Bagheri Ahmad, Khabbaz Shima H, Rafati Amir Abbas
Department of Chemistry, Semnan University, P.O. Box 35131-19111, Semnan, Iran.
Department of Physical Chemistry, Faculty of Chemistry and Petroleum Sciences, Bu-Ali Sina University, Hamedan, 6517838683, Iran.
Sci Rep. 2024 Sep 28;14(1):22511. doi: 10.1038/s41598-024-72859-1.
The removal of Sunset Yellow (E110) on natural zeolite and zeolite modified with the cationic surfactant cetyl pyridinium chloride (CPC) was studied using the adsorption method. The structural characteristics of the surfactant-modified zeolite (SMZ-CPC) were investigated using X-ray diffraction(XRD), Fourier transform infrared spectroscopy (FTIR), Brunauer-Emmett-Teller (BET) analysis, and the scanning electron microscopy (SEM) images. The effect of different parameters on the adsorption process, such as equilibration time and amount of adsorbent at 298 K, were determined using UV-Vis spectroscopy. The maximum dye removal percentage on SMZ-CPC was obtained with 0.08 g of adsorbent in 30 min. The results show that the zeolite modified with CPC surfactant (SMZ) has a higher adsorption capacity for Sunset Yellow than the unmodified zeolite (natural form). The experimental adsorption data were nonlinearly analyzed using isotherm equations such as Langmuir, Freundlich, Temkin, Langmuir-Freundlich (or Sips), and Extended Langmuir (EL). The experimental data were better fitted with the Sips isotherm. The adsorption kinetic data were analyzed using eight models in nonlinear forms: the pseudo-first-order (PFO), pseudo-second-order (PSO), integrated kinetic Langmuir (IKL), Elovich, intraparticle diffusion (IPD), mixed order rate equation (MOE), fractal-like pseudo-first-order (FL-PFO) and fractal-like pseudo-second-order (FL-PSO). According to the results of the coefficient of determination (R), Elovich kinetic model well expressed E110 adsorption onto SMZ-CPC. Most of the dye removal takes place in less than 5 min and the maximum adsorption capacity is 5.06 mg/g. The results of this study show that zeolite modified with cationic surfactant is an effective adsorbent for removal anionic dyes from an aqueous solution.
采用吸附法研究了天然沸石以及用阳离子表面活性剂十六烷基氯化吡啶（CPC）改性的沸石对日落黄（E110）的去除效果。利用X射线衍射（XRD）、傅里叶变换红外光谱（FTIR）、布鲁诺尔-埃米特-泰勒（BET）分析以及扫描电子显微镜（SEM）图像对表面活性剂改性沸石（SMZ-CPC）的结构特征进行了研究。使用紫外可见光谱法测定了不同参数（如298K下的平衡时间和吸附剂用量）对吸附过程的影响。在30分钟内使用0.08g吸附剂时，SMZ-CPC对染料的去除率达到最大值。结果表明，用CPC表面活性剂改性的沸石（SMZ）对日落黄的吸附能力高于未改性的沸石（天然形态）。利用朗缪尔、弗伦德利希、坦金、朗缪尔-弗伦德利希（或西普斯）和扩展朗缪尔（EL）等温方程对实验吸附数据进行了非线性分析。实验数据与西普斯等温线拟合效果更好。采用八种非线性形式的模型对吸附动力学数据进行了分析：伪一级（PFO）、伪二级（PSO）、积分动力学朗缪尔（IKL）、埃洛维奇、颗粒内扩散（IPD）、混合阶速率方程（MOE）、类分形伪一级（FL-PFO）和类分形伪二级（FL-PSO）。根据决定系数（R）的结果，埃洛维奇动力学模型能很好地描述E110在SMZ-CPC上的吸附过程。大部分染料在不到5分钟内被去除，最大吸附容量为5.06mg/g。本研究结果表明，阳离子表面活性剂改性沸石是从水溶液中去除阴离子染料的有效吸附剂。
