Effect of pH on the growth of zinc oxide nanorods using Citrus aurantifolia extracts

Rafaie, H. A.; Samat, Nurul Ain; Nor, Roslan Md

doi:10.1016/j.matlet.2014.09.033

Cited by 27 publications

(10 citation statements)

References 14 publications

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“…With increase of pH from 4 to 8, surface plasmon resonance (SPR) absorption peak shifted to larger wavelength indicating the formation of larger size ZnO nanoparticles and the red shift; however with increase of pH from 8 to 10, SPR absorption peak shifted to the blue shift that will be due to smaller size of ZnO nanoparticles [42]. It is found that at the strongly alkaline condition, the 2 , which could restrain the production of ZnO nanoparticles [43,44]. The area under the SPR-peak in the UV-Vis spectra directly depends on the shape and size of the metal nanoparticles as well as dielectric constant of the metal and the surrounding medium in aqueous suspensions [45] and causes the spectrum to be noisy.…”

Section: Resultsmentioning

confidence: 98%

Influence of temperature and concentration on biosynthesis and characterization of zinc oxide nanoparticles using cherry extract

2018

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Due to distinguishing characteristics of nanoparticles (NPs) in terms of size, shape, chemical composition, transmittal and different applications, nanotechnology is considered as an interesting domain of research. Application of metallic NPs is important because of the diminution of dimensions and thus the unique thermal, optical and electronic properties. This research attempts to explore the synthesis of zinc oxide NPs. Zinc oxide NPs have been synthesized using cherry extract under different pH, temperature and concentration and then optimum conditions for the synthesis of them were determined. For further investigations, UV-Vis spectroscopy, scanning electron microscopy (SEM), X-ray diffraction (XRD) and Fourier infrared transformation spectroscopy (FTIR) were used. The solution containing zinc oxide NPs showed a major absorbance of 378 nm which confirmed the synthesis of zinc oxide NPs, and spherical morphology of NPs was observed in SEM images. Zinc oxide NP sizes were 6.5 and 20.18 nm which are obtained by UV-Vis spectra and XRD spectrum, respectively. Also, based on the FTIR spectra of the extract obtained before and after the synthesis, the existence of the reducing agents in herbal extract was confirmed. According to this study, the biological synthesis of NPs using plant extracts can be considered as a cost-effective and efficient method of biological synthesis of NPs and it could be an appropriate replacement to typical chemical methods for the synthesis of NPs.

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Section: Resultsmentioning

confidence: 98%

Influence of temperature and concentration on biosynthesis and characterization of zinc oxide nanoparticles using cherry extract

2018

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“…It is found that at strongly alkaline condition, the more abundance OH ions in the solution, make complex with Zn 2C cations which promoted the molecules Zn(OH) 2 and (Zn[OH 2À 4 ), which could restrain the production of ZnO Nps. [29] Moreover, in alkaline solution at higher pH, enhanced growth of ZnO Nps was significant when compared to those obtained at lower pH.…”

Section: Preparation Of Zinc Oxide Nanoparticlesmentioning

confidence: 93%

Potato extract as reducing agent and stabiliser in a facile green one-step synthesis of ZnO nanoparticles

Buazar

Bavi

Kroushawi

et al. 2015

Journal of Experimental Nanoscience

117

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A facile green recipe was developed to synthesise highly pure, safe and durable zinc oxide nanoparticles (ZnO Nps) using homemade starch-rich potato extract. The ZnO Nps were synthesised using zinc nitrate and potato extract, and the whole reaction is carried out for 30 min at 80 C. In the synthesis, starch-rich potato extract acted as the reducing agent and as a stabilising layer on freshly formed ZnO Nps. Hexagonal (wurtzite) shaped ZnO Nps with size about 20 § 1.2 nm were synthesised and characterised using X-ray diffraction, transition electron microscope and scanning microscopy analyses. Fourier transform infrared spectral analysis indicated that highly pure ZnO nanopowders were obtained at higher temperatures. The use of environmentally benign and renewable material as the respective reducing and protecting agents, starch-rich potato extract, as well as a gentle solvent medium (H 2 O), offered a simple and quite efficient procedure for the synthesis of ZnO Nps in neutral medium with promising potential for biological and biomedical applications.

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“…While the pH value of the synthesis media significantly affects the properties, size, and morphology of the synthesized ZnO-NP [ 13 , 14 , 15 , 16 , 17 ], low pH values are also not suitable for in situ synthesis on cellulosic fabric as it is sensitive to the acidic medium. Moreover, the synthesis of ZnO in an acidic medium (pH ˂ 7) hinders the growth and formation of ZnO due to the low amount of hydroxyl ions (OH − ) that contribute to the formation of the intermediate molecule zinc hydroxide (Zn(OH) 2 ), which facilitates the formation of ZnO [ 18 , 19 , 20 ]. The majority of green syntheses of ZnO are still performed in the presence of NaOH or KOH, since alkaline pH is required for successful reduction from zinc salt [ 21 , 22 , 23 , 24 ].…”

Section: Introductionmentioning

confidence: 99%

Novel Green In Situ Synthesis of ZnO Nanoparticles on Cotton Using Pomegranate Peel Extract

et al. 2021

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This work presents the novel and entirely green in situ synthesis of zinc oxide nanoparticles (ZnO-NP) on cotton fabric. Pomegranate peel extract was used as a reducing agent and wood ash extract was used as an alkali source for the formation of ZnO-NP from zinc acetate. Four different synthesis methods, which varied in drying between immersion of fabric in the active solutions for synthesis and the use of padding and ultrasonication, were investigated to evaluate the most suitable one to achieve excellent ultraviolet (UV) protective properties of the functionalized textile. For comparison, the cotton fabrics were also functionalized with each active solution separately or in a combination of two (i.e., Zn-acetate and plant extract). Scanning electron microscopy (SEM), inductively coupled plasma mass spectroscopy (ICP-MS), Fourier transform infrared spectroscopy (FTIR), X-ray diffractometry (XRD) analysis, and atomic force microscopy (AFM) confirm the successful formation of ZnO-NP on cotton. Among the synthesis methods, the method that included continuous drying of the samples between immersion in the active solutions for synthesis (Method 4) was found to be the most suitable to deliver uniformly impregnated cotton fibers with numerous small ZnO wurtzite structured crystals and excellent UV protection, with a UV protection factor of 154.0. This research presents an example of a green circular economy where a bio-waste material can be used to produce ZnO-NP directly on cotton at low temperatures and short treatment times without the addition of chemicals and enables the production of cellulosic fabrics with excellent UV protection.

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Effect of pH on the growth of zinc oxide nanorods using Citrus aurantifolia extracts

Cited by 27 publications

References 14 publications

Influence of temperature and concentration on biosynthesis and characterization of zinc oxide nanoparticles using cherry extract

Influence of temperature and concentration on biosynthesis and characterization of zinc oxide nanoparticles using cherry extract

Potato extract as reducing agent and stabiliser in a facile green one-step synthesis of ZnO nanoparticles

Novel Green In Situ Synthesis of ZnO Nanoparticles on Cotton Using Pomegranate Peel Extract

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