Synthesis of layered titanate nanowires at low temperature and their application in efficient removal of U(VI)
Synthesis of layered titanate nanowires at low temperature and their application in efficient removal of U(VI)
复制标题
层状钛酸盐纳米线的低温合成及其在高效去除U(VI)中的应用
DOI：
10.1016/j.envpol.2017.03.078
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发表时间：
2017
影响因子：
8.9
通讯作者：
Wang Xiangke
中科院分区：
文献类型：
--
作者：
Yin Ling;Wang Pengyi;Wen Tao;Yu Shujun;Wang Xiangxue;Hayat Tasawar;Alsaedi Ahmed;Wang Xiangke
铀（VI）对周围环境具有生产性和不可逆转的影响，已成为最具潜在污染力的污染物之一。钛纳米线因其高的离子交换能力和易于合成而受到人们的广泛关注。采用傅立叶变换红外光谱、扫描电子显微镜、透射电子显微镜、X射线衍射和X射线光电子能谱等手段对TNW的形貌和结构进行了研究。采用间歇法研究了不同环境条件下TNW对U（VI）的吸附，结果表明，TNW对U（VI）的吸附受pH的影响较大，受离子强度的影响较小。PO 43-和CO 32-的存在显著影响了U（VI）与TNW的相互作用，主要是通过形成阴离子和电中性的配合物。根据Langmuir模型模拟，在298 K、313 K和328 K温度下，最大吸附容量分别为358、384和410 mg g− 1。热力学计算结果表明，该相互作用过程是自发的吸热过程。TNW具有优异的离子交换性能和合成条件温和等优点，在环境放射性污染的治理中，可有效去除水溶液中的U（VI）等镧系元素和锕系元素。
Uranium(VI) has become one of the most potential contaminants due to its productive and irreversibility impact on the surrounding environment. Titanate nanowires (TNWs) have attracted significant attention because of its high ion exchange ability and facile synthesis. Herein the TNWs were synthesized, and the morphology and structure of TNWs were investigated by Fourier transformed infrared spectroscopy, scanning electron microscope, transmission electron microscope, X-ray diffraction and X-ray photoelectron spectroscopy in detail. The application of TNWs in U(VI) removal was studied under various environmental conditions using batch technique, and the results indicated that the sorption of U(VI) on TNWs was strongly affected by pH and weakly affected by ionic strength. The presence of PO43-and CO32-could overwhelmingly influence U(VI) interaction with TNWs, which was mainly attributed to the formation of anionic and electro-neutral complexes. From the Langmuir model simulation, the maximum sorption capacities were calculated to be 358, 384, and 410 mg g−1at the temperatures of 298 K, 313 K and 328 K, respectively. The thermodynamic results revealed that the interaction process was spontaneous and endothermic. The extraordinary ion exchange capacity and facile synthesis under mild conditions made TNWs promising materials for the potential application in the efficient elimination of U(VI) or other lanthanides and actinides from aqueous solutions in the environmental radioactive pollution cleanup.