Base Treated Cogon Grass (Imperata cylindrica) as an Adsorbent for the Removal of Ni(II): Kinetic, Isothermal and Fixed-bed Column Studies

The adsorption of Ni(II) from aqueous solutions using base treated cogon grass or Imperata cylindrica (NHIC) was performed under batch and column modes. Batch experiments were conducted to determine the factors affecting adsorption such as pH, adsorbent dosage, initial nickel concentration, contact...

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Bibliographic Details
Published in:Clean : soil, air, water air, water, 2010-03, Vol.38 (3), p.248-256
Main Authors: Hanafiah, Megat Ahmad Kamal Megat, Zakaria, Haslizaidi, Ngah, Wan Saime Wan
Format: Article
Language:English
Subjects:
Adsorption
Earth sciences
Earth, ocean, space
Exact sciences and technology
Hydrology
Hydrology. Hydrogeology
Imperata cylindrica
Isotherm
Isotherm
Kinetic
Kinetic
Nickel
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Summary:The adsorption of Ni(II) from aqueous solutions using base treated cogon grass or Imperata cylindrica (NHIC) was performed under batch and column modes. Batch experiments were conducted to determine the factors affecting adsorption such as pH, adsorbent dosage, initial nickel concentration, contact time and temperature. The fixed‐bed column experiment was performed to determine the practical applicability of NHIC and to obtain the breakthrough curve. Adsorption was fast as equilibrium was achieved within 60 min, and was best described by the pseudo second order model. According to the Langmuir model, a maximum adsorption capacity of 6.96 mg/g was observed at pH 5 and at a temperature of 313 K. Thermodynamic parameters such as ΔG0, ΔH0 and ΔS0 were calculated, and indicated that adsorption was a spontaneous and endothermic process. The mechanistic pathway of Ni(II) uptake was examined by Fourier transform infrared (FTIR) spectroscopy, scanning electron microscopy (SEM) and energy dispersive X‐ray (EDX) spectroscopy. The Thomas and Yoon‐Nelson models were used to analyze the fixed‐bed column data. Research Articles: Cogon grass and other weeds are abundant and have no economic value, so they could be used for the removal of harmful pollutants from aqueous solutions. The adsorption of Ni(II) using cogon grass is performed under batch and column modes. Batch experiments are conducted to determine the factors affecting adsorption, and then fixed‐bed column experiments are performed to determine the practical applicability of their use.
ISSN:1863-0650
1863-0669
DOI:10.1002/clen.200900206