Biomaterials as a support for catalysts are of prime importance. Tapioca root which is an abundant biopolymer source was used to synthesize cellulose supported bio-heterogeneous poly(hydroxamic acid) copper nanoparticles (CuN@PHA) and was characterized by Fourier transform infrared spectroscopy (FTIR), ultraviolet–visible spectroscopy (UV-Vis), field emission scanning electron microscopy (FESEM), X-ray photoelectron spectroscopy (XPS), inductively coupled plasma atomic emission spectroscopy (ICP-AES), transmission electron microscopy (TEM) analyses. The tapioca cellulose supported CuN@PHA (50 mol ppm) effectively catalyzed N-alkylation reaction of aliphatic amines with α,β-unsaturated compounds to give the corresponding alkylated products. High yields up to 95% were achieved for the converted products. The reusability of the cellulose supported nanoparticles was found to be excellent with no significant reduction of its catalytic activity over several cycles. The catalyst showed high catalytic activity having turnover number (TON) 18000 and turnover frequency (TOF) 2250 h−1.
作为催化剂载体的
生物材料至关重要。淀粉作为丰富的
生物聚合物来源,被用于合成
纤维素负载的
生物非均相聚羟
肟酸
铜纳米颗粒(CuN@PHA),并采用傅里叶变换红外光谱(FTIR)、紫外-可见光谱(UV-Vis)、场发射扫描电子显微镜(FE
SEM)、X射线光电子光谱(XPS)、电感耦合等离子体原子发射光谱(ICP-AES)、透射电子显微镜(
TEM)等手段进行了表征。淀粉
纤维素负载的CuN@PHA(50 mol ppm)有效地催化脂肪胺与α,β-不饱和化合物的N-烷基化反应,得到相应的烷基化产物。转化产物的产率高达95%。
纤维素负载的纳米颗粒具有优异的重复使用性,在多次循环中其催化活性没有显著降低。该催化剂显示出高催化活性,其转化数(TON)为18000,转化频率(TOF)为2250 h−1。