Surface modification of Corynebacterium glutamicum for enhanced Reactive Red 4 biosorption.
Surface modification of Corynebacterium glutamicum for enhanced Reactive Red 4 biosorption.
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DOI：
10.1016/j.biortech.2008.07.053
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发表时间：
2009-02
影响因子：
11.4
通讯作者：
Juan Mao;S. Won;K. Vijayaraghavan;Y. Yun
中科院分区：
文献类型：
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作者：
Juan Mao;S. Won;K. Vijayaraghavan;Y. Yun
研究了聚乙烯亚胺（PEI）交联谷氨酸棒杆菌提高其吸附活性染料能力的可能性。C.发现谷氨酸与活性染料阴离子静电相互作用。因此，与PEI交联的生物质增强了伯胺和仲胺基团，从而增加了活性染料的生物吸附。pH边缘实验表明，酸性条件下，由于质子化的胺基，被发现有利于活性红4（RR 4）的生物吸附。根据Langmuir模型，PEI修饰的C.谷氨酸棒杆菌对RR 4的最大吸收量为485.1mg/g，而粗棒杆菌为171.9mg/g。谷氨酸。动力学实验表明，化学改性降低了吸附速率。解吸在pH 9下成功，生物质成功再生并重复使用四个循环。
This study reports the possibility of enhancing the reactive dye biosorption capacity of Corynebacterium glutamicum via its cross-linking with polyethylenimine (PEI). The amine groups in the cell wall of C. glutamicum were found to electrostatically interact with reactive dye anions. Thus, cross-linking the biomass with PEI enhanced the primary and secondary amine groups, thereby increased the biosorption of reactive dye. The pH edge experiments revealed that acidic conditions, due to protonation of the amine groups, were found to favor Reactive Red 4 (RR 4) biosorption. According to the Langmuir model, the PEI-modified C. glutamicum recorded a maximum RR 4 uptake capacity of 485.1mg/g compared to 171.9mg/g of the raw C. glutamicum. The kinetic experiments revealed that chemical modification decreased the rate of biosorption. Desorption was successful at pH 9, with the biomass successfully regenerated and reused over four cycles.