Department of Chemistry and Centre for Advanced Studies in Chemistry, Panjab University, Chandigarh, 160014, India; Department of Chemical Engineering, Faculty of Science and Engineering, University of Hull, Cottingham Road, Hull, HU6 7RX, United Kingdom.
Department of Chemistry, School of Basic and Applied Sciences, Maharaja Agrasen University, Baddi, 174103, India.
Environ Res. 2021 Jun;197:111142. doi: 10.1016/j.envres.2021.111142. Epub 2021 Apr 15.
Pollution of water linked to microbial decontamination and extensive use of sodium chlorite (NaClO) as a disinfectant, especially in the face of the current COVID-19 situation, is a serious water pollution issue that needs to be addressed. In this context, an environmentally friendly and cost-effective method has been developed for the biomimetic synthesis of Ag nanospheres (Ag NSs) using aqueous extract of Piper nigrum for the detection of chlorite (ClO) and mercury (Hg) ions. The strong antioxidant properties of the biomolecules present in the Piper nigrum extract reduce silver ions (Ag) to Ag. After optimization of the formulation parameters, it was observed that 1 mL of piper nigrum extract was sufficient to reduce and stabilize 100 mL of 1.5 mM of Ag in 2.5 h at 30 °C. X-ray diffraction (XRD) pattern of Ag NSs revealed their crystalline nature and the characteristic Bragg's diffraction peaks confirmed their face cubic crystal (FCC) lattice. The characteristic reddish-brown color and absorption surface plasmon resonance (SPR) band at 435 nm confirmed the successful fabrication of Ag NSs. Kinetic analysis revealed a three-phase growth pattern involving nucleation, growth and stabilization. Transmission electron microscopy (TEM) and High-resolution transmission electron microscopy (HRTEM) micrograms, showed spherical NSs with narrow polydispersity with particle size ranging from 10 to 30 nm. The synthesized NSs were exposed to various metal ions and anions. The absorption intensity of Ag NSs quenched in the presence of mercury ions (Hg) among the cations and Chlorite ions (ClO) among the anions. The limit of detection (LOD) of 7.47 μM and 1.11 μM was evaluated from the calibration curve for Hg and ClO, respectively. Based on these promising results, it is suggested that the method reported is a low-cost and one step biogenic protocol for the synthesis of Ag NSs and their employment for the detection of Hg and ClOions.
水的污染与微生物的消毒和广泛使用亚氯酸钠 (NaClO) 有关，尤其是在当前 COVID-19 情况下，这是一个需要解决的严重水污染问题。在这种情况下，已经开发出一种使用胡椒 (Piper nigrum) 水提物仿生合成 Ag 纳米球 (Ag NSs) 的环保且具有成本效益的方法，用于检测亚氯酸盐 (ClO) 和汞 (Hg) 离子。胡椒提物中存在的生物分子具有很强的抗氧化性能，可将银离子 (Ag) 还原为 Ag。在优化配方参数后，观察到 1 mL 胡椒提物足以在 30°C 下 2.5 小时内将 100 mL 1.5 mM 的 Ag 还原并稳定下来。Ag NSs 的 X 射线衍射 (XRD) 图谱表明其具有结晶性，特征布拉格衍射峰证实了其面心立方 (FCC) 晶格。特征的红棕色颜色和 435nm 处的吸收表面等离子体共振 (SPR) 带证实了 Ag NSs 的成功制备。动力学分析揭示了涉及成核、生长和稳定的三相生长模式。透射电子显微镜 (TEM) 和高分辨率透射电子显微镜 (HRTEM) 照片显示，球形 NSs 具有窄的多分散性，粒径范围为 10 至 30nm。合成的 NSs 暴露于各种金属离子和阴离子。在阳离子中，Hg 离子和阴离子中 ClO 离子存在时，Ag NSs 的吸收强度被猝灭。Hg 和 ClO 的校准曲线的检测限 (LOD) 分别为 7.47 μM 和 1.11 μM。基于这些有前景的结果，建议所报道的方法是一种低成本的一步生物合成 Ag NSs 的方法，可用于检测 Hg 和 ClO 离子。
