A simple route for preparation of organically modified spherical silica (SiO₂) nanoparticles with CYANEX 921 has been discussed. These modified particles has been used to remove Fe³⁺-SCN complex from 9M phosphoric acid. SEM, XRD, IR and EDS have been used to Characterized the powder in its several stages. The effect of SiO₂ weight, thiocyanate concentration, initial Fe (III) concentration, H₃PO₄ concentration, stirring time, temperature and loaded SiO₂ weight have been used to study the removal percent. The loaded silica succeeded in removal of 70% of Fe (III). Langmuir isotherm model well fit the experimental data with maximum sorption capacity 45.45 mg/g. The reaction kinetic is found to follow the pseudo second order kinetic model the adsorption reaction shows exothermic behavior.

中文翻译：

---

装有CYANEX-921的纳米二氧化硅颗粒，用于从磷酸中去除铁（III）

讨论了用CYANEX 921制备有机改性的球形二氧化硅（SiO ₂）纳米颗粒的简单方法。这些改性的颗粒已经用于从9M磷酸中去除Fe ³⁺ -SCN络合物。SEM，XRD，IR和EDS已被用于表征粉末的几个阶段。SiO ₂重量，硫氰酸盐浓度，初始Fe（III）浓度，H ₃ PO ₄浓度，搅拌时间，温度和SiO ₂负载量的影响重量已用于研究去除率。负载的二氧化硅成功去除了70％的Fe（III）。Langmuir等温模型非常适合实验数据，最大吸附容量为45.45 mg / g。发现反应动力学遵循伪二级动力学模型，吸附反应显示出放热行为。