Abstract
The study presents the adsorption of Cu (II) ions from aqueous solution by plantain stalk (musa paradisiacal) in relation to its equilibrium and kinetics characteristics, using batch adsorption method. The adsorbent was characterized using FTIR Spectrometry. The following functional groups were observed; hydroxyl, carbonyl, amine and phosphate groups which confirms the potential capability of sorption of the biosorbent. The study shows that there was optimum adsorption at pH 6.0 (75.41%) for Cu (II) ions. There was significant adsorption from the lowest to the highest time (5-180mins) and also there is a significant removal of the metal ions from the lowest to the highest concentration (10 mg/l-500 mg/l). The study also revealed that adsorption of Cu(II) ions by plantain stalk from aqueous solution is best described by Langmuir isotherm due to its R2 values of 0.950. When both order rate equations were tested, data showed a good compliance with the pseudo-second-order rate constant for Cu(II) ions due to its R2 value of 0.999, while the data for pseudo-first-order did not show a good compliance with Cu(II) ions due to its R2 value of 0.549. The results obtained from this study show that plantain stalk is a good adsorbent for the removal of Cu (II) ions from aqueous solution.
Highlights
Copper is among the major pollutants, which enter the water bodies through various industrial operations such as mining, farming, metal plating etc
From the Fourier Transformed Infrared (FTIR) spectra, the adsorbent display the presence of esther, alkenes, phosphate, hydroxyl, azide, carbonyl, amine and nitro for the adsorption of the metal at pH 6.0, when it is passed through the metal ions solution and through the deionized water
The process of adsorption of the metal ions is stable, fast, and a good percentage of the metal ions were absorbed by the adsorbent at initial pH, contact time and concentration, there were rapid absorption of metal ions
Summary
Copper is among the major pollutants, which enter the water bodies through various industrial operations such as mining, farming, metal plating etc. There have been several environmental methods used for the removal of metal ions from wastewater Some of these methods include chemical precipitation, ion exchange reverse osmosis and others. These methods were found to have some disadvantages such as generation of toxic waste, high cost, partial metal removal and requirement of high energy. This necessitates the use of biosorption methods which was found to be less costly, more efficient and does not generate toxic waste
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