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在乙醚介质中,通过丁二酸酐与γ-氨丙基三甲氧基硅烷改性后的纳米SiO2(即可分散的纳米SiO2,简称DNS)反应,合成了羧基化的DNS,经过壳聚糖与羧基化的DNS脱水生成酰胺的过程,制备了壳聚糖/DNS杂化材料。通过红外光谱、扫描电镜和热重分析对杂化材料进行表征。研究了壳聚糖及杂化材料微粒吸附Pb2+时pH值、时间、用量对吸附量的影响,结果表明其吸附最佳条件为:pH=5,吸附时间为120min,吸附剂的投加量为0.1g。杂化材料与壳聚糖同样具有甚至更强的吸附Pb2+的能力,其吸附量可达0.9377mmol.g-1。
The carboxylated DNS was synthesized by the reaction of succinic anhydride with γ-aminopropyltrimethoxysilane-modified nano-SiO2 (ie, dispersible nano-SiO2, referred to as DNS) in ether medium. The carboxylated DNS was dehydrated to form amides and chitosan / DNS hybrid materials were prepared. The hybrid materials were characterized by infrared spectroscopy, scanning electron microscopy and thermogravimetric analysis. The effects of pH value, time and dosage on the adsorption capacity of Pb2 + were studied. The results showed that the optimal adsorption conditions were as follows: pH = 5, adsorption time 120min, dosage of adsorbent 0.1g. Hybrid materials and chitosan also have an even stronger ability to adsorb Pb2 +, the adsorption capacity of up to 0.9377mmol.g-1.