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Biosorption of Heave Metals by Rhizopus Nigricans.

Tu Juan et al.(Institute of Molecular Biology,Nankai Univ,Tianjin 300071)  
Adsorption properties of the nonliving nigricans for metal ions were studied.The effects of pH,concentration and co-ions on the adsorption efficiency were examined.From the isotherms,the adsorption equilibrium constant(b)and the maximum adsorption capacity(q∞)in the Langmuir equation and the experimental constant(K) and (l/ n )in Freundlich equation were determined.Adsorption properties of treated and untreated R.nigricans were compared. The results show that the optimum pH value was between 3 and 6.5,the maximum pb2+ uptake capacity was 88mg/ g.R.nigricans can be eluted and regenerated with a 0. 5mol/L HCI solution and a NaOH solution.
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