Solisio Carlo, Al Arni Saleh, Converti Attilio
a Department of Civil, Chemical and Environmental Engineering , Genoa University , Genoa , Italy.
b Chemical Engineering Department , University of Hai'l , Hai'l , Kingdom of Saudi Arabia.
Environ Technol. 2019 Feb;40(5):664-672. doi: 10.1080/09593330.2017.1400114. Epub 2017 Nov 11.
This study focused on kinetics and equilibrium isotherms of mercury biosorption from water using dry biomass of Chlorella vulgaris as biosorbent at pH 5.0. Biosorption tests were performed at 2.0 g/L biomass dosage varying initial Hg concentration from 11.0 to 90.6 mg/L. The Lagergren equation was found to best describe the process, with R of 0.984 and specific rate constant of 0.029 ± 0.004 min. Although equilibrium data were well fitted by the Dubinin and Radushkevich isotherm (R = 0.870; q = 16.6 mg/g), important insights on phenomenological events occurring at equilibrium were concurrently provided by the Lamgmuir one (R = 0.826; q = 32.6 mg/g; K = 0.059 L/mg). FT-IR analysis confirmed that Hg biosorption took place via physisorption. Since C. vulgaris is a fresh-water microalga that can be easily cultivated anywhere, these promising results suggest its possible use as an effective, low-cost biosorbent to treat industrial effluents contaminated by this metal.
本研究聚焦于在pH值为5.0的条件下，以普通小球藻的干燥生物质作为生物吸附剂，从水中生物吸附汞的动力学和平衡等温线。生物吸附试验在生物质剂量为2.0 g/L的条件下进行，初始汞浓度在11.0至90.6 mg/L之间变化。发现Lagergren方程最能描述该过程，相关系数R为0.984，比速率常数为0.029±0.004 min⁻¹。尽管平衡数据与Dubinin和Radushkevich等温线拟合良好（R = 0.870；q = 16.6 mg/g），但Langmuir等温线同时提供了关于平衡时发生的现象学事件的重要见解（R = 0.826；q = 32.6 mg/g；K = 0.059 L/mg）。傅里叶变换红外光谱（FT-IR）分析证实汞的生物吸附是通过物理吸附发生的。由于普通小球藻是一种淡水微藻，易于在任何地方培养，这些有前景的结果表明它有可能作为一种有效、低成本的生物吸附剂用于处理受该金属污染的工业废水。
