Browsing by Author "Machunda, Revocatus"
Now showing items 21-40 of 105
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Defluoridation of Water Supplies Using Coconut Shells Activated Carbon: Batch Studies
Said, Mateso; Machunda, Revocatus (IJSR, 2014)Drinking water with elevated fluoride levels results in serious irreparable health problem that has attained an alarming dimension all over the world, Tanzania being one of the affected countries; techniques have been ... -
Distribution of fluoride in beans and maize grown along the slope of Mount Meru, Tanzania
Masawe, Khairia; Mtei, Kelvin; Machunda, Revocatus (Journal of Biodiversity and Environmental Sciences, 2019-11-30)This study assessed the uptake and distribution of fluoride in maize and beans grown in fluoride contaminated soils, (Ngarenanyuki) around Mount Meru in Northern Tanzania during the rainy season. The study revealed that ... -
Efficacy of Aqueous Extracts from Syzygium aromaticum, Tephrosia vogelii, and Croton dichogamus against Myzus persicae on Brassica oleracea in Northern Tanzania
Mpumi, Nelson; Mtei, Kelvin; Machunda, Revocatus; Ndakidemi, Patrick (Hindawi Limited, 2021-07-19)The effectiveness of 1, 5, and 10% w/v of aqueous extracts of Croton dichogamus, Tephrosia vogelii, and Syzygium aromaticum and their mixture (2.5 and 5%) was evaluated against Myzus persicae on Brassica oleracea under ... -
Electrocatalytic reduction of CO2 gas at Sn based gas diffusion electrode
Machunda, Revocatus; Ju, HyungKuK; Lee, Jaeyoung (Elsevier B.V., 2011-07-01)The tin (Sn) based gas diffusion electrode was fabricated and applied for CO2 electroreduction in a zero gap cell. The fabrication was done by electrodeposition from a simple citrateechloride plating solution by chrono ... -
Enhanced electrosorption capacity of activated carbon electrodes for deionized water production through capacitive deionization
Sufiani, Omari; Tanaka, Hideki; Teshima, Katsuya; Machunda, Revocatus; Jande, Yusufu (Elsevier Ltd., 2020)The deionized water (DI) of high purity standards is used in several industrial processes to manufacture products and technologies for high end applications. Currently, DI water is produced by either reverse osmosis or ... -
An Evaluation of Sustainability Potential of Existing Septic Systems: A Fuzzy-Based Indexing Approach
Salvatory, Siliacus; Machunda, Revocatus; Mwamila, Tulinave (MDPI, 2022-05-05)In this study, a fuzzy-based indexing approach (FIA) is developed based on a conceptual framework regarding social, environmental, economic, and technical dimensions to evaluate the overall sustainability potential of ... -
Facile biosynthesis of Ag–ZnO nanocomposites using Launaea cornuta leaf extract and their antimicrobial activity
Makauki, Elizabeth; Mtavangu, Stanslaus; Onita, Basu; Rwiza, Mwemezi; Machunda, Revocatus (NM-AIST, 2013-11-14)The quest to synthesize safe, non-hazardous Ag–ZnO nanoomposites (NCs) with improved physical and chemical prop- erties has necessitated green synthesis approaches. In this research, Launaea cornuta leaf extract was ... -
Fluoride Sorption Using Zirconium ion-impregnated Macadamia Nutshell-Derived Biochar from Aqueous Solution: Adsorption Isotherms and Kinetic Modeling
Yegon, Andrew; Mtavangu, Stanslaus; Rwiza, Mwemezi; Machunda, Revocatus (Research Article, 2022-11-26)Zirconium ion-impregnated macadamia nutshell biochar (ZMNB) was synthesized and tested for its fluoride sorption capacity by exploiting batch experiments. Four temperatures (300, 400, 500, and 600 ℃) were used to pyrolyze ... -
Fluoride Variations in Rivers on the Slopes of Mount Meru in Tanzania
Kitalika, Aldo; Machunda, Revocatus; Komakech, Hans; Njau, Karoli (Hindawi, 2018-01-23)This study reports the variations of fluoride ions in rivers on the slopes of Mount Meru in the northern part of Tanzania. More than 318 water samples were collected from Temi, Nduruma, Tengeru, andMaji ya Chai Rivers in ... -
Fluoride Variations in Rivers on the Slopes of Mount Meru in Tanzania
Kitalika, Aldo; Machunda, Revocatus; Komakech, Hans; Njau, Karoli (Hindawi, 2018-01-23)This study reports the variations of fluoride ions in rivers on the slopes of Mount Meru in the northern part of Tanzania. More than 318 water samples were collected from Temi, Nduruma, Tengeru, and Maji ya Chai Rivers in ... -
Functional impacts of polyaniline in composite matrix of photocatalysts: an instrumental overview
Oyetade, Joshua; Machunda, Revocatus; Hilonga, Askwar (Royal Society of Chemistry, 2023-05-22)The challenges associated with photocatalysts including their agglomeration, electron–hole recombination and limited optoelectronic reactivity to visible light during the photocatalysis of dye-laden effluent make it necessary ... -
Harmful algal bloom and associated health risks among users of Lake Victoria freshwater: Ukerewe Island, Tanzania
Mchau, Geofrey; Makule, Edna; Machunda, Revocatus; Gong, Yun; Kimanya, Martin (J Water Health, 2019-07-24)There is a global concern regarding the occurrences of harmful algal blooms (HABs) and their effects on human health. Lake Victoria (LV) has been reported to face eutrophication challenges, resulting in an increase of ... -
Highly porous biomass-based capacitive deionization electrodes for water defluoridation
Elisadiki, Joyce; Jande, Yusufu; Kibona, Talam; Machunda, Revocatus (Springer Nature Switzerland AG., 2019-12-09)The high concentration of fluoride (F−) in water sources is the main challenge in major fluoride belts. Though capacitive deionization (CDI) with porous carbon electrodes is the promising alternative in removing charged ... -
Hydroxyapatite-activated seaweed biochar for enhanced remediation of fluoride contaminated soil at various pH ranges
Moirana, Ruth; Mkunda, Josephine; Machunda, Revocatus; Paradelo, Marcos; Mtei, Kelvin (Elsevier, 2022-12-10)This study investigated the defluoridation efficiency of hydroxyapatite-activated seaweed (Eucheuma Cottonii) biochar (HSB) at various soil pH ranges (3–11) while monitoring the impact of contact time (30 min - 2.5 h), ... -
Hydroxyapatite-activated seaweed biochar for enhanced remediation of fluoride contaminated soil at various pH ranges.
Moirana, Ruth; Mkunda, Josephine; Machunda, Revocatus; Paradelo, Marcos; Mtei, Kelvin (Elsevier Ltd., 2022-12-10)This study investigated the defluoridation efficiency of hydroxyapatite-activated seaweed (Eucheuma Cottonii) biochar (HSB) at various soil pH ranges (3–11) while monitoring the impact of contact time (30 min - 2.5 h), ... -
Impacts of Wood Fuel Uses on Forest Cover: The Case of Semiarid Areas in Northern Tanzania
Mahushi, Debora; Machunda, Revocatus; Kibona, Talam (University of Dar es Salaam, 2021)Satellite images for the years 1987, 1997, 2002 and 2017, and questionnaire surveys were used to assess energy sources and demands as well as the impacts of wood fuel use to forest cover changes in Meru and Mwanga ... -
In situ facile green synthesis of Ag–ZnO nanocomposites using Tetradenia riperia leaf extract and its antimicrobial efficacy on water disinfection
Mtavangu, Stanslaus; Machunda, Revocatus; Bruggen, Bart; Njau, Karoli (Springer Nature Limited, 2022-09-13)In this work, Ag–ZnO nanocomposites were prepared by a green synthesis route using aqueous leaf extract of Tetradenia riperia and investigated for antibacterial activity against Escherichia coli and Staphylococcus aureus. ... -
In-situ synthesis of calcium/magnesium phosphate system for water de-fluoridation: Clay ceramic materials
Mahene, Wilson; Hilonga, Askwar; Machunda, Revocatus (Elsevier, 2022-02-15)Clay ceramic water filters impregnated with silver colloids have been used to purify water in many parts of East Africa disregarding the removal of fluoride, which is a health-threatening ion in water supplies. This paper ... -
The Influence of Fertilizers on the Behavior of Fluoride Fractions in the Alkaline Soil
Moirana, Ruth; Mkunda, Josephine; Perez, Marcos; Machunda, Revocatus; Mtei, Kelvin (Elsevier, 2021-08-23)It has been established that fluoride bioavailability in the soil is defined by the form which it exists rather than the amount of total fluoride. In the soil, fluoride exist in different fractions such as water soluble ... -
Influence of fluoride on the prevalence of diabetes mellitus in selected fluoride endemic areas of Tanzania
Epafra, Godson; Machunda, Revocatus; Shirima, Gabriel (International Journal of Biosciences, 2019-11-15)Diabetes Mellitus prevalence in developing countries and globally is on the increase due to various factors and its association with excessive fluoride contamination is not much elucidated. This study aims to determine ...