青金桔皮绿色合成金纳米粒子及其催化性能的研究

Green synthesis of gold nanoparticles from kumquat peel and its catalytic performance

采用废弃青金桔皮提取物作为还原剂兼保护剂绿色制备金纳米粒子(AuNPs),优化其绿色制备体系,并对其催化性能进行评估。通过紫外-可见光谱、激光粒度分布仪和傅里叶变换红外光谱(FTIR)等对金纳米粒子进行表征,筛选时间、温度、搅拌速度对制备体系进行优化。结果表明,所制备AuNPs的紫外可见光谱在波长536 nm处具有特征吸收峰,激光粒度分布仪显示其粒径主要分布在2~15 nm之间,平均粒径为6.51 nm。傅里叶红外光谱证实青金桔皮提取物中的还原性物质参与AuNPs的绿色合成,并对4-硝基苯酚(4-NP)还原为对氨基苯酚(4-AP)具有较强的催化活性。最佳制备条件为,青金桔皮提取物浓度50%,反应时间15 min,反应温度30℃,搅拌速度1300 r/min。综上所述,此类型AuNPs的制备工艺操作简便,经济环保,在食品工业、环境保护、生物与医药等领域将具有广阔的应用前景与实用价值。

The gold nanoparticles(AuNPs)were prepared by using the extract of waste green kumquat peel as reducing agent and protective agent,the green preparation system of AuNPs was optimized and AuNPs catalytic performance was evaluated.The synthesized AuNPs were characterized by UV-vis spectroscopy,laser particle size distribution and Fourier transform infrared spectroscopy(FTIR),and the preparation system was optimized by screening temperature,time and stirring speed.The results showed that the UV-vis spectra of the prepared AuNPs had a characteristic absorption peak at 536 nm,and the laser particle size distributor showed that the particle size of the prepared AuNPs mainly ranged from 2 to 15 nm,with an average particle size of 6.51 nm.FTIR confirmed that the reductants in the green kumquat peel extracts participated in the AuNPs green synthesis.Furthermore,the synthesized AuNPs showed strong catalytic activity for degradation of 4-nitrophenol(4-NP)to p-aminophenol(4-AP).And the optimal preparation conditions were as follows:the concentration of orange peel extract was 50%,the reaction time was 15 min,the reaction temperature was 30℃,and the stirring speed was 1300 r/min.In summary,the preparation process of AuNPs was easy to operate,economic and environment friendly,it will have broad application prospect and practical value in food industry,environmental protection,biology and medicinefield.