A comparative adsorption study of benzophenone-3 onto synthesized lipophilic organosilicate, Laponite and montmorillonite
A comparative adsorption study of benzophenone-3 onto synthesized lipophilic organosilicate, Laponite and montmorillonite
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DOI：
10.1016/j.clay.2019.01.005
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发表时间：
2019-03
影响因子：
5.6
通讯作者：
Saddam Charaabi;Lucien Tchara;Christelle Marminon;Z. Bouaziz;Gérard Holtzinger;A. Pensé-Lhéritier;M. Le Borgne;S. Issa
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文献类型：
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作者：
Saddam Charaabi;Lucien Tchara;Christelle Marminon;Z. Bouaziz;Gérard Holtzinger;A. Pensé-Lhéritier;M. Le Borgne;S. Issa
本文研究了亲油有机硅（OSL）、锂皂石（Lap）和蒙脱土（Mt）三种吸附剂对疏水分子二苯甲酮-3（BZ-3）的吸附。对所有吸附剂进行了比较研究，并进行了批量吸附实验，以确定最佳条件。考察了溶剂、pH值、温度、BZ-3初始浓度和接触时间等主要实验参数对分离效果的影响。通过配备有UV检测器的HPLC分析来评估吸附能力，并且通过动态光散射（DLS）分析和衰减全反射-傅里叶变换红外（ATR-FTIR）光谱来表征吸附剂- BZ-3络合物。最后，用Langmuir、Freundlich和Temkin模型对吸附等温线进行了描述。结果表明，以乙醇为溶剂，BZ-3浓度为2.5 g/L，pH为10，温度为38 °C，吸附时间为24 h时，所有吸附剂对BZ-3的吸附量最大。所获得的结果显示，与Lap（137 mg/g）和Mt（192.3 mg/g）相比，OSL吸附BZ-3的有希望的能力（340 mg BZ-3/g吸附剂）。Langmuir模型与OSLand Mt吸附的拟合效果最好，Freundlich模型与Lap吸附的拟合效果最好。
In this study, the adsorption of a hydrophobic molecule, benzophenone-3 (BZ-3) was investigated onto three adsorbents: synthesized lipophilic organosilicate (OSL), Laponite (Lap) and montmorillonite (Mt). A comparative study for all adsorbents with batch adsorption experiments was achieved to determine the optimal conditions. The effects of the main experimental parameters were determined such as solvent, pH, temperature, initial concentration of BZ-3 and contact time. The adsorption capacity was evaluated by means of HPLC analysis equipped with UV detection and the adsorbent - BZ-3 complexes were characterized by means of Dynamic Light Scattering (DLS) analysis and Attenuated Total Reflectance - Fourier Transform InfraRed (ATR - FTIR) spectroscopy. Finally, the adsorption isotherm equilibrium was described according to Langmuir, Freundlich and Temkin models. The results showed that optimal value of the adsorbed BZ-3 for all adsorbents was found at pH 10, at 38 °C, with BZ-3 concentration of 2.5 g/L during 24 h of contact time using ethanol as a solvent. The results obtained showed a promising capacity of the OSLto adsorb BZ-3 (340 mg of BZ-3/g of adsorbent) compared to Lap (137 mg/g) and Mt (192.3 mg/g). Langmuir model fitted the best with OSLand Mt adsorption while Freundlich model fitted the best with Lap adsorption.