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•The conversion of sewage sludges into biochar increased their sorption capacity.•Pyrene was adsorbed better on the tested materials than phenanthrene.•Sewage sludge-derived biochars can be a good adsorbent for PAHs removal from water.
The present study investigated the sorption of phenanthrene (PHE) and pyrene (PYR) by sewage sludges and sewage sludge-derived biochars. The organic carbon normalized distribution coefficient (logKOC for Cw=0.01 Sw) for the sewage sludges ranged from 5.62Lkg−1 to 5.64Lkg−1 for PHE and from 5.72Lkg−1 to 5.75Lkg−1 for PYR. The conversion of sewage sludges into biochar significantly increased their sorption capacity. The value of logKOC for the biochars ranged from 5.54Lkg−1 to 6.23Lkg−1 for PHE and from 5.95Lkg−1 to 6.52Lkg−1 for PYR depending on temperature of pyrolysis. The dominant process was monolayer adsorption in the micropores and/or multilayer surface adsorption (in the mesopores), which was indicated by the significant correlations between logKOC and surface properties of biochars. PYR was sorbed better on the tested materials than PHE.