Espinosa-Ortiz Erika J, Shakya Manisha, Jain Rohan, Rene Eldon R, van Hullebusch Eric D, Lens Piet N L
Department of Environmental Engineering and Water Technology, UNESCO-IHE Institute for Water Education, P.O. Box 3015, 2601 DA, Delft, The Netherlands.
Department of Chemistry and Bioengineering, Tampere University of Technology, Korkeakoulunkatu 10, FI-33720, Tampere, Finland.
Environ Sci Pollut Res Int. 2016 Nov;23(21):21619-21630. doi: 10.1007/s11356-016-7333-6. Epub 2016 Aug 13.
The use of a novel hybrid biosorbent, elemental selenium nanoparticles (nSe) immobilized in pellets of Phanerochaete chrysosporium, to remove Zn from aqueous solutions was investigated. Fungal pellets containing nSe (nSe-pellets) showed to be better biosorbents as they removed more Zn (88.1 ± 5.3 %) compared to Se-free fungal pellets (56.2 ± 2.8 %) at pH 4.5 and an initial Zn concentration of 10 mg L. The enhanced sorption capacity of nSe-pellets was attributed to a higher concentration of sorption sites resulting in a more negative surface charge density, as determined by analysis of the potentiometric titration data. Fourier transform infrared spectroscopy (FT-IR) analysis of fungal pellets prior to and after being loaded with Zn showed the functional groups, including hydroxyl and carboxyl groups, involved in the sorption process. The experimental data indicated that the sorption rate of the nSe-pellets fitted well to the pseudo-second order kinetic model (R = 0.99), and the sorption isotherm was best represented by the Sips model (Langmuir-Freundlich) with heterogeneous factor n = 1 (R = 0.99), which is equivalent to the Langmuir model. Operational advantages of fungal pelleted reactors and the Zn removal efficiencies achieved by nSe-pellets under mild acidic conditions make nSe-pellet based bioreactors an efficient biosorption process.
研究了一种新型混合生物吸附剂——固定在黄孢原毛平革菌颗粒中的元素硒纳米颗粒（nSe）从水溶液中去除锌的性能。含nSe的真菌颗粒（nSe颗粒）表现出更好的生物吸附性能，在pH值为4.5、初始锌浓度为10 mg/L时，与无硒真菌颗粒（56.2±2.8%）相比，它们去除的锌更多（88.1±5.3%）。通过电位滴定数据分析确定，nSe颗粒吸附能力的增强归因于吸附位点浓度较高，导致表面电荷密度更负。对负载锌前后的真菌颗粒进行傅里叶变换红外光谱（FT-IR）分析，显示了参与吸附过程的官能团，包括羟基和羧基。实验数据表明，nSe颗粒的吸附速率很好地符合准二级动力学模型（R = 0.99），吸附等温线最好用具有异质因子n = 1的Sips模型（Langmuir-Freundlich）表示（R = 0.99），这等同于Langmuir模型。真菌颗粒反应器的操作优势以及nSe颗粒在温和酸性条件下实现的锌去除效率，使基于nSe颗粒的生物反应器成为一种高效的生物吸附工艺。
