Layered silicate RUB-15 for efficient removal of UO22+ and heavy metal ions by ion-exchange,Environmental Science: Nano

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Layered silicate RUB-15 for efficient removal of UO22+ and heavy metal ions by ion-exchange
Environmental Science: Nano ( IF 5.8 ) Pub Date : 2017-07-19 00:00:00 , DOI: 10.1039/c7en00366h
Zhe Chen _{1,

2,

3,

4} , Yu Liang _{1,

2,

3,

4,

5} , Dashuang Jia _{1,

2,

3,

4} , Wanying Chen _{1,

2,

3,

4} , Zhimin Cui _{4,

6,

7,

8} , Xiangke Wang _{1,

2,

3,

4}

Affiliation

Remediation of water systems containing radionuclides and heavy metals is important to human health. In this work, two-dimensional layered silicate RUB-15 was fabricated by a straightforward and scalable hydrothermal method and then applied in water remediation for the first time. The layered silicate RUB-15 exhibited high adsorption abilities and efficient adsorption rates for not only UO₂²⁺ but also heavy metal ions (Pb²⁺ and Cd²⁺). The maximum adsorption capacities for UO₂²⁺, Pb²⁺ and Cd²⁺ of RUB-15 were 152, 338 and 190 mg g⁻¹, respectively. A pseudo-second-order reaction is observed on RUB-15 and the highest distribution coefficient K_d value reached was 1.42 × 10⁴ mL g⁻¹. XRD, EDX and XPS analyses proved that the ion-exchange between UO₂²⁺ (or Pb²⁺ and Cd²⁺) and tetramethylammonium (TMA) cations inside the interlayer space of RUB-15 was the key adsorption mechanism. The abundant TMA cations inside RUB-15 supplied sufficient ion-exchange sites for the contaminant, and the large interlayer spacing of RUB-15 (1.4 nm) assured efficient ion diffusion rates. The multiple advantages of RUB-15, such as good dispersion in water, low cost, high adsorption capacities for heavy metal ions and UO₂²⁺ ions and efficient regeneration made the layered silicate RUB-15 a promising adsorbent in water treatment applications.

中文翻译：

层状硅酸盐RUB-15，用于通过离子交换有效去除UO ₂²⁺和重金属离子

含有放射性核素和重金属的水系统的修复对人体健康很重要。在这项工作中，二维的层状硅酸盐RUB-15是通过简单且可扩展的水热方法制造的，然后首次应用于水修复中。层状硅酸盐RUB-15不仅对UO ₂²⁺而且对重金属离子（Pb ²⁺和Cd ²⁺）都表现出高吸附能力和有效吸附率。RUB-15对UO _{2 2}⁺，Pb ²⁺和Cd ²⁺的最大吸附容量为152、338和190 mg g ^-1，分别。在RUB-15上观察到伪二级反应，达到的最高分配系数K _d值为1.42×10 ⁴ mL g ^-1。XRD，EDX和XPS分析证明UO ₂²⁺（或Pb ²⁺和Cd ²⁺）和RUB-15层间空间内的四甲基铵（TMA）阳离子是关键的吸附机理。RUB-15内大量的TMA阳离子为污染物提供了足够的离子交换位，而RUB-15的较大的层间距（1.4 nm）确保了有效的离子扩散速率。RUB-15的多重优势，例如在水中的良好分散性，低成本，对重金属离子和UO ₂²⁺离子的高吸附能力以及高效再生，使得层状硅酸盐RUB-15成为水处理应用中有希望的吸附剂。

更新日期：2017-09-14

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