在这项研究中,一种新的机械工艺被用来生产纤维素珠(CB)。然后用钴铁氧体纳米颗粒(CoFe2O4NP)掺杂这些珠子,以用作通过过氧单硫酸盐(PMS)活化降解罗丹明B(RhB)的催化剂。用X射线衍射(XRD)对CoFe2O4和CoFe2O4@CB催化剂的理化性质进行了表征,傅里叶变换红外光谱(FT-IR),扫描电子显微镜(SEM)结合能量色散X射线光谱仪(EDX),和扫描透射电子显微镜(STEM)技术,和热重分析(TGA)。为了优化RhB降解效率,采用响应面法(RSM),利用Box-Behnken设计(BBD)。在催化剂用量为0.40g/L的优化条件下,PMS剂量为0.98mM,RhB浓度为40mg/L,pH为5.27,反应时间为60min,在25°C的温度下实现了98.51%的显著降解效率。在淬火实验中,1O2,SO4•-,和HO•物种在CoFe2O4@CB/PMS系统中产生,以1O2和SO4·-物种主导RhB降解。值得注意的是,新型CoFe2O4@CB催化剂表现出卓越的稳定性和可重用性,通过回收测试(5个循环实验后高达78%的RhB降解效率)和随后的表征(FTIR,SEM,和EDX)强调不变的波段,均匀分布,和重复使用周期后的一致成分。这些结果证明了机械生产的CoFe2O4@CB催化剂用于高级氧化过程(AOPs)的有效性,在废水处理中具有广阔的应用前景。
In this study, a novel mechanical process was used to produce cellulose beads (CB). These beads were then doped with cobalt ferrite nanoparticles (CoFe2O4 NPs) to serve as catalysts for the degradation of rhodamine B (RhB) through peroxymonosulfate (PMS) activation. The physical and chemical properties of CoFe2O4 and CoFe2O4@CB catalysts were characterized using X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM) combined with energy dispersive X-ray spectrometer (EDX), scanning transmission electron microscopy (STEM) techniques, and thermogravimetric analysis (TGA). To optimize RhB degradation efficiency, Response Surface Methodology (RSM) was employed, utilizing the Box-Behnken design (BBD). Under the optimized conditions of a catalyst dosage of 0.40 g/L, PMS dosage of 0.98 mM, RhB concentration of 40 mg/L, pH of 5.27, and reaction time of 60 min, a remarkable degradation efficiency of 98.51 % was achieved at a temperature of 25 °C. In quenching experiments, 1O2, SO4•-, and HO• species are produced in the CoFe2O4@CB/PMS system, with 1O2, and SO4•- species dominating RhB degradation. Remarkably, the new CoFe2O4@CB catalyst has demonstrated exceptional stability and reusability, validated by recycling tests (up to 78 % of RhB degradation efficiency after a 5-cycle experiment) and subsequent characterizations (FTIR, SEM, and EDX) emphasizing unchanged bands, uniform distribution, and consistent composition after reuse cycles. These results demonstrate the effectiveness of mechanically produced CoFe2O4@CB catalysts for advanced oxidation processes (AOPs), with promising applications in wastewater treatment.