Adsorption of Ni(II) and Cd(II) Ions from Aqueous Solutions by Modified Surface of Typha latifolia L. Root, as an Economical Adsorbent

Document Type : Research Paper

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Abstract

The modified surface of Typha latifolia L. root (MSTL), as an alternative economical adsorbent, was
used for the removal of Ni (II) and Cd(II) ions from aqueous solutions. The effect of initial pH, initial
concentration of metal ion, and contact time was investigated in a batch system at room temperature.
The kinetics data could be fitted well by pseudo-second-order model with correlation coefficient
values greater than 0.99. The mechanism of adsorption process was tested by fitting the experimental
data by intraparticle diffusion kinetic and Boyd kinetic equations. The adsorption data could be fitted
well by Langmuir and Freundlich adsorption isotherms. The maximum adsorption capacity of MSTL
was determined to be 37.31 mg g-1 for Ni2+ and 28.90 mg g-1 for Cd2+ at room temperature when the
initial concentration of both metal ion was 100 mg/L, and the pH of the solution was 5.00 and 4.00
for Ni2+ and Cd2+, respectively. It has been suggested that the MSTL can be successfully applied for
the removal of toxic heavy metal ions such as Ni2+ and Cd2+ from aqueous solutions.

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