Browsing by Author "Orata, Francis"
Now showing items 21-40 of 42
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Fish Tissue Bio-concentration and Interspecies Uptake of Heavy Metals from Waste Water Lagoons
Orata, Francis; Birgen, Faith (Journal of Pollution Effects & Control, 2016-01)Fish products may be important vectors of human exposure to heavy metals. However the understanding of how heavy metals bioconcentrate in different fish species (sp.) through contaminated environments such as wastewater ... -
Green Remediation of Carbamazepine from Water Using Novel Magnetic Iron Modified Carbonized Baggasse: Kinetics, Equilibrium and Mechanistic Studies
Kimosop, Selly Jemutai-; Okello, Veronica A.; Orata, Francis; Getenga, Zachary M.; Shikuku, Victor O. (Chemical Science International Journal, 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 has ... -
High seroprevalence of Immunoglobulin G (IgG) and IgM antibodies to SARS-CoV-2 in asymptomatic and symptomatic individuals amidst vaccination roll-out in western Kenya
Awandu, Shehu Shagari; Ochieng, Alfred Ochieng; Onyango, Benson; Magwanga, Richard Odongo; Were, Pamela; Ochung, Angeline Atieno; Okumu, Fredrick; Oloo, Marceline Adhiambo; Katieno, Jim Seth; Lidechi, Shirley; Ogutu, Fredrick; Awuor, Dorothy; Kirungu, Joy Nyangasi; Orata, Francis; Achieng, Justine; Oure, Bonface; Nyunja, Regina; Muok, Eric M. O.; Munga, Stephen; Estambale, Benson (PLOS ONE, 2022-12-22)The population’s antibody response is a key factor in comprehending SARS-CoV-2 epidemiology. This is especially important in African settings where COVID-19 impact, and vaccination rates are relatively low. This study aimed ... -
The Influence of Filter Mud Compost and Tithonia diversifolia Leaves on the Dissipation of Diuron in Soils within the Nzoia River Drainage Basin, Kenya
Kimosop, Selly Jemutai; Orata, Francis; Getenga, Zachary (Bulletin of Environmental Contamination and Toxicology, 2012-05-22)The aim of the study was to evaluate the environmental impact of filter mud compost and Tithonia diversifoila amendments on the dissipation of diuron in sugarcane cultivated soils. Filter mud compost is the by-product of ... -
Insights on adsorption of carbamazepine onto iron oxide modified diatomaceous earth: Kinetics, isotherms, thermodynamics, and mechanisms
Kimosop, SellyJemutai; Orata, Francis; Shikukub, Victor O.; Okelloc, Veronica A.; Getenga, Zachary M. (Environmental Research, 2020-01)To ameliorate adsorbent recovery by an external magnetic field, naturally occurring diatomaceous earth (DE) was modified with iron-oxide, characterized and applied for adsorption of carbamazepine (CBZ) from synthetic ... -
Occurrence and Distribution of Per- and Polyfluoroalkyl Substances from Multi-Industry Sources to Water, Sediments and Plants along Nairobi River Basin, Kenya
Chirikona, Flora; Quinete, Natalia; Gonzalez, Jesleen; Mutua, Gershom; Kimosop, Selly; Orata, Francis (Environmental Research and Public Health, 2022-07-23)Per- and polyfluoroalkyl substances (PFAS) are ever-present pollutants in the environment. They are persistent and bio-accumulative with deleterious health effects on biota. This study assesses the levels of PFAS in ... -
Occurrence and Distribution of Per- and Polyfluoroalkyl Substances from Multi-Industry Sources to Water, Sediments and Plants along Nairobi River Basin, Kenya
Chirikona, Flora; Quinete, Natalia; Gonzalez, Jesleen; Mutua, Gershom; Kimosop, Selly; Orata, Francis (Environmental Research and public health, 2022-07-23)Per- and polyfluoroalkyl substances (PFAS) are ever-present pollutants in the environment. They are persistent and bio-accumulative with deleterious health effects on biota. This study assesses the levels of PFAS in ... -
Occurrence and Distribution of Per- and Polyfluoroalkyl Substances from Multi-Industry Sources to Water, Sediments and Plants along Nairobi River Basin, Kenya
Chirikona, Flora; Quinete, Natalia; Gonzalez, Jesleen; Mutua, Gershom; Kimosop, Selly; Orata, Francis (International Journal of Environmental Research and public health, 2022-07-23)Per- and polyfluoroalkyl substances (PFAS) are ever-present pollutants in the environment. They are persistent and bio-accumulative with deleterious health effects on biota. This study assesses the levels of PFAS in ... -
Per- and polyfluoroalkyl substances in selected sewage sludge in Nigeria
Sindiku, Omotayo; Orata, Francis; Weber, Roland; Osibanjo, Oladele (Elsavier, 2013-05-03)Levels of seven major perfluoroalkyl carboxylates (PFCAs) and three perfluoroalkyl sulfonates (PFSAs) were analyzed for the first time in sludge from wastewater treatment plants from Nigeria. Measurements were performed ... -
Per- and polyfluoroalkyl substances in selected sewage sludge in Nigeria.
Sindiku, Omotayo; Orata, Francis; Weber, Roland; Osibanjo, Oladele (Chemosphere, 2013-07-03)Levels of seven major perfluoroalkyl carboxylates (PFCAs) and three perfluoroalkyl sulfonates (PFSAs) were analyzed for the first time in sludge from wastewater treatment plants from Nigeria. Measurements were performed ... -
Perfluorinated Compounds Distribution and Source Identification in Sediments of Lake Victoria Gulf Basin
Orata, Francis; Maes, Anke; Werres, Friedrich; Wilken, Rolf Dieter (Soil and Sediment Contamination, 2011-03-03)Perfluorooctanoic acid and perfluorooctane sulfonate were determined in the sediments from Winam Gulf, which is in the Kenyan side of Lake Victoria and in its source rivers. The sources of perfluorinated compounds within ... -
Perfluoroalkyl acids in selected wastewater treatment plants and their discharge load within the Lake Victoria basin in Kenya
Chirikona, Florah; Filipovic, Marko; Ooko, Seline; Orata, Francis (Environmental Monitoring and Assessment, 2015-04-11)A major ecological challenge facing Lake Victoria basin is the influx of chemical contaminants from domestic, hospital, and industrial effluents. Determined levels of perfluoroalkyl acids (PFAAs) in wastewater and sludge ... -
Residue levels and discharge loads of antibiotics in wastewater treatment plants ( WWTPs), hospital lagoons, and rivers within Lake Victoria Basin, Kenya.
Kimosop, Selly; Getenga, Zachary Moranga; Orata, Francis; Okello, Veronica; Cheruiyot, Jemoi (Environmental Monitoring and Assessment, 2016-08)The detection of antibiotics in water systems has instigated great environmental concern due to the toxicological effects associated with these compounds. Their discharge into the environment results from the ubiquity of ... -
Response surface methodology directed modeling of the biosorption of progesterone onto acid activated Moringa oleifera seed biomass: Parameters and mechanisms
Emily, Ngeno; Roselyn, Ongulu; Victor, Shikuku; Ssentongo, Deo; Otieno, Benton; Ssebugere, Patrick; Orata, Francis (Science Direct, 2024-05-27)In this study, chemically activated fat-free powdered Moringa oleifera seed biomass (MOSB) was synthesized, characterized, and utilized as a cost-effective biosorbent for the abstraction of progesterone (PGT) hormone from ... -
Role of pore chemistry and topology in the heavy metal sorption by zeolites: From molecular simulation to machine learnin
Wanyonyi, Fred Sifuna; Fidelisb, Timothy Tizhe; Mutua, Gershom Kyalo; Orata, Francis; Pemberec, Anthony M.S (Computational Materials Science, 2021-04-23)Zeolite frameworks can provide pores that enable selective heavy metals sorption, making these materials promising for energy-efficient heavy metals capture. In the present study, the adsorption of hazardous heavy metal ... -
Role of pore chemistry and topology in the heavy metal sorption by zeolites: From molecular simulation to machine learning.
Wanyonyi, Fred Sifuna; Fidelis, Timothy Tizhe; Mutua, Gershom Kyalo; Orata, Francis; Pembere, Anthony M.S. (Science Direct, 2021-07)Zeolite frameworks can provide pores that enable selective heavy metals sorption, making these materials promising for energy-efficient heavy metals capture. In the present study, the adsorption of hazardous heavy metal ... -
SARS-CoV-2 Detection in Fecal Samples in Sym-asymptotic Patients with Typical Findings of COVID-19 on Ag-RDT and SARS-CoV-2 RT-PCR Tests
Magwanga, Richard Odongo; Onyang, Benson; Ochieng, Alfred; Awandu, Shehu Shagari; Were, Pamella; Kirungu, Joy Nyangasi; Oloo, Marceline Adhiambo; Muok, Erick; Munga, Stephen; Ogutu, Fredrick; Orwa, Angeline; Okumu, Fredrick; Onyango, Clayton; Awuor, Dorothy; Orata, Francis; Mideg, Justine Ochieng’-; Oure, Bonface; Nyunja, Regina; Ade, Fredrick; Indechi, Shirley; Okuto, Erick; Estambale, Benson (Europe PMC, 2022-09-28)Coronavirus is a disease caused by a severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) which emerged as a global pandemic in 2019 from Wuhan, China. Since its emergence, it has caused immense suffering to human ... -
Simulation guided prediction of zeolites for the sorption of selected anions from water: Machine learning predictors for enhanced loading
Wanyonyi, Fred Sifuna; Fidelis, Timothy Tizhe; Louis, Hitler; Mutua, Gershom Kyalo; Orata, Francis; Rhyman, Lydia; Ramasami, Ponnadurai; Pembere, Anthony M.S. (Journal of Molecular Liquids, 2022-06-01)The development of highly efficient adsorbents, especially those that can harvest anions like CrO42−, AsO43−, NO3– and PO43−, is one of the principal challenges in the water treatment field. The current study utilized a ... -
Simulation guided prediction of zeolites for the sorption of selected anions from water: Machine learning predictors for enhanced loading
Wanyonyi, FredSifuna; Tizhe Fidelis, Timothy; Louis, Hitler; Mutua, Gershom Kyalo; Orata, Francis; Rhyman, Lydia; Ramasami, Ponnadurai; Pembere, Anthony M.S. (Journal of Molecular Liquids, 2022-06-01)The development of highly efficient adsorbents, especially those that can harvest anions like CrO42−, AsO43−, NO3– and PO43−, is one of the principal challenges in the water treatment field. The current study utilized a ... -
Synthesis of mesoporous akaganeite functionalized maize cob biochar for adsorptive abatement of carbamazepine: Kinetics, isotherms, and thermodynamics
Kimosop, SellyJemutai-; Okello, Veronica A.; Shikuku, Victor O.; Orata, Francis; Getenga, Zachary M. (Cleaner Materials journal homepage: www.journals.elsevier.com/cleaner-materials https://doi.org/10.1016/j.clema.2022.100104 Received 16 March 2022; Received in revised form 6 June 2022; Accepted 12 June 2022, 2022-06-17)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. ...