Abstract
A rice straw-derived sorbent for the removal of phenanthrene (PHE) was prepared by graft method using hexadecyltrimethyl ammonium bromide (HTAB) as a modifier. The surface morphology, electrostatic, and hydrophobic characteristics of the sorbent altered significantly after modification. The sorption performance of the modified rice straw, including sorption kinetics and isotherms, was evaluated by batch sorption experiments. The sorption process is strongly enhanced by grafted HTAB and could be appropriately described by pseudo-second-order model and linear sorption isotherms. As compared to adsorption, partition plays a more important role in the sorption of PHE to MRS. Correlations between sorbent properties and sorption capacity indicate that (O+N)/C, relative contact angle, and zeta potential are the key factors that govern the PHE sorption behavior.
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