Studies On Adsorption Of The Rear Earth Ions By Phanerochaete Chrysosporium

Phanerochaete chrysosporium210 which has high adsorption capacity of La3+ was screened from white rot fungi.At present, the action mechanism of biosorbent has not been studied indetail. Based on reviewing theories and techniques of heavy metal removal,the absorbing capability of Phanerochaete chrysosporium210 toREE is studied.The adsorption experiments of Phanerochaete chrysosporium210 (cultivation 72h) to REE are done. The results indicated that the pH, adsorptive time, biomass concentration and REE concentration were crucial factors for biosorption of REE The suitable pH was 7, The optimal adsorptive time is 2h, and biomass concentration 3mg/50ml(dry weight). When the concentration of REE is 40mg/L, adsorption capacity of REE is the largest.Desorption and pretreatment test of Phanerochaete chrysosporium210 indicate that it has a better desorption affect by joining the Citrate acid, and EDTA. Preatreatment by acid of Phanerochaete chrysosporium210 can increase the biosorption capacity a little. And the biosorption capacity on Phanerochaete chrysosporium210 by other pretreatments decreases.Comparing the TEM characterization of Phanerochaete chrysosporium210 before &after adsorbing La3+, lots of wite bright spots ware found in the cell wall of after adsorbing Phanerochaete chrysosporium210 ,So we guess that Phanerochaete chrysosporium210 adsorbed La3+.Tests were done with solution containing one REE at a time ,accumulation ability of Phanerochaete chrysosporium was quite diffenert .the selective biosorption with mixture REEs sulution showed Phanerochaete chrysosporium210 preferentially biosorpted Lu,Sm,Eu.the biosorption difference is not obvious for other REEs.So we can say Phanerochaete chrysosporium210 can accumulate and separate REEs.Biosorption kinectic results of Phanerochaete chrysosporium210 showed that the biosorption involved two phases. The first phase was very quick The other was a very slow process and the adsorption uptake capacity increased very slowly.The adsorption process tallies with Langmuir model and Freundlich equation. the Langmuir model well fitted this experimental data. The adsorption kinetics of REE by Phanerochaete chrysosporium210 is investigated. The result shows that adsorption process obeys the pesudo second-order kinetic model.