title: [New-type electrodeless excilamp for advanced treatment on nitrogen-heterocyclic compounds (NHCs) in aqueous solution].
abstract: A novel 206 nm excilamp generated by microwave-driven Kr/I2 mixtures was employed for nitrogen-heterocyclic compounds (NHCs) degradation in aqueous solution. The photodissociation efficiencies of indole and quinoline with 206 nm excilamp were estimated on the basis of removal efficiency of targeted compounds and the loss of total organic carbon (TOC). The results indicated that removal efficiency of 20 mg x L(-1) indole was as high as 62.0% after 80 min and TOC loss efficiency of 50.7% for 150 min. The irradiation time, initial concentration and pH value had some influences on quinoline degradation. Indole removal efficiency and TOC loss was markedly higher than that of quinoline under the same condition. The intermediates were identified qualitatively by gas chromatography/mass spectrum (GC/MS) with headspace sampling after they were extracted by rotary evaporator. GC/MS analysis indicated that indole and quinoline underwent ring-open dissociation under 206 nm irradiation, as a result, benzene, xylene, acetate, aldehyde, as well as ester compounds were formed, while indole aggregation reaction occurred during indole photodegradation. At last, degradation mechanisms of quinoline and indole in aqueous media with 206 nm excilamp were proposed on the basis of intermediates.
authors.affiliation: Department of Environmental Engineering, Jiangsu Teachers University of Technology, Changzhou 213001, China. bess_ye@jstu.edu.cn
authors.forename: Zhao-Lian
authors.initials: ZL
authors.lastname: Ye
authors.forename: Bin
authors.initials: B
authors.lastname: Wang
authors.forename: Juan-Juan
authors.initials: JJ
authors.lastname: Lu
authors.forename: Feng
authors.initials: F
authors.lastname: Li
authors.forename: Ren-Xi
authors.initials: RX
authors.lastname: Zhang
mesh_terms: D055664:Electrochemical Techniques / Q000379:methods*; D004566:Electrodes; D006571:Heterocyclic Compounds / Q000737:chemistry / Q000302:isolation & purification* / Q000528:radiation effects; D007211:Indoles / Q000737:chemistry / Q000302:isolation & purification; D009584:Nitrogen / Q000737:chemistry*; D010782:Photolysis / Q000528:radiation effects; D011804:Quinolines / Q000737:chemistry / Q000302:isolation & purification; D014466:Ultraviolet Rays; D014865:Waste Disposal, Fluid / Q000379:methods; D062065:Wastewater / Q000737:chemistry*
chemical_list: D006571:Heterocyclic Compounds; D007211:Indoles; D009584:Nitrogen; D011804:Quinolines; D062065:Wastewater; C030374:indole