title: Mechanism and experimental study on the photocatalytic performance of Ag/AgCl @ chiral TiO2 nanofibers photocatalyst: the impact of wastewater components.
abstract: The effect of the water matrix components of a secondary effluent of a urban wastewater treatment plant on the photocatalytic activity of Ag/AgCl @ chiral TiO2 nanofibers and the undergoing reaction mechanisms were investigated. These effects were evaluated through the water components-induced changes on the net rate of hydroxyl radical (˙OH) generation and modeled using a relative rate technique. Dissolved organic matter DOM (k=-2.8×10(8) M(-1) s(-1)) scavenged reactive oxygen species, Cl(-) (k=-5.3×10(8) M(-1) s(-1)) accelerated the transformation from Ag to AgCl (which is not photocatalytically active under visible-light irradiation), while Ca(2+) at concentrations higher than 50 mM (k=-1.3×10(9) M(-1) s(-1)) induced aggregation of Ag/AgCl and thus all of them revealed inhibitory effects. In contrast, NO3(-) (k=6.9×10(8) M(-1) s(-1)) and CO3(2-) (k=3.7×10(8) M(-1) s(-1)) improved the photocatalytic activity of Ag/AgCl slightly by improving the rate of HO˙ generation. Other ubiquitous secondary effluent components including SO4(2-) (k=3.9×10(5) M(-1) s(-1)), NH3(+) (k=3.5×10(5) M(-1) s(-1)) and Na(+) (k=2.6×10(4) M(-1) s(-1)) had negligible effects. 90% of 17-α-ethynylestradiol (EE2) spiked in the secondary effluent was removed within 12 min, while the structure and size of Ag/AgCl @ chiral TiO2 nanofibers remained stable. This work may be helpful not only to uncover the photocatalytic mechanism of Ag/AgCl based photocatalyst but also to elucidate the transformation and transportation of Ag and AgCl in natural water.
authors.affiliation: Key Laboratory of Integrated Regulation and Resource Development of Shallow Lakes, Ministry of Education, College of Environment, Hohai University. Xi Kang Road #1, Nanjing 210098, PR China.
authors.forename: Dawei
authors.initials: D
authors.lastname: Wang
authors.affiliation: Key Laboratory of Integrated Regulation and Resource Development of Shallow Lakes, Ministry of Education, College of Environment, Hohai University. Xi Kang Road #1, Nanjing 210098, PR China. Electronic address: envly@hhu.edu.cn.
authors.forename: Yi
authors.initials: Y
authors.lastname: Li
authors.affiliation: Environmental Nanocatalysis & Photoreaction Engineering, Department of Chemical Engineering, Loughborough University, Loughborough LE11 3TU, United Kingdom.
authors.forename: Gianluca
authors.initials: G
authors.lastname: Li Puma
authors.affiliation: Key Laboratory of Integrated Regulation and Resource Development of Shallow Lakes, Ministry of Education, College of Environment, Hohai University. Xi Kang Road #1, Nanjing 210098, PR China.
authors.forename: Chao
authors.initials: C
authors.lastname: Wang
authors.affiliation: Key Laboratory of Integrated Regulation and Resource Development of Shallow Lakes, Ministry of Education, College of Environment, Hohai University. Xi Kang Road #1, Nanjing 210098, PR China.
authors.forename: Peifang
authors.initials: P
authors.lastname: Wang
authors.affiliation: Key Laboratory of Integrated Regulation and Resource Development of Shallow Lakes, Ministry of Education, College of Environment, Hohai University. Xi Kang Road #1, Nanjing 210098, PR China.
authors.forename: Wenlong
authors.initials: W
authors.lastname: Zhang
authors.affiliation: Key Laboratory of Integrated Regulation and Resource Development of Shallow Lakes, Ministry of Education, College of Environment, Hohai University. Xi Kang Road #1, Nanjing 210098, PR China.
authors.forename: Qing
authors.initials: Q
authors.lastname: Wang
mesh_terms: D001578:Benzopyrans / Q000737:chemistry; D002118:Calcium / Q000737:chemistry; D002254:Carbonates / Q000737:chemistry; D002384:Catalysis; D002712:Chlorides / Q000737:chemistry; D004997:Ethinyl Estradiol / Q000737:chemistry; D008027:Light; D053768:Metal Nanoparticles / Q000737:chemistry / Q000528:radiation effects; D057139:Nanofibers / Q000737:chemistry / Q000528:radiation effects; D009566:Nitrates / Q000737:chemistry; D010782:Photolysis; D017382:Reactive Oxygen Species; D012834:Silver / Q000737:chemistry / Q000528:radiation effects; D018030:Silver Compounds / Q000737:chemistry / Q000528:radiation effects; D014025:Titanium / Q000737:chemistry / Q000528:radiation effects; D014865:Waste Disposal, Fluid / Q000379:methods; D062065:Wastewater; D014874:Water Pollutants, Chemical / Q000737:chemistry*
chemical_list: D001578:Benzopyrans; D002118:Calcium; D002254:Carbonates; D002712:Chlorides; D004997:Ethinyl Estradiol; D009566:Nitrates; D017382:Reactive Oxygen Species; D012834:Silver; D018030:Silver Compounds; D014025:Titanium; D062065:Wastewater; D014874:Water Pollutants, Chemical; C009495:titanium dioxide; C037548:silver chloride; C005023:fulvic acid
keywords: Ag; AgCl; Photocatalytic performance; Transformation; Wastewater components