SCHOOL OF SCIENCE: Recent submissions

Now showing items 1-20 of 30

Adsorption of nickel (II) from aqueous solutions with clay-supported nano-scale zero-valent iron synthesized from green tea extract

Tchakounte, Armand; Kede, Charles; Shikuku, Victor; Lenou, Idriss; Dika, Joseph (Elsevier Inc, 2024)

Nano zerovalent iron (nZVI) supported adsorbents have been reported as suitable candidates for adsorption of water contaminants. However, the role of and interplay between surface chemistry, functional group density and ...
Assessment of the status of selected heavy metals in water, sediments and a fish species (Oreochromis niloticus) of commercial value in Lake Nakuru with a focus on human health risks

Nantongo, Mary Florence; Edebe, Joseph; Otachi, Elick O.; Kipkemboi, Julius (Lake Reservoirs, 2024-03)

The present study presents selected water quality parameters and the levels of heavy metals in water, sediments and Nile tilapia (Oreochromis niloticus) of Lake Nakuru. Nine sediments and nine water samples, as well as 30 ...
Quantitation and correlation of selected nutrients in the soil, foliar, stem and root of edible weed, Talinum Paniculatum around University of KwaZulu-Natal, Pietermaritzburg, South Africa

Achieng, George O; Omondi, Reinner; Shikuku, Victor O.; Okowa, George M. (Research Square, 2024-01)

The use of wild edible herbs as leafy vegetables is notably prevalent in South Africa, where they are commonly prepared as potherbs alongside cornmeal or incorporated into side dishes. However, Talinum Paniculatum (T. ...
DFT+U investigation of electronic, optical, and thermoelectric properties of YAuX (X=Si or Ge or Sn) half-Heusler alloys

Wafula, Job W.; Manyali, George; Makhoka, John; Madallah, Yusuf; Soukaina, Bouhmaidi; Larbi, Setti (Elsevier, 2024-04)

Half-heusler alloys are fascinating thermoelectric materials because they have superior mechanical and transport properties. In this study, we used dft+u calculations and the Boltztrap equation to examine the electronic, ...
Assessment of the status of selected heavy metals in water, sediments and a fish species (Oreochromis niloticus) of commercial value in Lake Nakuru with a focus on human health risks

Nantongo, Mary Florence; Edebe, Joseph; Otachi, Elick O.; Kipkemboi, Julius (john Wiley, 2024-03)

The present study presents selected water quality parameters and the levels of heavy metals in water, sediments and Nile tilapia (Oreochromis niloticus) of Lake Nakuru. Nine sediments and nine water samples, as well as ...
Organochlorine pesticide residues in water, sediments and Nile tilapia (Oreochromis niloticus) of Lake Nakuru, Kenya and implications for its fishery

Mary Florence Nantongo, Florence Nantongo; Joseph, Edebe; Elick O. Otachi, O. Otachi; Julius, Kipkemboi (2022)

The present study was conducted to assess the levels of selected organochloride pesticide (OCP) residues in water, sediments and Nile tilapia, as well as the potential health risks to humans who consume the fish of Lake ...
Valorization of solid waste incinerator fly ash by geopolymer production for removal of anionic bromocresol green dye from water: Kinetics, isotherms and thermodynamics studies

Eugene, K. Owino; Victor, O. Shikuku; Wilfrida, N. Nyairo; Chrispin, O. Kowenje; Benton, Otieno (2023)

In this study, solid waste incinerator fly ash (SWI-FA) based geopolymer adsorbents were prepared by alkalination of hazardous SWI-FA and cured at different temperatures of 30 0C (GP30), 50 0C (GP50), 70 0C (GP70), and 90 ...
DFT investigation of structural, elastic, electronic, thermodynamic and optical properties of KCuZ (Z= Te, Se) solar absorbers

Madallah, Yusuf; Felix, O. Saouma; George, S. Manyali; Job, W. Wafula; Odanga, Huxley (Solid State Communications, 2023)

In this study, we have investigated the electronic , structural, elastic, optical and thermodynamic properties of the copper-based ternary semiconductors, that is, KCuZ (Z= Te, Se). The properties of these materials have ...
FT investigation of structural, elastic, electronic, thermodynamic and optical properties of KCuZ (Z= Te, Se) solar absorbers

Yusuf, Madallah; saouma, Felix O.; Manyali, George S.; WAFULA, Job W.; Huxley, Odanga (2022-09)

In this study, we have investigated the electronic , structural, elastic, optical and thermodynamic properties of the copper-based ternary semiconductors, that is, KCuZ (Z= Te, Se). The properties of these materials have ...
Low Born e ective Charges, High Covalency and Strong Optical Activity in X2+ 3 Bi3􀀀��N3􀀀�� (X=Ca,Sr,Ba) inverse-perovskites

Wakini, Jasmine; Songa, Carolyne; Chege, Stephen; .Saouma, Felix O; Wabululu, Elica; Nyawere, P.W.O; Odari, Victor; Sifuna, James; Manyali, George S. (2022-03)

We compute for the rst time a complete charge analysis (Bader and Born e ective) on X2+ 3 Bi3􀀀N3􀀀 (X=Ca,Sr,Ba). The crystals show a great electron sharing with little possibility of ferroelectricity. Inverse perovskites ...
Organochlorine pesticide residues in water, sediments and Nile tilapia (Oreochromis niloticus) of Lake Nakuru, Kenya and implications for its fishery

Nantongo, Mary Florence; Edebe, Joseph; . Otachi, Elick O; Kipkemboi, Julius (Lakes Reservoirs, 2022-12-19)

The present study was conducted to assess the levels of selected organochlorine pesticide (OCP) residues in water, sediments and Nile tilapia, as well as the potential health risks to humans who consume the fish of Lake ...
Elastic behavior, pressure-induced doping and superconducting transition temperature of GdBa2Cu3O7−x

Agora, JaredO; Otieno, Calford; Nyawere, PhilipWO; Manyali, George S (IOP, 2022-01-13)

Doping superconductors are known to vary the superconducting transition temperature TC depending on the degree of holes or electrons introduced in a system. In this study, we report how pressure-induced hole doping ...
A DFT study of mechanical properties of hcp rhenium

Manyali, George S. (2021-10-23)

In the present paper, hcp Re was investigated in terms of its structural, elastic, mechanical and thermodynamic properties using density-functional theory (DFT). The local density approximation was employed for the exchange ...
Low Born e ective Charges, High Covalency and Strong Optical Activity in X2+ 3 Bi3􀀀��N3􀀀�� (X=Ca,Sr,Ba) inverse-perovskites

Wakini, Jasmine; Songa, Carolyne; Chege, Stephen; Saouma, Felix O.; Wabululu, Elica; Nyawere, P.W.O; Odari, Victor; Sifuna, James; . Manyali, George S (2022-03-02)

We compute for the rst time a complete charge analysis (Bader and Born e ective) on X2+ 3 Bi3􀀀N3􀀀 (X=Ca,Sr,Ba). The crystals show a great electron sharing with little possibility of ferroelectricity. Inverse perovskites ...
Ab Initio Study of K3Cu3P2 Material for Photovoltaic Applications

Mbilo, Mwende; Manyali, George S.; Musembi, Robinson J. (PASET, 2022-03-25)

Search for e cient materials for application in the elds of optoelectronics and photovoltaics are active areas of research across the world. The potential of compounds such as K3Cu3P2 is not yet fully realized. Therefore, ...
Detection of Plasmodium Sporozoites and Blood-Meal Source in a Population of Anopheles Coustani Senso Lato in Kakamega County, Western Kenya

Busula, Annette O; Ayuya, Stephen; Kitungulu, Nicholas; Kipchoo, Mukabane; Webale, Mark Kilongosi; Omukunda, Elizabeth (ijird, 2022-01)

Re-emerging of malaria vectors in the highlands of Western Kenya pose a challenge to malaria eradication efforts. Anopheles coustanis.l is a sub-Saharan mosquito species implicated in transmission of malaria in many parts ...
Enhanced hexazinone degradation by a Bacillus species and Staphylococcus species isolated from pineapple and sugarcane cultivated soils in Kenya

Muendo, Boniface Mbithi; Shikuku, Victor Odhiambo; Getenga, Zachary Moranga; Lalah, Joseph Owuor; Wandiga, Shem Oyoo; Karau, Geoffrey Muriira; Rothballerf, Michael (KeAi, 2022-02-12)

In this work, hexazinone-degrading bacterial strains from Kenyan tropical soils with long termapplication history were isolated and identified. Non-sterile soils from sugarcane and pineapple cultivated fields with over 15 ...
Enhanced Performance of Hydrogen Peroxide Modified pozzolan-based Geopolymer for Abatement of Methylene blue from Aqueous Medium

Shikuku, Victor Odhiambo; Hermann, Dzoujo Tamaguelon; Sylvain, Tome; Tchuigwa, Jean T; Spieß, Alex; Janiak, Christoph; Etoh, Marie Annie; Dina, David (2021)

Pozzolan-based eco-adsorbents were synthesized by geopolymerization with addition of hydrogen peroxide (H2O2) with mass ratios 0% (GP0) and 1% (GP1) and the products used to sorb cationic methylene blue (MB) dye from ...
Adsorption-desorption and leaching behavior of diuron on selected Kenyan agricultural soils

Shikuku, Victor Odhiambo; Muendo, Boniface M.; Getenga, Zachary M.; Lalah, Joseph O.; Wandiga, Shem O.; Rothballer, Michael (Kenya Bureau of Standards, 2021)

In this work, the adsorption-desorption dynamics of diuron in three typical Kenyan agricultural soils, Nzoia (NZ), Thika (TH) and Machakos (MK) was investigated. The equilibrium adsorption data, tested against three ...
Efficient Removal of Sulfamethoxazole onto Sugarcane Bagasse-derived Biochar: Two and Three-parameter Isotherms, Kinetics and Thermodynamics

Shikuku, Victor Odhiambo; Kimosop, Selly Jemutai (South African Chemical Institute, 2020-03-20)

In this work, bagasse, an agricultural waste was used for the development of environmentally benign biochar (CBG) and the thermal pyrolysis product applied for adsorption of sulfamethoxazole (SMX) from water using a batch ...

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