Segregation of NaBr in NaBr/NaCl crystals grown from aqueous solutions: Implications for sea salt surface chemistry
Segregation of NaBr in NaBr/NaCl crystals grown from aqueous solutions: Implications for sea salt surface chemistry
复制标题
从水溶液中生长的 NaBr/NaCl 晶体中 NaBr 的偏析：对海盐表面化学的影响
DOI：
10.1029/2000gl012539
复制
发表时间：
2001
影响因子：
5.2
通讯作者：
J. Pemberton
中科院分区：
文献类型：
--
作者：
C. Zangmeister;J. Turner;J. Pemberton
研究了从含溴水溶液中析出的NaBr/氯化钠混合晶体中NaBr的表面偏析。用X射线光电子能谱(XPS)、扫描电子显微镜(SEM)、能量色散X射线荧光(EDX)和原子力显微镜(AFM)对晶体进行了研究。结果表明，当海水中的溴：氯值为1：660时，NaBrR表面偏析，覆盖了4-5%的表面。表面NaBr：NaCl值是体晶体的∼值的35倍。NaBr表面形成平均尺寸为635 nm×635 nm×53 nm的磁区。表面的大片区域含有氯化钠，没有检测到NaBrR。在海盐颗粒中发现的所有溴很可能发生完全的表面分离，从而使更多的溴可用于与气相成分的表面反应，而不是基于主体成分的预测。
Surface segregation of NaBr in mixed NaBr/NaCl crystals precipitated from aqueous solutions containing Br is investigated. Crystals were grown from solutions of a wide range of Br:Cl values and studied using x‐ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), energy‐dispersive x‐ray fluorescence (EDX), and atomic force microscopy (AFM). Results indicate that NaBr surface‐segregates to cover 4–5% of the surface at the Br:Cl value found in sea water (1:660). The surface NaBr:NaCl values are ∼35 times higher those of the bulk crystals. The surface NaBr forms domains of average size 635 nm × 635 nm × 53 nm. Large areas of the surface contain NaCl with no detectable NaBr. Complete surface segregation of all Br found in sea salt particles is likely to occur, thereby making a greater amount of Br available for surface reactions with gas‐phase constituents than would be predicted based on bulk composition.