Synthesis and characterization of copper oxide nanoparticles from waste printed circuit boards and its anti-bacterial applications

Balaji Ravi, J. Karthick, Arun Murugesan
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Abstract

Our ecology is being threatened by electronic garbage. It takes time and effort to handle and recycle electronic trash. Researchers are trying to improve the existing recycling methods for a more effective process which produce fewer by-products. The present study is to develop a simple and practical hydrometallurgical process for producing copper oxide nanoparticles (CuO NPs) from waste printed circuit board (WPCB). WPCBs are selectively leached using aqueous ammonium salt, ammonia buffer which undergo precipitation at 2 N sodium hydroxide solution at 80 °C for 1 h. The precipitates undergo repeated centrifugation at 4000 rpm for 5 min to remove the impurities. To eliminate residual moisture, they were initially dried in a hot air oven at 100 °C and subsequently calcined in a muffle furnace at 500 °C for 3 h. XRD, HRTEM, FESEM-EDS, and FTIR are used to analyze synthesized copper oxide nanoparticles, which have applications in inhibiting the bacterial growth. The synthesized particles exist as nanospheres with an average diameter of 50 nm and possess a monoclinic crystal structure. The anti-bacterial activities of copper oxide nanoparticles were evaluated by varying their concentrations from 25 mg/mL to 100 mg/mL. The results showed significant inhibition against Klebsiella pneumoniae with inhibition zone of 25 mm at 100 mg/mL CuO concentration, using the disc diffusion method.
废弃印刷电路板氧化铜纳米颗粒的合成、表征及其抗菌应用
我们的生态正受到电子垃圾的威胁。处理和回收电子垃圾需要时间和精力。研究人员正在努力改进现有的回收方法,使其更有效,产生更少的副产品。本研究旨在开发一种简单实用的湿法冶金工艺,用于从废弃印刷电路板(WPCB)中制备氧化铜纳米颗粒(CuO NPs)。用水铵盐选择性浸出wpcb,氨缓冲液在2 N氢氧化钠溶液中沉淀,80°C, 1 h。沉淀物在4000 rpm下反复离心5 min以去除杂质。为了消除残留的水分,它们首先在100°C的热风炉中干燥,随后在500°C的马弗炉中煅烧3 h。利用XRD、HRTEM、FESEM-EDS和FTIR对合成的氧化铜纳米颗粒进行了分析,发现其具有抑制细菌生长的作用。合成的颗粒以纳米球的形式存在,平均直径为50 nm,具有单斜晶结构。在25 mg/mL到100 mg/mL的浓度范围内,对氧化铜纳米颗粒的抑菌活性进行了评价。结果表明,在100 mg/mL CuO浓度下,采用圆盘扩散法对肺炎克雷伯菌有明显的抑制作用,抑菌带为25 mm。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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