利用微藻基材料去除水中六价铬：吸附、解吸和回收研究。
Hexavalent chromium removal from water by microalgal-based materials: Adsorption, desorption and recovery studies.
机构信息
Department of Environmental and Biological Sciences, University of Eastern Finland, P.O. Box 1627, FI-70211 Kuopio, Finland.
Department of Environmental and Biological Sciences, University of Eastern Finland, P.O. Box 1627, FI-70211 Kuopio, Finland; Department of Natural Resources, Isfahan University of Technology, Isfahan 8415683111, Iran.
出版信息
Bioresour Technol. 2019 Dec;293:122064. doi: 10.1016/j.biortech.2019.122064. Epub 2019 Aug 26.
The current study presents a comprehensive comparison towards the potential of different microalgal-based materials for the removal of hexavalent chromium (Cr(VI)) from water. Among the tested materials, microalgal biochar showed the highest removal efficiency (100%) of Cr(VI). The highest monolayer estimated adsorption capacities were 23.98, 25.19 and 24.27 mg/g at 5, 22 and 35 °C, respectively. Experimental data showed good compliance with pseudo-second-order kinetic model. The results of continuous column studies showed that the column removal efficiency increased from 52.33 to 57.58% by increasing the adsorbent dose from 0.125 to 0.200 g. Desorption efficiency of Cr(VI) by 0.1 M NaOH was increased from 51.16 to 59.41% by sonication bath as compared to roller shaker. More than 97% of desorbed Cr(VI) was recovered in less than 10 min by BaCl. This study shows that non-living microalga materials are more effective than living cells in the removal and recovery of Cr(VI) from water.
本研究全面比较了不同微藻基材料去除水中六价铬（Cr(VI)）的潜力。在测试的材料中，微藻生物炭表现出最高的 Cr(VI)去除效率（100%）。在 5、22 和 35°C 下，最大单层估计吸附容量分别为 23.98、25.19 和 24.27 mg/g。实验数据表明，其符合准二级动力学模型。连续柱研究的结果表明，通过将吸附剂剂量从 0.125 增加到 0.200 g，柱去除效率从 52.33%增加到 57.58%。与滚轴式摇床相比，超声浴使 0.1 M NaOH 的 Cr(VI)解吸效率从 51.16%提高到 59.41%。不到 10 分钟，BaCl 就回收了超过 97%的解吸 Cr(VI)。本研究表明，在去除和回收水中的 Cr(VI)方面，非活体微藻材料比活细胞更有效。
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