College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China; Key Laboratory of Environmental Biology and Pollution Control, Hunan University, Ministry of Education, Changsha 410082, PR China.
Bioresour Technol. 2013 Nov;148:414-21. doi: 10.1016/j.biortech.2013.09.011. Epub 2013 Sep 11.
In this work, microbial flocculant GA1 (MBFGA1) was used to remove Pb(II) ions from aqueous solution. A series of experimental parameters including initial pH, MBFGA1 dose, temperature and initial calcium ions concentration on Pb(II) uptake was evaluated. Meanwhile, the flocculation mechanism of MBFGA1 was investigated. The removal efficiency of Pb(II) reached up to 99.85% when MBFGA1 was added in two stages, separately. The results indicated that Pb(II) adsorption could be described by the Langmuir adsorption model, and being the monolayer capacity negatively affected with an increase in temperature. The adsorption process could be described by pseudo-second-order kinetic model. Fourier transform-infrared spectra and environmental scanning electron microscope analysis indicated that MBFGA1 had a large number of functional groups, which had strong capacity for removing Pb(II). The main mechanisms of Pb(II) removal by MBFGA1 could be charge neutralization and adsorption bridging.
在这项工作中，微生物絮凝剂 GA1（MBFGA1）被用于从水溶液中去除 Pb(II)离子。评估了一系列实验参数，包括初始 pH 值、MBFGA1 剂量、温度和初始钙离子浓度对 Pb(II)摄取的影响。同时，研究了 MBFGA1 的絮凝机理。当分两步添加 MBFGA1 时，Pb(II)的去除效率高达 99.85%。结果表明，Pb(II)吸附可以用 Langmuir 吸附模型来描述，并且随着温度的升高，单层容量呈负相关。吸附过程可以用拟二级动力学模型来描述。傅里叶变换-红外光谱和环境扫描电子显微镜分析表明，MBFGA1 具有大量的功能基团，对去除 Pb(II)具有很强的能力。MBFGA1 去除 Pb(II)的主要机制可能是电荷中和和吸附桥接。
