International Journal of Applied Science and Engineering
Published by Chaoyang University of Technology

Jih-Hsing Changa,*, Ching-Lung Chena, Amanda V. Ellisb, and Cheng-Hung Tungc

a Department of Environmental Engineering and Management, Chaoyang University of Technology, 168 Jifong E. Rd., Wufong District, Taichung, Taiwan, R.O.C.
b Centre for Nanoscale Science and Technology, School of Chemical and Physical Sciences, Flinders University, Sturt Rd, Bedford Park, Australia
c Department of Environmental Engineering, National Chung Hsing University, 250, Kuo Kuang Road, Taichung, Taiwan, R.O.C.

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ABSTRACT

This work explores the use of chitosan as an adsorbent of common chlorinated organics in waste water, namely 4-chlorophenol and tetrachloroethylene. We use both isothermal adsorption equilibrium and dynamic adsorption experiments to describe the phenomena of adsorption at pH 4, 5, 6, 7 and 9. Results show that 4-chlorophenol is adsorbed the greatest at pH 6 while tetrachloroethylene is adsorbed the greatest at pH 4. The Langmuir constant b values range from 0.00003 to 0.00012 and 0.00001 to 0.00007 for 4-chlorophenol and tetrachloroethylene, respectively, and overall it appeared that the binding energy of 4-chlorophenol to chitosan is higher than that of tetrachloroethylene. Dynamic adsorption experiments show that the adsorption of 4-chlorophenol on chitosan follows a second order process while tetrachloroethylene follows a first order process, where the external mass transport coefficient of 4-chlorophenol and tetrachloroethylene ranged from 0.081 - 0.755 and 0.009 - 0.285, respectively. Additionally, the internal pore diffusion rate of 4-chlorophenol inside the micropores of chitosan is shown to be approximately 2.5 times that of tetrachloroethylene.


Keywords: Department of Environmental Engineering, National Chung Hsing University, 250, Kuo Kuang Road, Taichung, Taiwan, R.O.C.


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ARTICLE INFORMATION

Received: 2012-06-19
Revised: 2012-09-19
Accepted: 2012-10-19
Available Online: 2012-12-01


Cite this article:

Chang, J.-H., Chen, C.-L., Ellis, A.V., Tung, C.-H. 2012. Studies of chitosan at different pH’s in the removal of common chlorinated organics from wastewater. International Journal of Applied Science and Engineering, 10, 293–306. https://doi.org/10.6703/IJASE.2012.10(4).293

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