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All Journal ASEAN Journal for Science and Engineering in Materials
Okon, Idongesit Edem
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Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering

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Photocatalytic Removal of Toxic Metals from Tannery Wastewater using Green Synthesized Zinc Oxide Nanoparticles Kpega, Tyosue Christopher; Habila, James Dama; Okon, Idongesit Edem; Ekwumemgbo, Patricia Adama
ASEAN Journal for Science and Engineering in Materials Vol 5, No 1 (2026): (ONLINE FIRST) AJSEM: Volume 5, Issue 1, March 2026
Publisher : Bumi Publikasi Nusantara

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Water is an important natural resource and is vital to all living organisms. However, increased industrialization and urbanization have led to water pollution. This research aimed at removing some toxic metals from tannery wastewater using already green synthesized zinc oxide nanoparticles (ZnO-NPs). The treatment method used was photocatalytic degradation. The concentrations of Cr, Cu, and Pb in the wastewater were found to be above the standard recommended by WHO and the National Environmental Standards Regulatory and Enforcement Agency (NESREA) while those of Ni, Mn, and Co were within the acceptable limit. The photocatalytic degradation using the ZnO-NPs was effective in the treatment of the metals: Cr, Co, Cu, Mn, Ni, and Pb as their concentration in the treated tannery wastewater were significantly lower than that in the untreated wastewater except for Mn. Based on the results, photocatalytic degradation using green synthesized ZnO-NPs has proven to be a viable method for the degradation of tannery wastewater.
In-vitro Analysis of Antimicrobial Activities of Green Synthesized Silver Oxide Nanoparticles on some Microorganisms found in Open Wound Abdulmaleek, Rahama Orahachi; Okon, Idongesit Edem; Ndukwe, George Iloegbu; Adamma, Patricia; Ekwumemgbo, E.
ASEAN Journal for Science and Engineering in Materials Vol 4, No 1 (2025): AJSEM: Volume 4, Issue 1, March 2025
Publisher : Bumi Publikasi Nusantara

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The main barrier to open wound healing is biofilm formation on the wound by a group of microbes encapsulated in a self-produced extracellular polymeric substance with high resistance to many conventional antimicrobial therapies. There is a need for unique anti-biofilm strategies and antimicrobial agents. This study aimed to investigate the antimicrobial activities of green synthesized silver oxide nanoparticles (Ag2O-NPs) on some bacteria (Staphylococcus aureus, Bacillus subtilis, Escherichia coli, and Pseudomonas aeroginosa) and fungi (Candida albican) commonly found in open wound (In-vitro). Ag2O-NPs exhibited considerable zone of inhibition (ZOI) against the test microorganisms. The minimum inhibitory concentration of silver nanoparticles against the bacteria was 3.75 and 15 mg/mL against the bacteria and fungi, respectively. The minimum bactericidal concentration was 7.50 and 15.00 mg/mL for bacteria and fungi, respectively. Green synthesized Ag2O-NPs exhibited some antimicrobial activities, which can aid in wound healing.
In-vitro Analysis of Antimicrobial Activities of Green Synthesized Silver Oxide Nanoparticles on some Microorganisms Found in Open Wound Abdulmaleek, Rahama Orahachi; Okon, Idongesit Edem; Ndukwe, George Iloegbu; Adamma, Patricia; Ekwumemgbo, E.
ASEAN Journal for Science and Engineering in Materials Vol 4, No 2 (2025): (ONLINE FIRST) AJSEM: Volume 4, Issue 2, September 2025
Publisher : Bumi Publikasi Nusantara

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The main obstacle to open wound healing is the formation of biofilms that are resistant to antimicrobial therapy. The use of silver nanoparticles, with their healing properties and broad antimicrobial effects, offers a new solution for wound infection control. This study aimed to investigate the antimicrobial activities of green-synthesized silver oxide nanoparticles (Ag2O-NPs) against bacteria (Staphylococcus aureus, Bacillus subtilis, Escherichia coli, and Pseudomonas aeruginosa) and fungi (Candida albicans) commonly found in open wounds in vitro. Ag2O-NPs showed significant zones of inhibition against the tested microorganisms. The minimum inhibitory concentration (MIC) values for bacteria were 3.75 mg/cm³ and 15 mg/cm³ for fungi, while the minimum bactericidal concentration (MBC) was 7.50 mg/cm³ for bacteria and 15.00 mg/cm³ for fungi. The results indicate that green-synthesized Ag2O-NPs possess antimicrobial activity, which could aid in wound healing.
Regression Study on the Impact of Vehicular Emission Pollutants on Ozone Level: Chemical and Material Perspectives Ekwumemgbo, Patricia Adamma; Okon, Idongesit Edem
ASEAN Journal for Science and Engineering in Materials Vol 2, No 2 (2023): AJSEM: Volume 2, Issue 2, September 2023
Publisher : Bumi Publikasi Nusantara

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This study verified the impact of vehicular emission pollutants and meteorological factors on the variability of ground-level ozone in Port Harcourt, Nigeria using multiple linear regression (MLR) analysis (p=0.05). Data were collected at traffic hot spots over twelve calendar months (December 2017 and November 2018). The explanatory variables were precursor pollutants (NO2, CO, and VOCs) and meteorological factors (temperature, relative humidity, and wind speed). Data collected were subjected to correlation analyses, and O3 concentrations showed a significant positive correlation with NO2, CO, VOCs, and traffic density (p= 0.05). O3 levels also correlated positively with temperature and negatively with wind speed and relative humidity across traffic periods. Three Models: Model 1, Model 2, and Model 3 were generated from MLR analyses for the estimation of O3 variation in the morning peak traffic period, off-peak traffic period, and evening peak traffic period respectively. Validation of performance for each Model was achieved using performance statistics including adjusted R2, mean absolute error (MAE), mean biased error (MBE), mean square error (MSE), and root mean square error (RMSE).
Co-Authors Abdulmaleek, Rahama Orahachi Adamma, Patricia Ekwumemgbo, E. Ekwumemgbo, Patricia Adama Ekwumemgbo, Patricia Adamma Habila, James Dama Kpega, Tyosue Christopher Ndukwe, George Iloegbu