Isaac Mwangi

Isaac Mwangi
Kenyatta University · Department of Chemistry

PhD

About

33
Publications
11,573
Reads
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179
Citations
Additional affiliations
January 2013 - June 2013
University of Johannesburg
Position
  • PostDoc Position
December 1988 - December 2015
Kenyatta University
Position
  • Lecturer
December 1988 - present
Kenyatta University
Position
  • Lecturer
Description
  • Improving the quality of life

Publications

Publications (33)
Article
Full-text available
Photocatalytic degradation of dissolved organic carbon (DOC) by utilizing Fe(III)-doped TiO2 at the visible radiation range is hereby reported. The photocatalyst was immobilized on sintered glass frits with the coating done by wet method, calcinated at 500 °C and then applied in a photodegradation reactor. The addition of a transition metal dopant,...
Article
Full-text available
Powdered maize tassels were studied and found to exhibit metal sorption properties due to the availability of functional groups. The tassels have a high amount of soluble organic substances that can dissolve in aqueous media, contributing to secondary pollution during a water treatment process. A chelating agent was chemically attached on the maize...
Article
Full-text available
Domestic water is abstracted from its sources in raw form with a high content of dissolved and suspended material. Polydiallyldimethylammonium chloride (polyDADMAC) is a cationic polyelectrolyte used in the initial water clarification process. However, its residues in treated water pose a health risk as they react with chlorine to produce a carcino...
Article
The demand for clean water is on the increase as the population increases. One of the ways to address the water shortage is to treat the polluted water through removal of the contaminants. The use of adsorbents for pollutant removal is one of the promising methods. Seaweed is an aquatic plant and its sorption ability for selected metals in water wa...
Preprint
Full-text available
This paper reports on the preparation and modification of azotized polyethylene terephthalate (PET) as a stable and colour sensitive absorbent for metals in aqueous media and its application in the removal of heavy metal ions from water. This study successfully functionalized PET to produce an azotized material which was confirmed by FTIR (Fourier...
Article
Full-text available
Availability of clean water is of concern due to pollution and diminishing supply pollution. However, purification is possible depending on the incorporated contaminants. Domestic wastewater contains dissolved organic matter and its remediation can be done by oxidation. The best oxidation can be achieved by electron transfer the same way metabolic...
Article
Full-text available
Abstract Anthropogenic activities contribute large amounts of pollutants to the environment which threaten animal and human health. There is increased realization of the effect of these toxins on surface and ground water, consequently, their elimination is vital in rendering secure water for drinking as well as culpable release of effluents to our...
Article
Full-text available
Phenolic compounds are injurious to human and animal health, for instance PNP is an eye irritant and its ingestion or inhalation brings about vomiting, sleepiness, headaches and ataxia. Interaction of PNP with blood leads to confusion, cyanosis and unconsciousness. Conventional water treatment methods for example; use of activated carbons involve h...
Article
Flesh from animals is one of the nutritious foods rich in vitamin B complex, iron, zinc, selenium, phosphorous, fats and magnesium. Due to this high food value, it attracts bacteria, yeasts, molds and other lower life forms that infest on it and hence undergoes natural decay process fast. Poor handling practices by small scale enterprise in the bee...
Article
This study reports on the treatment of wastewater containing dissolved organic matter (DOM). DOM introduces complexing agents, promotes bacterial growth, and affects the color plus taste of water negatively. The normal practice for treatment such pollutants is the use of introduction of oxidizing agents in the water. However, this introduces second...
Article
Studies of relationship between pH variation and the nutrients distribution in the substrate/water mixture provides information about the concentration of the nutrients anchored in the substrate and the efficiency in which they are availed and controlled for plant relative growth. The technique for determining this relationship was based on measure...
Article
Loss of available land for plant growth has made other options that allow an efficient use of water and fertilizers which increase crop quality and productivity. Some systems such as hydroponics need a constant air and fluid circulation as well as nutrient refill that put strain on the cost of production. Without such a system, many growers dump th...
Article
Full-text available
Introduction This study reports on water management in the fields found in arid areas by the improvement of the soil’s water retention capacity. This was done using hydrogels from animal wastes to mitigate the effects of climate change that lead to rapid evaporation of water hence increased desertification rates. Method The modification of the cow...
Article
Full-text available
This paper reports the removal of fluoride ions in stored drinking water by a container made from chemically modified polyethylene material. To anchor triethylamine within the structure of the polyethylene material and improve its value, the polyethylene was first heated to melting. To the molten material, hot vegetable oil was added slowly with co...
Article
Full-text available
In many countries, there occur large deposits of copper with no locally established copper based industries. This is because known methods for extraction are expensive. This study reports on a viable wet method for extraction of copper from their respective ores, using hydrazones prepared in situ from chicken dung leached solution. The method invol...
Article
COPPER EXTRACTION USING A WET CHEMICAL METHOD Abstract In many countries large deposits of copper with no locally established copper based industries occur because known methods for extraction are prohibitively expensive and unaffordable. This study reports on an affordable and sustainable method for the extraction of copper. This was achieved thro...
Article
Full-text available
In many countries large deposits of copper with no locally established copper based industries occur because known methods for extraction are prohibitively expensive and unaffordable. This study reports on an affordable and sustainable method for the extraction of copper. This was achieved through the use of a wet chemical method which makes use of...
Chapter
Full-text available
The presence of heavy metals in water is of concern due to the risk toxicity. Thus there is need for their removal for the safety of consumers. Methods applied for removal of heavy metals include adsorption, membrane filtration and co-precipitation. However, studies have revealed adsorption is highly effective technique. Most adsorbents are expensi...
Article
Full-text available
This is a report on comprehensive characterization of cadmium (Cd)-exposed root proteomes in tomato using label-free quantitative proteomic approach. Two genotypes differing in Cd tolerance, Pusa Ruby (Cd-tolerant) and Calabash Rouge (Cd-sensitive), were exposed during 4 days to assess the Cd-induced effects on root proteome. The overall changes in...
Article
Full-text available
Several methods for the removal of fluorides in water have been proposed, most of which rely on the use of biomaterials and bone char. In such processes, the adsorbent become loaded with the pre-concentrated pollutant leading to a disposal problem. This study reports on the modification of the maize tassels with triethylamine followed by its subseq...
Article
Full-text available
IAbstract Several methods for the removal of fluorides in water have been proposed, most of which rely on the use of biomaterials and bone char. In such processes, the adsorbent become loaded with the pre-concentrated pollutant leading to a disposal problem. This study reports on the modification of the maize tassels with triethylamine followed by...
Article
Full-text available
The dispersal of toxic heavy metals by water from natural and anthropogenic is a worldwide environmental concern due to pollution. Despite some metals playing an important role in body, they are toxic when the level exceeds the tolerance limits while others such as lead have no known physiological value to human beings. Since heavy metals cannot be...
Article
Full-text available
Chlorine added to drinking water as a disinfectant is a concern of this generation. This is because chlorine reacts with dissolved organic compounds to form polychlorinated complexes that are carcinogenic. Available methods for the removal of chlorine and chlorinated compounds include adsorption, precipitation, electrolysis and ozonation, but some...
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
This paper reports on the preparation and modification of powdered maize tassels with polydiallyldimethylammonium chloride (polyDADMAC). The modified tassel were applied for the removal of phenolic compounds from water, through adsorption. The effect of contact time, sorbent dose, pH of the sample and the adsorption capacity were investigated at fi...
Article
Full-text available
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...
Chapter
Full-text available
This study reports on the synthesis of an adsorbent for the preconcentration of heavy metals at trace levels in environmental samples. Amberlite XAD resins are excellent support materials because of their high surface area and good mechanical stability. Ethylenediamine was chemically anchored on the resin to create active sites for metal adsorption...
Article
Full-text available
Polydiallyldimethylammonium chloride (polyDADMAC) is a water-soluble cationic polyelectrolyte used for water treatment. Its residues in treated water are contaminants as they react with chlorine to produce a carcinogenic compound. Commonly-used techniques for quantification of the polycation, such as colloidal and potentiometric titration as well a...

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Projects

Projects (4)
Project
to synthesize adsorbents from locally available materials and apply these adsorbents in their raw and modified forms in removal of selected phenolic compounds and some bacteria from contaminated water