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Adsorption of cadmium (II) ions from aqueous solution using palm oil fly ash (POFA)


Citation

Abdul Aziz, Abdul Shukor and Abd Manaf, Latifah and Che Man, Hasfalina and Hamdan, Mas Ernawati (2012) Adsorption of cadmium (II) ions from aqueous solution using palm oil fly ash (POFA). In: International Conference on Agricultural and Food Engineering for Life (Cafei2012), 26-28 Nov. 2012, Palm Garden Hotel, Putrajaya. (pp. 295-303).

Abstract / Synopsis

The aim of this study is to conduct comprehensive studies of Cd (II) ions removal using a low-cost locally available adsorbent which is from agricultural waste. Batch adsorption experiments were conducted for the adsorption of Cd (II) ions from aqueous solution using palm oil fly ash (POFA). The parameters studied include contact time, pH, adsorbent dosage and adsorbate initial concentration. The results showed that the adsorption of Cd (II) ions was very fast initially and equilibration time was achieved after 210 min of contact time. The optimum pH was obtained at pH 9.0. High pH (≥ 9.0) favours the adsorption and removal of Cd (II) ions from aqueous solution. As the adsorbent dosage increased, the removal of Cd increased, whereas the adsorption capacity decreased. Higher initial concentration led to lower removal percentages but higher adsorption capacity. The adsorption behavior of Cd (II) ions fitted Langmuir and Freundlich isotherms well, but followed Langmuir isotherm more precisely, with a maximum adsorption capacity and R2 value of 15.823 mg/g and 1.0 respectively. The applicability of Langmuir isotherm suggested the formation of monolayer coverage of Cd (II) ions at the outer surface of the adsorbent. Therefore, this study demonstrated that POFA could be used successfully for adsorption of Cd (II) ions from aqueous solution.


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Additional Metadata

Item Type: Conference or Workshop Item (Paper)
Divisions: Faculty of Environmental Studies
Publisher: Faculty of Engineering, Universiti Putra Malaysia
Notes: Full text are available at Special Collection Division Office.
Keywords: Adsorption; Palm oil fly ash; Cadmium; Aqueous solution; Isotherm
Depositing User: Samsida Samsudin
Date Deposited: 03 Sep 2014 11:02
Last Modified: 02 Feb 2017 09:27
URI: http://psasir.upm.edu.my/id/eprint/31954
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