Author(s)

Siti Najiah Mohd Yusoff, Azlan Kamari, Wiwid Pranata Putra, Che Fauziah Ishak, Azmi Mohamed, Norhayati Hashim, Illyas Md Isa

1Department of Chemistry, Faculty of Science and Mathematics, Universiti Pendidikan Sultan Idris, Tg. Malim, Perak, Malaysia 2Nanotechnology Research Centre, Faculty of Science and Mathematics, Universiti Pendidikan Sultan Idris, Tg. Malim, Perak, Malaysia.
Department of Chemistry, Faculty of Science and Mathematics, Universiti Pendidikan Sultan Idris, Tg. Malim, Perak, Malaysia.
Department of Land Management, Faculty of Agriculture, Universiti Putra Malaysia, Serdang, Selangor, Malaysia.

The feasibility of durian tree sawdust (DTS), coconut coir (CC) and oil palm empty fruit bunch (EFB) as low-cost biosorbents for the removal of Cu(II), Pb(II) and Zn(II) ions from aqueous solutions was investigated. The effects of solution pH and initial metal concentration on adsorption capacity were examined in batch experiments. The affinity and the adsorption capacity of DTS, CC and EFB were evaluated. The adsorption behaviour of Cu(II), Pb(II) and Zn(II) ions onto DTS, CC and EFB was described using Freundlich and Langmuir isotherm models. The separation factor (R_L) analysis suggests that the removal of metal ions onto three agricultural wastes studied was favourable. The maximum adsorption capacities (Q) estimated from the Langmuir isotherm model for Cu(II), Pb(II) and Zn(II) were 18.42, 20.37 and 22.78 mg/g for DTS, 18.38, 37.04 and 24.39 mg/g for CC, and 26.95, 37.59 and 21.19 mg/g for EFB, respectively. The characterisation studies were carried out using Scanning Electron Microscope (SEM), Energy Dispersive X-ray Spectrometer (EDX) and Fourier Transform Infrared Spectrometer (FTIR). The surface morphology of the biosorbents changed significantly following interaction with metal ions. The primary adsorption mechanism was complexation between metal ions and binding sites of biosorbents. Both hydroxyl and amine groups are the main binding sites in DTS, CC and EFB.

Adsorption; Characterisation; Metals; Durian Tree Sawdust; Coconut Coir; Oil Palm Empty Fruit Bunch

Yusoff, S. , Kamari, A. , Putra, W. , Ishak, C. , Mohamed, A. , Hashim, N. and Isa, I. (2014) Removal of Cu(II), Pb(II) and Zn(II) Ions from Aqueous Solutions Using Selected Agricultural Wastes: Adsorption and Characterisation Studies. Journal of Environmental Protection, 5, 289-300. doi: 10.4236/jep.2014.54032.