期刊
ENVIRONMENTAL SCIENCE-NANO
卷 4, 期 9, 页码 1851-1858出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c7en00366h
关键词
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资金
- National Natural Science Foundation of China [NSFC 51502089]
- National Key Research and Development Program of China [2017YFA0207000]
- Fundamental Research Funds for the Central Universities [2016MS03]
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 Kd value reached was 1.42 x 10(4) 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.
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