The photocatalytic activity of TiO₂/Fe₃O₄ nanocomposite has been determined. The XRD spectrum and FESEM analysis have been used to evaluate TiO2 / Fe3O4 nanoparticles. The photocatalytic activity of nanoparticles is assessed by degradation of the RR198 solution under the influence of UV-LED radiation. Response Surface Methodology (RSM) is employed to determine the relationships between the studied parameters. The experiments were designed and performed in two ways: One-factor-at-a-time method (OFAT) and Central composite design (CCD). Here nanoparticles with synergistic effect of S₂O₈^2- were very successful in eliminating the dye. The results of the RSM model with the two mentioned experiment design methods indicated that the model derived from the CCD method had a better predictive capability and favoured from the ability to generalize to other results rather than OFAT method.

中文翻译：

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UV-LED辐照下TiO2 / Fe3O4 /过硫酸盐纳米粒子去除RR198染料的比较及RSM建模中OFAT和CCD实验设计的比较

已经确定了TiO ₂ / Fe ₃ O ₄纳米复合材料的光催化活性。XRD光谱和FESEM分析已用于评估TiO2 / Fe3O4纳米粒子。通过在UV-LED辐射的影响下RR198溶液的降解来评估纳米颗粒的光催化活性。响应面方法论（RSM）用于确定研究参数之间的关系。实验的设计和执行有两种方式：一次一因素法（OFAT）和中央复合设计（CCD）。在此，具有S ₂ O ₈ ^2-协同作用的纳米颗粒在消除染料方面非常成功。采用上述两种实验设计方法的RSM模型的结果表明，从CCD方法获得的模型具有更好的预测能力，并且具有比OFAT方法更能推广到其他结果的能力。