Alharthi Sarah, Bibi Tahira, Santali Eman Y, Ali Ashraf
Department of Chemistry, College of Science, Taif University Taif 21944 Saudi Arabia.
Research Center of Basic Sciences, Engineering and High Altitude, Taif University Taif 21944 Saudi Arabia.
Nanoscale Adv. 2025 Jul 1. doi: 10.1039/d5na00436e.
The widespread occurrence of dibutyl phthalate (DBP) in aquatic systems demands effective remediation approaches. This study developed a novel magnetic adsorbent (FeO@SiO-R) through the surface functionalization of silica-coated iron oxide nanoparticles with octadecyl silane and (3-aminopropyl)trimethoxy silane (APTMS) to incorporate both hydrophobic and hydrophilic groups. Comprehensive characterization (SEM, XRD, FTIR, XPS) confirmed the successful synthesis of the adsorbent. Batch adsorption experiments systematically evaluated the DBP removal across different water matrices (river water, municipal and industrial wastewater), examining the effect of concentration, contact time, adsorbent dose, and pH effects. The adsorbent demonstrated exceptional performance with a maximum adsorption capacity of 645.43 mg g and removal efficiencies of 98.4%, 94.2%, and 88.7% in the respective matrices, reducing DBP to <6 μg L. The process simultaneously decreased the total organic content (TOC) by 18% and chemical oxygen demand (COD) by 22%, indicating effective co-removal of the organic pollutants. Adsorption followed the Langmuir isotherm ( = 0.994) and pseudo-second-order kinetics, suggesting monolayer chemisorption. Remarkably, after 30 reuse cycles, the removal efficiency decreased by only 20%, demonstrating excellent reusability. Comparative analysis revealed that the adsorbent outperformed many existing materials in terms of adsorption capacity and operational simplicity. These findings highlight FeO@SiO-R as an efficient adsorbent for plasticizer removal, with significant potential for practical water treatment applications while supporting SDG targets for clean water.
邻苯二甲酸二丁酯（DBP）在水生系统中广泛存在，这就需要有效的修复方法。本研究通过用十八烷基硅烷和（3-氨丙基）三甲氧基硅烷（APTMS）对二氧化硅包覆的氧化铁纳米颗粒进行表面功能化，开发了一种新型磁性吸附剂（FeO@SiO-R），以同时引入疏水和亲水基团。综合表征（扫描电子显微镜、X射线衍射、傅里叶变换红外光谱、X射线光电子能谱）证实了吸附剂的成功合成。批量吸附实验系统地评估了在不同水基质（河水、城市和工业废水）中DBP的去除情况，考察了浓度、接触时间、吸附剂剂量和pH值的影响。该吸附剂表现出优异的性能，最大吸附容量为645.43 mg/g，在各自的基质中去除效率分别为98.4%、94.2%和88.7%，将DBP降低至<6 μg/L。该过程同时使总有机含量（TOC）降低了18%，化学需氧量（COD）降低了22%，表明对有机污染物有有效的协同去除作用。吸附遵循朗缪尔等温线（ = 0.994）和准二级动力学，表明为单层化学吸附。值得注意的是，经过30次重复使用循环后，去除效率仅下降了20%，显示出优异的可重复使用性。对比分析表明，该吸附剂在吸附容量和操作简便性方面优于许多现有材料。这些发现突出了FeO@SiO-R作为一种去除增塑剂的高效吸附剂，在实际水处理应用中具有巨大潜力，同时支持清洁水的可持续发展目标。
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