Synthesis of Iron-Doped Manganese Oxides with an Ion-Sieve Property: Lithium Adsorption from Bolivian Brine
Synthesis of Iron-Doped Manganese Oxides with an Ion-Sieve Property: Lithium Adsorption from Bolivian Brine
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DOI：
10.1021/ie4043642
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发表时间：
2014-03-05
影响因子：
4.2
通讯作者：
Sonoda, Akinari
中科院分区：
文献类型：
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作者：
Chitrakar, Ramesh;Makita, Yoji;Sonoda, Akinari
通过在空气中在 350、400、450、550 和 650 摄氏度下煅烧 Li、Mn 和 Fe 的硝酸盐制备铁掺杂的锂锰氧化物 Li1.33FexMn1.67-xO4（x = 0.15、0.30 和 0.40）。通过 X 射线衍射 (XRD) 和化学分析对煅烧后的样品进行了表征。分析，均为尖晶石。用HCl溶液处理后的质子化样品作为吸附剂对从玻利维亚乌尤尼盐湖收集的盐湖卤水中的锂吸附进行了测试。在450℃下煅烧得到的Fe/Mn比为0.1的酸处理后，前驱体的Mn提取率为3.7%。在HCl溶液中提取的Mn量随着Fe/Mn比的增加而减少，当Fe/Mn=0.1、Fe/Mn=0.2和Fe/Mn=0.3时，锂提取量分别为90%、96%和91%，而Fe/Mn=0.3时，锂提取量分别为90%、96%和91%。 溶解铁则呈现相反的趋势。通过间歇法研究原盐水和添加 NaOH 的盐水中的锂吸附情况，发现前驱体在 450 ℃ 下煅烧获得的 Fe/Mn 比为 0.1 的吸附剂是高效的锂吸附剂，在最终 pH 2.0 时，原盐水（初始 pH 6.7）的锂吸收量为 18 mg/g，最终 pH 7.2 时的锂吸收量为 28 mg/g。 来自添加 NaOH 的盐水（初始 pH 8.2）。将前体在450℃下煅烧得到的Fe/Mn比为0.1的吸附剂进行4次循环吸附/解吸实验评价。溶液中锰的提取量（%）随着循环次数的增加而减少，第一个循环为1.1%，第四个循环为0.70%。
Iron-doped lithium manganese oxides Li1.33FexMn1.67-xO4 (x = 0.15, 0.30, and 0.40) were prepared by calcination of carbonates of Li, Mn, and nitrate of Fe in air at 350, 400, 450, 550, and 650 degrees C. The calcined samples, characterized by X-ray diffraction (XRD) and chemical analysis, were spinels. The protonated samples after treatment with HCl solution were tested as adsorbents for lithium adsorption from the salt lake brine collected from the Salar de Uyuni, Bolivia. The precursor showed 3.7% Mn extraction upon acid treatment with Fe/Mn ratio of 0.1 obtained from calcination at 450 degrees C. The amount of Mn extracted in HCl solution decreased with increasing of Fe/Mn ratio, and the amounts of lithium extraction were 90%, 96%, and 91% for Fe/Mn = 0.1, Fe/Mn = 0.2, and Fe/Mn = 0.3, respectively, while the amounts of dissolved iron showed the opposite trend. By studying the lithium adsorption in the raw brine and NaOH-added brine by a batch method, the adsorbent with Fe/Mn ratio of 0.1 obtained from calcination of the precursor at 450 degrees C was found to be efficient lithium adsorbent with lithium uptake of 18 mg/g at final pH 2.0 from the raw brine (initial pH 6.7) and 28 mg/g at final pH 7.2 from the NaOH-added brine (initial pH 8.2). The adsorbent with Fe/Mn ratio of 0.1 obtained from calcination of the precursor at 450 degrees C was evaluated for a 4 cycle adsorption/desorption experiment. The amount of manganese extracted (%) in the solution decreased with cycle numbers, 1.1% in the first cycle and 0.70% in the fourth cycle.