Microbial Ecology Department, Institute of Microbiology, Bulgarian Academy of Sciences, Acad G Bonchev Str, bl 26, 1113 Sofia, Bulgaria.
Bioresour Technol. 2010 Mar;101(6):1727-31. doi: 10.1016/j.biortech.2009.10.012. Epub 2009 Nov 10.
This study investigates the ability of Aspergillus niger resting cells entrapped into poly(vinyl alcohol) (PVA) network to remove Cu(II) and Cd(II) from single ions solutions. The performance of free and immobilized biosorbent was evaluated by equilibrium and kinetic studies. The PVA-immobilized fungal biosorbent removed Cu(II) and Cd(II) rapidly and efficiently with maximum metal removal capacities of 34.13 mg/g and 60.24 mg/g, respectively. These values of heavy metal uptake at equilibrium were higher than the amount of Cu(II) and Cd(II) removal by free biomass (17.60 mg/g and 69.44 mg/g, respectively). Biosorption equilibrium data were best described by Langmuir isotherm model. The biosorption kinetics followed the pseudo-second order model and intraparticle diffusion equation. The results obtained suggest that the immobilized biosorbent holds great potential for wastewater treatment applications.
本研究考察了黑曲霉静息细胞包埋在聚乙烯醇（PVA）网络中去除单一离子溶液中 Cu(II) 和 Cd(II) 的能力。通过平衡和动力学研究评估了游离和固定化生物吸附剂的性能。PVA 固定化真菌生物吸附剂能够快速高效地去除 Cu(II) 和 Cd(II)，最大金属去除容量分别为 34.13mg/g 和 60.24mg/g。这些平衡时重金属摄取量的值高于游离生物质去除的 Cu(II) 和 Cd(II)量（分别为 17.60mg/g 和 69.44mg/g）。吸附平衡数据最好用 Langmuir 等温模型描述。吸附动力学遵循拟二级模型和内扩散方程。研究结果表明，固定化生物吸附剂在废水处理应用中具有巨大的潜力。
