Li Zhijian, Yuan Hongli
College of Biological Sciences, Key Laboratory of Agro-Microbial Resource and Application, Ministry of Agriculture, China Agricultural University, Beijing 100094, People's Republic of China.
Appl Microbiol Biotechnol. 2006 Nov;73(2):458-63. doi: 10.1007/s00253-006-0473-8. Epub 2006 May 31.
Experiments were conducted studying the removal of Cd(2+) from water via biosorption using Rhodotorula sp. Y11. The effects of temperature and initial pH of the solution on biosorption were studied. Caustic and heat treatments showed different influences on the biosorption capacity, and the highest metal uptake value (19.38 mg g(-1)) was obtained by boiling treated yeast cells. The presence of competing cations, such as Ag(+), Cu(2+), and Mg(2+), except Na(+) ions, significantly interfered with the metal uptake. Results indicate that the Langmuir model gave a better fit to the experimental data than the Freundlich equation. The q (10) value was 11.38 mg g(-1) for Cd(2+) uptake by Y11. Chemical modifications of the biomass demonstrated that carboxyl and amide groups play an important role in Cd(2+) biosorption.
进行了利用红酵母Y11通过生物吸附从水中去除Cd(2+)的实验。研究了溶液温度和初始pH对生物吸附的影响。苛性处理和热处理对生物吸附容量有不同影响，通过煮沸处理的酵母细胞获得了最高的金属摄取值（19.38 mg g(-1)）。除Na(+)离子外，竞争性阳离子如Ag(+)、Cu(2+)和Mg(2+)的存在显著干扰了金属摄取。结果表明，与Freundlich方程相比，Langmuir模型更适合实验数据。Y11对Cd(2+)摄取的q(10)值为11.38 mg g(-1)。生物质的化学修饰表明羧基和酰胺基团在Cd(2+)生物吸附中起重要作用。
