BACKGROUND:Removal of radioactive substances, such as cesium (Cs) and strontium (Sr), has become an emerging issue after the Fukushima Daiichi nuclear power plant disaster. It has been reported that hydroxyapatite (HA) and aluminosilicate composite powders can be used to remove Cs and Sr. However,the film type of these materials for the removal of Cs and Sr has not been reported. OBJECTIVE:The aim of this study was to assess the possibility of using HA, aluminosilicate, and aluminosilicate/HA composites for the removal of Cs and Sr radioactive substances. METHODS:Aluminosilicate films and HA films were fabricated using a sputtering technique with diatomaceous earth and HA targets, respectively. The aluminosilicate film was observed by X-ray diffraction (XRD) and scanning electron microscopy (SEM). A comb-shaped HA/aluminosilicate composite film was prepared to take advantage of the adsorption properties of the HA and the aluminosilicate films. The Cs and Sr adsorption on these films were also evaluated. RESULTS:In the XRD patterns, the film sputtered from a diatomaceous earth target under 5.0 Pa of Ar pressure showed aluminosilicate peaks (Na1.82(Al2Si3O10) and Al2SiO5) after 8 h of vapor-phase hydrothermal treatment. The film showed higher adsorption of Cs than Sr in Cs and Sr solutions, while the HA film adsorbed far more Sr than Cs. A HA/aluminosilicate composite film was successfully fabricated, and the SEM images showed that the width of the HA region was 230–260 μm, and that of the aluminosilicate region was 170–200 μm. The HA/aluminosilicate composite film showed 84.8 ± 11.5% Cs adsorption and 28.3 ± 1.4% Sr adsorption in a mixed solution of Cs and Sr. CONCLUSION:This study shows the feasibility of using HA films, aluminosilicate films, and HA/aluminosilicate composite films for the removal of radioactive substances such as Cs and Sr.

中文翻译：

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溅射法制备铝硅酸盐和羟基磷灰石/铝硅酸盐复合薄膜及其对铯、锶的吸附能力

背景：福岛第一核电站灾难后，铯（Cs）和锶（Sr）等放射性物质的去除已成为一个新问题。已有报道称羟基磷灰石(HA)和铝硅酸盐复合粉体可用于去除Cs和Sr，但这些材料用于去除Cs和Sr的薄膜类型尚未见报道。目的：本研究的目的是评估使用 HA、铝硅酸盐和铝硅酸盐/HA 复合材料去除 Cs 和 Sr 放射性物质的可能性。方法：分别使用溅射技术与硅藻土和 HA 靶材制备铝硅酸盐薄膜和 HA 薄膜。通过X射线衍射（XRD）和扫描电子显微镜（SEM）观察铝硅酸盐薄膜。利用HA和铝硅酸盐薄膜的吸附特性，制备了一种梳状HA/铝硅酸盐复合薄膜。还评估了这些薄膜上的 Cs 和 Sr 吸附。结果：在 XRD 图中，在 5.0 Pa 的 Ar 压力下从硅藻土靶溅射的薄膜在气相水热处理 8 小时后显示出铝硅酸盐峰（Na1.82(Al2Si3O10) 和 Al2SiO5）。该薄膜在 Cs 和 Sr 溶液中表现出比 Sr 更高的 Cs 吸附，而 HA 薄膜吸附的 Sr 远多于 Cs。成功制备了HA/铝硅酸盐复合薄膜，SEM图像显示HA区域的宽度为230-260 μm，铝硅酸盐区域的宽度为170-200 μm。HA/铝硅酸盐复合膜表现出 84.8 ± 11.5% Cs 吸附和 28.3 ± 1。