Browsing by Author "Okello, Veronica A."
Now showing items 1-11 of 11
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Biofunctionalized poly (amic) acid membranes for absolute disinfection of drinking water
Yazgan, Idris; Du, Nian; Congdon, Robert; Okello, Veronica A.; Sadik, Omowunmi A. (Elsevier, 2014-12)The integration of biological building-blocks with synthetic nanomaterials may permit unprecedented ability to detect, disinfect and completely remove pathogens in water. We hereby described the synthesis of biodegradable, ... -
Capture, isolation and electrochemical detection of industrially-relevant engineered aerosol nanoparticles using poly (amic) acid, phase-inverted, nano-membranes
Okello, Veronica A.; Gass, Samuel; Pyrgiotakis, Georgios (Elsevier, 2014-08-30)Workplace exposure to engineered nanoparticles (ENPs) is a potential health and environmental hazard. This paper reports a novel approach for tracking hazardous airborne ENPs by applying online poly (amic) acid membranes ... -
Catalytic Reduction of Hexavalent Chromium using Nanostructured Polyamic Acid
Omole, Marcells A.; Okello, Veronica A.; Lee, Vincent; Zhou, Lisa; Sadik, Omowunmi A. (American Chemical Society, 2014)This paper provides a survey of conventional and emerging techniques that are available for characterizing engineered nanoparticles in complex matrices. Techniques that were considered include microscopy (TEM, SEM, HRTEM, ... -
Environmental Applications of Poly(amic acid)-based Nanomaterials
Okello, Veronica A.; Du, Nian; Deng, Boling; Sadik, Omowunmi A. (Electronic Supplementary Material (ESI) for Journal of Environmental Monitoring, 2011) -
Green Remediation of Carbamazepine from Water Using Novel Magnetic Iron Modified Carbonized Baggasse: Kinetics, Equilibrium and Mechanistic Studies
Okello, Veronica A.; Kimosop, Selly J.; Getenga, Zakari M.; Orata, Francis; Shikuku, Victor O. (SCIENCE DOMAIN, 2017-03-15)Baggasse derived biochar magnetically modified with iron (α-Fe2O3-CBG) was fabricated, characterized and applied as a low-cost adsorbent for the removal of carbamazepine (CBZ), a pharmaceutically active compound which ... -
A New Substrate for Alkaline Phosphatase Based on Quercetin Pentaphosphate
Mwilu, Samuel K; Okello, Veronica A.; Osonga, Francis; Miller, Seth; Omowunmi, A. Sadik (2014-05-22)We describe the characterization and application of quercetin pentaphosphate (QPP), a new fluorimetric substrate for the detection of alkaline phosphatase (ALP) activity. QPP exhibits major absorbance peaks at 260/ 410 ... -
Photometric sensing of heavy metal ions using a naphthoquinodimethyl-bis-thioamide dye: Selectivity & photophysics of the metal organic complexes
Maharjana, Samjhana; JuYun, Young; Okello, Veronica A.; Wiederrecht, Gary P.; Gosztola, David J.; Jean-LucAyitou, V. (Elsevier, 2022)As Mother Nature is experiencing catastrophic environmental pollutions from both natural sources and anthropogenic activities, many scientists have been working around the clock to develop environmentally benign and ... -
Reactivity, Characterization of Reaction Products and Immobilization of Lead in Water and Sediments using Quercetin Pentaphosphate
Okello, Veronica A.; Osonga, Francis J.; Knipfing, Michael T.; Bushlyar, Victor; Sadik, Omowunmi A. (RSC, 2016)Lead is currently ranked the number one heavy metal pollutant with maximum contaminant level (MCL) of 0.015 mg/L. The use of organicsolvent free methods to immobilize lead from the environment is attracting the attention ... -
Reduction and Degradation of Paraoxon in Water Using Zero-Valent Iron Nanoparticles
Okello, Veronica A.; K’Owino, Isaac O.; Masika, Kevin; Shikuku, Victor O. (MDPI, 2022-08-02)Paraoxon is an emerging organophosphate pollutant that is commonly used as a pesticide and a drug, hence increasing the risk of contamination of water supplies. Its intensive use for vector control has led to pollutions ... -
Reduction of Hexavalent Chromium Using Naturally-Derived Flavonoids
Okello, Veronica A.; Mwilu, Samuel; Noah, Naumih; Zhou, Ailing; Chong, Jane; Knipfing, Michael T.; Doetschman, David; Sadik, Omowunmi A. (American Chemical Society, 2012)Quercetin is a naturally occurring flavonoid that is known to form complexes with metals; a process that reduces the environmental availability of toxic metals such as chromium. We hereby report the first evidence of the ... -
Synthesis of mesoporous akaganeite functionalized maize cob biochar for adsorptive abatement of carbamazepine: Kinetics, isotherms, and thermodynamics
Selly, Jemutai Kimosop; Okello, Veronica A.; Shikuku, Victor O.; Orata, Francis; Getenga, Zachary M. (Elsevier, 2022-09-01)In this work, akaganeite (β-FeO(OH)) impregnated maize cob biochar (Fe-MCB) was prepared by direct hydrolysis, and its adsorptive potential was tested against aqueous solutions of carbamazepine (CBZ), an emerging contaminant. ...