Role of pH on zinc oxide nanoparticles synthesis using gum arabic for sustainable and safe antibacterial agent

Norlin Pauzi, . and Norashikin Mat Zain, . and Nurul Amira Ahmad Yusof, . Role of pH on zinc oxide nanoparticles synthesis using gum arabic for sustainable and safe antibacterial agent. pp. 11-20. ISSN 1823-8556

In this study ZnO nanoparticles were produced via the precipitating method supplemented by the microwave heating method. Zinc nitrate sodium hydroxide and gum arabic were used as zinc salt reducing agent and stabilizing agent respectively. The objective of this work is to investigate the pH effect ranging from 5 to 12 on the ZnO nanoparticle size. By using Dynamic Light Scattering (DLS) method the average nanoparticle size ranged from 200 nm to 350 nm was obtained. UV-vis absorption spectrum was found in the range of 340 nm “ 350 nm indicating the absorption peak of ZnO nanoparticles. FTIR spectra showed peaks range from 412 to 466 cm which indicating standard of Zn“O stretching. The presence of (100) (002) and (101) planes were apparent in the XRD result indicating the crystalline phase of ZnO nanoparticles. At the pH 7 zinc nitrate hydroxide hydrate was produced which was similar to ZnO nanoparticle that is in white solution. pH 10 was required to attain the pure phase of ZnO nanoparticles. Smaller nanoparticles synthesized at pH 10 show larger antibacterial effects at both Gram-positive bacterium Staphylococcus aureus and Gram-negative bacterium Escherichia coli.

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Abstract

In this study ZnO nanoparticles were produced via the precipitating method supplemented by the microwave heating method. Zinc nitrate sodium hydroxide and gum arabic were used as zinc salt reducing agent and stabilizing agent respectively. The objective of this work is to investigate the pH effect ranging from 5 to 12 on the ZnO nanoparticle size. By using Dynamic Light Scattering (DLS) method the average nanoparticle size ranged from 200 nm to 350 nm was obtained. UV-vis absorption spectrum was found in the range of 340 nm “ 350 nm indicating the absorption peak of ZnO nanoparticles. FTIR spectra showed peaks range from 412 to 466 cm which indicating standard of Zn“O stretching. The presence of (100) (002) and (101) planes were apparent in the XRD result indicating the crystalline phase of ZnO nanoparticles. At the pH 7 zinc nitrate hydroxide hydrate was produced which was similar to ZnO nanoparticle that is in white solution. pH 10 was required to attain the pure phase of ZnO nanoparticles. Smaller nanoparticles synthesized at pH 10 show larger antibacterial effects at both Gram-positive bacterium Staphylococcus aureus and Gram-negative bacterium Escherichia coli.

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Item Type:	Article
AGROVOC Term:	Zinc
AGROVOC Term:	Oxides
AGROVOC Term:	Antibacterial agents
AGROVOC Term:	Gum arabic
AGROVOC Term:	Microwave treatment
AGROVOC Term:	Heating
AGROVOC Term:	Precipitation
AGROVOC Term:	Chemical reactions
AGROVOC Term:	Absorption
AGROVOC Term:	Spectroscopy
Depositing User:	Mr. AFANDI ABDUL MALEK
Last Modified:	24 Apr 2025 00:54
URI:	http://webagris.upm.edu.my/id/eprint/8106

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