Dual-functional heterogeneous Fenton catalyst Cu/Ti co-doped Fe3O4@FeOOH for cyanide-containing wastewater treatment: Preparation, performance and mechanism

被引:5
作者
Sun, Fangkuan [1 ]
Lu, Tangzheng [1 ]
Feng, Jiayi [1 ]
Kang, Yong [1 ]
机构
[1] Tianjin Univ, Sch Chem Engn & Technol, Tianjin 300350, Peoples R China
关键词
Heterogeneous Fenton catalyst; Magnetite; Goethite; Cu/Ti co -deposition; Cyanide degradation; ZERO-VALENT IRON; BISPHENOL-A; HYDROGEN-PEROXIDE; DEGRADATION; OXIDATION; OXIDES; MICROSPHERES; OFLOXACIN; MAGNETITE; REMOVAL;
D O I
10.1016/j.envpol.2024.123523
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
The dual -functional heterogeneous Fenton catalyst Cu/Ti co -doped iron -based Fenton catalyst (Cu/Ti -Fe3O4@FeOOH, FCT) were successfully prepared by precipitation oxidation method and characterized by XRD, XPS and XAFS. The prepared Cu/Ti co -doped Fe3O4@FeOOH nanoparticles consisted of goethite nanorods and magnetite rod octahedral particles, with Cu and Ti replacing Fe in the catalyst crystal structure, leading to the formation of the goethite structure. The heterogeneous Fenton catalyst FCT exhibited excellent degradation activity for cyanide in wastewater and showed different reaction mechanisms at varying pH levels. When treating 100 mL of 12 mg L-1 NaCN solution, complete degradation occurred within 40 min at 30 degrees C and pH ranging from 6.5 to 12.5 without external energy. Compared to Fe3O4, FCT shows superior degradation activity for cyanide. The surface Cu(I) facilitated the electron transfer and significantly improved the catalytic activity of the catalyst. Additionally, the magnetic properties of the Ti -doped catalyst samples were greatly enhanced compared to the Cu@FeOOH catalyst doped with Cu, making them favorable for recycling and reuse. FCT maintains 100% degradation of cyanogen after three cycles, indicating its excellent stability. Furthermore, electron spin resonance spectroscopy, free radical quenching experiments and fluorescence probe techniques using terephthalic acid (TA) and benzoic acid (BA) confirmed that the presence of center dot OH and FeIV=O reactive species was responsible for the catalysts exhibiting different mechanisms at different pH conditions. Compared with other heterogeneous Fenton catalysts, FCT exhibits intentional degradation activity for cyanide -containing wastewater under different acid -base conditions, which greatly broadened the pH range of the heterogeneous Fenton reaction.
引用
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页数:9
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