Uranium (VI), as a toxic contaminant, is a potential detriment to human health and environmental safety. In this experiment, carboxymethyl cellulose/Ca-rectorite composite material (Ca-REC/CMC) was prepared by crosslinking reaction to remove U(VI) from the liquid. The crystal structure was detected by X-ray diffraction (XRD) and surface structure and morphology of the materials were investigated by scanning electron microscopy (SEM). The surface functional groups of prepared materials were detected by Fourier transform infrared spectroscopy (FT-IR). The adsorption capacity of Ca-REC/CMC improved obviously after being modified by CMC. The adsorption capacity of Ca-REC/CMC was closely related to ionic strength and pH. According to thermodynamic parameter calculation, the adsorption process was endothermic and spontaneous. Adsorption isotherms could be depicted perfectly by the Langmuir model. Ca-REC/CMC maintained stability and regeneration after recycling six times. The adsorption mechanism, including electrostatic interactions and ionic interaction, was investigated by the X-ray photoelectron spectroscopy (XPS). Ca-REC/CMC is considered as remarkable potential material for removing U(VI) from the water environment.

中文翻译：

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使用羧甲基纤维素改性的Ca-雷托石杂化复合材料从水溶液中去除U(VI)

铀 (VI) 作为一种有毒污染物，对人类健康和环境安全具有潜在危害。在本实验中，通过交联反应从液体中去除 U(VI) 制备了羧甲基纤维素/Ca-雷托石复合材料（Ca-REC/CMC）。通过X射线衍射（XRD）检测晶体结构，并通过扫描电子显微镜（SEM）研究材料的表面结构和形貌。通过傅里叶变换红外光谱（FT-IR）检测制备材料的表面官能团。CMC改性后Ca-REC/CMC的吸附能力明显提高。Ca-REC/CMC 的吸附能力与离子强度和 pH 值密切相关。根据热力学参数计算，吸附过程是吸热自发的。Langmuir 模型可以完美地描述吸附等温线。Ca-REC/CMC 在循环六次后仍保持稳定性和再生性。通过X射线光电子能谱（XPS）研究了吸附机制，包括静电相互作用和离子相互作用。Ca-REC/CMC 被认为是从水环境中去除 U(VI) 的显着潜在材料。