The characteristics of phenanthrene biosorption by chemically modified biomass of Phanerochaete chrysosporium

The natural (S-0) and chemically modified Phanerochaete chrysosporium including the methylation of amino groups (S-1), acetylation of hydroxyl groups (S-2), lipid removal (S-3), esterification of carboxyl groups (S-4), and base hydrolysis (S-5) were characterized, and their sorption for phenanthrene (PHE) was investigated. The sorption isotherm of PHE on natural biomasses was apparently linear, while it was nonlinear for the modified ones. The partition coefficient (K-d ) describing the sorption affinity of PHE by biomasses followed the order of S-0 (9.24 L g(-1)) > S-5 (8.94 L g(-1)) > S-1 (7.13 L g(-1)) > S-2 (6.97 L g(-1)) > S-3 (6.38 L g(-1)) > S-4 (3.51 L g(-1)) and decreased as temperature increased. The PHE adsorption fitted well to the pseudo-second-order kinetic model, and the sorption capacity was in the order of S-5 (2041.5 mu g g(-1)) > S-0 (1768.8 mu g g(-1)) > S-2 (1570.9 mu g g(-1)) > S-1 (1552.9 mu g g(-1)) > S-3 (1346.4 mu g g(-1)) > S-4 (991.0 mu g g(-1)). Moreover, the pi-pi and electron donor-acceptor interactions may govern PHE sorption which processed spontaneously and exothermally. The natural and modified biomasses, especially the base hydrolysis treated ones, were economical and effective biosorbents for PHE removal.