Charles Otieno Onindo

Charles Otieno Onindo
Kenyatta University · Department of Chemistry

PhD

About

26
Publications
13,562
Reads
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286
Citations
Introduction
Additional affiliations
January 2010 - November 2014
Kenyatta University
Position
  • Professor (Associate)
January 1992 - July 1995
University of Leeds
Position
  • PhD Student
Description
  • PhD Student up to 1995
January 1988 - July 2016
Kenyatta University
Position
  • Professor (Associate)

Publications

Publications (26)
Article
Full-text available
Background: Electrospinning is a technique for producing nanofibers, useful in many fields of nanotechnology. The size and morphology of the nanofibers obtained depends on the polymer solution properties, the parameters of the equipment and the conditions of the surrounding. In almost all reported electrospinning set ups, a pump ,which regulates th...
Article
Full-text available
TiO 2 fibers were prepared through electrospinning of poly methyl methacrylate (PMMA) and titanium isopropoxide (TIP) solution followed by calcination of fibers in air at 500°C. Cetyltrimethylammonium bromide (CTAB) protected palladium nanoparticles (Pd NPs) prepared through reduction method were successfully adsorbed on the TiO 2 nanofibers (NF)....
Article
Full-text available
The fate of excessive fluoride in water is cause for serious public health concerns worldwide. Water defluoridation using various technologies therefore continues to attract disproportionate research interest from around the world. Defluoridation studies using soil adsorbents, in particular, has remained the focus of intense research efforts since...
Article
Full-text available
All countries in the Lake Victoria Basin depend mostly on hydroelectric power for the provision of energy. Gasification technology has a high potential for reducing biomass energy consumption whilst increasing access to modern energy services. The key aspect for the failure of gasification operations in the Lake Victoria Basin is inadequate adaptat...
Article
Full-text available
Copper-based fungicides are extensively used in the control of coffee pests and diseases because they are relatively cheap and effective. This practice presents serious environmental implications owing to the toxic nature of copper. We report here an assessment on the effects of the use of copper-based fungicides on River Kamiti, which flows along...
Article
Full-text available
The kinetics and equilibrium binding of Cd(II) ions onto raw water hyacinth (Eichhornia crassipes) biomass (RBH) were investigated with the view to utilize it as a low-cost biosorbent for removal of toxic metal ions from water. The biosorption was analyzed through batch experiments with respect to the effect of contact time, agitation speed, biosor...
Article
Full-text available
Copper‐based fungicides are extensively used in the control of coffee pests and diseases because they are relatively cheap and effective. This practice presents serious environmental implications owing to the toxic nature of copper. We report here an assessment on the effects of the use of copper‐based fungicides on River Kamiti, which flows along...
Article
Full-text available
This study was carried out to determine the levels of nitrate, nitrite and phosphorus in homemade brews, spirits and the raw materials used using the UV-Visible spectroscopy. Nitrate and nitrite were analyzed using a SHADZU (Model No. UV-2550), phosphate was analyzed using and a Philips, Scientific equipment, UP-8700 Series UV-Visible spectrophotom...
Article
Full-text available
Homemade brews and the raw materials used can be a major source of nitrate and nitrite in human diet. Because of the potential health hazards result in . high intake of nitrate and nitrite, determination of these ions content in Homemade brews and the raw materials used. Sources of nitrites include vegetables, fruit, and processed meats The aim of...
Article
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This study was carried out to determine the levels of arsenic in the home-made brews, home-made spirits, raw materials and water. One hundred and thirty two home -made alcoholic beverages, one hundred and ten water and eighteen raw materials samples obtained from various parts of Nairobi slums and its environs were analyzed for arsenic. The method...
Article
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Increased cases of deaths as a result of taking home made brews/spirits have been a major concern in our country. Recently, many lives have been lost due to the ignorance of the brewers and their patrons. This study was carried out to determine the levels of nitrate in home -made brews, home -made spirits, raw materials and water. Four hundred and...
Article
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The molybdenum(II) and tungsten(II) halocarbonyls, [M(CO)4X2]2 (M = Mo, W; X = Cl, Br) react with a large excess of the nitrogen bases, 1-methylpyrrolidine, 1-methylpiperidine, 1-ethylpiperidine and 2-ethylpiperidine to give aminecarbonyl complexes of the type M(CO)3L3 (L= alkylamine). Excess piperidine reacts with the tungsten halocarbonyls, [W(CO...
Article
Full-text available
The problem of high fluoride in water sources in Africa and the rest of the developing world has exacerbated in the latest past due to increasing shortage of water. More people are being exposed to high water fluoride resulting in elevated levels of fluorosis in the societies. Fluoride (F) adsorption from solutions using a siliceous mineral from Ke...
Article
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The equilibria that control the composition of a lake is presented using lake Baringo, Kenya, as an example. Lake Baringo (037'N, 3605'E) lies very close to the equator in the Baringo basin in the Eastern Rift Valley, Kenya. Water from the lake was analysed chemically using standard analytical techniques to obtain the stoichiometric concentration...
Article
Full-text available
This paper reports the kinetic and equilibrium studies of Eichhornia crassipes root biomass as a biosorbent for Pb(II) ions from aqueous system. Batch adsorption studies were carried out to examine the influence of various parameters such as the pH, contact time, adsorbent dose, initial metal ion concentration, temperature and agitation speed on th...
Article
Full-text available
African countries along the Great Rift Valley are among areas of the world where excess fluoride in water sources is a major public health problem. In this work, the removal of fluoride (F) from water solutions using a ferric poly-mineral (FPM) from Kenya was therefore studied using batch adsorption experiments. The effect of change in solution pH,...
Article
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Adsorption of fluoride (F) ions from water using acid treated lateritic mineral (LM-1) from Kenya was studied by batch experiments. The effect of acid-treatment of adsorbent and change in temperature, mass of LM-1, pH and selected competing ions was evaluated. The adsorption process was strongly influenced by temperature, pH and adsorbent dosage. T...
Article
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Acid treated diatomaceous earth (ATDE) from a mining site in Kenya was evaluated for its removal of F from aqueous solutions using adsorption batch experiments. The effect of initial F concentration, adsorbent dosage, contact time, temperature, pH and competing anions was studied. The adsorption process was very fast reaching an initial equilib- ri...
Article
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The paper presents the study carried out in a peri urban settlement of Nairobi Kenya and involved treatment of raw grey water generated from bathroom, kitchen and laundry for flushing toilet and laundry work. The study utilized both chemical and physical treatment. The chemical treatment involved alum addition in the raw grey water and pH adjustmen...
Article
Full-text available
This study was carried out to determine the levels of nitrate in homemade brews, spirits and the used raw materials using the UV-Visible spectroscopy. These were analyzed using, a SHADZU (Model No. UV-2550) UV-Visible spectrophotometer. The measurement was based on ISO Method (N0.6635). This was done by reducing the nitrate to nitrite in the presen...
Article
Full-text available
Potentiometric study has been carried out on (S)-*-amino-3-hydroxy-5-methyl-4-isoxazolepropanoic acid [AMPA] in the presence of transition metal ions to measure the thermodynamic stabilities of its complexes; and hence give an insight into its possible role in binding metal ions. The nitrogen donor atom of AMPA is alanine-like with the addition of...
Article
Oxime derivatives of amino acids, amides, and peptides are very efficient ligands for NiII ions forming very stable water-soluble complexes. Oxime of amino acids amides forms octahedral and square-planar complexes with the same 4N coordination mode. The spectroscopic and X-ray diffraction studies indicate an unusual role for the hydrogen bond in Ni...
Article
Results are reported from a potentiometric and spectroscopic (UV-visible, CD, and ESR) of the protonation constants and Cu(II)-complex stability constants of leucine enkephalin amide (H-Tyr-Gly-Gly-Phe-Leu-NH2, Leu-EN-amide) and two nitro analogs having 4-nitro substituent on the phenyl ring of the Phe residue, (H-Tyr-Gly-Gly-Phe(NO2)-LeuNH2, Leu-E...
Article
The formation of the complexes formed by NiII and ZnII with Asp-Asp-Asp and a series of tetrapeptides containing one or two Asp residues or one Glu residue are reported. Stability constants were measured pH-metrically. The particular species and the metal ion binding sites were determined using 1H NMR, UV-vis and CD spectroscopy. The β-carboxylate...
Article
Full-text available
Complexes formed by the N-pyruvoylamino acid oximes CH3C(NOH)CONHCHRCO2H, where R = H, Me, CH2Ph or (CH2)2SMe, and 2-hydroxyiminopropanoic acid [alanine oxime, CH3C(NOH)-CO2H] and some derivatives with H+ and Cu2+ have been studied in aqueous solution using a combination of pH-metric titrations, UV/VIS and EPR spectroscopy. The oxime group was able...

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