Adsorption performance and mechanism of a low-cost biosorbent from spent seedcake of Calophyllum inophyllum in simultaneous cleanup of potentially toxic metals from industrial wastewater

Abstract Among the contaminants that are frequently associated with industrial wastewaters, potentially toxic metals are of great health concern because they are non-biodegradable and can be transformed by biochemical processes to more poisonous metal-organic complexes. Thus, safe and adequate disposal of wastewater containing these metals into the environment remains a front-burner challenge. This study investigated metal ions removal from wastewaters using adsorbents generated from the Spent Seedcake of Calophyllum inophyllum (SSCI) as an alternative low-cost adsorbent. Batch adsorption process was employed to demonstrate the adsorption capacity for the multi-component removal of Pb(II), Cd(II) and Zn(II) at optimized experimental conditions. Carbonization and microwaving of the biosorbent produced an optimal performance for the uptake of the metals at solution pH of 9, temperature of 30 °C, dosage, 10 g/L and 60 min equilibrium time. The maximum adsorption capacities of the biosorbent were 52.63, 51.28 and 17.99 mg/g for Pb2+, Cd2+and Zn2+ respectively. The adsorption kinetics of the metals unto the biosorbent was adequately described by a pseudo-second-order kinetic model with positive enthalpy (ΔH) indicating the endothermic nature of the adsorption process while the negative values of the Gibbs free energy (ΔG) confirmed the spontaneity of the adsorption process for all the metals studied.The effectiveness of the biosorbent was tested with real wastewater samples and a removal of the metals between 55–71% was achieved.

• Publication year

  2019

• Venue

  Journal of Environmental Chemical Engineering

• Publication date

  2019-10-01

• Fields of study

  Chemistry, Environmental Science

• Identifiers
  DOI 10.1016/J.JECE.2019.103317
• External record

  Open on Semantic Scholar

• Source metadata

  Semantic Scholar

• No claims are published for this paper.

• No concepts are published for this paper.

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