Abstract
This work presented the adsorption of Cu(II) ions using agriculture waste coming from soursop (Annona muricata L.) seeds. The chemical treatment performed on Annona muricata L. seeds was carried out using 1.0 M H2SO4 solutions. The Fourier-transform infrared (FTIR) spectrophotometer, scanning electron microscope coupled with energy dispersive X-ray (SEM-EDX), pH of point-zero-charge (pHPZC), and pHslurry analyses were done to characterize the surface properties of the adsorbent. Experimental conditions such as contact time, adsorbent dosage, pH, and initial Cu(II) ion concentrations, all of which could affect Cu(II) ions adsorption, were studied. The adsorption kinetics was successfully described by the pseudo-second-order model. The Langmuir and Freundlich models were applied to interpret the Cu(II) ions’ adsorption at equilibrium. The isotherm data fitted well with the Freundlich model and the maximum adsorption capacity was 187.83 mg.g-1 based on the Langmuir model.
Highlights
The discharge of heavy metal ions into water bodies from different industrial effluents, such as metal plating, petrochemicals, batteries, chemicals, paints, and pesticide production has caused serious global environmental issues (Zafar et al 2020)
Untreated and chemically treated A. muricata L. seeds have been used as an adsorbent to remove pollutants, such as Tartrazine dye (Fauzia et al 2015), Rhodamine B dye (Cairdir et al 2015), and heavy metal ions (Oboh & Aluyor 2008, Kurniawan et al 2014) from their aqueous solutions
The results showed that the maximum adsorption capacities for Pb(II) and Cu(II) ions were 5.58 and 4.16 mg.g-1, respectively
Summary
The discharge of heavy metal ions into water bodies from different industrial effluents, such as metal plating, petrochemicals, batteries, chemicals, paints, and pesticide production has caused serious global environmental issues (Zafar et al 2020). Untreated and chemically treated A. muricata L. seeds have been used as an adsorbent to remove pollutants, such as Tartrazine dye (Fauzia et al 2015), Rhodamine B dye (Cairdir et al 2015), and heavy metal ions (Oboh & Aluyor 2008, Kurniawan et al 2014) from their aqueous solutions. Oboh & Aluyor (2008) studied the adsorption of four heavy metal ions using untreated A. muricata L. seeds powder under batch mode.
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