In the present work three different natural materials and their modifications were studied for fluoride removal from aqueous solutions. The materials employed were: clinoptilolite (C), montmorillonite (M) and pumice (P), the minerals were modified with Fe³⁺ and Al³⁺ and heated at temperatures of 200, 500 and 800 °C. They were characterized by thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), X-ray powder diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS), specific surface area by Branauer Emmett and Teller method (BET) and points of zero charge (pzc). Adsorption experiments were carried out in batch system to obtain the adsorption capacity of each material and evaluate the leaching of iron and aluminum after adsorption processes, throughout the quantification of Fe³⁺ and Al³⁺ in the supernatants. The results obtained indicated the following adsorption capacity order: M (1.008 mg/g)>aluminum-modified materials > iron-modified materials > C > P.

在目前的工作中，研究了三种不同的天然材料及其改性物，用于从水溶液中去除氟化物。使用的材料是：斜发沸石（C），蒙脱石（M）和浮石（P），用Fe ³⁺和Al ³⁺改性矿物并在200、500和800°C的温度下加热。通过热重分析（TGA），差示扫描量热法（DSC），X射线粉末衍射（XRD），扫描电子显微镜（SEM），能量色散X射线光谱（EDS），Branauer Emmett和柜员方法（BET）和零电荷点（pzc）。在整个上清液中Fe ³⁺和Al ³⁺的定量分析中，分批进行吸附实验以获得每种材料的吸附能力，并评估吸附过程后铁和铝的浸出。所得结果表明，其吸附容量顺序为：M（1.008 mg / g）>铝改性材料>铁改性材料> C> P.