Preparation and catalytic properties of CoFe2O4@PDA@Pt magnetic composite with core shell structure
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摘要: 采用溶剂热法制备磁性CoFe2O4亚微球,以CoFe2O4为核在碱性条件下将多巴胺(DA)聚合在其表面,利用乙二醇和聚多巴胺(PDA)的多羟基还原性,将Pt原位还原负载在CoFe2O4@PDA表面,合成纳米核壳型CoFe2O4@PDA@Pt复合材料。利用TEM、XRD、振动样品磁强计(VSM)和XPS对CoFe2O4@PDA@Pt复合材料的微观形貌、结构和晶型等进行表征。以无机染料铁氰酸钾和有机染料对硝基苯酚为目标污染物,探究CoFe2O4@PDA@Pt复合材料的催化活性。结果表明,2 min内CoFe2O4@PDA@Pt复合材料对铁氰酸钾降解率为95%以上,对对硝基苯酚降解率约为99.3%。Abstract: Magnetic CoFe2O4 submicrospheres were prepared by solvothermal method, and dopamine (DA) was polymerized on the surface under alkaline conditions with CoFe2O4 as the core. The polyhydroxyl reducibility of ethylene glycol and polydopamine (PDA) was used to reduce the Pt in situ on the surface of CoFe2O4@PDA to synthesize nano CoFe2O4@PDA@Pt composite. The micro morphology, structure and crystal morphology of the CoFe2O4@PDA@Pt composites were characterized by TEM, XRD, vibration sample magnetometer (VSM) and XPS. The catalytic activity of inorganic dye potassium ferrocyanate and organic dye p-nitrophenol were investigated as the target pollutants. The results show that the degradation rate of potassium ferrocyanate is over 95% and the degradation rate of p-nitrophenol is about 99.3% within 2 minutes.
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Key words:
- magnetic composites /
- Pt nanoparticles /
- catalyze /
- synergy /
- degradation
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图 7 对硝基苯酚及对硝基酚钠紫外-可见光图谱(a); 无催化剂的对硝基苯酚紫外-可见光图谱(b); CoFe2O4@PDA@Pt复合材料催化对硝基苯酚的降解曲线(c); NaBH4还原对硝基苯酚的准一级动力学拟合曲线(d); 铁氰酸钾和硫代硫酸钠的紫外-可见光图谱(e);CoFe2O4@PDA@Pt复合材料催化铁氰酸钾的降解曲线(f)
Figure 7. UV-vis spectra of p-nitrophenol and p-nitrophenol sodium (a); UV-vis spectra without catalyst p-nitrophenol (b); Degradation curves of p-nitrophenol catalyzed by CoFe2O4@PDA@Pt composite (c); Quasi-first-order kinetics fit curves of reduction of 4-NP by NaBH4 (d); UV-vis spectra of potassium ferricyanate and sodium thiosulfate (e); Degradation of potassium ferricyanate catalyzed by CoFe2O4@PDA@Pt composite (f)
4-NP—p-Nitrophenol
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