Utilization of wood chips as a source of active carbon for removal of methylene blue from aqueous solution (H3P04)

Ng, An Chee (2006) Utilization of wood chips as a source of active carbon for removal of methylene blue from aqueous solution (H3P04). Universiti Malaysia Sabah. (Unpublished)

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Abstract

The porosity and adsorption capacity of active carbons depended on the nature of the raw materials. Wood chips have been used as a raw material to produce active carbon. Active carbons have been prepared by chemical activation of wood chips with H₃PO₄ in order to show the effect of variables such as concentration, time and temperature of the resulting active carbons. The adsorption capacity was demonstrated by the isotherms of methylene blue from aqueous solution. Different concentrations of phosphoric acid were applied to all active carbons samples. Phosphoric acid activation was used to produce high porosity and high surface area active carbons. Experiments were conducted in lab scale muftle furnace in a two stage self-generated method covering process parameters such as concentration, activation time and temperature. The resulting active carbons were characterized by the removal of methylene blue from aqueous solution. Adsorption isotherms of methylene blue from aqueous solution onto active carbons were investigated. The Freundlich model is suited to fit the adsorption data according to correlation coefficient. From all active carbon samples, AK8 shows good correlation coefficient with R²= 0.91. The kinetic adsorption of methylene blue on all carbons follows a pseudo second- order equation. Surface morphology carried out on the wood chips based active carbons were observed by scanning electron microscope. Infrared spectroscopy showed the chemical structure of the adsorbent materials. As a result, the adsorption capacity of active carbons was differentiate with concentration, time and temperature.

Item Type: Academic Exercise
Uncontrolled Keywords: adsorption capacity, porosity, carbon, wood chip, phosphoric acid, Freundlich model, temperature
Subjects: T Technology > TP Chemical technology
Divisions: SCHOOL > School of Science and Technology
Depositing User: MDM SITI AZIZAH IDRIS
Date Deposited: 19 Feb 2014 05:48
Last Modified: 12 Oct 2017 00:13
URI: http://eprints.ums.edu.my/id/eprint/8249

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