Adsorption and equilibrium characteristics of cadmium and nickel on palm oil fuel ash (non-treated and treated with nitric acid)

Lo, Yun Wei (2010) Adsorption and equilibrium characteristics of cadmium and nickel on palm oil fuel ash (non-treated and treated with nitric acid). Universiti Malaysia Sabah. (Unpublished)


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Palm oil fuel ash, POFA, an abundantly available throwaway waste from palm oil industry in Malaysia, has currently investigated to be an Ideal adsorbent in the wastewater treatment processes. The experiment for the adsorption of NI (II) and Cd (II) ions from aqueous solutions on non-treated and treated POFA was conducted to investigate the initial ions concentration (2-10 µg mL�¹), contact time (5-90 min) and binary components system. The equilibrium adsorption data were analyzed by using the Langmuir and Freundlich Isotherms. Both isotherms were best fit to the experimental data for non-treated and treated POFA. The maximum adsorption capacity of Ni (n) and Cd (II) on treated POFA were 526.32 µg g�¹ and 769.23 µg g�¹respectively which were higher than the adsorption of NI (Il) and Cd (II) on non-treated POFA which were 500.00 µg�¹ and 714.29 µg�¹ respectively. The experimental data were also tested in terms of adsorption kinetics by using pseudo-first order, pseudo-second order and Intra-particle diffusion. The adsorption of Ni (II) and Cd (II) Ions on non-treated and treated POFA followed well to the pseudo-second order kinetic model. The amount of adsorption for Ni (II) and Cd (II) on treated POFA was always higher than non-treated POFA. The adsorption capacity of Cd (II) was also higher than Ni (II) for the binary components system and was in agreement with the single component adsorption data. The binary components system was generally found to be antagonistic, which stated that the amount of adsorption in binary components system was lower than the amount of adsorption In single component system. Based on all the results, POFA could be used as an alternative low cost adsorbent to effectively adsorb Ni (II) and Cd (II) Ions from wastewater

Item Type: Academic Exercise
Uncontrolled Keywords: Palm oil fuel ash (POFA), wastewater treatment processes, aqueous solutions, Langmuir Isotherms, Freundlich Isotherms, binary amponents system
Subjects: T Technology > TP Chemical technology
Divisions: SCHOOL > School of Science and Technology
Depositing User: Unnamed user with email
Date Deposited: 07 Sep 2015 05:51
Last Modified: 25 Oct 2017 06:23

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