Abstract
A novel composite adsorbent (ST-CTA-SS) composed of starch-3-chloro-2-hydroxypropyl triethyl ammonium chloride (ST-CTA) and micro silica-sand (SS) was prepared simply, with the characteristics of environmental-friendliness and low cost. A variety of techniques were used for characterizing the surface morphology, molecular structure, and settleability of this composite adsorbent. ST-CTA-SS was applied to the removal of arsenate [As(V)] and two anionic dyes, acid green 25 (AG25) and methyl orange (MO), from water in respective single and two metal-dye binary systems. ST-CTA-SS shows a marked improvement of the adsorption capacities for the aforementioned three pollutants, which is attributed to the prominent composited structure compared with ST-CTA without SS. The adsorption capacities of ST-CTA-SS for AG25, MO, and As(V) are up to approximately 912.6 ± 44.6, 458.7 ± 21.3, and 76.63 ± 3.53 mg g−1, respectively, and the adsorption saturations for those three pollutants are all achieved within 20 min. Moreover, this composite adsorbent always exhibited highly selective adsorption of dyes, either MO or AG25, over As(V) from their aqueous mixtures. After saturated adsorption, ST-CTA-SS could be rapidly settled and separated from water due to the imbedded SS, which could be easily regenerated by dilute NaOH solutions. This starch-based composite adsorbent thus owns significant application potentials in water treatment.
Published Version
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