title: Catalytic degradation of recalcitrant pollutants by Fenton-like process using polyacrylonitrile-supported iron (II) phthalocyanine nanofibers: Intermediates and pathway.
abstract: Iron (II) phthalocyanine (FePc) molecules were isolated in polyacrylonitrile (PAN) nanofibers by electrospinning to prevent the formation of dimers and oligomers. Carbamazepine (CBZ) and Rhodamine B (RhB) degradation was investigated during a Fenton-like process with FePc/PAN nanofibers. Classical quenching tests with isopropanol and electron paramagnetic resonance tests with 5,5-dimethyl-pyrroline-oxide as spin-trapping agent were performed to determine the formation of active species during hydrogen peroxide (H2O2) decomposition by FePc/PAN nanofibers. After eight recycles for CBZ degradation over the FePc/PAN nanofibers/H2O2 system, the removal ratios of CBZ remained at 99%. Seven by-products of RhB and twelve intermediates of CBZ were identified using ultra-performance liquid chromatography and high-resolution mass spectrometry. Pathways of CBZ and RhB degradation were proposed based on the identified intermediates. As the reaction proceeded, all CBZ and RhB aromatic nucleus intermediates decreased and were transformed to small acids, but also to potentially toxic epoxide-containing intermediates and acridine, because of the powerful oxidation ability of •OH in the catalytic system.
authors.affiliation: National Engineering Lab for Textile Fiber Materials & Processing Technology (Zhejiang), Zhejiang Sci-Tech University, Hangzhou, 310018, China.
authors.forename: Zhexin
authors.initials: Z
authors.lastname: Zhu
authors.affiliation: National Engineering Lab for Textile Fiber Materials & Processing Technology (Zhejiang), Zhejiang Sci-Tech University, Hangzhou, 310018, China.
authors.forename: Yi
authors.initials: Y
authors.lastname: Chen
authors.affiliation: National Engineering Lab for Textile Fiber Materials & Processing Technology (Zhejiang), Zhejiang Sci-Tech University, Hangzhou, 310018, China.
authors.forename: Yan
authors.initials: Y
authors.lastname: Gu
authors.affiliation: National Engineering Lab for Textile Fiber Materials & Processing Technology (Zhejiang), Zhejiang Sci-Tech University, Hangzhou, 310018, China.
authors.forename: Fei
authors.initials: F
authors.lastname: Wu
authors.affiliation: National Engineering Lab for Textile Fiber Materials & Processing Technology (Zhejiang), Zhejiang Sci-Tech University, Hangzhou, 310018, China. Electronic address: luwy@zstu.edu.cn.
authors.forename: Wangyang
authors.initials: W
authors.lastname: Lu
authors.affiliation: National Engineering Lab for Textile Fiber Materials & Processing Technology (Zhejiang), Zhejiang Sci-Tech University, Hangzhou, 310018, China.
authors.forename: Tiefeng
authors.initials: T
authors.lastname: Xu
authors.affiliation: National Engineering Lab for Textile Fiber Materials & Processing Technology (Zhejiang), Zhejiang Sci-Tech University, Hangzhou, 310018, China. Electronic address: wxchen@zstu.edu.cn.
authors.forename: Wenxing
authors.initials: W
authors.lastname: Chen
mesh_terms: D000180:Acrylic Resins / Q000737:chemistry*; D002220:Carbamazepine / Q000737:chemistry / Q000302:isolation & purification; D002384:Catalysis; D002851:Chromatography, High Pressure Liquid; D006861:Hydrogen Peroxide / Q000737:chemistry*; D007211:Indoles / Q000737:chemistry*; D007501:Iron / Q000737:chemistry*; D054833:Isoindoles; D013058:Mass Spectrometry / Q000379:methods; D008956:Models, Chemical; D015394:Molecular Structure; D057139:Nanofibers / Q000737:chemistry*; D010084:Oxidation-Reduction; D012235:Rhodamines / Q000737:chemistry; D017550:Spectroscopy, Fourier Transform Infrared; D014865:Waste Disposal, Fluid / Q000379:methods; D062065:Wastewater / Q000737:chemistry; D014874:Water Pollutants, Chemical / Q000737:chemistry* / Q000302:isolation & purification; D014961:X-Ray Diffraction
chemical_list: D000180:Acrylic Resins; D002220:Carbamazepine; D006861:Hydrogen Peroxide; D007211:Indoles; D007501:Iron; D054833:Isoindoles; D012235:Rhodamines; D062065:Wastewater; D014874:Water Pollutants, Chemical; C045076:Fenton's reagent; C010504:polyacrylonitrile; C029773:rhodamine B; C013647:phthalocyanine
keywords: Degradation pathways; Hydroxyl radicals; Iron (II) phthalocyanine; Polyacrylonitrile nanofibers; Recalcitrant pollutants; Transformation products