Musa Aminu, Ahmad Mansor B, Hussein Mohd Zobir, Saiman Mohd Izham, Sani Hannatu Abubakar
Department of Chemistry, Faculty of Science, Universiti Putra Malaysia, 43400 UPM, Serdang, Selangor, Malaysia.
Department of Pure and Industrial Chemistry, Faculty of Natural and Applied Sciences, Umaru Musa Yar'adua University, Katsina, Dutsin-ma Road, P.M.B 2218, Katsina, 820001, Nigeria.
Nanoscale Res Lett. 2016 Dec;11(1):438. doi: 10.1186/s11671-016-1656-6. Epub 2016 Oct 1.
The synthesis of copper nanoparticles was carried out with gelatin as a stabilizer by reducing CuSO.5HO ions using hydrazine. Ascorbic acid and aqueous NaOH were also used as an antioxidant and pH controller, respectively. The effects of NaOH, hydrazine, and concentration of gelatin as stabilizer were studied. The synthesized copper nanoparticles were characterized by UV-vis spectroscopy, XRD, zeta potential measurements, FTIR, EDX, FESEM, and TEM. The formation of CuNPs@Gelatin is initially confirmed by UV-vis spectroscopic analysis with the characteristic band at 583 nm. XRD and TEM reports revealed that CuNPs@Gelatin (0.75 wt.%) is highly crystalline and spherical in shape with optimum average size of 4.21 ± 0.95 nm. FTIR studies indicated the presence of amide group on the surface of the CuNPs indicating the stability of CuNPs which is further supported by zeta potential measurements with the negative optimum value of -37.90 ± 0.6 mV. The CuNPs@G4 showed a good catalytic activity against methylene blue (MB) reduction using NaBH as a reducing agent in an aqueous solution. The best enhanced properties of CuNPs@G4 were found for the 0.75 wt.% gelatin concentration. Thermodynamic parameters (ΔH and ΔS) indicate that under the studied temperature, the reduction of MB by CuNPs@G4 is not feasible and had endothermic in nature.
以明胶为稳定剂，通过肼还原CuSO₄·5H₂O离子来进行铜纳米颗粒的合成。抗坏血酸和氢氧化钠水溶液还分别用作抗氧化剂和pH调节剂。研究了氢氧化钠、肼以及明胶作为稳定剂的浓度的影响。通过紫外可见光谱、X射线衍射（XRD）、zeta电位测量、傅里叶变换红外光谱（FTIR）、能量散射X射线光谱（EDX）、场发射扫描电子显微镜（FESEM）和透射电子显微镜（TEM）对合成的铜纳米颗粒进行了表征。通过紫外可见光谱分析在583 nm处的特征峰初步证实了CuNPs@明胶的形成。XRD和TEM报告显示，CuNPs@明胶（0.75 wt.%）具有高度结晶性且呈球形，最佳平均尺寸为4.21±0.95 nm。FTIR研究表明CuNPs表面存在酰胺基团，表明CuNPs具有稳定性，zeta电位测量得到的-37.90±0.6 mV的最佳负值进一步支持了这一点。在水溶液中，以硼氢化钠（NaBH₄）为还原剂，CuNPs@G4对亚甲基蓝（MB）的还原表现出良好的催化活性。对于0.75 wt.%的明胶浓度，发现CuNPs@G4具有最佳的增强性能。热力学参数（ΔH和ΔS）表明，在所研究的温度下，CuNPs@G4还原MB是不可行的，且本质上是吸热的。
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