Yu Junxia, Tong Mi, Sun Xiaomei, Li Buhai
College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, PR China.
Bioresour Technol. 2008 May;99(7):2588-93. doi: 10.1016/j.biortech.2007.04.038. Epub 2007 Jun 13.
Enhanced 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.
通过用乙二胺四乙酸二酐（EDTAD）改性的面包酵母生物质吸附，在高浓度的K +、Na +、Ca2 +和Mg2 +存在下实现了对Pb2 +和Cu2 +的增强选择性去除。发现改性生物质对Pb2 +和Cu2 +具有高吸附容量和快速吸附速率，并且在2.7至6.0的pH范围内也始终显示出高水平的金属吸收。根据朗缪尔等温线，发现对Pb2 +和Cu2 +的吸附容量分别为192.3和65.0 mg g（-1），分别比未改性生物质高约10倍和14倍。竞争性生物吸附实验表明，即使在1.0 mol L（-1）的浓度下，K +、Na +、Ca2 +和Mg2 +的共存离子对Pb2 +和Cu2 +的吸收影响很小。改性生物质上吸附的Pb2 +和Cu2 +可以在EDTA溶液中有效地解吸，并且再生的生物质可以重复使用，吸附容量几乎没有损失。
