Trichosporon montevideense WIN提取物合成纳米金及其对硝基芳烃的催化特性

发布时间：2018-02-04 00:44

本文关键词： 纳米金生物合成 Trichosporon montevideense 硝基芳烃催化活性　出处：《应用与环境生物学报》2017年03期 　论文类型：期刊论文

【摘要】：利用生物及其提取物合成纳米金具有反应条件温和、环境友好等优点.以菌株Trichosporon montevideense WIN提取物合成纳米金(Au NPs),考察反应时间、p H和提取物浓度对纳米金合成的影响,并探讨纳米金催化还原硝基芳烃的特性.结果显示,纳米金合成过程可在7 d内稳定,最优p H为7.0,最适提取物浓度为300 mg/L.通过紫外-可见光谱扫描、透射电子显微镜和傅立叶转换红外线光谱分析可知,纳米金为球形和伪球形,尺寸分布范围为4-35 nm,平均粒径为(18.2±0.4)nm,推测提取物中的羟基、氨基和羧基参与了纳米金的还原和稳定过程.纳米金对2-硝基苯酚、3-硝基苯酚、4-硝基苯酚、2-硝基苯胺和3-硝基苯胺具有良好的催化活性,其催化反应速率常数分别为7.5×10~(-3)s~(-1)、6.4×10~(-3) s~(-1)、9.1×10~(-3) s~(-1)、11.8×10~(-3) s~(-1)和20.7×10~(-3) s~(-1).本研究表明T.montevideense WIN在生物合成纳米金方面具有潜在的应用价值,且合成的生物纳米金能够有效应用于硝基芳烃污染物的催化还原.
[Abstract]:The synthesis of nanocrystalline gold from biological and its extracts has mild reaction conditions. The Trichosporon montevideense WIN extract was used to synthesize nano-gold au NPsN, and the reaction time was investigated. The effects of pH and extract concentration on the synthesis of gold nanoparticles were discussed. The results showed that the synthesis process of gold nanoparticles could be stabilized within 7 days and the optimum pH was 7.0. The optimum concentration of the extract was 300 mg / L. By UV-Vis spectral scanning, transmission electron microscope and Fourier transform infrared spectroscopy, the gold nanoparticles were spherical and pseudo-spherical. The size distribution range is 4-35 nm, the average particle size is 18.2 卤0.4 nm, and the hydroxyl group in the extract is speculated. Amino and carboxyl groups are involved in the reduction and stabilization of gold nanoparticles. Gold nanoparticles have good catalytic activity for 2-nitrophenol 3-nitrophenol 4-nitrophenol 2-nitroaniline and 3-nitroaniline. The rate constants of the catalytic reaction are 7.5 脳 10 ~ (-3) ~ (-1) ~ (?) ~ 6. 4 脳 10 ~ (-3) ~ (?) ~ (1) ~ (1) and 9.1 脳 10 ~ (10) ~ (-3) ~ (?) ~ ((1)). 11.8 脳 10 ~ (-3) SJ ~ (-1) and 20.7 脳 10 ~ (10 ~ (-3)) S ~ (1)). This study indicates that T. montevideense WIN has potential application value in biosynthesis of nanocrystalline gold. The synthesized biological nanocrystalline gold can be effectively applied to the catalytic reduction of nitroaromatic pollutants.
【作者单位】：大连理工大学环境学院工业生态与环境工程教育部重点实验室;
【基金】：国家自然科学基金项目(51508068) 新世纪优秀人才支持计划(NCET-13-0077) 中央高校基本科研业务费专项资金(DUT14YQ107)资助~~
【分类号】：TB383.1;X505
【正文快照】： CLC X172近年来,纳米金(Au NPs)凭借其独特的物理化学特性逐渐成为纳米技术领域的研究热点,在催化和生物医学等方面具有广泛的应用[1-3].利用生物及其提取物合成纳米金的方法具有反应条件温和、绿色低毒等优点,受到研究者的广泛关注[1].据报道,已有多种微生物用于纳米金合成,

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