基于毛竹半纤维素的银纳米粒子的绿色合成

发布时间：2018-03-18 10:38

  本文选题：银纳米粒子　切入点：毛竹半纤维素　出处：《材料导报》2017年22期 　论文类型：期刊论文

【摘要】：直接以碱溶性毛竹半纤维素为稳定剂、葡萄糖为还原剂,在水介质中绿色合成银纳米粒子,讨论了合成条件对银纳米粒子的形成和储存稳定性的影响,表征了银纳米粒子-半纤维素复合物经热处理后获得的Ag-C复合物的物理化学特性,并讨论了银纳米粒子的可能形成机理。在恒定其他反应条件下,延长反应时间会有更多银纳米粒子生成,但过度延长反应时间会使银纳米粒子发生团聚而生成大颗粒的粒子;高的葡萄糖浓度、反应温度和初始半纤维素用量会加快银纳米粒子的生成。银纳米粒子的平均粒径和粒径分布范围均随半纤维素用量的增大而减小,而银纳米粒子在4℃的储存稳定性随半纤维素用量的增大而增强。银纳米粒子-半纤维素复合物在空气气氛中300℃热处理1h后获得的Ag-C复合物中同时存在金属态的银和氧化态的银。半纤维素中呈电负性的大量自由羟基和少量羧基可能对银纳米粒子的形成起至关重要的作用。
[Abstract]:Silver nanoparticles were synthesized directly in aqueous medium with alkali-soluble bamboo hemicellulose as stabilizer and glucose as reducing agent. The effects of synthesis conditions on the formation and storage stability of silver nanoparticles were discussed. The physicochemical properties of silver nanoparticles and hemicellulose composites after heat treatment were characterized, and the possible formation mechanism of silver nanoparticles was discussed. The longer the reaction time is, the more silver nanoparticles are formed, but the longer the reaction time is, the more agglomerated the silver nanoparticles are, and the larger the glucose concentration is. The reaction temperature and initial hemicellulose content can accelerate the formation of silver nanoparticles, and the average particle size and particle size distribution range of silver nanoparticles decrease with the increase of hemicellulose content. However, the storage stability of silver nanoparticles at 4 鈩，

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