An iron(III)-polyvinyl chloride (PVC)-Schiff base adsorbent was prepared for removal of methyl orange (MO) as an anionic dye from the aqueous samples. PVC was reacted with ethylenediamine to prepare aminated PVC. Salicylaldehyde was then added to the aminated PVC to incorporate the Schiff base group into the polymer structure. This product was further reacted with iron (III) nitrate to form an iron complex as the modified PVC adsorbent (PVC-[Fe(EDA)(Sald)]). The prepared adsorbent was characterized by Fourier transform-infrared (FT-IR) spectroscopy, scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX), Brunauer-Emmett-Teller (BET) surface area analysis, and thermogravimetric analysis (TGA). The special parameters influencing the adsorption process such as the solution pH, contact time, initial dye concentration, and the solution temperature were investigated. Removal percentage (%R) and adsorption capacity (q_t) greater than 50% and 140 mg g⁻¹, respectively, were obtained under the following conditions: pH, 7;contact time, 150 min; dye concentration, 100 mg.L⁻¹; and solution temperature, 25 °C. The adsorption isotherm and kinetic data were well fitted by the Freundlich isotherm model and the pseudo-second-order kinetic model, respectively. The thermodynamic data revealed that the adsorption process was endothermic and spontaneous. The changes in entropy (ΔS°) and enthalpy (ΔH°) were calculated to be 0.110 kJ mol⁻¹ K⁻¹ and 31.011 kJ mol⁻¹, respectively. In this work, we developed for the first time the synthesis of an iron(III)-polyvinyl chloride (PVC)-Schiff base adsorbent that can be successfully used for removal of methyl orange from the aqueous sample. Furthermore, these findings showed that modified PVC was more efficient than neat PVC on MO removal for adsorption process.

制备了铁（III）-聚氯乙烯（PVC）-席夫碱吸附剂，用于从水性样品中去除作为阴离子染料的甲基橙（MO）。使PVC与乙二胺反应以制备胺化的PVC。然后将水杨醛添加到胺化的PVC中，以将席夫碱基团结合到聚合物结构中。该产物进一步与硝酸铁（III）反应形成铁络合物作为改性的PVC吸附剂（PVC- [Fe（EDA）（Sald）]）。制备的吸附剂通过傅立叶红外光谱（FT-IR），扫描电子显微镜（SEM），能量色散X射线光谱（EDX），Brunauer-Emmett-Teller（BET）表面积分析和热重分析进行表征（TGA）。影响吸附过程的特殊参数，例如溶液的pH值，接触时间，初始染料浓度，并研究溶液温度。去除率（％R）和吸附量（q在以下条件下分别获得大于50％和140mg g ^-1的_t）：pH，7；接触时间，150min；和pH值。染料浓度100 mg.L ^-1 ; 溶液温度为25°C。吸附等温线和动力学数据分别通过Freundlich等温线模型和伪二级动力学模型很好地拟合。热力学数据表明，吸附过程是吸热的和自发的。熵（ΔS°）和焓（ΔH°）的变化经计算为0.110 kJ mol ^-1  K ^-1和31.011 kJ mol ^-1， 分别。在这项工作中，我们首次开发了可成功用于从水性样品中去除甲基橙的铁（III）-聚氯乙烯（PVC）-席夫碱吸附剂的合成方法。此外，这些发现表明，改性的PVC在吸附过程中的MO去除方面比纯PVC更有效。