Yu Junxia, Tong Mi, Sun Xiaomei, Li Buhai
College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, P.R. China.
J Hazard Mater. 2007 May 8;143(1-2):277-84. doi: 10.1016/j.jhazmat.2006.09.021. Epub 2006 Sep 10.
The surface of dried biomass of baker's yeast was modified by crosslinking cystine with glutaraldehyde. X-ray photoelectron spectroscopy and microscope were used to characterize the modified biomass. The adsorption capacity of the modified biomass for Cd(2+) and Pb(2+) showed an increase compared with the pristine biomass due to the presence of cystine on the biomass surface. Experimental data showed that the adsorption of the two metal ions increased with time until equilibrium was achieved. The adsorption capacities for Cd(2+) and Pb(2+) were 11.63 and 45.87 mg g(-1), respectively, which were determined from the Langmuir isotherm. The loaded biosorbent was regenerated using HCl solution and could be used repeatedly at six times with little loss of uptake capacity. FTIR spectroscopy revealed that carboxyl, amide, and hydroxyl groups on the biomass surface were involved in the adsorption of Cd(2+) and Pb(2+).
通过胱氨酸与戊二醛交联对面包酵母干生物质的表面进行改性。采用X射线光电子能谱和显微镜对改性生物质进行表征。由于生物质表面存在胱氨酸，改性生物质对Cd(2+)和Pb(2+)的吸附容量与原始生物质相比有所增加。实验数据表明，两种金属离子的吸附量随时间增加直至达到平衡。根据朗缪尔等温线确定，Cd(2+)和Pb(2+)的吸附容量分别为11.63和45.87 mg g(-1)。负载的生物吸附剂用HCl溶液再生，可重复使用6次，吸附容量损失很小。傅里叶变换红外光谱表明，生物质表面的羧基、酰胺基和羟基参与了Cd(2+)和Pb(2+)的吸附。
