Fungal biomass with grafted poly(acrylic acid) for enhancement of Cu(II) and Cd(II) biosorption
Fungal biomass with grafted poly(acrylic acid) for enhancement of Cu(II) and Cd(II) biosorption
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DOI：
10.1021/la047349a
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发表时间：
2005-06-21
期刊：
影响因子：
3.9
通讯作者：
Ting, YP
中科院分区：
文献类型：
--
作者：
Deng, SB;Ting, YP
通过在臭氧处理过的生物质表面接枝丙烯酸(AAc)，对产黄青霉的生物量进行了改性。由于生物质表面存在大量的羧基，尤其是在NaOH作用下将羧酸基转化为羧酸根离子时，其对铜和镉的吸附容量显著增加。用Langmuir等温式模拟，其对铜和镉的吸附容量分别为1.70和1.87 mmolg-1。负载的生物吸附剂用盐酸溶液再生，并重复使用5个循环，第二个循环后几乎没有吸收能力的损失。两种金属的吸附均与时间有关，吸附动力学符合准二级动力学方程。用Freundlich、Langmuir、Temkin和Dubinin-Redushkevich等温式对吸附等温线进行了模拟，热力学参数计算表明，在所施加的条件下，吸附是自发的和吸热的，生物体对这两种金属的吸附亲和力相似。傅立叶变换红外光谱和X射线光电子能谱表明，微生物表面的羧基、酰胺基和羟基参与了铜和镉的吸附，离子交换和络合作用主导了吸附过程。
The biomass of Penicillium chrysogenum was modified by graft polymerization of acrylic acid (AAc) on the surface of ozone-pretreated biomass. The sorption capacity for copper and cadmium increased significantly as a large number of carboxyl groups were present on the biomass surface, especially when the carboxylic acid group was converted to carboxylate ions using NaOH. When modeled using the Langmuir isotherm, the sorption capacities were 1.70 and 1.87 mmol g(-1) for copper and cadmium, respectively. The loaded biosorbent was regenerated using HCl solution and used repeatedly over five cycles with little loss of uptake capacity beyond the second cycle. The sorption of the two metals was time-dependent, and the kinetics fitted the pseudo-second-order equation well. The Freundlich, Langmuir, Temkin, and Dubinin-Redushkevich isotherms were used to model the metal sorption isotherms, and the thermodynamic parameters calculated show that the sorption was spontaneous and endothermic under the condition applied and that the biomass has similar sorption affinities for the two metals. Fourier transform infrared and X-ray photoelectron spectroscopy reveal that carboxyl, amide, and hydroxyl groups on the biomass surface were involved in the sorption of copper and cadmium and ion exchange and complexation dominated the sorption process.