DOI: 10.1016/j.watres.2017.12.065
Scopus记录号: 2-s2.0-85040321331
论文题名: Transformation products formation of ciprofloxacin in UVA/LED and UVA/LED/TiO2 systems: Impact of natural organic matter characteristics
作者: Li S. ; Hu J.
刊名: Water Research
ISSN: 431354
出版年: 2018
卷: 132 起始页码: 320
结束页码: 330
语种: 英语
英文关键词: Ciprofloxacin
; Natural organic matter characteristics
; Transformation products formation
; UVA/LED
; UVA/LED/TiO2
Scopus关键词: Antibiotics
; Biogeochemistry
; Catalysis
; Light sources
; Mineralogy
; Organic acids
; Organic compounds
; Photocatalysis
; Photolysis
; Quenching
; Ciprofloxacin
; Natural organic matters
; Transformation products
; UVA/LED
; UVA/LED/TiO2
; Biological materials
; carbon
; ciprofloxacin
; humic acid
; natural organic matter
; piperazine
; radical
; antibiotics
; chemical reaction
; decomposition
; electrode
; humic acid
; mineralization
; organic matter
; oxide
; pollutant removal
; reaction kinetics
; titanium
; transformation
; ultraviolet radiation
; aptitude
; Article
; dealkylation
; decomposition
; defluorination
; hydroxylation
; mineralization
; oxidation
; photocatalysis
; photolysis
; priority journal
; ultraviolet A radiation
; university
; Suwannee River
; United States
英文摘要: The role of natural organic matter (NOM) in contaminants removal by photolysis and photocatalysis has aroused increasing interest. However, evaluation of the influence of NOM characteristics on the transformation products (TPs) formation and transformation pathways of contaminants has rarely been performed. This study investigated the decomposition kinetics, mineralization, TPs formation and transformation pathways of antibiotic ciprofloxacin (CIP) during photolysis and photocatalysis in the presence of three commercial NOM isolates (Sigma-Aldrich humic acid (SAHA), Suwannee River humic acid (SRHA) and Suwannee River NOM (SRNOM)) by using UVA light emitting diode (UVA/LED) as an alternative light source. NOM isolates insignificantly affected CIP photolysis but strongly inhibited CIP photocatalysis due to competitive radical quenching. The inhibitory effect followed the order of SAHA (49.6%) > SRHA (29.9%) > SRNOM (21.2%), consistent with their •OH quenching abilities, SUVA254 values and orders of aromaticity. Mineralization rates as revealed by F− release were negatively affected by NOM during CIP photocatalysis. TPs arising from hydroxylation and defluorination were generally suppressed by NOM isolates in UVA/LED and UVA/LED/TiO2 systems. In contrast, dealkylation and oxidation of piperazine ring were promoted by NOM. The enhancement in the apparent formation kinetics (kapp) of TP245, TP291, TP334a, TP334b and TP362 followed the order of SRNOM > SRHA > SAHA. kapp values were positively correlated with O/C ratio, carboxyl content, E2/E3 and fluorescence index (FI) of NOM and negatively related with SUVA254 values. The observed correlations indicate that NOM properties are important in determining the fate and transformation of organic contaminants during photolysis and photocatalysis. © 2018 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/112976
Appears in Collections: 气候减缓与适应
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作者单位: Department of Civil & Environmental Engineering, National University of Singapore, 1 Engineering Drive 2, Singapore, 117576, Singapore
Recommended Citation:
Li S.,Hu J.. Transformation products formation of ciprofloxacin in UVA/LED and UVA/LED/TiO2 systems: Impact of natural organic matter characteristics[J]. Water Research,2018-01-01,132