Solomon OmwomaJaramogi Oginga Odinga University of Science and Technology · Department of Physical Sciences
Solomon Omwoma
Environmental/Analytical/Inorganic Chemistry (Ph.D)
About
66
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Introduction
Dr. Solomon Omwoma received his Bachelor of Education in Science, and Master degree in Chemistry at Maseno University Kenya, in 2006 and 2010 respectively. He went to Helmholtz-Zentrum München, Germany in 2011 as a visiting scholar where he learned more about pollutant analysis techniques. He later joined Beijing University of Chemical Technology, China to pursue a Ph.D. degree in Chemistry under the supervision of Prof. Yu-Fei Song (2012 to 2015).
Additional affiliations
September 2012 - December 2015
September 2010 - August 2012
August 2010 - September 2012
Publications
Publications (66)
![Fig. 3. Flow diagram for local juice extraction Source: [11]](profile/Solomon-Omwoma/publication/383402466/figure/fig1/AS:11431281273441308@1724591785304/Flow-diagram-for-local-juice-extraction-Source-11_Q320.jpg)
Kenya envisioned that by 2030 it would have improved citizen livelihood through agricultural industrialization. Some challenges exist in achieving this goal, especially the effects of climate change and technology transfer. Sugarcane production, for instance, has been elusive with several factories in Kenya experiencing losses. In this work, we exp...
![Antioxidants in various edible oils [21]](profile/Solomon-Omwoma/publication/383406576/figure/tbl1/AS:11431281273478796@1724593466089/Antioxidants-in-various-edible-oils-21_Q320.jpg)
Globally there is a huge attention towards natural products and in this case natural antioxidants. The attention has been driven by consumer demands and documented detrimental effects of synthetic antioxidants on human health. In view of this, this review has evaluated a range of scientific studies and experimental investigations providing a compre...
Zeolites have attracted attention for their potential in adsorbing environmental contaminants. However, contaminants, such as acaricides used extensively in livestock production to control ticks and mites, have received limited exploration regarding their adsorption onto zeolite surfaces. This study aimed to identify the most appropriate zeolite fr...
Extensive use of chemicals in food production, although useful, has serious implications. Acaricides, which are extensively used to control ticks and mites in livestock farming, can leave harmful residues that pose risks to unintended organisms such as plants, insects, people, and other animals. Thus, limiting non-target exposure to acaricides is c...
This study employs a data-guided approach to evaluate zeolites for hydrogen storage, utilizing molecular simulations. The development of efficient and practical hydrogen storage materials is crucial for advancing clean energy technologies. Zeolites have shown promise as potential candidates due to their unique porous structure and tunable propertie...
This study investigates the adsorption capacities of selected organochlorines on zeolites, focusing on hexachlorobenzene (HCB), hexachlorotetradecane (HCTD), hexachlorodecane (HCD), hexachlorocyclohexane (HCH), heptachlorodecane (HPCD), octachlorodecane (OCD), dichlorodiphenyltrichloroethane (DDT), and octachlorotetradecane (OCTD). The structures o...
Microplastics (MPs) are microscopic and ubiquitous emerging organic contaminants with marked potential to bind, concentrate and act as carriers of other toxic compounds and pathogenic microorganisms. They have been extensively studied in the marine environment, but reliable data on them in freshwater ecosystems especially in developing countries re...
Sexual disorders such as erectile dysfunction (ED), sterility, and sexual inappetence represent some of the complex reproductive challenges that require addressing the underlying causes. The aim of this paper was to systematically synthesize literature on the ethnobotany, phytochemistry, bioactivities, and safety of plants used as remedies for mana...
Grand Canonical Monte Carlo (GCMC) simulations have been used to evaluate the hydrogen storage performance on 233 zeolites. LTA had the highest capacity with a hydrogen capacity of 4.8%wt. The second ranked zeolite is JBW with a hydrogen uptake capacity of 3.25% wt, while RTH was the third with 2.89% wt. A machine learning algorithm was used to ran...
Social Chemistry involves the interaction of humans with chemicals to solve problems in their lives. This interaction can sometimes result into hazardous practices as the humans involved might have little or no knowledge of the chemistry of the chemicals in use. Our current research involves studies on the social chemistry of acaricides used in tic...
Pesticide application in agricultural and residential areas is a worldwide practice. However , human pesticide poisoning and environmental pollution through pesticide residues remain a challenge in the developing world. The present study investigated the intensity of pesticide application in large-scale farms in Trans-Nzoia County to screen and pri...
Advected cyanobacteria, algal blooms and cyanotoxins have been increasingly detected in freshwater ecosystems. This review gives an insight into the present state of knowledge on the taxonomy, dynamics, toxic effects, human and ecological health implications of cyanobacteria, algal blooms and cyanotoxins in the East African Community lakes. The maj...
Zeolites are crystalline minerals with a characteristic three-dimensional porous structure. They continue to receive much attention in both scientific and industrial fields. This article delves into the fascinating world of zeolites, diving into its amazing features and numerous uses in a variety of industries. Zeolites have a crystalline structure...
This protocol was used in a systematic review paper. It was registered with the International Prospective Register of Systematic Reviews (PROSPERO) and can be accessed from https://www.crd.york.ac.uk/prospero/display_record.php?ID=CRD42022373152 with the registration number CRD42022373152
Wound management is key to healing. Poorly managed wounds lead to abnormal biological reactions and complications. Microorganisms, bacteria or fungi, infect such wounds leading to their chronic nature. Gold nanoparticles (Au NPs) show wound healing properties. In addition, ethnobotanical information from Siaya County in Kenya shows the leaves of Ph...
In this study, activated carbons prepared from agrowastes by chemical activation were used to remove acetic acid from an aqueous solution through a batch process. The prepared adsorbents were characterized by SEM, XRD, FT-IR, and point of zero charge (pHpzc). The effects of adsorbent dosage, initial concentration, and contact time were considered....
Research is expensive. It consumes resources including time, friendships, commitment, money sacrifices among others. One cannot gamble with research; It has to be a sure bet before you commit to undertake it. Chances of failure are minimized, triple checked and verified. Good research, therefore, anchors on a good proposal. There are millions of pr...
Small and Medium-size Enterprises (SMEs) account for 95% of manufacturing firms in developing countries. They create jobs, contribute to gross domestic product, aid industrial development, satisfy local demand for services, invent and support large firms with inputs and services. SMEs are at the heart of the market and they know their customer dema...
Green nanoparticle synthesis is a vital branch in nanotechnology. These nanoparticles are synthesized with the aid of phytochemicals in plant extracts. The phytochemicals also stabilize the synthesised nanoparticles eliminating the use of toxic capping agents. Silver and gold (Ag NPs, Au NPs) green nanoparticles are common. They have wide applicati...
Technology and Innovation Support Centers (TISCs) were established by the World Intellectual Property Organization (WIPO) in 2009 to support innovations in least developed countries. They facilitate innovators to access high quality innovations and technological information. They have been very successful in the United Kingdom and Germany. TISC imp...
A magnetically active nanocomposite material has been synthesized from the reaction mixture of magnetite core iron nanoparticles electrostatically coated with SiO2, hydrotalcite nanosheets ([Eu8 (OH)20 (H2O)n]4+), and decatungstophosphate anion ([α-PW10O367−]). The resulting nanocomposite material, denoted as Fe3O4@SiO2@LEuH@PW10, is demonstrated t...
Per- and polyfluoroalkyl substances (PFASs) are known organic pollutants with adverse health effects on humans and the ecosystem. This paper synthesises literature about the status of the pollutants and their precursors, identifies knowledge gaps and discusses future perspectives on the study of PFASs in Africa. Limited data on PFASs prevalence in...
Contamination of aquatic reservoirs with metal ions is a slow gradual process that is not easy to detect. Consequences of the metal ions, especially the ones with high atomic numbers (heavy metals) at high concentrations, are severe and irreversible in aquatic reservoirs. As such, early detection mechanisms, especially at trace concentration, are e...
Aflatoxin B1 is a toxin produced as secondary fungal metabolites by the fungus Aspergillus, particularly A. flavus. The toxin has significantly contaminated the food supply chain especially cereals in Kenya. Kenya Bureau of Standards (KEBS) has recently banned five maize flour brands, citing high aflatoxin levels. They also suspended seven peanut b...
Unilameller nanosheets with a lateral dimension of one nanometer have been isolated from a colloidal solution of europium-containing layered rare-earth hydroxide (LRH) material by the flocculation method. The nanosheets were achieved by changing pH of the colloidal solution from 6.7 to 11.5. The resultant flocculated nanosheets show high efficiency...
Cancer incidences and mortality in Kenya are increasing according to recent
reports and now number among the top five causes of mortality in the country.
The risk factors responsible for this increase in cancer incidences are assumed to be
genetic and/or environmental in nature. The environmental factors include exposure to carcinogenic contaminant...
Exposomics is assessment of organism exposure to high priority environmental pollutants in an ecosystem using OMIC technologies. A virtual organism (VO) is an artificial property-tool (OMIC) reflecting exposomic process in compartments of real organisms. The exposomics of aquatic organisms inhabiting Lake Victoria (L.V.) and Three Gorges Reservoir...
![Figure 8. Brunauer−Emmett−Teller (BET) isotherms for LEuH-[H 2 W 12 O 40 ].](profile/Solomon-Omwoma/publication/334030881/figure/fig5/AS:773977010094082@1561541907793/Brunauer-Emmett-Teller-BET-isotherms-for-LEuH-H-2-W-12-O-40_Q320.jpg)
Porous materials exhibit advantages in adsorption applications due to their ability to increase accessibility, surface area and enhanced liquid/molecular/ion transport. Condensation of WO 4 2-polyhedra units on delaminated europium containing layered rare earth hydroxide nanosheets, [Eu 8 (OH) 20 (H 2 O) n ] 4+ , at pH 5 under nitrogen environment...
The development of Africa including industrialization such as chemical production, urbanization, agriculture, waste disposal, and electric power generation has a direct and diverse effect on the environment. These activities require effective planning, consultation, evaluation, risk assessment and monitoring techniques. Diverse environmental impact...
The invention discloses layered nanocomposite double hydroxide functional materials and more specifically to technologically fine tuning the microenvironment around [EuW 10 O 36 ] 9-anion through intercalation into different compositions of layered double hydroxides (LDHs) materials thereby greatly enhancing the 5 D 0 → 7 F 2 transmissions in the [...
The invention discloses a layered nanocomposite lanthanide double hydroxides material, preparation method thereof, and the process of using them to detect heavy metals in an aquatic system through direct measurement of the adsorbed metals or by measuring phosphorescence turn off/on of the material by the adsorbed metals.
The development of Africa including industrialization such as chemical production, urbanization, agriculture,
waste disposal, and electric power generation has a direct and diverse effect on the environment. These activities
require effective planning, consultation, evaluation, risk assessment and monitoring techniques. Diverse environmental
impact...
The total weight of commercial fish (metric tons) caught in the Winam Gulf area of Lake Victoria in Kenya declined from 3300 mt to 760 mt between 1995 and 2009. Associated with this decline, and ranked in descending order, the species richness of the commercial fish catch was limited to seven major groups (Rastrineobola argentea; Lates niloticus; P...
Virtual Organisms (VO) for the lipidome are successfully utilized for the comparison of the water quality of the outlets of Lake Victoria (LV) and Three Gorges Reservoir (TGR). VO for the proteome with cellulose membranes failed due to the instability of cellulose in natural waters during VO lifetime. Other membranes will be investigated. Pattern a...
The polyoxometalate (POM) anion of europium (III) decatungstate [EuW10O36]⁹⁻ exhibits great luminescence quantum yields of approximately 67% but suffers reduced red light emissions that are due to the low ⁵D0→⁷F2 transmissions. Fine tuning the microenvironment around [EuW10O36]⁹⁻ anion through intercalation into different compositions of layered do...
Thiocarbohydrazide synthesis is an important intermediate step for many hydrazine organic synthetic reactions. Synthesis of thiocarbohydrazide can be done by reaction of carbon disulfide with hydrazine (hydrazinolysis) in water at 0°C giving 25% yield (based on [hydrazine]). However, in this article, we achieve a 96% yield (based on [hydrazine]) by...
![Fig. 1. Map of Lake Victoria showing the study sites [8]](profile/Solomon-Omwoma/publication/317578796/figure/fig17/AS:505049773686785@1497424657088/Map-of-Lake-Victoria-showing-the-study-sites-8_Q320.jpg)
Evaluation of pollutant levels in an aquatic ecosystem is an essential system management tool. The levels of Al, As, Fe, Hg, Mn, and Sn in Winam Gulf of Lake Victoria are hereby reported. The sampling sites, Carwash and Dunga beach, are areas on the shore of the lake where drinking water, fishing and tourism take place. The Analyzed surface sedimen...
A magnetically active nanocomposite material has been synthesized from the reaction mixture of the magnetite core iron nanoparticles electrostatically coated with SiO2, the hydrotalcite nanosheets ([Eu8(OH)20(H2O)n]4+) and the decatungstophosphate anion [α-PW10O367-] (PW10). The resulting nanocomposite material, denoted as Fe3O4@SiO2@LEuH@PW10, can...
A new guidance law is derived for missile against maneuvering target by adopting nonlinear H control theory. The guidance law is based on three dimension (3D) nonlinear kinematics described by modified polar coordinate (MPC). In MPC, only three differential equations are used to describe the 3D relative motion between missile and target. The new gu...
![Fig. 5. Diagram of the mercury flow system [177]](profile/Solomon-Omwoma/publication/313997640/figure/fig4/AS:465539551240193@1488004686224/Diagram-of-the-mercury-flow-system-177_Q320.jpg)
Elemental mercury is not as poisonous as its congeners such as methyl mercury and dimethyl mercury, especially at trace levels. However, understanding the speciation mechanisms of mercury in aquatic ecosystems offers an opportunity to appreciate the dangers emanating from elemental mercury in the environment. Notably, elemental mercury is occasiona...
Polyoxometalates (POMs) possess unique physical and chemical properties such as strong Brønsted acidity and oxidative ability. As a result, they have been used as efficient adsorbents and green catalysts. Nevertheless, the high crystallinity and low lattice energy largely restrict their application in industry. As such, it is of significance to dev...
We demonstrated herein the first class of polyoxometalate-containing thermotropic liquid-crystalline materials, in which the nonmesogenic organic moieties were covalently tethered onto the nanoscaled polyoxometalate. These materials showed layered smectic A (SmA) phase when cooling from isotropic state.
![Figure 2. Lignin extraction from sugarcane bagasse [144].](profile/Solomon-Omwoma/publication/272182420/figure/fig2/AS:295269225779201@1447409077470/Lignin-extraction-from-sugarcane-bagasse-144_Q320.jpg)
Sustainable sugarcane production and processing requires intensification of benefits and minimization of both short term and long term loses. Identification of long term loses/benefits from sugarcane production and processing is a difficult venture that entails critical scientific analysis based on collected scientific data, historical events and l...
Sustainable sugarcane production and processing requires intensification of benefits
and minimization of both short term and long term loses. Identification of long term
loses/benefits from sugarcane production and processing is a difficult venture that entails
critical scientific analysis based on collected scientific data, historical events and
l...
The total weight of commercial fish (metric tons) caught in the Winam Gulf area of Lake Victoria in Kenya declined from 3300 mt to 760 mt between 1995 and 2009. Associated with this decline, and ranked in descending order, the species richness of the commercial fish catch was limited to seven major groups (Rastrineobola argentea; Lates niloticus; P...
A speech I delivered to international graduates at Beijing University of Chemical Technology on their final day on Campus.
Polyoxometalates (POMs) exhibit attractive properties and great potential to meet with contemporary society demands regarding environment, materials, energy, health and information technologies etc. The development of POMs-based advanced functional materials is of significance in order to effectively utilize POMs and to match various challenges. In...
Sugarcane farming is the most important cash crop cultivation activity in the Lake Victoria basin of Kenya practised in an area covering approximately 114,000 Ha in total. For better yields, various agronomic inputs including fertilizers and herbicides have been used intensively in the farms, causing serious concerns about their potential impacts o...
Due to intensive use of agronomic inputs in sugarcane farming, runoff water from these farms is loaded with high concentrations of nutrients. These nutrients find their way into rivers, lakes and sinks, eutrophicating them. Reducing the levels of these nutrients in runoff water from sugarcane farms before it is discharged into sinks will help solve...
Continued use of nitrogenous fertilizers and biosolids in farming is known to affect the soil pH of the farms leading to acidic environment that promotes solubility, bioavailability and mobility of heavy metals. In addition, these fertilizers also contain residues of heavy metals that accumulate in soils and water bodies over time. Nzoia Sugar Comp...
Sugarcane farming has been identified as the single most cultivated cash crop in Lake Victoria basin. Use of high agronomic inputs is employed in these regions for better yields. Most rivers feeding Lake Victoria from these catchments have been reported to accumulate total heavy metals downstream above background concentrations. The source of these...
For sustainable agriculture, the health of people indulged in this activity is paramount. Disease causative agents in these areas should be constantly checked and mitigation measures taken. This research determined levels of pH, turbidity, total phosphates, nitrate nitrogen, and dissolved oxygen in River Kuywa surface water as impacted upon by suga...
Continued use of nitrogenous fertilizers and biosolids in farming is known to affect the soil pH of the farms leading to acidic environment that promotes solubility, bioavailability and mobility of heavy metals. In addition, these fertilizers also contain residues of heavy metals that accumulate in soils and water bodies over time. Nzoia Sugar Comp...
Analysis of heavy metals in top soil samples from Nzoia sugarcane farms in Western Kenya found elevated levels of heavy metals in the soils with mean concentrations (mg kg⁻¹ dry weight) of 142.38, 59.12, 73.35, 116.27, 409.84 (dry season) and 144.22, 50.29, 72.14, 158.81, 368.83 (wet season) for Cr, Pb, Cu, Zn and Fe, respectively, compared with a...
Questions
Questions (3)
During my soxhlet extraction experiments, the siphoning process abruptly stopped working. On reporting the same to my instructor, she just took aluminium foil and covered the whole soxhlet extraction chamber and the process started normally. On inquiring what was the scientific concept behind this restarting procedure, she just said...'it has worked for me in years'. As a scientist, I wish to know the underlying concept, any help?
A scientific argument between my friends ended up unresolved as regards the amount of food organisms consume. Whereas some were of the idea that the bigger the organism, the less they will consume 'old high school theory', some of us think any organism will consume food relative to its average daily energy consumption before the system reports satisfaction. And if this average value is exceeded, the system resorts to storing the extra food as fat. Any scientific data and suggestions on this topic will be very helpful to our group of 'confused' scientists.
Most data from WHO and USEPA is either based on human effect levels or modelling. I need real data.
