摘要
纸浆的主要组分为纤维素与半纤维素,二者都具有还原性基团,使用浆料原位还原Ag^+为纳米银并附着在纤维表面,确定载纳米银纤维素制备的条件,并探究碱/酶预处理对载纳米银纤维素制备中银负载率的影响;用抑菌圈法测定载纳米银纤维素材料的抗菌性能,并用扫描电镜观察了其表面形貌.结果表明:纤维素纤维表面较光滑,而载纳米银纤维素表面出现颗粒状的纳米银,且其抗菌效果随银负载量的增加而增加;碱预处理存在一个最佳碱浓,且最佳碱浓与浆料种类有关;在5%碱浓条件下预处理浆料,其银离子利用率均得到有效的提升,且随着碱处理时间的延长,其银离子利用率呈现增高的趋势;而使用酶预处理后,不同浆料有不同的变化规律.
As the main component of chemical pulp,cellulose and hemicellulose had reductive groups which can be used to reduce Ag＋.Silver nanoparticles,which were obtained by in situ reduction,were adsorbed on cellulose.The preparation condition of cellulose-silver compos-ites and the effect of alkaline and xylanase pretreatment on silver content in cellulose-silver composites was investigated by atom absorption spectroscopy.The morphology of cellulose-silver composites was investigated by scanning electron microscopy （SEM）,and the antibac-terial activity of the composites was determined by inhibitory zone test.The surface of cellu-lose fiber is smooth,while silver nanoparticles were loaded on the surface of cellulose-silver composites.The inhibitory zone was increased with the increase of silver content.The opti-mum alkaline concentration was related to the kind of pulp in alkaline pretreatment.Silvercontent in cellulose-silver composite could be increased after alkaline pretreatment.As time of pretreatment goes on,silver content also could be increased.Different kinds of pulp had had different changes after xylanase pretreatment.
出处
《陕西科技大学学报（自然科学版）》
2016年第3期6-11,共6页
Journal of Shaanxi University of Science & Technology
基金
国家自然科学基金项目(31170559)
华南理工大学制浆造纸工程国家重点实验室开放基金项目(200514077)
陕西科技大学学术带头人培养计划项目(XKD201002)
关键词
碱/酶预处理
原位还原
银负载率
抗菌效果
alkaline/xylanase pretreatment
in situ reduction
silver content
antibacterial ac-tivity
