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Degradation kinetics of isoproturon and its subsequent products in contact with TiO2 functionalized silica nanofibers

Eva Loccufier (UGent) , Koen Deventer (UGent) , Dave Manhaeghe (UGent) , Stijn Van Hulle (UGent) , Dagmar D'hooge (UGent) , Klaartje De Buysser (UGent) and Karen De Clerck (UGent)
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Abstract
A challenge for the photodegradation of (organic) micro-pollutants in waste water treatment is the mechanistic and kinetic understanding beyond the degradation of the initial (parent) harmful product, e.g. the phenylurea herbicide isoproturon (IPU). By combining liquid chromatography-mass spectrometry and kinetic Monte Carlo modeling, we demonstrate that upon optimizing the dip-coating conditions (0.34 mol L (-1) TiO2 solution at a coating speed of 160 mm min( -1)) for the functionalization of a superhydrophilic electrospun silica nanofibrous membrane (i) hydroxylation is a dominant reaction pathway and (ii) once IPU reacts on the surface of the TiO(2 )nanoparticles, further hydroxylation occurs sufficiently fast, with complete IPU removal under the detection limit (5-10 mg Lsolution(-1)) as a result of UV irradiation within 8 h. As hydroxylation is dominant, degradation intermediates with a higher water solubility are formed and therefore a decreased toxicity is obtained upon reintroducing the treated solution into the environment. This is confirmed by respirometry, with an increase in the oxygen uptake rate of an activated sludge from 5.9 mg O(2 )g(activated) ( -1)(sludge) h (-1 )for an untreated 10 mg L-1 IPU solution to 8.2 mg O-2 g(activated sludge) (-1) h( -1) for a solution irradiated for 8 h, in line with a blank solution.
Keywords
Photodegradation kinetics, Water treatment, Electrospinning, Kinetic Monte Carlo modeling, Respirometry, Hydroxylation, ADVANCED OXIDATION PROCESSES, HETEROGENEOUS PHOTOCATALYTIC DEGRADATION, WASTE-WATER TREATMENT, HERBICIDE ISOPROTURON, ELECTROSPUN NANOFIBERS, INTERMEDIATE PRODUCTS, LIQUID-CHROMATOGRAPHY, AQUEOUS-SOLUTION, SUPPORTED TIO2, AZO DYES

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MLA
Loccufier, Eva, et al. “Degradation Kinetics of Isoproturon and Its Subsequent Products in Contact with TiO2 Functionalized Silica Nanofibers.” CHEMICAL ENGINEERING JOURNAL, vol. 387, 2020, doi:10.1016/j.cej.2020.124143.
APA
Loccufier, E., Deventer, K., Manhaeghe, D., Van Hulle, S., D’hooge, D., De Buysser, K., & De Clerck, K. (2020). Degradation kinetics of isoproturon and its subsequent products in contact with TiO2 functionalized silica nanofibers. CHEMICAL ENGINEERING JOURNAL, 387. https://doi.org/10.1016/j.cej.2020.124143
Chicago author-date
Loccufier, Eva, Koen Deventer, Dave Manhaeghe, Stijn Van Hulle, Dagmar D’hooge, Klaartje De Buysser, and Karen De Clerck. 2020. “Degradation Kinetics of Isoproturon and Its Subsequent Products in Contact with TiO2 Functionalized Silica Nanofibers.” CHEMICAL ENGINEERING JOURNAL 387. https://doi.org/10.1016/j.cej.2020.124143.
Chicago author-date (all authors)
Loccufier, Eva, Koen Deventer, Dave Manhaeghe, Stijn Van Hulle, Dagmar D’hooge, Klaartje De Buysser, and Karen De Clerck. 2020. “Degradation Kinetics of Isoproturon and Its Subsequent Products in Contact with TiO2 Functionalized Silica Nanofibers.” CHEMICAL ENGINEERING JOURNAL 387. doi:10.1016/j.cej.2020.124143.
Vancouver
1.
Loccufier E, Deventer K, Manhaeghe D, Van Hulle S, D’hooge D, De Buysser K, et al. Degradation kinetics of isoproturon and its subsequent products in contact with TiO2 functionalized silica nanofibers. CHEMICAL ENGINEERING JOURNAL. 2020;387.
IEEE
[1]
E. Loccufier et al., “Degradation kinetics of isoproturon and its subsequent products in contact with TiO2 functionalized silica nanofibers,” CHEMICAL ENGINEERING JOURNAL, vol. 387, 2020.
@article{8644208,
  abstract     = {A challenge for the photodegradation of (organic) micro-pollutants in waste water treatment is the mechanistic and kinetic understanding beyond the degradation of the initial (parent) harmful product, e.g. the phenylurea herbicide isoproturon (IPU). By combining liquid chromatography-mass spectrometry and kinetic Monte Carlo modeling, we demonstrate that upon optimizing the dip-coating conditions (0.34 mol L (-1) TiO2 solution at a coating speed of 160 mm min( -1)) for the functionalization of a superhydrophilic electrospun silica nanofibrous membrane (i) hydroxylation is a dominant reaction pathway and (ii) once IPU reacts on the surface of the TiO(2 )nanoparticles, further hydroxylation occurs sufficiently fast, with complete IPU removal under the detection limit (5-10 mg Lsolution(-1)) as a result of UV irradiation within 8 h. As hydroxylation is dominant, degradation intermediates with a higher water solubility are formed and therefore a decreased toxicity is obtained upon reintroducing the treated solution into the environment. This is confirmed by respirometry, with an increase in the oxygen uptake rate of an activated sludge from 5.9 mg O(2 )g(activated) ( -1)(sludge) h (-1 )for an untreated 10 mg L-1 IPU solution to 8.2 mg O-2 g(activated sludge) (-1) h( -1) for a solution irradiated for 8 h, in line with a blank solution.},
  articleno    = {124143},
  author       = {Loccufier, Eva and Deventer, Koen and Manhaeghe, Dave and Van Hulle, Stijn and D'hooge, Dagmar and De Buysser, Klaartje and De Clerck, Karen},
  issn         = {1385-8947},
  journal      = {CHEMICAL ENGINEERING JOURNAL},
  keywords     = {Photodegradation kinetics,Water treatment,Electrospinning,Kinetic Monte Carlo modeling,Respirometry,Hydroxylation,ADVANCED OXIDATION PROCESSES,HETEROGENEOUS PHOTOCATALYTIC DEGRADATION,WASTE-WATER TREATMENT,HERBICIDE ISOPROTURON,ELECTROSPUN NANOFIBERS,INTERMEDIATE PRODUCTS,LIQUID-CHROMATOGRAPHY,AQUEOUS-SOLUTION,SUPPORTED TIO2,AZO DYES},
  language     = {eng},
  pages        = {14},
  title        = {Degradation kinetics of isoproturon and its subsequent products in contact with TiO2 functionalized silica nanofibers},
  url          = {http://dx.doi.org/10.1016/j.cej.2020.124143},
  volume       = {387},
  year         = {2020},
}

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