Browsing by Author "Orata, Francis"
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Adsorption of Caffeine and Ciprofloxacin onto Pyrolitically Derived Water Hyacinth Biochar: Isothermal, Kinetic and Thermodynamic Studies
Orata, Francis; Lilechi, Danstone Baraza; Kimosop, Sally (2006-09)In this work, the adsorptive features of water hyacinth (Eichhornia crassipes) derived biochar for sequestration of ciprofloxacin and caffeine from aqueous solution is reported. The isothermal behaviour, adsorption kinetics, ... -
Adsorption of Caffeine and Ciprofloxacin onto Pyrolitically Derived Water Hyacinth Biochar: Isothermal, Kinetic and Thermodynamic Studies.
Ngeno, Emily Chelangat; Orata, Francis; Baraza, Danstone Lilechi; Shikuku, Victor; Kimosop, Selly (Journal of Chemistry and Chemical Engineering, 2016-09)Adsorption of Caffeine and Ciprofloxacin onto Pyrolitically Derived Water Hyacinth Biochar: Isothermal, Kinetic and Thermodynamic Studies Full-Text PDFDownload XML 10 Views DOI:10.17265/1934-7375/2016.04.006 Author(s) Emily ... -
Analysis of Spatial and Temporal Levels of Heavy Metals in Water, Sediments and Fish in Sosiani River
Shieunda, Ogara Rose; Neyole, Edward; Omuterema, Stanley; Orata, Francis (International Journal of Environmental Bioremediation & Biodegradation, 2019-10-09)The objective of the study was to examine spatial and temporal levels of heavy metals in water, sediments and fish in Sosiani River. This study was an experimental design approach in which a scientific analysis was done ... -
Assessment of Available Phosphates and Nitrates Levels in Water and Sediments of River Isiukhu, Kenya
Oremo, Jane; Orata, Francis; Owino, Joseph; Shivoga, William (Applied Ecology and Environmental Sciences, 2, 2020-05-05)Surface water contamination has become one of the main environmental issues of concern and a challenge to the world population, especially in the developing world, that face potable or usable water security. In this study ... -
Assessment of Environmental Sources, Levels and Distribution of Polycyclic Aromatic Hydrocarbons within Nzoia Catchment Area in Kenya
Shitandayi, Agripina; Orata, Francis; Lisouza, Fred (Journal of Environmental Protection, 2019-06)Continuous concerns about Polycyclic Aromatic Hydrocarbons (PAHs) presence in the environment have raised concern because of their toxic effects to various organisms. Sugarcane farming and cane processing industries are ... -
Assessment of heavy metals in benthic macroinvertebrates, water and sediments in River Isiukhu, Kenya
Oremo, Jane; Orata, Francis; Owino, Joseph; Shivoga, William (Environmental Monitoring and Assessment, 2019-10-16)A major ecological challenge facing freshwater resources such as rivers is the influx of chemical contaminants from anthropogenic sources. A report on the levels of heavy metals, namely Zn, Cu, Cr, Cd and Pb in benthic ... -
Assessment of heavy metals in benthic macroinvertebrates, water and sediments in River Isiukhu, Kenya
Oremo, Jane; Orata, Francis; Owino, Joseph; Shivoga, William (Environmental Monitoring and Assessme, 2019-10-16)A major ecological challenge facing freshwater resources such as rivers is the influx of chemical contaminants from anthropogenic sources. A report on the levels of heavy metals, namely Zn, Cu, Cr, Cd and Pb in benthic ... -
Assessment of Public Health Risks of Heavy Metals Pollution in River Sosiani Catchment
Shieund, Ogara Rose; Neyole, Edward; Omuterema, Stanley; Orata, Francis (American Journal of Environmental Protection, 2019-10-09)The objective of the study was to assess public health risks of heavy metals pollution in river Sosiani Catchment. This study was a multiple design approach whereby both experimental and socio-economic survey was done ... -
Bioaccumulation of perfluoroalkyl acids in dairy cows in a naturally contaminated environment.
Vestergren, Robin; Orata, Francis; Berger, Urs; Cousins, Ian T. (Environmental Science and Pollution Research, 2013-05-04)Beef and dairy products may be important vectors of human exposure to perfluoroalkyl acids (PFAAs), but the understanding of how PFAAs are accumulated and transferred through agricultural food chains is very limited. Here, ... -
Biodegradation of carbofuran in soils within Nzoia River Basin, Kenya
Onunga, Daniel; Kowino, Isaac O; Ngigi, Anastasiah; Osogo, Aggrey; Orata, Francis; Getenga, Zachary; Were, Hassan (Journal of Environmental Science and Health, Part B, 2015-04)Carbofuran (2,3-dihydro-2,2-dimethylbenzofuran-7-yl methylcarbamate) has been used within the Nzoia River Basin (NRB), especially in Bunyala Rice Irrigation Schemes, in Kenya for the control of pests. In this study, the ... -
Caffeine and Ciprofloxacin Adsorption from Water onto Clinoptilolite: Linear Isotherms, Kinetics, Thermodynamic and Mechanistic Studies
Ngeno, Emily C.; Shikuku, Victor O.; Orata, Francis; Baraza, Lilechi D.; Kimosop, Selly J. (South African Journal of Chemistry, 2019-01)In this study, clinoptilolite was used to sequester ciprofloxacin (CIP) and caffeine (CAF), two emergent contaminants, from aqueous solution using batch equilibration method and the effects of contact time, pH, initial ... -
Chemicals of Emerging Concern in Surface and Wastewater: A Perspective of Their Fate Within the Lake Victoria Catchment Area of KenyaAbstract
Orata, Francis (2020-01)Rapid technological advancement in the pharmaceuticals and chemical industry has led to synthesis of compounds used for health/personal care and industrial products in large amounts. These chemicals of emerging concern ... -
Comparative studies in electrochemical degradation of sulfamethoxazole and diclofenac in water by using various electrodes and phosphate and sulfate supporting electrolytes
Sifuna, Fred W.; Orata, Francis; Okello, Veronica; Kimosop, Selly Jemutai (Journal of Environmental Science and Health, Part A, 2016-06-23)In this study, the electro-oxidation capacities of Na2SO4 and potassium phosphate buffer supporting electrolytes were tested and compared for destruction of the sulfamethoxazole (SMX) and diclofenac (DCF) on platinum (Pt) ... -
Computational screening of zeolites for the adsorption of selected pharmaceutical pollutants
Wanyonyi, Fred Sifuna; Pembere, Anthony; Mutua, Gershom Kyalo; Orata, Francis; Louis, Hitler (SN Applied Sciences, 2020-10-27)Molecular simulations have been used as a screening tool to identify promising zeolites for the removal of selected pharmaceutical pollutants. 40 zeolites with different structural and chemical configurations were studied. ... -
Conventional Wastewater Treatment Plants as a Discharge and Source Point for Biota Exposure to Micro-pollutants
Orata, Francis (Tylor and Francis, 2018-05-22)This chapter provides information on conventional wastewater treatment plants (WWTPs) as a discharge point, through which micro-pollutants (MPs) get into aquatic and terrestrial biota from various points of origin and ... -
Derivatization Reactions and Reagents for Gas Chromatography Analysis
Orata, Francis (Advanced Gas Chromatography, 2012-03-21)Derivatization reactions are meant to transform an analyte for detectability in Gas Chromatography (GC) or other instrumental analytical methods. Derivatization in GC analysis can be defined as a procedural technique that ... -
Derivatization Reactions and Reagents for Gas Chromatography Analysis.
Orata, Francis (Advanced Gas Chromatography - Progress in Agricultural, Biomedical and Industrial Applications, 2012-03)Derivatization reactions are meant to transform an analyte for detectability in Gas Chromatography (GC) or other instrumental analytical methods. Derivatization in GC analysis can be defined as a procedural technique that ... -
Endocrine disrupting chemicals in wastewater treatment plants in Kenya, East Africa: Concentrations, removal efficiency, mass loading rates and ecological impacts
Ngeno, Emily; Ongulu, Roselyn; Orata, Francis; Matovu, Henry; Shikuku, Victor; Onchiri, Richard; Mayaka, Abel; Majanga, Eunice; Getenga, Zachary; Gichumbi, Joel (Environmental Research, 2023-09-20)This study investigated the levels, mass loadings, removal efficiency, and associated ecotoxicological risks of selected endocrine disrupting chemicals (EDCs), namely, dibutylphthalate (DBP), diethylhexylphthalate (DEHP), ... -
Endocrine disrupting chemicals in wastewater treatment plants in Kenya, East Africa: Concentrations, removal efficiency, mass loading rates and ecological impacts
Ngeno, Emily; Ongulu, Roselyn; Orata, Francis; Matovu, Henry; Shikuku, Victor; Onchiri, Richard; Mayaka, Abel; Majanga, Eunice; Getenga, Zachary; Gichumbi, Joel (Environmental Research, 2023-11-01)This study investigated the levels, mass loadings, removal efficiency, and associated ecotoxicological risks of selected endocrine disrupting chemicals (EDCs), namely, dibutylphthalate (DBP), diethylhexylphthalate (DEHP), ... -
Fish Tissue Bio-concentration and Interspecies Uptake of Heavy Metals from Waste Water Lagoons
Orata, Francis (MMUST, 2016-03)