School of Nuclear Science and Technology, University of South China, 28 Changsheng West Road, Hengyang, 421001, PR China.
School of Resources, Environment and Materials, Guangxi Key Laboratory of Processing for Non-ferrous Metallic and Featured Materials, Guangxi University, 100 Daxue Road, Nanning, 530004, PR China.
J Environ Manage. 2022 Oct 1;319:115718. doi: 10.1016/j.jenvman.2022.115718. Epub 2022 Jul 19.
Effective and efficient disposal of radioactive pollution has been crucial for responding to unexpected nuclear accidents and guaranteeing the sustainable development of nuclear energy. In this study, a kind of porous zirconium phosphate was synthesized with a sol-gel process followed by a post-synthesis modification to remove the radioactive Sr from wastewater. The prepared materials were characterized by different technologies including FT-IR, SEM-EDS, XRD and XPS, and then the adsorption performance was evaluated in batch and column modes. Experimental results suggested that the porous zirconium phosphate adsorbent was successfully prepared with Na dispersed in the channels for exchange. It inherited the excellent properties of zirconium dioxide aerogel and exhibited mesoporous structure and large specific surface area. Compared with traditional zirconium phosphate, the adsorption kinetics and the adsorption capacity were improved simultaneously. Especially, it showed excellent selectivity towards Sr among different cations, and even could remove the low-level Sr from natural seawater efficiently, which powerfully demonstrated that the prepared material could be applied in the treatment of practical wastewater. Spectra studies uncovered that the adsorption activities were dominated by the ion exchange mechanism between external Sr and interlaminar Na or H. In conclusion, this paper not only reports a novel synthesis strategy for the acquisition of porous zirconium phosphate, but also presents a promising adsorbent for the Sr removal.
有效和高效地处理放射性污染对于应对意外核事故和保障核能的可持续发展至关重要。在本研究中，采用溶胶-凝胶法合成了一种多孔磷酸锆，并通过后合成修饰去除废水中的放射性 Sr。通过傅里叶变换红外光谱（FT-IR）、扫描电子显微镜-能谱（SEM-EDS）、X 射线衍射（XRD）和 X 射线光电子能谱（XPS）等不同技术对所制备的材料进行了表征，然后在批式和柱式模式下评估了吸附性能。实验结果表明，成功制备了具有 Na 分散在通道中进行交换的多孔磷酸锆吸附剂。它继承了二氧化锆气凝胶的优良性能，表现出介孔结构和大的比表面积。与传统的磷酸锆相比，同时提高了吸附动力学和吸附容量。特别是，它对不同阳离子中的 Sr 表现出优异的选择性，甚至可以从天然海水中有效地去除低浓度的 Sr，这有力地证明了所制备的材料可以应用于实际废水的处理。光谱研究表明，吸附活性主要由外部 Sr 与层间 Na 或 H 之间的离子交换机制决定。总之，本文不仅报道了一种获取多孔磷酸锆的新型合成策略，还提出了一种用于 Sr 去除的有前途的吸附剂。
