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本文用穆斯堡尔效应对海水提铀吸附剂水合氧化钛中铁(～2％)的存在状态进行了研究。对水合氧化钛原始样品及180℃、340℃、1000℃下煅烧后的样品进行了室温和液氮温度下的穆斯堡尔谱的测量,确认Fe以γ-FeOOH形式存在。它们的穆斯堡尔谱不论煅烧与否,都呈现出一个双峰。在室温和液氮温度下其穆斯堡尔参数:同质异能移位分别等于0.37mms~(-1),0.49mms~(-1);四极分裂分别等于0.62mms~(-1),0.68mms~(-1)。样品在加热到1000℃时未观察到由γ—FeOOH分解生成的Fe_2O_3的六指谱,本文对其原因作了分析。煅烧后在室温和液氮温度下的穆斯堡尔参数:同质异能移位分别等于0.39±0.02mms~(-1),0.45±0.02mms~(-1);四极分裂分别等于0.70±0.02mms~(-1),0.71±0.02mms~(-1)。此结果与X-射线衍射和差热分析一致。本文还对γ-FeOOH在吸附铀性能上可能起的两种作用进行了探讨。
In this paper, the presence of iron (~ 2%) in the hydrated titanium oxide of uranium adsorbent extracted by seawater was investigated by the Mössbauer effect. The Mossbauer spectra of the samples of hydrated titanium oxide and the samples calcined at 180 ℃, 340 ℃ and 1000 ℃ were measured at room temperature and liquid nitrogen temperature to confirm the existence of Fe in the form of γ-FeOOH. Their Mossbauer spectra show a double peak regardless of calcination. The Mossbauer parameters at room temperature and liquid nitrogen temperature show that the displacement of homogeneous energy is equal to 0.37mms -1 and 0.49mms -1 respectively, and the quadrupole split is equal to 0.62mms -1, , 0.68mms ~ (-1). The sample was heated to 1000 ℃ did not observe by the decomposition of Fe-FeOOH generated six fingerprints spectrum, the reasons for this article were analyzed. The Mossbauer parameters at room temperature and liquid nitrogen temperature after calcination were 0.39 ± 0.02mms -1 and 0.45 ± 0.02mms -1, respectively. The quadrupole fissures were equal to 0.70 ± 0.02mms -1, 0.71 ± 0.02mms -1. This result is consistent with X-ray diffraction and differential thermal analysis. The paper also discussed the possible roles of γ-FeOOH in the adsorption of uranium.