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Desorption of Pb~(2+) From Phanerochaete chrysosporium Pellets

LI Wei, WU Juan, LI Qing-biao, DENG Xu, LIU Gang (Dept. of Chem. Engin., Xiamen Univ., Xiamen 361005,China)  
The desorption of Pb2+from the mycelial pellets of Phanerochaete chrysosporium with Ph2+ adsorbed on it was investigated. Pb2+ could be easily desorpted by water solution of HCl, HNO,,NaCl,Na2S2O3, EDTA and citric acid among which HNO3 is the best eluent. The effects on desorption of eluent concentration,desorption time and eluent volume were examined. The biggest Pb2+ desorption ratio of more than 98% could be obtained by putting the Pb2+ adsorbed pellets in 50 mL water solution of 0. 1 mol/L HNO, and shaking for 10 h. During 4 biosorptiondesorption circulations, the adsorption capacity of the biomass remainded nearly unchanged, around 95 %.
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