Sorption of Phenanthrene onto Diatomite under the Influences of Solution Chemistry: A Study of Linear Sorption based on Maximal Information Coefficient

S. Zhao; W. W. Huang; X. Q. Wang; Y. R. Fan; C. J. An

doi:10.3808/jei.201600329
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Sorption of Phenanthrene onto Diatomite under the Influences of Solution Chemistry: A Study of Linear Sorption based on Maximal Information Coefficient

S. Zhao^{1,2 *}, W. W. Huang^{3 *}, X. Q. Wang², Y. R. Fan², and C. J. An²

Shandong Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, Jinan 250100, China
Institute for Energy, Environment and Sustainable Communities, University of Regina, Regina, SK S4S 0A2, Canada
Department of Civil Engineering, McMaster University, Hamilton, Ontario L8S 4L7, Canada

*Corresponding author. Tel: +86 053258630956; fax: +86 053258630907. E-mail address: szhao@sdu.edu.cn (S. Zhao).
*Corresponding author. Tel.: +1 306 5913508; E-mail address: huangw23@mcmaster.ca (W. W. Huang)

Abstract

The effectiveness of diatomite as the low-cost sorbent in the removal of polycyclic aromatic hydrocarbons (PAHs) from water was investigated. The effects of ionic strength, pH, dissolved organic matter, and temperature on sorption of phenanthrene (PHE) to two types of diatomite clay (DM 545 and DM 577) were systematically studied. The maximal information coefficient (MIC) was calculated to reveal the linearity/nonlinearity in the sorption process under the influences of aqueous chemistry parameters. Results indicated that the solution parameters played an essential role in the PHE sorption behavior at the aqueous/diatomite interface. The sorption isotherms of PHE on diatomite at different temperatures could well fit the Freundlich equation. Thermodynamic studies confirmed that the sorption behavior of PHE on diatomite was spontaneous and exothermic from 283 to 303 K. The calculation of MIC revealed the linear relationship between the aqueous PAHs and sorbed PAHs at the water/diatomite interface. The results can be used to support the potential application of diatomite for the treatment of PAH-contaminated effluents.

Keywords: phenanthrene, linear sorption, diatomite, maximal information coefficient

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