通过实验和初步分子动力学模拟,通过CoAl LDH对酸盐吸附机制的研究
Jaehyuk Kang1, Jueun Kim2, Byoungkwan Kim3
1Department of Nuclear Engineering, Jeju National University, 102, Jejudaehak-ro, Jeju-si, Jeju-do 63243, Republic of Korea; Major of Energy and Chemical Engineering, Faculty of Applied Energy System, Jeju National University, 102, Jejudaehak-ro, Jeju-si, Jeju-do 63243, Republic of Korea; Division of Advanced Nuclear Engineering, Pohang University of Science and Technology, 77 Chongam-ro, Nam-gu, Pohang-si, Gyeongsangbuk-do 37673, Republic of Korea.
-层双氧化物 (CoAl LDH) 有效地从核废物中去除酸盐 (IO3−). 这项研究揭示了原子水平的机制,使得先进的放射性废物处理材料的设计成为可能.
科学领域:
- 材料科学 材料科学 材料科学
- 环境化学环境化学
- 核化学 核化学 核化学
背景情况:
- 放射性从核燃料循环中构成持续的辐射危险.
- 有效的酸盐 (IO3−) 封存对于放射性废物管理至关重要.
研究的目的:
- 为了阐明-层双氧化物 (CoAl LDH) 的IO3−吸收机制.
- 为设计先进的放射性废物处理吸附剂提供原子规模的见解.
主要方法:
- 控制pH的吸附实验.
- 同步射线X射线吸收细结构 (XAFS) 光谱学.
- 基于密度函数理论 (DFT) 的Ab Initio分子动力学 (AIMD) 模拟.
主要成果:
- 在pH~6下,CoAl LDH实现了~90%的IO3−去除,分布系数为1.7×104mL/g.
- 埃克萨弗斯分析证实-氧键长度为1.81 Å,协调号为3.
- 模拟显示了质子跳跃和转移稳定的IOH物种,证实了酸盐与酸盐的交换是捕获途径.
结论:
- 在近乎中性的条件下,CoAl LDH快速而有选择地将IO3−隔离起来.
- 原子尺度的理解指导了放射性废物处理的分层吸附剂的理性工程.
- 水分子调解质子迁移,保持宿主晶格结构.
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