Browsing by Author "Ogunkunle CO"

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    Assessment of metallic pollution status of surface water and aquatic macrophytes of earthen dams in Ilorin, north-central of Nigeria as indicators of environmental health
    (2016) Ogunkunle CO; Mustapha K; Oyedeji S; Fatoba PO
    The functional quality of an aquatic ecosystem is a reflection of the health of the environment. Therefore, the present study evaluates the trace metal contamination (Pb, Cd, Ni and Mn) of water and aquatic macrophytes in Asa, Agba, Unilorin and Sobi (Moro) earthen dams, north-central Nigeria to evaluate the level of anthropogenic impact on the immediate environment. The concentrations of trace metals in samples of water and available macrophytes from the earthen dams were determined by Atomic Absorption Spectrophotometry. Trace metal contamination of surface water in the earthen dams was assessed using metal index (MPI) and metal pollution index (HPI). The biological accumulation factor of trace metals in the aquatic macrophytes was extrapolated from trace metal concentrations in the water and macrophyte samples. The results of the MPI revealed gross metal contamination of the surface water by Pb and Cd (>6.0 for both metals) in the four earthen dams; while Agba and Sobi dams were slightly contaminated by Ni (MPIs=1.43 and 1.14 respectively). All the earthen dams were considered safe from Mn contamination (MPI100), but Asa dam (HPI=2682.4) was the most contaminated. The biological accumulation factor of Mn in the macrophytes indicated Ceratophyllum demersum, Pycreus lanceolatus and Pistia stratiotes as moderate accumulators of Mn, and can be used as bioindicators in monitoring Mn pollution of aquatic ecosystem. The obtained results in this study showed that the earthen dams are polluted by Pb, Cd and Ni which pose human health risks to the inhabitants through drinking water.
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    Nanomaterial-based biosorbents: Adsorbent for efficient removal of selected organic pollutants from industrial wastewater
    (2022) Okoro HK; Pandey S; Ogunkunle CO; Ngila CJ; Zvinowanda C; Jimoh I; Lawal IA; Orosun MM; Adeniyi AG
    The contamination of the environment by organic pollutants is a major risk factor, particularly for developing countries. Selected organic pollutants (SOPs) like the phenolic compounds, polyaromatic hydrocarbons (PAHs), pesticides, and herbicides pose serious environmental and health issues owing to their toxic characteristics and poor degradability. Apart from their potential mutagenicity, carcinogenicity, tetragenicity and high body accumulation, these pollutants have become an increase concern worldwide. Biosorption is a promising alternative strategy for removing organic pollutants during water purification processes. Biosorbents have several advantages such as simplicity of operation, good sorption capacity, high recoverability and modifiability. As a result, the focus and novelty of this review is on recent trends in the use of biosorbents, with a particular emphasis on the removal of SOPs from wastewater. It also cover use of bacteria biosorbents, fungal, algae and chitosan/chitin biosorbents. Apart from that, we have also reviewed various classes of SOPs, their levels in the environment, classification and available characteristics techniques suitable for the adsorption experiments of these nanocomposites materials. In addition, we have provided comprehensive explanations and conclusions on possible future application of biosorbents and the mechanism of adsorption of these materials for removal of these SOPs from wastewater during water purification processes.