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纳米硅钛酸钠去除水溶液中 Pb(II)的新方法：动力学研究及热力学行为。

New Approaches for Pb(II) Removal from Aqueous Media Using Nanopowder Sodium Titanosilicate: Kinetics Study and Thermodynamic Behavior.

机构信息

Chemistry and Chemical Engineering Department, Ovidius University of Constanta, 900527 Constanta, Romania.

Electron Microscopy Laboratory, Department of Physics, Ovidius University of Constanta, 900527 Constanta, Romania.

出版信息

Int J Mol Sci. 2023 Sep 7;24(18):13789. doi: 10.3390/ijms241813789.

DOI:10.3390/ijms241813789
PMID:37762092
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC10530816/
Abstract

Microporous sodium titanosilicate, NaTiSiO, has been successfully prepared using the sol-gel method. The structural and morphological characterization of synthesized product has been made via thermal analyses (TG-DTG), X-ray diffraction (XRD), and electron microscopy (SEM and TEM). Adsorption properties of the synthesized NaTiSiO nanopowder for Pb(II) removal of aqueous media was investigated in different experimental conditions such as the contact time, the initial metal concentration, the pH, and the temperature. The Pb(II) adsorption on NaTiSiO was discussed according to the kinetics and thermodynamics models. The adsorption kinetics of Pb(II) have been better described by the PS-order kinetic model which has the highest fitting correlation coefficients (R: 0.996-0.999) out of all the other models. The adsorption results have been successfully fitted with the Langmuir and Redlich-Paterson models (R: 0.9936-0.9996). The calculated thermodynamic parameters indicate that the Pb(II) adsorption is an endothermic process, with increased entropy, having a spontaneous reaction. The results have revealed a maximum adsorption capacity of 155.71 mg/g at 298 K and a very high adsorption rate at the beginning, more than 85% of the total amount of Pb(II) being removed within the first 120 min, depending on the initial concentration.

摘要

采用溶胶-凝胶法成功制备了微孔钛硅酸钠，NaTiSiO。通过热分析（TG-DTG）、X 射线衍射（XRD）和电子显微镜（SEM 和 TEM）对合成产物的结构和形态特征进行了表征。在不同的实验条件下，如接触时间、初始金属浓度、pH 值和温度，研究了合成的 NaTiSiO 纳米粉末对水溶液中 Pb(II)的吸附性能。根据动力学和热力学模型讨论了 Pb(II)在 NaTiSiO 上的吸附。Pb(II)的吸附动力学更符合 PS 级动力学模型，该模型的拟合相关系数（R：0.996-0.999）最高，高于所有其他模型。吸附结果成功地符合 Langmuir 和 Redlich-Paterson 模型（R：0.9936-0.9996）。计算得到的热力学参数表明，Pb(II)的吸附是一个吸热过程，熵增加，是一个自发反应。结果表明，在 298 K 时最大吸附容量为 155.71mg/g，吸附速率非常高，在最初的 120 分钟内，超过 85%的 Pb(II)被去除，这取决于初始浓度。

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