An Eco-friendly Approach to ZnO NP Synthesis Using Citrus reticulata Blanco Peel/Extract: Characterization and Antibacterial and Photocatalytic Activity

被引:15
作者
Vasiljevic, Zorka [1 ]
Vunduk, Jovana [2 ]
Bartolic, Dragana [1 ]
Miskovic, Goran [3 ]
Ognjanovic, Milos [4 ]
Tadic, Nenad B. [5 ]
Nikolic, Maria Vesna [1 ]
机构
[1] Univ Belgrade, Inst Multidisciplinary Res, Belgrade 11030, Serbia
[2] Inst Gen & Phys Chem, Belgrade 11158, Serbia
[3] Silicon Austria Labs GMBH, A-9524 Villach, Austria
[4] Univ Belgrade, Inst Nucl Sci Vinca, Belgrade 11000, Serbia
[5] Univ Belgrade, Fac Phys, Belgrade 11000, Serbia
关键词
ZnO; green synthesis; agro-waste; Citrus reticulata; antibacterial activity; photocatalysis; GREEN SYNTHESIS; ANTIOXIDANT CAPACITY; NANOPARTICLES; PEEL; SIZE; MECHANISM; LIGHT; RATIO;
D O I
10.1021/acsabm.4c00079
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
Emission of greenhouse gases and infectious diseases caused by improper agro-waste disposal has gained significant attention in recent years. To overcome these hurdles, agro-waste can be valorized into valuable bioactive compounds that act as reducing or stabilizing agents in the synthesis of nanomaterials. Herein, we report a simple circular approach using Citrus reticulata Blanco (C. reticulata) waste (peel powder/aqueous extract) as green reducing and capping/stabilizing agents and Zn nitrate/acetate precursors to synthesize ZnO nanoparticles (NPs) with efficient antimicrobial and photocatalytic activities. The obtained NPs crystallized in a hexagonal wurtzite structure and differed clearly in their morphology. UV-vis analysis of the nanoparticles showed a characteristic broad absorption band between 330 and 414 nm belonging to ZnO NPs. Fourier transform infrared (FTIR) spectroscopy of ZnO NPs exhibited a Zn-O band close to 450 cm-1. The band gap values were in the range of 2.84-3.14 eV depending on the precursor and agent used. The crystallite size obtained from size-strain plots from measured XRD patterns was between 7 and 26 nm, with strain between 16 and 4%. The highly crystalline nature of obtained ZnO NPs was confirmed by clear ring diffraction patterns and d-spacing values of the observed lattice fringes. ZnNPeelMan_400 and ZnNExtrMan showed good stability, as the zeta potential was found to be around -20 mV, and reduced particle aggregation. Photoluminescence analysis revealed different defects belonging to oxygen vacancies (VO + and VO +2) and zinc interstitial (Zni) sites. The presence of oxygen vacancies on the surface of ZnAcExtrMan_400 and ZnAcPeelMan_400 increased antimicrobial activity, specifically against Gram-negative bacteria Escherichia coli (E. coli) and Salmonella enteritidis (S. enteritidis). ZnNExtrMan with a minimal inhibitory concentration of 0.156 mg/mL was more effective against Gram-positive bacteria Staphylococcus aureus (S. aureus), revealing a high influence of particle size and shape on antimicrobial activity. In addition, the photocatalytic activity of the ZnO NPs was examined by assessing the degradation of acid green dye in an aqueous solution under UV light irradiation. ZnAcPeelMan_400 exhibited excellent photocatalytic activity (94%) within 90 min after irradiation compared to other obtained ZnO NPs.
引用
收藏
页码:3014 / 3032
页数:19
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