Sequestration of Co2+, Zn2+ and Cd2+ by Base Modified Sweet Potato Leaf: Kinetics, Equilibrium and Thermodynamic Studies

Authors

  • Abimbola A. Ogundiran1 Tai Solarin University of Education, Ijagun, Ogun-State, Nigeria
  • Najeem A. A. Babarinde Olabisi Onabanjo University, Ago- Iwoye, Ogun- State, Nigeria
  • Edwin A. Ofudje Department of Chemical Sciences
  • Olusegun O. Ogundiran Tai Solarin College of Education, Omu-Ijebu, Ogun-State, Nigeria.

Keywords:

Pollution, remediation, biosorption,, sweet potato leaf, heavy metals, kinetics

Abstract

Communication in Physical Sciences, 2022, 8(1): 81- 95

Authors: Abimbola A. Ogundiran, Najeem A. A. Babarinde, Edwin A. Ofudje and Olusegun O. Ogundiran

Received: 03 November 2021/Accepted  24 March 2022

The use of base modified sweet potato leaf (BSPL) was demonstrated as an effective adsorbent for the removal of cobalt, zinc and cadmium ions using the batch adsorption process. The biosorption properties of the adsorbent for metal ions were evaluated for sorption time, initial concentration of the contaminants, pH, sorbent dosage and temperature. Maximum uptakes of metal ions were attained after 100 minutes for Zn2+and Cd2+ ions and at 150 minutes for Co2+ ions.  Kinetic analysis of the adsorption data revealed that the biosorption data were best described by the Pseudo-second-order model(R2 >0.95).  It was also apparent that the data best fitted the Langmuir model, which yielded a maximum adsorption capacity of 3.879, 4.069 and 4.368 mg.g-1  for Zn2+, Cd2+ and Co2+  respectively. Analysis of calculated thermodynamic parameters affirms that the biosorption process is feasible, spontaneous, and endothermic.  Evaluated entropy change (ΔS) for the adsorption processes were 162.12, 171.93, and 174.93 J.mol-1.K-1 for Co2+,Zn2+, and Cd2+   ions respectively which is in agreement with the expected randomness of the system.  Prominent infrared absorption bands which could be involved in the adsorption process included –OH, -NH2, C=C, C=O, and C-O functional groups, while SEM analysis showed agglomeration of round particles shapes on the surface structure of the biomass. Thus, base-modified sweet potato leaves can be used as an excellent adsorbent to sequester toxic metal ions from wastewater

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Author Biographies

Abimbola A. Ogundiran1, Tai Solarin University of Education, Ijagun, Ogun-State, Nigeria

1Department of Chemical Sciences

Najeem A. A. Babarinde, Olabisi Onabanjo University, Ago- Iwoye, Ogun- State, Nigeria

Department of Chemical Sciences

Edwin A. Ofudje, Department of Chemical Sciences

Mountain Top University, Ibafo, Ogun State, Nigeria

Olusegun O. Ogundiran, Tai Solarin College of Education, Omu-Ijebu, Ogun-State, Nigeria.

Department of Chemistry

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Published

2022-03-28