Encapsulation of a powdery spinel-type Li+ ion sieve derived from biogenic manganese oxide in alginate beads
Encapsulation of a powdery spinel-type Li+ ion sieve derived from biogenic manganese oxide in alginate beads
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DOI：
10.1016/j.powtec.2016.08.009
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发表时间：
2016-11
影响因子：
5.2
通讯作者：
Paulmanickam Koilraj;S. M. Smith;Qianqian Yu;Sarah Ulrich;K. Sasaki
中科院分区：
文献类型：
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作者：
Paulmanickam Koilraj;S. M. Smith;Qianqian Yu;Sarah Ulrich;K. Sasaki
从生物水钠石中提取的粉状锂离子筛(HMO)被均匀地集成在海藻酸钠(AL)小球中。然后对复合微珠进行了表征，并研究了它们对Li+的吸附性能。扫描电子显微镜-能谱分析表明，即使在干燥后，HMO颗粒仍均匀分散在铝珠中。铝包埋HMO(HMO-AL)对Li+的吸附等温线符合线性Langmuir模型，其最大吸附容量为3.61 mm ol/g，与原粉末状HMO相当。动力学研究表明，在初始Li+浓度范围为2.56~4.23m m时，Li+的吸附遵循准二级模型，吸附速率常数k2=22.8-11.9M×10mmol.3g/(−·min)。Li+从水溶液中通过Ca-Al网络扩散到HMO颗粒是Li+在HMO-Al小球上吸附的限速步骤。HMO-AL小球提高了对Li+吸附的处理效率，并在不明显降低Li+吸附效果的情况下重复使用。
A powdery lithium ion sieve (HMO) derived from biogenic birnessite was homogeneously integrated in sodium alginate (AL) beads. The composite beads were then characterized and their Li+adsorption properties were investigated. Scanning electron microscopy–energy dispersive spectroscopy analysis showed that the HMO particles were homogeneously dispersed in the AL beads even after drying. The adsorption isotherm of Li+adsorption to HMO encapsulated in AL beads (HMO–AL) was well fitted by the linear Langmuir model, and the beads showed a maximum adsorption capacity of 3.61 mmol/g based on HMO, which is comparable with the value of the original powdery HMO. Kinetic studies revealed that adsorption of Li+follows a pseudo-second-order model with rate constantk2= 2.8–11.9 × 10− 3g/(mmol min) for the initial Li+concentration range 2.56–4.23 mM. Diffusion of Li+from aqueous solution to the HMO particle through the Ca–AL network is the rate-limiting step for Li+adsorption to HMO–AL beads. The HMO-AL beads enhanced the handling efficiency for Li+adsorption and reused without significant reduction of Li+adsorption efficacy.