Vibrational Spectroscopy Study of Selenate and Sulfate Adsorption Mechanisms on Fe and Al (Hydr)oxide Surfaces.
Vibrational Spectroscopy Study of Selenate and Sulfate Adsorption Mechanisms on Fe and Al (Hydr)oxide Surfaces.
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DOI：
10.1006/jcis.2000.6960
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发表时间：
2000-09
影响因子：
9.9
通讯作者：
H. Wijnja;C. P. Schulthess
中科院分区：
文献类型：
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作者：
H. Wijnja;C. P. Schulthess
利用拉曼光谱和衰减全反射-傅立叶变换红外光谱研究了硒酸根（SeO（4））和硫酸根（SO（4））在针铁矿和氧化铝表面的配位和形态。拉曼光谱是从含有4 mM SeO（4）或SO（4）的悬浮液糊状物中收集的。对于SO（4），通过ATR-FTIR光谱法在含有1 mM SO（4）的针铁矿系统和含有4 mM SO（4）的氧化铝系统中收集补充数据。拉曼和ATR-FTIR光谱的组合数据集表明，SeO（4）和SO（4）的内球和外球表面复合物都出现在这些金属（氢）氧化物表面上。这些光谱数据表明，SeO（4）和SO（4）在同一吸附剂上具有相似的络合行为。在针铁矿，这些主要形成单齿的内球表面络合物在pH 6这些阴离子主要存在作为外层表面络合物。相反，在Al氧化物上，这些阴离子主要以外层表面络合物的形式存在，但在pH <6时也有一小部分以内层络合物的形式存在。这些阴离子对针铁矿和铝氧化物的光谱强度的比较表明，这些阴离子与铝氧化物的络合作用弱于与氧化铁。版权所有2000学术出版社。
The coordination and speciation of selenate (SeO(4)) and sulfate (SO(4)) on goethite and Al oxide were studied using Raman and ATR-FTIR spectroscopy. Raman spectra were collected from pastes of suspensions containing 4 mM SeO(4) or SO(4). For SO(4), complementary data were collected by ATR-FTIR spectroscopy in goethite systems with 1 mM SO(4) and in Al oxide systems with 4 mM SO(4). The combined data set of Raman and ATR-FTIR spectra indicate that both inner- and outer-sphere surface complexes of SeO(4) and SO(4) occur on these metal (hydr)oxide surfaces. These spectral data show that SeO(4) and SO(4) have a similar complexation behavior on the same adsorbent. On goethite, these form predominantly monodentate inner-sphere surface complexes at pH 6 these anions exist predominantly as outer-sphere surface complexes. On Al oxide, in contrast, these anions exist predominantly as outer-sphere surface complexes, but a small fraction is also present as an inner-sphere complex at pH <6. A comparison of the spectral intensities of these anions on goethite and Al oxide shows that complexation of these anions with Al oxide is weaker than with Fe oxide. Copyright 2000 Academic Press.