肺炎克雷伯菌J1分泌的胞外聚合物对四环素的吸附行为
Adsorption behavior of tetracycline by extracellular polymeric substrates extracted from Klebsiella sp. J1.
作者信息
Li Ang, Pi Shanshan, Wei Wei, Chen Ting, Yang Jixian, Ma Fang
机构信息
State Key Laboratory of Urban Water Resource and Environment, School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin, 150090, People's Republic of China.
出版信息
Environ Sci Pollut Res Int. 2016 Dec;23(24):25084-25092. doi: 10.1007/s11356-016-7726-6. Epub 2016 Sep 27.
The extracellular polymeric substrate (EPS) extracted from Klebsiella sp. J1 was used to adsorb low concentrations of tetracycline, and the efficiency and mechanism of tetracycline adsorption by EPS from strain J1 were studied. Adsorption efficiency was evaluated at different conditions. Results showed that optimal adsorption efficiency was 71.68 % with 60 mg L of EPS from strain J1 and 90 μL of 10 % (w/v) CaCl in 100 mL of tetracycline solution (80 μg L) with pH of 8.0. Experimental data was fitted well with Langmuir, Freundlich isotherm, and pseudo-second-order models. Analyses of E value, Ea value, thermodynamics, zeta potential variation, and Fourier transform infrared spectroscopy (FTIR) spectra proved that chemisorption was the main adsorption type and bridging was the main adsorption mechanism. Thermodynamic analysis indicated that adsorptive reaction was exothermic from 20 to 40 °C. In addition, humic acid (HA) showed little effect on the tetracycline adsorption by MFX.
从肺炎克雷伯菌J1菌株中提取的胞外聚合物基质（EPS）用于吸附低浓度的四环素，并研究了J1菌株EPS对四环素的吸附效率和机制。在不同条件下评估吸附效率。结果表明，在100 mL四环素溶液（80 μg/L）、pH值为8.0的条件下，使用60 mg/L的J1菌株EPS和90 μL 10%（w/v）的CaCl₂时，最佳吸附效率为71.68%。实验数据与朗缪尔等温线、弗伦德利希等温线和准二级模型拟合良好。对E值、Ea值、热力学、ζ电位变化和傅里叶变换红外光谱（FTIR）光谱的分析证明，化学吸附是主要的吸附类型，桥连是主要的吸附机制。热力学分析表明，在20至40°C范围内吸附反应是放热的。此外，腐殖酸（HA）对MFX吸附四环素的影响很小。
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