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Synthesis of silver nanoparticles using bio valorization coffee waste extract: photocatalytic flow-rate performance, antibacterial activity, and electrochemical investigation
Biomass Conversion and Biorefinery ( IF 4 ) Pub Date : 2022-01-17 , DOI: 10.1007/s13399-021-02256-5
Nagwa El-Desouky 1 , Kamel Shoueir 1, 2 , Ibrahim El-Mehasseb 3 , Maged El-Kemary 1
Affiliation  

It is well known that biogenic synthesis, as compared to other processes, has proven to be highly effective in the fabrication of silver nanoparticles (AgNPs). Thus, our current study focused on synthesizing AgNPs using coffee waste extract (CWE). CWE contains many compounds identified by HPLC, which reduce, cap, and stabilize AgNPs in its solution. The as-synthesized AgNPs were produced with a monodispersed small size around 20 nm and exhibited in-plane dipole plasmon resonances of hexagonal nanoplates. AgNPs were characterized by both physical and spectroscopic methods, which confirmed their nanoscale dimensions with a hexagonal shape. The as-prepared AgNPs (12 mg) enabled the photodegradation of phenol compounds (20 mL) with a removal efficiency of ~ 94.6% in a short time in the presence of citric acid. Additionally, the second promising application of AgNPs was the tendency to remove the hazard 2,4 dinitroaniline (2,4 DNA) with a percent more than 97% while using only 7 mg of AgNPs. Moreover, the green synthesized AgNPs are superior in inhibiting bacterial growth and killing most infected microbes such as B. subtilis, P. aeruginosa, S. aureus, and E. coli. The electrochemical characteristics of the AgNPs were evaluated using a three-electrode system. The calculated specific capacitance was 280 F g−1 at 0.56 A g−1. Furthermore, after 1000 cycles at 2.2 A g−1, the AgNPs electrode demonstrates an excellent cycling stability behavior with 94.8% capacitance retention. Based on the previous promising results, it can be concluded that CWE is an environmentally benign extract to prepare AgNPs with low cost, saving and easily used for many great domains in photocatalytic, phenol compound removals, and production of functional nanodevices.



中文翻译:

使用生物增值咖啡废提取物合成银纳米粒子:光催化流速性能、抗菌活性和电化学研究

众所周知,与其他工艺相比,生物合成已被证明在银纳米粒子 (AgNPs) 的制造中非常有效。因此,我们目前的研究重点是使用咖啡废提取物 (CWE) 合成 AgNP。CWE 包含许多经 HPLC 鉴定的化合物,可减少、限制和稳定其溶液中的 AgNP。合成后的 AgNPs 具有约 20 nm 的单分散小尺寸,并表现出六角纳米板的面内偶极等离子体共振。AgNPs 通过物理和光谱方法进行了表征,证实了它们的纳米级尺寸为六边形。所制备的 AgNPs (12 mg) 使苯酚化合物 (20 mL) 能够在柠檬酸存在的情况下在短时间内以约 94.6% 的去除效率进行光降解。此外,AgNPs 的第二个有前途的应用是去除危险的 2,4 二硝基苯胺(2,4 DNA)的趋势,其百分比超过 97%,而仅使用 7 mg AgNPs。此外,绿色合成的 AgNPs 在抑制细菌生长和杀死大多数受感染的微生物方面具有优越性,例如B. subtilisP. aeruginosaS. aureusE. coli。使用三电极系统评估 AgNPs 的电化学特性。计算出的比电容在 0.56 A g -1时为 280 F g -1此外,在 2.2 A g -1下循环 1000 次后,AgNPs 电极表现出出色的循环稳定性行为,电容保持率为 94.8%。基于之前的有希望的结果,可以得出结论,CWE 是一种环境友好的提取物,可用于制备 AgNPs,成本低、节约且易于用于光催化、酚化合物去除和功能纳米器件生产等许多重要领域。

更新日期:2022-01-18
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