In this research paper, Chitosan beads modified with Thiourea, Titanium Dioxide (TiO₂) and Magnetite (Fe₃O₄) nanoparticles were prepared for Naphthalene adsorption as a polycyclic aromatic hydrocarbon model. Magnetite and TiO₂ nanoparticles were prepared through co-precipitation and green chemistry method, respectively. Scanning electron microscopy (SEM) coupled to EDX detector allowed to obtain morphological information unmodified and modified beads, in which was observed the main elements introduced by the presence of Thiourea, TiO₂ and Fe₃O₄ nanoparticles. Magnetization study performed by a vibrating sample magnetometer (VSM) revealed superparamagnetic behavior was observed for Fe₃O₄ nanoparticles and Thiourea-Magnetite-TiO₂ modified chitosan beads (Cs-T-M-Ti). Also, textural properties were analyzed using BET and BJH methods. Adsorption, isotherms and kinetic studies in a batch system showed a maximum adsorption capacity of 133.690 mg/g for Cs-T-M-Ti beads because Fe₃O₄ and TiO₂ nanoparticles confer a larger surface and their constituent atoms generate Donor (D)-$\pi$-acceptor interactions. Adsorption isotherm was better described using the Freundlich model and Pseudo-second order was the kinetic model that better fitted to experimental data. The high adsorption capacity shown by Cs-T-M-Ti beads allows us to affirm that it is a material with potential application in combined adsorption/(photocatalysis or photo-Fenton) processes for the removal of organic contaminants or heavy metals reduction in industrial wastewater.

本文以硫脲，二氧化钛（TiO ₂）和磁铁矿（Fe ₃ O ₄）纳米粒子为改性对象，制备了壳聚糖微珠，作为多环芳烃模型用于萘的吸附。共沉淀法和绿色化学法分别制备了磁铁矿和TiO ₂纳米粒子。扫描电子显微镜（SEM）与EDX探测器耦合，可以获取未经修饰和修饰的珠子的形态信息，其中观察到硫脲，TiO ₂和Fe ₃ O ₄的存在引入了主要元素。纳米粒子。通过振动样品磁力计（VSM）进行的磁化研究表明，观察到Fe ₃ O ₄纳米颗粒和硫脲-磁铁矿-TiO ₂改性壳聚糖珠（Cs-TM-Ti）的超顺磁行为。另外，使用BET和BJH方法分析了结构特性。批处理系统中的吸附，等温线和动力学研究表明，Cs-TM-Ti珠的最大吸附容量为133.690 mg / g，这是因为Fe ₃ O ₄和TiO ₂纳米颗粒具有更大的表面，并且它们的构成原子产生施主（D）-$\pi$-受体相互作用。使用Freundlich模型可以更好地描述吸附等温线，而伪秒级动力学模型更适合实验数据。Cs-TM-Ti珠粒显示出高吸附能力，这使我们确认这是一种在联合吸附/（光催化或光芬顿）工艺中可以去除工业废水中有机污染物或重金属的材料。