Browsing by Author "FELEKE GUADIE"

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    SYNTHESIS AND CHARACTERIZATION OF MORINGA OLEIFERA WITH REDUCED GRAPHENE OXIDE NANOCOMPOSITE FOR ADSORPTIVE REMOVAL OF IRON FROM GROUND WATER
    (Wolkite University, 2023-01-30) FELEKE GUADIE
    Treatment of potable ground water in rural areas is still a serious problem in Ethiopia. This studywas conducted to investigate low-cost, environmental friendly and innovative composite adsorbent(rGO/MO) for the removal of elevated ferrous iron (Fe2+) from three randomly selected shallowwell water samples. All water samples were analyzed by different parameters like pH, temperature,electrical conductivity, turbidity, TDS, TSS, hardness, chlorides, alkalinity and Fe2+Concentration. The results of the study were ranged as pH (6.52-–7.22), Temperature (21.3–22.7 ℃), E.C (76.8–151.3 µS/cm), turbidity (15–22 NTU),TDS (79.2–121.3 mg/L), TSS (50–100mg/L), hardness(120–280 mg/L), chlorides(93–125 mg/L), alkalinity (200–550 mg/L) andFe2+(0.62–0.66 mg/L). The values of most of the parameters such as pH, conductivity, temperature,TDS, hardness, and chloride content were within the permissible limit of WHO and EEPA.However, the concentration of Fe2+ was above the maximum permissible limit set by WHO.Similarly, the values of physicochemical parameters such as turbidity, TSS, and alkalinity wereabove the acceptable range for drinking water limit set by WHO and EEPA. Thus, the resultshowed that the potable ground water collected from rural areas pose a risk to human healthunless a proper water treatment system is implemented. The investigated adsorbents (MO, rGO,and rGO/MO) were characterized by FTIR, SEM, XRD and UV-Visible techniques. An adsorptionresults showed remarkable adsorption capacity (qmax) of 44.6 mg/g as obtained from theexperiment. The adsorption efficiency of rGO/MO adsorbent for elevated ferrous iron removal wasaffected by parameters like initial metal concentration, contact time, pH, and adsorbent dose. Thehighest adsorption efficiency was observed (99.2 %) at pH 9. The optimum contact time for theadsorption process was found to be at 50 minutes. The amount of Fe2+ ions adsorbed decreaseswith increasing in initial metal ion concentration. FT-IR data indicated that the adsorption ofmetal ions occurs on the surface of rGO/MO powder as the main functional groups that areresponsible for metal ions binding are involved in the process. The Langmuir isotherm data Fe2+has good fit with the experimental data (R2=0.994) than Freundlich isotherm data Fe2+(R2=0.979)