due to consuming elevated arsenic contaminated water. The present study aimed to use naturalclays heated at high temperature and treated with ferrous and ferric solutions through a simple coatingtechnique enhanced by moderate temperature for arsenate uptake from water. BET, XRF, XRD and SEMmethods were applied for the adsorbent characterization. Adsorption experiments were conducted in a seriesof batch systems in terms of contact time, solution pH, initial concentration and the presence of coexistinganions. The results indicated that the adsorption kinetics was better described by the pseudo-second order ratemodel for all adsorbents. All adsorbents exhibited higher arsenate uptake efficiency in the acidic condition.Langmuir model provided the maximum arsenate adsorption capacity of 250µg/g, 429.74µg/g and747.38µg/g for calcined clay (MC), ferric calcined clay (MC-FeIII) and ferrous calcined clay (MC-FeII),respectively. Among added coexisting anions, phosphate (PO3-) significantly decreased the arsenateadsorption capacity of all adsorbents. Overall, regarded to a wide availability of raw materials, simplicity ofthe modification and improvement of arsenate adsorption capacity, modified natural clay adsorbents,especially MC-FeII, could be considered to be effective and low-cost to remove arsenate from water.
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