摘要
以新鲜澳橙果皮提取液作为还原剂和稳定剂合成载银石墨烯(rGO-Ag)。通过试验探究反应时间、温度、AgNO 3 浓度对rGO-Ag反应率、平均粒径大小及分散液稳定性的影响;以rGO-Ag平均粒径为考察指标进行正交试验,得到最优合成条件。结果表明,延长反应时间、提高反应温度、适当增加AgNO 3 浓度可提高rGO-Ag反应率、降低平均粒径,但对分散液稳定性影响较小。正交试验结果表明,各因素对rGO-Ag平均粒径的影响大小顺序为:反应温度>反应时间>AgNO 3 浓度,最佳工艺条件为:反应时间4 h,温度100 ℃,AgNO 3 浓度25 mmol/L。透射电镜、拉曼光谱和傅里叶变换红外光谱的结果证实平均粒径为21 nm AgNPs成功负载到了还原氧化石墨烯片层上。
Fresh orange peel extract was used as a reducing agent and a stabilizer to synthesize rGO loaded with Ag nanoparticles (rGO-Ag), which can be used as an antibacterial nano-filler to fabricate antibacterial food packaging materials. The effects of reaction time, temperature and AgNO 3 concentration on the reaction rate, average particle size and dispersion stability of rGO-Ag were investigated by single factor experiments. The orthogonal experiment was conducted to optimize the reaction conditions using the average particle size of rGO-Ag as an indicator. Results revealed that extending the reaction time, increasing reaction temperature and AgNO 3 concentration improved the reaction rate and reduced the average particle size of rGO-Ag. However, these factors had little effect on the stability of rGO-Ag dispersions. The effects of these factors on the average particle size of rGO-Ag from large to small was as follows: reaction temperature>reaction time>AgNO 3 concentration. The optimum conditions for rGO-Ag synthesis were: reaction time 4 h, reaction temperature 100 ℃, and AgNO 3 concentration 25 mmol/L . TEM, Raman and FTIR results revealed that AgNPs with an average particle size of 21 nm were successfully loaded onto rGO sheets.
作者
谢东梅
徐丹
任丹
XIE Dong-mei;XU Dan;REN Dan(College of Food Science, Southwest University, Chongqing 400715, China)
出处
《食品与机械》
北大核心
2019年第6期114-119,共6页
Food and Machinery
基金
重庆市社会事业与民生保障科技创新专项一般项目(编号:cstc2015shmszx80011)
关键词
橙皮
还原
石墨烯
纳米银
结构表征
orange peel extract
reduction
graphene
nanosilver
