Abstract
The present research work demonstrated the ability of MMOL in removing Copper (II) ions from an aqueous solution. The modified (MMOL) and unmodified moringaoleifera (UMOL) was characterized based on PZC and surface area. Isotherm experiments were conducted and the data obtained were fitted to Langmuir and Freundlich isotherm equations. The Freundlich equation gave the best description of the sorption process and the maximum saturated monolayer sorption capacity of the MMOL for CU (II) ions was 78.45 mg g-1. The kinetics of the sorption process was studied by varying the initial CU (II) ions concentrations and the result obtained was analyzed by using pseudo-first-order and pseudo-second-order kinetic models. The pseudo second-order kinetic model was found to fit the experimental data for the entire sorption period with high coefficient of determination (r2). The effects of MMOL dose were studied using batch sorption system. The linear form of the Langmuir equation was used to analyze the data obtained when the sorbent dosage was optimized by method of continuous variation. The results obtained showed that the equilibrium monolayer sorption capacity, qm, of the MMOL for CU (II) ions decreased (78.45 - 38.66 mg g-1) with an increase in sorbent dosage. The result obtained from pH optimization showed that CU(II) ions removal increases with increase in CU(II) ions solution pH.
Highlights
Water pollution containing heavy metal ions such as chromium, cadmium, copper, lead, nickel, mercury and zinc from industrial and domestic wastes is becoming one of the most serious environmental problems worldwide [1]
The results of the specific surface area of the unmodified moringaoleifera (UMOL) and Modified Moringa Oleiferal Leaves (MMOL) showed that the acid treated samplehad higher specific surface area (106m2/g) than that of the UMOL (33m2/g)
The higher specific surface area of the MMOL could be ascribed to the acid modification of the moringaoleifera leaves (MOL) which opened up the pores
Summary
Water pollution containing heavy metal ions such as chromium, cadmium, copper, lead, nickel, mercury and zinc from industrial and domestic wastes is becoming one of the most serious environmental problems worldwide [1]. Adsorption has evolved as the front line of defense and especially for those, which cannot be removed by other techniques [4] These methods may affect the generation of secondary wastes, which are difficult to treat. If the reaction is reversible, as it is for many compounds adsorbed to activated carbon, molecules continue to accumulate on the surface until the rate of the forward reaction (adsorption) equals the rate of the reverse reaction (desorption). When this condition exists, equilibrium has been reached and no further accumulation will occur. The effect of biosorbent pH, dosage and time were studied
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