College of Science, Hunan Agricultural University, Changsha 410128, China; Tobacco Research Institute, Hunan Agricultural University, Changsha 410128, China.
College of Science, Hunan Agricultural University, Changsha 410128, China.
J Hazard Mater. 2017 Aug 5;335:170-177. doi: 10.1016/j.jhazmat.2017.04.042. Epub 2017 Apr 18.
Porous chemical pretreated Saccharomyces cerevisiae was used as support, stabilizer, and reducing agent for the rapid green synthesis of gold nanocatalyst. Au nanoparticles (Au NPs) were generated through in-situ reduction of the absorbed Au(III) by the reductive functional groups of mannoproteins in yeast cell wall. The obtained spherical mono-dispersed Au NPs have an average particle diameter of 9.99±1.63nm as evidenced by TEM image, and exhibits excellent catalytic activity for the dechlorination of quinclorac to 8-quinoline-carboxylic acid by sodium borohydride. The reductive dechlorination of quinclorac is chemical reaction controlled and follows pseudo-first-order kinetic model. The rate constant increases with the increase of the temperature and decrease of the initial quinclorac concentration. The present synthesis protocol of Au nanocatalyst has the advantages of rapid, convenient and mild operation, high catalytic dechlorination efficiency and organic solvent-free nature.
多孔化学预处理酿酒酵母被用作载体、稳定剂和还原剂，用于快速绿色合成金纳米催化剂。通过酵母细胞壁中甘露糖蛋白的还原官能团吸附的 Au(III)原位还原生成 Au 纳米颗粒（Au NPs）。TEM 图像表明，得到的球形单分散 Au NPs 的平均粒径为 9.99±1.63nm，并表现出对硼氢化钠还原喹禾灵生成 8-喹啉羧酸的优异催化活性。喹禾灵的还原脱氯是化学反应控制的，遵循准一级动力学模型。速率常数随温度的升高和初始喹禾灵浓度的降低而增加。本 Au 纳米催化剂的合成方法具有快速、方便、温和的操作、高催化脱氯效率和无有机溶剂的优点。
