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Studies on Zn (II) Ion Adsorption by Rice Husks Digested with Nitric Acid

Teo , Ching-synn (2004) Studies on Zn (II) Ion Adsorption by Rice Husks Digested with Nitric Acid. Universiti Teknologi Petronas. (Unpublished)

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Abstract

The use of rice husks as activated carbon as a potential adsorbent for the removal of zinc from aqueous solution has been investigated. The objectives of this experiment are to create a highly available, effective and inexpensive adsorbent for adsorption process in removal of metal ions that present in waste water streams. Besides that, characteristics of rice husk as adsorbent are carefully studied. Due to health, safety and environment concerns, highly toxic metals that present in waste stream are dangerous and required to be eliminated through a chemical process called adsorption. Generally, adsorption is done in the plant using adsorption column, conventional methods such as ion exchange process, and other biological processes. Since, the conventional method consumes a lot of money hence, a newer and cost effective method is applied by using agriculture wastes which face highly disposal problem or other activated carbon from a variety of materials such as peach stones, almond shells, peanut skins and others. This laboratory scale experiment was conducted by adsorbing 25 ml of 25 ppm of Zn2+ solution with digested and carbonized rice husk into 500 ml conical flask. Agitation of sample was operated at 150 rpm, 2 hours at room temperature. Adsorption sample was filtered and the filtrate solution was tested on Atomic Absorption Spectrophotometer (AAS) to determine concentration left after adsorption. The AAS results were analyzed basedon various factors tested. Brunauer - Emmet - Teller(BET) method was studied and Scanning Electron Micrscopy (SEM) was employed to characterize the rice husk fibrous structures. Scopes of this experiment which are on the effects of various factors, e.g., nitric acid concentration, carbonization temperature and time, particle size of rice husk, rice husk loading, adsorption contact time and shaker speed on adsorption capacity, were quantitatively determined. Nitric acid concentration effect at 1.0Mfor acid treatment, 500 °C and 1 hour carbonization prove the highest adsorption capacity. Particle size at 0.500 mm has the greatest effect to adsorb Zn2+ in terms of surface area and engineering economic analysis. Higher mass loading was found to adsorb more Zn2+ quantity and at 30th minute, adsorption equilibrium had been achieved. During adsorption experiment, shaker speed of 200 rpm recorded the highest Zn2+ uptake. The two-parameter equilibrium models (Langmuir and Freundlich equations) were discussed. It was found that Freundlich best fitted on the experiment. Overall, rice husk has a potential for removing Zn2+ in waste stream but is required to improve further on the rice husk preparation. Future work discussed is required to be alarmed for the betterment of this process technology.

Item Type: Final Year Project
Academic Subject : Academic Department - Chemical Engineering - Ionic Liquid
Subject: T Technology > TP Chemical technology
Divisions: Engineering > Chemical
Depositing User: Users 2053 not found.
Date Deposited: 30 Sep 2013 16:55
Last Modified: 25 Jan 2017 09:47
URI: http://utpedia.utp.edu.my/id/eprint/7957

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