Facile one-pot synthesis of dual-cation incorporated titanosilicate and its deposition to membrane surfaces for simultaneous removal of Cs+ and Sr2+
Facile one-pot synthesis of dual-cation incorporated titanosilicate and its deposition to membrane surfaces for simultaneous removal of Cs+ and Sr2+
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DOI：
10.1016/j.apsusc.2019.07.008
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发表时间：
2019-11-01
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, Yun Kon;Kim, Sungjun;Lee, Jae W.
从水环境中选择性去除Cs-137和Sr-90对于核废物的体积减小和最终安全储存至关重要。本文介绍了一种简单的一锅法水热合成双阳离子型钛硅酸盐（TiO_3，M_3HTi_4O_4（SiO_4）（3），M = Na ~+和K ~+）的方法，用于同时有效地去除Cs ~+和Sr ~（2+）。吸附动力学研究表明，在1 min内，对Cs+和Sr 2+的去除率分别达到98%和> 99%。此外，由于双阳离子的引入，该催化剂对Cs+和Sr 2+都具有上级选择性.在地下水中，Cs+（1 ppm，2.9 x 10（5）mL/g）和Sr 2+（1 ppm，1.0 x 10（5）mL/g）的分配系数（V/ m = 1000 mL/g时的K-d）都很高，即使在海水中，Cs+（1 ppm）的K-d值也高达4.9 x 10（4）mL/g。值得注意的是，石墨烯被合成为一种具有氧化石墨烯的膜，用于连续去除放射性核素，这对净化大量受污染的水非常有益。
Selective removal of Cs-137 and Sr-90 from aqueous environments is essential for the volume reduction and ultimate safe storage of nuclear waste. This study introduces a facile one-pot hydrothermal synthesis of Dual-cation form of TitanoSilicate (DTS, M3HTi4O4(SiO4)(3), M = Na+ and K+) for the effective and simultaneous removal of Cs+ and Sr2+. DTS showed enhanced adsorption capacities (469 mg/g for Cs+ and 179 mg/g for Sr2+) and the adsorption kinetics were extremely fast with around 98% and > 99% removal achieved within 1 min from a dilute Cs+ and Sr2+ solution, respectively. Moreover, DTS indicated the superior selectivity for both Cs+ and Sr2+ due to the dual-cation incorporation in the structure. In groundwater, the distribution coefficients (K-d at V/ m = 1000 mL/g) for DTS were high for both Cs+ (1 ppm, 2.9 x 10(5) mL/g) and Sr2+ (1 ppm, 1.0 x 10(5) mL/g), and even in seawater DTS maintained a Cs+ (1 ppm) K-d value as high as 4.9 x 10(4) mL/g. Remarkably, DTS is synthesized as a membrane with graphene oxide for continuous removal of the radionuclides, which is extremely beneficial to purifying a large volume of contaminated water.