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.

简单地制备了由淀粉-3-氯-2-羟丙基三乙基氯化铵（ST-CTA）和微硅砂（SS）组成的新型复合吸附剂（ST-CTA-SS），具有环保，易吸收的特点。低成本。多种技术用于表征这种复合吸附剂的表面形态，分子结构和沉降性。ST-CTA-SS分别用于从单个和两个金属染料二元系统中的水中去除砷酸盐[As（V）]和两种阴离子染料，酸性绿25（AG25）和甲基橙（MO）。ST-CTA-SS对上述三种污染物的吸附能力显着提高，这归因于与不含SS的ST-CTA相比，突出的复合结构。ST-CTA-SS对AG25，MO，^-1，这三种污染物的吸附饱和度均在20分钟内达到。而且，这种复合吸附剂始终显示出染料（MO或AG25）从其水性混合物中对As（V）的高度选择性吸附。饱和吸附后，由于嵌入了SS，因此ST-CTA-SS可以快速沉降并与水分离，可以通过稀NaOH溶液轻松地将其再生。因此，这种淀粉基复合吸附剂在水处理中具有重要的应用潜力。