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Stabilization of nano zero-valent iron by electrospun composite mat with good catalysis and recyclability
Xu, Yan; Guo, Qi; Li, Yuan; Qin, Linjun; Zhang, Kegang; Liu, Guorui; Yuan, Chun-Gang
AbstractNano zero-valent iron (Fe-0, nZVI) has been extensively utilized in the treatment of dyed wastewater. However, the dispersibility, stability and reusability of nZVI need to be improved for both efficiency and environmental safety. One nZVI modified nanofiber composite membrane was successfully fabricated by electrospinning, and the performances in different catalytic systems were evaluated. The synthesized composite mat was characterized by scanning electron microscopy (SEM) and X-ray diffraction (XRD). The loaded nZVI was verified by the change of fiber diameters and the distribution of iron element with/without loading. The composite membrane possessed good recyclability and dispersion property of nZVI with a mean diameter of 114.46 nm. Three Fenton like oxidation systems (H2O2, Na2S2O8, and NaClO2) were selected and investigated for the degradation of Rhodamine B (RhB) in water using the as-prepared composite as a catalyzer. The degradability relationship of the oxidation systems was NaClO2 > Na2S2O8 > H2O2 with observed rate constants (K-obs) of 0.3155, 0.0547, and 0.014, respectively. 50 mg L-1 RhB was completely degraded by 1.5 mM NaClO2 in 15min, which is the best compared with the other two systems. The major free radical species (center dot OH, SO4 center dot(-) and ClO2 center dot) in the three oxidation systems were identified by electron paramagnetic resonance (EPR) and quenching studies. The degradation capacity could be maintained after five recycles and the leached nZVI from the composite was negligible (< 0.55%). For the degradation process, the contribution of dark adsorption (K-ads = 1.5489 x 10(-3)) was much smaller than that of natural-light-derived photocatalysis (K-photo = 1.5489 x 10(-3)) with the adsorption capacity of 4.32 mg g(-1) and oxidative degradation amounts of 9.46 mg g(-1), 10.90 mg g(-1) and 12.32 mg g(-1) in H2O2, Na2S2O8 and NaClO2 systems, respectively. Our results demonstrated that the synthesized composite membrane demonstrated good catalytic properties with good recyclability and stability, and NaClO2 was the most efficacious system for RhB degradation in water.
Department环境化学与生态毒理学国家重点实验室 ; 环境化学与生态毒理学国家重点实验室
Document Type期刊论文
Corresponding AuthorYuan, Chun-Gang
Affiliation1.North China Elect Power Univ, Dept Environm Sci & Engn, Baoding 071000, Peoples R China
2.North China Elect Power Univ, Wetland Res Ctr Baiyangdian Lake, Baoding 071000, Peoples R China
3.Chinese Acad Sci, Res Ctr Ecoenvironm Sci, State Key Lab Environm Chem & Ecotoxicol, POB 2871, Beijing 100085, Peoples R China
Recommended Citation
GB/T 7714
Xu, Yan,Guo, Qi,Li, Yuan,et al. Stabilization of nano zero-valent iron by electrospun composite mat with good catalysis and recyclability[J]. JOURNAL OF CLEANER PRODUCTION,2022,363(0):132459.
APA Xu, Yan.,Guo, Qi.,Li, Yuan.,Qin, Linjun.,Zhang, Kegang.,...&Yuan, Chun-Gang.(2022).Stabilization of nano zero-valent iron by electrospun composite mat with good catalysis and recyclability.JOURNAL OF CLEANER PRODUCTION,363(0),132459.
MLA Xu, Yan,et al."Stabilization of nano zero-valent iron by electrospun composite mat with good catalysis and recyclability".JOURNAL OF CLEANER PRODUCTION 363.0(2022):132459.
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