Synthesis, characterization and antimicrobial activity of alkaline ion-exchanged ZnO/bentonite nanocomposites

Pouraboulghasem, Hamideh; Ghorbanpour, Mohammad; Shayegh, Razieh; Lotfiman, Samaneh

doi:10.1007/s11771-016-3124-y

Cited by 33 publications

(9 citation statements)

References 18 publications

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“…Agar plates were inoculated with 100-lL suspensions of bacteria. Then, anodized samples were placed on agar plates and covered at 37°C for 24 h. The inhibition zone for bacterial growth was observed visually [12].…”

Section: Antibacterial Activitymentioning

confidence: 99%

Antibacterial activity of ZnO films prepared by anodizing

2016

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In the present work, anodizing of zinc foil was investigated in NaOH and oxalic acid electrolytes under the influence of different concentrations of the electrolyte, while temperature and voltage were kept constant. Anodized zinc plates were characterized using scanning electron microscope (SEM), UV-Vis diffuse reflectance spectroscopy (DRS UV-Vis), and X-ray diffraction (XRD) analysis. Characterization of anodized Zn plates using SEM showed that their morphology was significantly influenced by the type and concentration of anodizing electrolyte. XRD analysis indicated that the ZnO thin films were of hexagonal wurtzite structures. From contact angle measurements, it has been observed that the contact angle of anodized film is higher than that of pure zinc foil. Antibacterial results suggest that the parent zinc foil did not show the antibiotic activity, but the anodized zinc oxide is effective both toward Gram-positive bacteria and Gramnegative bacteria.

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Section: Antibacterial Activitymentioning

confidence: 99%

Antibacterial activity of ZnO films prepared by anodizing

2016

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“…). 12,13 These peaks appear in the patterns of alkaline ion exchange composites. After the ion exchange, the original d spacing in the montmorillonite clay decreased to 1.29 nm for 3 min.…”

Section: Bentonite-fe + O 2 → Bentonite-fe Y O X (3)mentioning

confidence: 99%

“…Recently, a number of studies appear in the literature on the application of alkaline ion exchanged clays to prepare antibacterial composites. 12,13 In alkaline ion exchange method, iron salt is mixed with bentonite and heated at around the melting point of iron salt. In this study, for the first time, bentonite/ iron oxide composites were prepared by alkaline ion exchanged method used for decolourisation of soybean oil.…”

Section: Introductionmentioning

confidence: 99%

Soybean Oil Bleaching by Adsorption onto Bentonite/Iron Oxide Nanocomposites

Ghorbanpour¹

2018

JPS

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The bleaching process of soybean oil using commercial bentonite and bentonite/iron oxide composites has been studied. X-ray diffraction (XRD), Brunauer-Emmett-Teller (BET) surface area measurement and scanning electron microscopy (SEM) were used to characterise the composites generated. SEM results show that the porosity of bentonite after alkaline ion exchange process can be enhanced by the opening of the bentonite's flakes. BET shows that the flakes' structure was more opened, and the porosity was increased from 179.58 m 2 g-1 for bentonite to 202 m 2 g-1 for 3 min ion exchanged sample. Changes in basal reflection in XRD peak validated the presence of iron oxide particles. The experimental results indicate that composite prepared for 1 min showed the same efficiency in bleaching crude soybean oil with the bentonite. The greatest reduction in bleaching capacity in soybean oil was achieved using the composite prepared for 3 min. The highest transparency, 1.5-fold in red and 1.25-fold in yellow greater than that of neutralised oil, was obtained with the alkaline ion exchange composite prepared for 3 min. Hence, this process gives a good adsorbent with better bleaching properties than commercial bentonite.

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“…To attribute antibacterial properties to an inert material, it is necessary to treat it with metallic ions with bacteriostatic nature, such as silver, 1-4 copper 4-8 and zinc. 1,9,10 Among them, copper is one of the most promising because of its biocompatibility and high affinity for the pathogenic microorganisms.…”

Section: Introductionmentioning

confidence: 99%

“…3 These metals/clay composites usually prepared by ion exchange of positively charged metal ions and alkali ions present in a surface layer of clay or by synthesis of nanoparticles and immobilisation them on the clay by various techniques such as ion exchange processes and sol-gel. 1,5,6,8,9,16 Nevertheless, many of these techniques typically entail multiple steps combined with ultrasonication and stirring that take long hours or even days followed by chemical reduction of the precursor metal salts.…”

Section: Introductionmentioning

confidence: 99%