Instituto de Biotecnología Ambiental y Salud (INBIAS), Facultad de Ciencias Exactas, Físico-Químicas y Naturales (CONICET - Universidad Nacional de Río Cuarto), CPX5804BYA Río Cuarto, Córdoba, Argentina.
Instituto de Biotecnología Ambiental y Salud (INBIAS), Facultad de Ciencias Exactas, Físico-Químicas y Naturales (CONICET - Universidad Nacional de Río Cuarto), CPX5804BYA Río Cuarto, Córdoba, Argentina.
J Biotechnol. 2021 Feb 20;328:87-94. doi: 10.1016/j.jbiotec.2021.01.011. Epub 2021 Jan 19.
A biosorbent composed of non-viable Pseudomonas putida trapped in agar beads was able to remove Cu and Zn from solutions containing one or both metals. The process in batch followed pseudo second-order kinetics, with adsorption capacities of 0.255 mg Cu/g and 0.170 mg Zn/g according to the Langmuir isotherm. These values were up to ten times lower for beads without biomass. The metals became bound to OH, CH, CO, COC and COP groups, with the last three being provided by the biomass, which highlights its importance. Adsorption values for single-metal solutions filtered in a fixed-bed column were 0.152 mg Cu/g and 0.117 mg Zn/g, but decreased to 0.075 and 0.058, respectively, with mixed-metal solutions (1:1 ratio). In 10:1-ratio solutions, the metal in greater proportion was better adsorbed. Under all conditions, removal percentage was ∼60 %. The column could be reused throughout ten absorption/desorption cycles without significant alterations in adsorption capacity.
一种由琼脂珠内固定的非存活假单胞菌组成的生物吸附剂能够从含有一种或两种金属的溶液中去除 Cu 和 Zn。在间歇式过程中，根据 Langmuir 等温线，吸附容量分别为 0.255 mg Cu/g 和 0.170 mg Zn/g，遵循拟二级动力学。对于没有生物质的珠状颗粒，这些值低了十倍。金属与 OH、CH、CO、COC 和 COP 基团结合，后三个基团由生物质提供，这凸显了其重要性。在固定床柱中过滤的单金属溶液的吸附值分别为 0.152 mg Cu/g 和 0.117 mg Zn/g，但在混合金属溶液（1:1 比例）中分别降至 0.075 和 0.058。在 10:1 比例的溶液中，比例较大的金属吸附效果更好。在所有条件下，去除率约为 60%。该柱在十个吸收/解吸循环中可重复使用，而吸附容量没有明显变化。
