ABSTRACT

Organic dyes are mostly used in textile, paper, cosmetic, pharmaceutical industries etc., as colouring agents and being disposed in the environment that makes serious health issues. Therefore, this study has focused to the green synthesis of silver nanoparticles (Ag NPs) using AgNO₃ and Punica granatum seeds extract as reducing/capping agent. The plasmonic absorption of obtained silver nanoparticles were observed at 440 nm which assured Ag NPs. Further, the crystalline nature and FCC (face centered cubic) pattern of Ag NPs was confirmed by XRD analysis. The spherical morphology with size 10 to 35 nm of Ag NPs were determined through HRTEM (high resolution transmission electron microscopy) analysis. These Ag NPs have been used as green catalyst to facilitate the reduction of organic pollutants/dye such as 4-nitrophenol and methyl orange in the presence of aq.NaBH₄. This method is considered as eco-friendly and energy efficient for the environmental remediation under the concept of green chemistry.

摘要

有机染料主要用于纺织、造纸、化妆品、制药等行业，作为着色剂并被丢弃在会造成严重健康问题的环境中。因此，本研究的重点是使用 AgNO ₃ 和 石榴石绿色合成银纳米粒子 (Ag NPs) 种子提取物作为还原剂/封端剂。在 440 nm 处观察到获得的银纳米粒子的等离子体吸收，这确保了 Ag NPs。此外，通过XRD分析证实了Ag NPs的结晶性质和FCC（面心立方）图案。通过 HRTEM（高分辨率透射电子显微镜）分析确定了尺寸为 10 至 35 nm 的 Ag NP 的球形形态。这些 Ag NPs 已被用作绿色催化剂，以促进在 aq.NaBH ₄存在下减少有机污染物/染料，如 4-硝基苯酚和甲基橙。该方法被认为是绿色化学概念下环境修复的环保和节能方法。