Superadsorbents for Strontium and Cesium Removal Enriched in Amidoxime by Homo-IPN Strategy Connected with Porous Silica Texture.,ACS Applied Materials & Interfaces

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Superadsorbents for Strontium and Cesium Removal Enriched in Amidoxime by Homo-IPN Strategy Connected with Porous Silica Texture.
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2020-09-16 , DOI: 10.1021/acsami.0c10983
Ecaterina Stela Dragan ₁ , Doina Humelnicu ₂ , Maria Ignat ₂ , Cristian Dragos Varganici ₁

Affiliation

In light of the fact that two with good compatibility are better than one, the homo-interpenetrating polymer network (IPN) strategy was used in this work to design novel amidoxime (AOX)-interpenetrating networks into porous silica (PSi) with the final aim to enhance the sorption performances of composite sorbents toward Cs⁺ and Sr²⁺. To achieve this goal, first, a homo-IPN of poly(acrylonitrile) (PAN) was constructed inside the channels of two kinds of porous silica, one mesoporous (PSi1) and one macroporous (PSi2), the textural properties of silica being exploited in controlling the sorption performances of the composites. The novel composites were fully characterized by thermogravimetric analysis (TGA), Fourier transform infrared (FTIR) spectroscopy, scanning electron microscopy (SEM), and the nitrogen sorption/desorption isotherms (Brunauer–Emmett–Teller (BET) analysis). The sorption properties of the PSi1/AOX and PSi2/AOX composite sorbents for Sr²⁺ and Cs⁺ were investigated in the batch mode to determine the effect of solution pH, contact time, initial metal ion concentration, temperature, and the presence of competitive ions on the adsorption performances. The fast kinetics of sorption was supported by the fact that ∼80% of Sr²⁺ and ∼65% of Cs⁺ were adsorbed in the first 30 min, the kinetic data being better described by the pseudo-second-order kinetic model. The experimental isotherms were well fitted by the Langmuir and Sips isotherm models. The superadsorption of Sr²⁺ and Cs⁺ is demonstrated by the values of the maximum sorption capacity of the best sorbent constructed with mesoporous silica (PSi1/IPN-AOX), which were 344.23 mg Cs⁺/g and 360.23 mg Sr²⁺/g. The sorption process was spontaneous and endothermic for both metal ions. The presence of interfering cations (Na⁺, K⁺, Ca²⁺, and Mg²⁺), at a concentration of 10^–2 M, only slightly influenced the sorption capacity for the main cation. The composite sorbents were still highly efficient after five sorption/desorption cycles.

中文翻译：

Homo-IPN策略结合多孔二氧化硅质地富集A胺肟中锶和铯的超强吸附剂。

鉴于具有良好相容性的两种优于一种相容性这一事实，本研究采用均相互穿聚合物网络（IPN）策略将新型novel胺肟（AOX）互穿网络设计为多孔二氧化硅（PSi），最终目的是增强复合吸附剂对Cs ⁺和Sr ²⁺的吸附性能。为了实现这一目标，首先，在两种多孔二氧化硅的通道（一种为中孔（PSi1）和一种为大孔（PSi2））的通道内构建了聚丙烯腈（PAN）的均质IPN，并利用了二氧化硅的结构特性在控制复合材料的吸附性能方面。新型复合材料通过热重分析（TGA），傅立叶变换红外（FTIR）光谱，扫描电子显微镜（SEM）和氮吸附/解吸等温线（Brunauer-Emmett-Teller（BET）分析）进行了全面表征。PSi1 / AOX和PSi2 / AOX复合吸附剂对Sr ²⁺和Cs ⁺的吸附性能以分批方式对溶液进行了研究，以确定溶液的pH值，接触时间，初始金属离子浓度，温度以及竞争性离子的存在对吸附性能的影响。在最初的30分钟内，约80％的Sr ²⁺和约65％的Cs ⁺被吸附，这支持了快速的吸附动力学，动力学数据可以用伪二级动力学模型更好地描述。Langmuir和Sips等温线模型很好地拟合了实验等温线。Sr ²⁺和Cs ⁺的超强吸附由中孔二氧化硅（PSi1 / IPN-AOX）构造的最佳吸附剂的最大吸附容量值证实，分别为344.23 mg Cs ⁺ / g和360.23 mg Sr^{2 +} /克。两种金属离子的吸附过程都是自发的并且是吸热的。浓度为10 ^–2 M的干扰阳离子（Na ⁺，K ⁺，Ca ²⁺和Mg ²⁺）的存在仅对主要阳离子的吸附能力产生了轻微影响。经过五个吸附/解吸循环后，复合吸附剂仍然非常高效。

更新日期：2020-10-07

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