Synthesis of functionalized porous montmorillonite via solid-state NaOH treatment for efficient removal of cesium and strontium ions
Synthesis of functionalized porous montmorillonite via solid-state NaOH treatment for efficient removal of cesium and strontium ions
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DOI：
10.1016/j.apsusc.2018.04.181
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发表时间：
2018-08-30
影响因子：
6.7
通讯作者：
Lee, Jae W.
中科院分区：
文献类型：
--
作者：
Kim, Yonghwan;Kim, Yun Kon;Lee, Jae W.
采用固态氢氧化钠处理蒙脱石粘土，以提高Cs+和Sr 2+的去除率。通过这种简单、低成本的改性，（117.1 m（2）g（-1））和许多表面官能团（SiAOANa），表现出增强的吸附动力学（40 mg L-1Cs+和23 mg L-1 Sr 2+在1 h内去除89%），对Cs+的吸附容量为290.7 mg g（-1），对Sr 2+的吸附容量为184.8 mg g（-1），大大超过了原始蒙脱石的低吸附容量（Cs+为137.0 mg g（-1），Sr 2+为15.6 mg g（-1））。SEM-EDS和XPS分析表明，Cs+和Sr 2+与Na+在NaOH处理后形成的表面官能团上进行了离子交换。经NaOH处理后的蒙脱土经γ射线辐照后性能稳定（在6戈伊h（-1）下30 min）和在宽范围的pH（3至11）下，对Cs+表现出1.5 x 10（3）mL g（-1）的高分配系数（Kd）（1.58 mg L-1）和3.7 × 10（3）mL g（-1）的Sr 2+（1.64 mg L-1）在地下水条件下，其中各种阳离子包括Na+，K+，和Ca 2+（V/m = 1 L/g）存在。所提出的方法证明了一个丰富的和廉价的蒙脱石的吸附能力的显着改善。(C)2018 Elsevier B. V.版权所有。
Solid-state NaOH treatment of montmorillonite clay was used to enhance the removal of Cs+ and Sr2+. Through this facile and low-cost modification, montmorillonite with a large BET surface area (117.1 m(2) g(-1)) and many surface functional groups (SiAOANa), demonstrated enhanced sorption kinetics (89% removal for 40 mg L-1 Cs+ and 23 mg L-1 Sr2+ in 1 h) with a sorption capacity of 290.7 mg g(-1) for Cs+ and 184.8 mg g(-1) for Sr2+, greatly exceeding the low sorption capacity (137.0 mg g(-1) for Cs+ and 15.6 mg g(-1) for Sr2+) of pristine montmorillonite. SEM-EDS and XPS analyses revealed that Cs+ and Sr2+ were ion-exchanged with Na+ on the surface functional groups formed following NaOH treatment. The performance of NaOH-treated montmorillonite was stable following gamma-ray irradiation (at 6 Gy h(-1) for 30 min) and across a broad range of pHs (3 to 11), exhibiting a high distribution coefficient (Kd) of 1.5 x 10(3) mL g(-1) for Cs+ (1.58 mg L-1) and 3.7 x 10(3) mL g(-1) for Sr2+ (1.64 mg L-1) under groundwater conditions where various cations including Na+, K+, and Ca2+ (V/m = 1 L/g) were present. The proposed method demonstrated great improvement of the sorption capacity of an abundant and inexpensive montmorillonite. (C) 2018 Elsevier B.V. All rights reserved.