摘要
葡萄籽提取物通过生物还原制备纳米银粒子,讨论前驱体(硝酸银)浓度对纳米银生物还原制备及其催化性能的影响。结果表明,提高前驱体浓度有利于提高葡萄籽纳米银溶液的产率;葡萄籽纳米银粒子的平均粒径约为40 nm,前驱体浓度变化对葡萄籽纳米银粒子粒径的影响有限。为了测定不同葡萄籽纳米银的催化性能,以硼氢化钠为还原剂,直接紫1和直接红23染料为目标降解物进行催化还原降解实验。结果表明,在不添加纳米银的条件下,硼氢化钠无法有效还原降解直接紫1和直接红23;葡萄籽纳米银粒子可催化还原降解直接紫1和直接红23,在9 min内,直接紫1和直接红23溶液的降解率最高达到78.87%和70.69%。在催化还原降解直接紫1(双偶氮结构)时,由于4种葡萄籽纳米银粒子的催化性能优异且平均粒径差异较小,催化反应速率常数比较接近;当催化还原降解结构更复杂的直接红23(双偶氮结构且含有3个亚氨基)时,由于更高浓度的硝酸银溶液制备的纳米银粒子浓度更高,催化性能更强。
Silver nanoparticles(AgNPs)was prepared by grape seed extract through bioreduction,and the effects of precursor concentration on the bioreduction and catalytic performance of AgNPs were discussed.The results showed that increasing the concentration of precursor was beneficial to increase the yield of nano silver solution.The average particle size of grape size AgNPs was around 40 nm,and the effect of precursor concentration on the average size of AgNPs was limited.In order to determine the catalytic performance of different AgNPs,the catalytic reduction degradation experiments were carried out by using sodium borohydride as reducing agent and direct dyes(direct violet 1 and direct red 23)as the target degradation dyes.The results showed that soduim borohydride could not reduce the direct violet 1 and direct red 23 effectively without the addition catalyst of AgNPs,while grape seed extract AgNPs could catalyze direct violet 1 and direct red 23 and the degradation of direct violet 1 and direct fed 23 reached up to 78.87%and 70.69%within 9 min.In the process of catalytic reduction degradation of direct violet 1(bisazo structure),the catalytic reaction rate constants of direct violet 1 were close due to the excellent catalytic performance of four kinds of AgNPs and the average particle size difference was small.When the direct red 23 dye with more complex structure(double azo mechanism and containing three imine groups)was degraded,the silver nanoparticles prepared by higher concentration silver nitrate solution had higher concentration and showed stronger catalytic performance.
作者
许磊
张蓉
包丽
顾文娟
周谨
杨雷
XU Lei;ZHANG Rong;BAO Li;GU Wenjuan;ZHOU Jin;YANG Lei(Suzhou Institute of Trade and Commerce,School of Textiles and Clothing and Arts and Media,Suzhou 215009,China;College of Materials and Textiles,Zhejiang Sci-Tech University,Hangzhou 310018,China;Suzhou Institute of Fiber Inspection,Suzhou 215128,China)
出处
《印染助剂》
CAS
2021年第5期24-29,共6页
Textile Auxiliaries
基金
江苏省自然科学基金面上项目(BK20201182)
江苏省优秀科技创新团队资助(苏教科〔2017〕6号)
江苏省大学生创业训练项目(201912685024T)
江苏省大学生创新创业训练计划项目(202012685018Y)
江苏省市场监督管理局科技计划项目(KJ204133)
苏州经贸职业技术学院科研项目(KY-ZRA1802)。
关键词
葡萄籽提取物
纳米银
前驱体
催化性能
直接染料
grape seed extract
silver nanoparticles
precursor
catalytic performance
direct dyes
