Abstract
A novel extracellular biopolymer (PFC02) was prepared from Pseudomonas fluorescens C-2 for the removal of nickel(II) ions from aqueous solution. The prepared PFC02 was characterised by Fourier-transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM) coupled with energy dispersive X-ray spectrometer (EDS) analysis. The maximum nickel(II) adsorption was obtained at pH 4.5. The Langmuir isotherm better fitted the adsorption data with the monolayer adsorption capacity of 88.49 mg g–1 at 25°C. The kinetic rates were best fitted to the pseudo-second-order model. Both light and heavy metal ions decreased nickel(II) binding by PFC02, with iron ions and aluminium ions showing a more pronounced effect than sodium ions and potassium ions, while the interfering heavy metal ions followed the order: copper(II) > cadmium(II) > zinc(II). The prepared PFC02 can be used as an effective, low-cost promising sorbent for the removal of nickel from aqueous solution.
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