School of Ocean, Yantai University, Yantai, China.
School of Chemistry and Materials Science, Ludong University, Yantai, Shandong, China.
J Appl Microbiol. 2021 Nov;131(5):2270-2279. doi: 10.1111/jam.15100. Epub 2021 Apr 21.
The adsorption behaviour and mechanisms of the surface modified activated carbon with bacteria was evaluated.
16S rRNA was employed to identify the hydrocarbon-degrading bacteria. The bacteria was characterized by TEM and electron microscope. The surface modified activated carbon with bacteria was characterized by SEM. The adsorption behaviour was tested by static adsorption and dynamic adsorption.
The adsorption efficiency of the modified activated carbon was high when pH was weak acidic, and the adsorption capacity increased with the increase of temperature ranging from 20 to 35°C. The adsorption capacity peaked at 234·6 mg g at 25°C, which was sixfold higher than that of activated carbon. The pseudo-first-order kinetic can more accurately assess Congo red adsorption on the two adsorbents. The adsorption of Congo red by bacteria surface modified activated carbon fitted well with the Langmuir's model. The adsorption process was endothermic, and the biological floccules were formed during the adsorption. The physical adsorption is the main driving force.
The results indicate that the bacteria surface-modified activated carbon can be used effectively as an adsorbent to eliminate Congo red from aqueous solutions.
评估细菌表面改性活性炭的吸附行为和机制。
采用 16S rRNA 鉴定烃类降解细菌。通过 TEM 和电子显微镜对细菌进行了表征。采用 SEM 对细菌表面改性活性炭进行了表征。通过静态吸附和动态吸附测试了吸附行为。
当 pH 值为弱酸性时，改性活性炭的吸附效率较高，吸附容量随温度从 20°C 增加到 35°C 而增加。在 25°C 时，吸附容量达到 234.6mg/g，是活性炭的六倍。伪一级动力学可以更准确地评估刚果红在两种吸附剂上的吸附。细菌表面改性活性炭对刚果红的吸附符合朗缪尔模型。吸附过程是吸热的，在吸附过程中形成生物絮体。物理吸附是主要驱动力。
结果表明，细菌表面改性活性炭可有效用作吸附剂，从水溶液中去除刚果红。
