新型壳聚糖/纳米二氧化硅杂化材料的制备与性能

在纳米S iO2颗粒表面引入羟丙基氯活性基团,得到功能化S iO2颗粒,再将羟丙基氯化的S iO2颗粒交联固定在壳聚糖上,制备了一种新型的壳聚糖/纳米S iO2杂化材料(简称杂化材料);通过傅里叶变换红外光谱、透射电镜、扫描电镜方法对杂化材料进行表征,采用热重(TG)分析研究杂化材料的热性能;考察了杂化材料的沉降速率和对金属离子Ca2+和M g2+的吸附能力。电镜分析结果表明,杂化材料微粒为纳米尺度的无机S iO2加强化的微粒,S iO2颗粒分散在材料中,形成均匀的表面;TG分析结果表明,杂化材料的热性能有所提高;沉降实验测得壳聚糖和杂化材料作为吸附剂的沉降时间分别为130.3,68.5s,表明杂化材料的沉降速率比壳聚糖的沉降速率快了近一倍;杂化材料对金属离子Ca2+和M g2+的吸附量分别可达到0.289 3,1.445 6mm ol/g。

Preparation and Properties of Novel Chitosan/Nano-Silica Hybrid Material

Functionalized silica particles were obtained by introducing hydroxylpropyl-chlorine on surface of nano-silica particles,and were further used as crosslinker for chitosan to prepare a novel(chitosan/nano)-silica hybrid material.The product was used in purifying drinking water and removing metallic ions from sewage.The chitosan/nano-silica hybrid material was characterized by means of FTIR,TEM and SEM.Results showed the prepared particles of chitosan/nano-silica hybrid material was strengthened by silica which was dispersed within the hybrid material to form uniform surface.Thermal properties of the chitosan/nano-silica hybrid material were also improved,determined by thermogravimetric(TG)and differential thermogravimetric(DTG)analysis.Sedimentary time of chitosan and chitosan/nano-silica hybrid materials as sorbent were 130.3 and 68.5s,respectively.Sedimentary speed of latter was much faster.Adsorption capacities of chitosan/nano-silica hybrid material to Ca~(2+) and Mg~(2+) could attain 0.289 3 and 1.445 6mmol/g,respectively.