Enhanced and selective adsorption of Pb2+ and Cu2+ by EDTAD-modified biomass of baker’s yeast
2007; Elsevier BV; Volume: 99; Issue: 7 Linguagem: Inglês
10.1016/j.biortech.2007.04.038
ISSN1873-2976
AutoresJunxia Yu, Mi Tong, Xiaomei Sun, Buhai Li,
Tópico(s)Phosphorus and nutrient management
ResumoEnhanced and selective removal of Pb2+ and Cu2+ in the presence of high concentration of K+, Na+, Ca2+ and Mg2+ were achieved by adsorption on biomass of baker's yeast modified with ethylenediaminetetraacetic dianhydride (EDTAD). The modified biomass was found to have high adsorption capacities and fast rates for Pb2+ and Cu2+, and it also displayed consistently high levels of metal uptake over the pH range from 2.7 to 6.0. From Langmuir isotherm, the adsorption capacities for Pb2+ and Cu2+ were found to be 192.3 and 65.0 mg g(-1), respectively, which are about 10 and 14 times higher than that of the unmodified biomass. Competitive biosorption experiments showed that the co-ions of K+, Na+, Ca2+ and Mg2+ had little effects on the uptake of Pb2+ and Cu2+ even at the concentration of 1.0 mol L(-1). The adsorbed Pb2+ and Cu2+ on the modified biomass could be effectively desorbed in an EDTA solution, and the regenerated biomass could be reused repeatedly with little loss of the adsorption capacity.
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