In the present article, the adsorbent prepared from laterite with lanthanum and cerium oxides (La₂O₃-CeO₂/laterite (LCL)) was efficiently employed for the removal of arsenite and fluoride from an aqueous environment. The obtained materials were characterized by XRD, SEM, and nitrogen adsorption/desorption. The synthesized LCL exhibited a high adsorption capacity towards arsenite (As(III)) and fluoride. The adsorption of both analytes on LCL, which was well-fitted to a pseudo-second-order equation, was found to be kinetically fast in the first 20 minutes and reached equilibrium at around 180 minutes. Weber’s intraparticle diffusion model in multilinearity using the piecewise linear regression combined with Akaike’s criteria was addressed. The adsorption capacities of LCL calculated from Langmuir’s isotherm model were found to be 67.08 mg·g^-1 for arsenite and 58.02 mg·g^-1 for fluoride. Thermodynamic parameters presented an endothermic nature of arsenite adsorption but an exothermic nature for fluoride and a negative Gibbs free energy for the spontaneous process of arsenite or fluoride adsorption at the studied temperature range. The excellent adsorption performance and stability make the composite of laterite and La-Ce binary oxides an alternative efficient and cheap adsorbent for the removal of arsenite and fluoride in an aqueous solution.

中文翻译：

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通过吸附在 La2O3-CeO2/红土上去除氟化物和亚砷酸盐

在本文中，由红土与镧和铈的氧化物（La ₂ O ₃ -CeO ₂ /红土（LCL））制备的吸附剂被有效地用于从水性环境中去除亚砷酸盐和氟化物。通过XRD、SEM和氮吸附/解吸对所得材料进行表征。合成的 LCL 对亚砷酸盐 (As(III)) 和氟化物表现出高吸附能力。两种分析物在 LCL 上的吸附，非常适合假-二阶方程，被发现在前 20 分钟动力学快速，并在大约 180 分钟达到平衡。讨论了使用分段线性回归与 Akaike 标准相结合的多重线性中的韦伯粒子内扩散模型。由朗缪尔等温线模型计算的 LCL 的吸附容量为 67.08 mg·g ^-1对亚砷酸盐和 58.02 mg·g ^-1对于氟化物。热力学参数显示亚砷酸盐吸附的吸热性质，但氟化物的放热性质和亚砷酸盐或氟化物吸附在研究温度范围内的自发过程的负吉布斯自由能。优异的吸附性能和稳定性使红土和La-Ce二元氧化物的复合物成为去除水溶液中亚砷酸盐和氟化物的替代高效且廉价的吸附剂。