Calcined hydrotalcite can be applied to remove anionic contaminants from aqueous systems such as antimony species due to its great anion exchange capacity and high surface area. Hence, this study evaluated antimonite and antimonate sorption-desorption processes onto calcined hydrotalcite in the presence of nitrate, sulfate and phosphate. Sorption and desorption experiments of antimonite and antimonate were carried out in batch equilibrium and the post-sorption solids were analyzed by X-ray Fluorescence (EDXRF). Sorption data were better fitted by dual-mode Langmuir-Freundlich model (R²>0.99) and desorption data by Langmuir model. High maximum sorption capacities were found for the calcined hydrotalcite, ranging from 617 to 790 meq kg⁻¹. The competing anions strongly affected the antimony sorption. EDXRF analysis and mathematical modelling showed that sulfate and phosphate presented higher effect on antimonite and antimonate sorption, respectively. High values for sorption efficiency (SE=99%) and sorption capacity were attributed to the sorbent small particles and the large surface area. Positive hysteresis indexes and low mobilization factors (MF>3%) suggest very low desorption capacity to antimony species from LDH. These calcined hydrotalcite characteristics are desirable for sorption of antimony species from aqueous solutions.

煅烧的水滑石由于其强大的阴离子交换能力和高表面积，可用于从水性体系（例如锑物种）中去除阴离子污染物。因此，本研究评估了在硝酸盐，硫酸盐和磷酸盐存在下，煅烧水滑石上锑矿和锑酸盐的吸附-解吸过程。锑矿和锑酸盐的吸附和解吸实验是分批进行的，并通过X射线荧光（EDXRF）分析了吸附后的固体。双模Langmuir-Freundlich模型（R ² > 0.99）和Langmuir模型的解吸数据更好地拟合了吸附数据。发现煅烧的水滑石具有高的最大吸附能力，范围从617至790 meq kg ^-1。竞争性阴离子强烈影响锑的吸附。EDXRF分析和数学建模表明，硫酸盐和磷酸盐分别对锑矿和锑酸盐的吸附作用更高。吸附效率高（SE = 99％）和吸附能力归因于吸附剂小颗粒和大表面积。正磁滞指数和低动员因子（MF > 3％）表明，LDH对锑物种的解吸能力非常低。这些煅烧的水滑石特性对于从水溶液中吸附锑物质是理想的。