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Adsorpton of Phenol from Aqueous Solution by Rice Husk Ash

M. T. Uddin
Department of Chemical Engineering and Polymer Science; Shahjalal University of Science and Technology; Sylhet-3114; Bangladesh

M. Z. Abedin
Department of Chemical Engineering and Polymer Science; Shahjalal University of Science and Technology; Sylhet-3114; Bangladesh

M. A. Islam
Department of Chemical Engineering and Polymer Science; Shahjalal University of Science and Technology; Sylhet-3114; Bangladesh

M. S. Islam
Department of Chemical Engineering and Polymer Science; Shahjalal University of Science and Technology; Sylhet-3114; Bangladesh

Abstract/ Executive Summary:

The adsorption of phenol on rice husk ash was investigated using a batch adsorption technique. The effect of various experimental parameters, such as pH, adsorbent dosage, initial phenol concentration and contact time, were also investigated. The amount of phenol adsorbed was increased with the increase in initial phenol concentration and contact time and decreased with increasing adsorbent dosage. Equilibrium data were fitted to the Freundlich and Langmuir isotherm equations and the equilibrium data were found to be well represented by the Langmuir isotherm equation. The monolayer sorption capacity of rice husk ash for phenol sorption was found to be 18.62 mg/g. The sorption was analyzed using pseudo-first-order and pseudo-second-order kinetic models and the sorption kinetics was found to follow a pseudo-second- order-kinetic model.

Keywords: Adsorption; Rice husk ash; phenol; pH; Kinetics; Equilibrium

Location: Department of Chemical Engineering and Polymer Science, Shahjalal University of Science and Technology; Sylhet-3114; Bangladesh

Start Date:

End Date:

Program Area: Risk Management in Agriculture

Commodity: Rice

Objectives:

To evaluate rice husk ash as an adsorbent for the removal of phenol from its aqueous solutions. to evaluate the sorption capacity of the adsorbent.

Methodology:

The rice husk was obtained from local rice mills. The collected materials were then washed with distilled water for several times to remove all the dirt particles. The materials were then dried in a hot air oven at 100⁰°C for 8 h. The dried materials were then burned and grounded. The ground materials were then stored in plastic bottle for use. A stock solution of 1000 mg/I phenol was prepared by dissolving l.0 gm of analytical reagent grade phenol (Sigma Chemical Co., Germany) in 1 L distilled water. The test solutions of desired concentration were then prepared by diluting the stock solution. The pH of the solution was adjusted to the required value with 0.IN HCl and 0.1 N NaOH solutions. Effect of pH: The effect of pH on the amount of phenol removal was analyzed over the pH range from 2.5 to 10. In this study, 150 ml of phenol solution of 200 mg/L was taken in stopper plastic conical flask and was agitated with l.0 g of rice husk ash for 5 h using flash shaker at room temperature (27±2 ⁰C), at constant oscillation of 400 osc/min. The samples were then centrifuged, and the left out concentration in the supernatant solution were analyzed using a UV/VIS spectrometry by monitoring the absorbance changes at a wavelength of maximum absorbance (505 nm). Effect of adsorbent dosage: The effect of rice husk ash on the amount of phenol adsorbed was obtained by agitating 150 ml of phenol solution of concentration 100 mg/L with different weighed amounts (0.2-2.2 gm) of rice husk ash for 5 h using a flash shaker at a constant oscillation of 400 osc/min. After equilibrium, the samples were analyzed for left out concentration, as said before. Adsorption equilibrium: Equilibrium experiments were carried out by contacting 1 g of rice husk ash with 150 ml of phenol solution of different initial concentration, 40, 50, 60, 70, 80 and 90 mg/L. The samples were then agitated for 5 h at a constant oscillation of 400 osc/min. After equilibrium, the samples were analyzed for left out concentration, as said before. Adsorption kinetics: Adsorption kinetics experiments were carried out by contacting 150 ml phenol solution of different initial concentrations ranging from 50 to 70 mg/L with 1.0 g rice husk ash in a 250 ml stoppered conical flask. The samples then shaken at a constant oscillation speed of 400 osc/min for 5 h. The samples were then collected at different time intervals and analyzed for left out concentration, as said before.

Source of Information: Bangladesh Journal of Environmental Science. Vol 12, (No-2), pp: 344-347, December-2006

Article Link (Online Journal):

Funding Source:

1. Government

Budget:

Total Budget (Tk.) :

Achievement/Findings:

Equilibrium data were fitted to the Freundlich and Langmuir isotherm equations and the equilibrium data were found to be well represented by the Langmuir isotherm equation. The monolayer sorption capacity of rice husk ash for phenol sorption was found to be 18.62 mg/g. The sorption was analyzed using pseudo-first-order and pseudo-second-order kinetic models and the sorption kinetics was found to follow a pseudo-second- order-kinetic model.

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