• Equilibrium Studies for Adsorption of Zn2+ on to Acid Treated Kikuyu Grass Pennisetum Clandestinum Biomass 

  Murithi, Genson; wa-Thiong’o, Karanja; Wachira, Jackson M. (2016-04)

  The feasibility of using Pennisetum clandestinum biomass as low-cost adsorbent for the removal of Zn2+ was investigated in batch studies. The Freundlich, Langmuir,Dubinin Raduskevich and Temkin adsorption isotherms were ...
• Fixed Column Removal of Lead (II) Ions from Industrial Effluent using Pig Bone Char, Rice-Husks Ash and Water Hyacinth Composite Adsorbent 

  Murithi, Genson; wa-Thiong’o, Karanja; Wachira, Jackson M. (2018-02)

  The adsorption potential of pig bone char (PBC), rice husk ash (RHA) and water hyacinth biomass (WHB) composite mixture to remove lead (II) ions from industrial waste water was investigated using a fixed bed column. The ...
• Ashed SBE Adsorbent for Lead and Zinc (II) Ions: Kinetic and Equilibrium Studies 

  Murithi, Genson; wa-Thiong’o, Karanja; Wachira, Jackson M. (2016-03)

  The present study investigated the adsorption potential of Ashed SBE(spent bleaching earth) to remove lead (II) and zinc (II) ions from industrial effluent. The effluent was found to have a higher percentage of lead (II) ...
• Fixed Column Study for the Removal of Zinc (II) Ions from Waste Water by Bone Char Rice Husks Ash and Water Hyacinth Composite-Mixture 

  Murithi, Genson; wa-Thiong’o, Karanja; Warui, Kariuki S.; Wachira, Jackson M. (2016-02)

  The adsorption potential of animal charcoal (BC/RHA/WH composite mixture to remove Zinc (II) ions from industrial wastewater was investigated using a fixed bed column was investigated. The effects of bed height (2 - 10) ...
• Thermoluminescence of SrAl2O4:Eu2þ, Dy3þ: Kinetic analysis of a composite-peak 

  Wako, Ali Halake; Chithambo, M. L.; Finch, A. A. (Elsevier, 2016-12)

  The kinetic analysis of thermoluminescence of beta-irradiated SrAl2O4:Eu2þ,Dy3þ is reported. The glowcurve is dominated by an apparently-single peak. It has been demonstrated using a number of tests including partial ...
• Effect of Ga3+ and Gd3+ ions substitution on the structural and optical properties of Ce3+-doped yttrium aluminium garnet phosphor nanopowders 

  Wako, Ali Halake; Dejenea, F. B.; Swart, H. C. (John Wiley & Sons, 2016-03)

  ABSTRACT: The structural and optical properties of commercially obtained Y3Al5O12:Ce3+ phosphor were investigated by replacing Al3+ with Ga3+ and Y3+ with Gd3+ in the Y3Al5O12:Ce3+ structure to form Y3(Al,Ga)5O12:Ce3+ and ...
• A preliminary study of Thermoluminescence of beta-irradiated SrAl2O4:Eu2+, Dy3+ phosphors 

  Wako, Ali Halake; Dejene, B. F.; Swart, H.C. (2015)

  Eu2+ doped and Dy3+ co-doped strontium aluminate (SrAl2O4:Eu2+,Dy3+) phosphors were synthesized by the solution - combustion technique at 500 oC using urea as a reducer, a widely known method for preparing nano sized ...
• Characterization of cerium doped yttrium gadolinium aluminate garnet (Y-Gd)3Al5O12:Ce3+ phosphor thin films fabricated by pulsed laser deposition 

  Wako, Ali Halake; Dejene, F. B.; Swart, H.C. (2015)

  Thin films of cerium doped yttrium gadolinium aluminate garnet (Y-Gd)3Al5O12:Ce3+ (YGAG:Ce) were grown on Si(100) substrates by a pulsed laser deposition (PLD) technique using a 266 nm Nd:YAG pulsed laser under varying ...
• Influence of alkaline earth metal cations; Ca2+, Sr2+ and Ba2+ on the structural and optical properties of MAl2O4: Eu2+, Nd3+ phosphors. 

  Wako, Ali Halake; Dejene, F. B.; Swart, H.C. (2014)

  Eu2+ doped and Nd3+ co-doped MAl2O4:Eu2+, Nd3+ (M = Ca, Sr, and Ba) phosphors were prepared by a solution-combustion method. The obtained powders were investigated in terms of their phase composition, particle morphology ...
• Combustion synthesis, characterization and luminescence properties of barium aluminate phosphor 

  Wako, Ali Halake; Dejene, F. B.; Swart, H.C. (Elsevier, 2014-09)

  The blue-green emitting Eu2+ and Nd3+ doped polycrystalline barium aluminate (BaAl2O4:Eu2+,Nd3+) phosphor, was prepared by a solution-combustion method at 500 °C without a post-annealing process. The characteristic variation ...
• Properties of blue emitting CaAl2O4:Eu2+, Nd3+ phosphor by optimizing the amount of flux and fuel 

  Wako, Ali Halake; Dejene, B. F.; Swart, H.C. (Elsevier, 2014-04)

  Long afterglow CaAl2O4:0.03Eu2+, 0.03Nd3+ phosphor was prepared by solution-combustion synthesis. The active role of boric acid (H3BO3) as a flux in enhancing the Eu2+ photoluminescence and the effect of a varied amount ...
• Roles of doping ions in afterglow properties of blue CaAl2O4:Eu2+,Nd3+ phosphors 

  Wako, Ali Halake; Dejene, B. F.; Swart, H.C. (2014-04)

  Eu2+ doped and Nd3+ co-doped calcium aluminate (CaAl2O4:Eu2+,Nd3+) phosphor was prepared by a urea-nitrate solution combustion method at furnace temperatures as low as 500 °C. The produced CaAl2O4:Eu2+,Nd3+ powder was ...
• Structural and luminescence properties of SrAl2O4:Eu2+,Dy3+,Nd3+ phosphor thin films grown by pulsed laser deposition 

  Wako, Ali Halake; Dejene, F. B.; Swart, H.C. (Elsevier, 2015-09)

  Thin films of Eu2þ doped and Dy3þ,Nd3þ co-doped Strontium Aluminate (SrAl2O4:Eu2þ,Dy3þ,Nd3þ) phosphors were grown on Si(100) substrates by a pulsed laser deposition (PLD) technique using a 266 nm Nd:YAG pulsed laser under ...
• Structure,morphologyandopticalpropertiesofundopedand MN-doped ZnO(1 x)Sx nano-powderspreparedbyprecipitation method 

  Wako, Ali Halake; Dejene, F. B.; Onani, M. O .; Koao, L. F.; Motloung, S. V.; Yihunie, M. T. (Elsevier, 2015-08)

  The undopedandMn-dopedZnO(1 x)Sx nano-powders weresuccessfullysynthesizedbyprecipitation method withoutusinganycappingagent.Itsstructure,morphology,elementalanalysis,opticaland luminescence propertiesweredeterminedbysc ...
• Effect of Ga3+ and Gd3+ ions substitution on the structural and optical properties of Ce3+-doped yttrium aluminium garnet phosphor nanopowders 

  Wako, Ali Halake; Dejene, F. B.; Swart, H.C. (John Wiley & Sons, 2016-01)

  ABSTRACT: The structural and optical properties of commercially obtained Y3Al5O12:Ce3+ phosphor were investigated by replacing Al3+ with Ga3+ and Y3+ with Gd3+ in the Y3Al5O12:Ce3+ structure to form Y3(Al,Ga)5O12:Ce3+ and ...
• Trap characteristics of UV-activated Y3(Al,Ga)5O12:Ce3+phosphorsA 

  Wako, Ali Halake; Dejene, F. B.; Swart, H.C. (Elsevier, 2015-12)

  tThis paper reports on the trap characteristics of commercially obtained Y3(Al,Ga)5O12:Ce3+phosphorpowder. The effects of UV irradiation time and different heating rates have been discussed using differentthermoluminescence ...
• Anti-Bacterialactivities And Phytochemical Screening Of Extracts Of Different Parts Of Thalictrum Rhynchocarpum 

  Mayeku, Philip Wafula; Hassanali, Ahmed M.; Kiremire, Bernard T.; Odalo, Josiah O.; Hertweck, Christian (2013)

  Parts of the plant Thalictrum rhyncocarpum are used in herbal medicine in Kenya to treat various infections. The aim of this study was to evaluate in-vitro anti-bacteria activities and phytochemical profiles of solvent ...
• Thalictramine, A new alkaloid from Thalictrum rhyncocarpum (Dill & Rich) and its anti-bacterial activity 

  Mayeku, Philip Wafula; Odalo, J. O.; Hassanali, A.; Kiremire, B. T.; Hertweck, C. (2014)

  Thalictrum rhyncocarpum, a creeping plant with fern-like leaves, is used in herbal medicine to treat various infections in parts of Africa. Previously, we reported In-vitro anti-bacterial activity of different parts (root, ...
• Chemical composition and mosquito repellency of essential oil of Conyza newii propagated in different geographical locations of Kenya 

  Mayeku, Philip Wafula; Omollo, N. I.; Odalo, O. J.; Ahmed, Hassanali (John Wiley & Sons, 2014)

  Previously, essential oil of Conyza newii (Asterale: Asteracea, Oliv. & Hiern) growing in the northern part of West Pokot (35◦E, 1◦N) of Kenya was shown to be highly repellent [RD50 =8.9×10−5 mg/cm2, 95% confidence interval ...
• Phenolic and Monoterpenoid Mosquito Repellent Constituents of Headspace Vapors of Conyza newii 

  Mayeku, Philip Wafula; Sauda, Swaleh; Ahmed, Hassanali (2013-01)

  The plant Conyza newii has been reported to posses, mosquito repellent and fumigant toxicity properties. In this study headspace vapors emitted by the plant were obtained by adsorption on porapak Q® through headspace ...

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