Abstract

In this study, the use of clinoptilolite (natural zeolite) and Fe₃O₄ loaded clinoptilolite as adsorbents in the removal Methyl Violet from aqueous solutions were investigated and their adsorption capacities were compared. Primarily, the surface properties of the adsorbents were characterized by using spectroscopic techniques such as X-Ray Diffraction, Brunauer-Emmett-Teller, Scanning Electron Microscopy, and Fourier Transform Infrared Spectroscopy. Then, the effect of adsorption parameters such as initial pH value, adsorbent dosage, temperature, contact time, and initial concentration were investigated in order to optimize the adsorption parameters of these adsorbents. The experimental data indicated that the adsorption isotherms were well described by the Langmuir equilibrium isotherm model equation. The adsorption capacities of the clinoptilolite and the Fe₃O₄ loaded clinoptilolite were calculated as 135.13 and 153.85 mg g⁻¹, respectively. The adsorption of methyl violet was determined as compliance with the pseudo-second-order kinetic model. Thermodynamic calculations were made for both adsorbents. The calculated ΔH° values ​​are 11.65 and 11.96 kJ mol⁻¹ for clinoptilolite and Fe₃O₄ loaded clinoptilolite, respectively, indicating that the adsorption process was spontaneous and endothermic. In addition, the adsorbent was reused seven times with the regenerated adsorbent technique and Fe₃O₄ loaded clinoptilolite was recovered by desorption. All experimental results show that the Fe₃O₄ loaded clinoptilolite was a natural, low cost and easily applicable adsorbent in the removal of methyl violet from an aqueous solution.

摘要

在本研究中，使用斜发沸石（天然沸石）和 Fe ₃ O ₄研究了负载斜发沸石作为吸附剂从水溶液中去除甲基紫的作用，并比较了它们的吸附能力。首先，吸附剂的表面性质通过使用光谱技术来表征，例如 X 射线衍射、Brunauer-Emmett-Teller、扫描电子显微镜和傅里叶变换红外光谱。然后，研究了初始pH值、吸附剂用量、温度、接触时间和初始浓度等吸附参数的影响，以优化这些吸附剂的吸附参数。实验数据表明，吸附等温线很好地被朗缪尔平衡等温线模型方程描述。斜发沸石和Fe ₃ O _{4的吸附能力}负载的斜发沸石分别计算为 135.13 和 153.85 mg g ^-1。甲基紫的吸附被确定为符合准二级动力学模型。对两种吸附剂进行热力学计算。对于斜发沸石和负载Fe ₃ O ₄的斜发沸石，计算出的ΔH °值分别为11.65和11.96 kJ mol ^-1，表明吸附过程是自发的和吸热的。此外，吸附剂通过再生吸附剂技术重复使用7次，并通过解吸回收负载Fe ₃ O _{4的斜发沸石。}所有实验结果表明，Fe ₃ O₄负载斜发沸石是一种天然、低成本且易于应用的吸附剂，可用于从水溶液中去除甲基紫。