TY - JOUR
T1 - Oxidation and molecular properties of microcystin-LR, microcystin-RR and anatoxin-a using UV-light-emitting diodes at 255 nm in combination with H2O2
AU - Park, Jeong Ann
AU - Yang, Boram
AU - Jang, Mi
AU - Kim, Jae Hyun
AU - Kim, Song Bae
AU - Park, Hee Deung
AU - Park, Hyun Mee
AU - Lee, Sang Hyup
AU - Choi, Jae Woo
N1 - Funding Information:
This research is supported by the Korea Ministry of Environment (MOE) as a Public Technology Program based on Environmental Policy ( E416-00020-0606-0 ). Thanks to Western Seoul Center , Korea Basic Science Institute for supporting EPR analysis. Appendix A
Funding Information:
This research is supported by the Korea Ministry of Environment (MOE) as a Public Technology Program based on Environmental Policy (E416-00020-0606-0). Thanks to Western Seoul Center, Korea Basic Science Institute for supporting EPR analysis.
PY - 2019/6/15
Y1 - 2019/6/15
N2 - On the use of UV light emitting diodes (UV-LEDs), emitting at 260–290 nm, has attracted attention for treating cyanotoxins, although most previous studies related with UV/H2O2 process have been used conventional mercury UV lamp (λ = 254 nm). Therefore, the aim of the study was to investigate the UV-LEDs, having a wavelength of 255 nm, coupled with H2O2 process for the removal of microcystin-LR (MC-LR), microcystin-RR (MC-RR), and anatoxin-a (ANTX) and to verify the degradation kinetics, mechanism and impact of water quality parameters in relation to their molecular properties. Among three UV-LEDs (λ = 255, 266, and 280 nm), the shortest one was the most effective to remove MC-LR coincided with its decadic molar absorption coefficient. The degradation rate constants of MC-LR, MC-RR, and ANTX were 0.0644, 0.0241, and 0.0076 cm2 mJ−1, respectively, during the UV-LED/H2O2 process. For MC-LR and MC-RR degradation, reaction with [rad]OH is a major mechanism along with direct photolysis as a minor factor. ANTX degradation is predominantly attributed to [rad]OH. The second-order rate constant for ANTX is one order of magnitude lower than others because ANTX is recalcitrant to oxidation. The MC-LR degradation occurred at the diene and aromatic ring of Adda, Mdha, and amide bond and the main reactive oxidation site of MC-RR was the Adda chain. In contrast, photo-oxidation transformed ANTX to higher molecular weight compounds via polymerization instead of degradation. When MC-LR, MC-RR, and ANTX were co-present, lower concentration of dissolved organic carbon and higher acidity with bicarbonate was favorable to remove MC-LR and MC-RR according to their scavenging factors and reaction with CO[rad]−3. However, ANTX is relatively resistant to degradation at pH 3.2.
AB - On the use of UV light emitting diodes (UV-LEDs), emitting at 260–290 nm, has attracted attention for treating cyanotoxins, although most previous studies related with UV/H2O2 process have been used conventional mercury UV lamp (λ = 254 nm). Therefore, the aim of the study was to investigate the UV-LEDs, having a wavelength of 255 nm, coupled with H2O2 process for the removal of microcystin-LR (MC-LR), microcystin-RR (MC-RR), and anatoxin-a (ANTX) and to verify the degradation kinetics, mechanism and impact of water quality parameters in relation to their molecular properties. Among three UV-LEDs (λ = 255, 266, and 280 nm), the shortest one was the most effective to remove MC-LR coincided with its decadic molar absorption coefficient. The degradation rate constants of MC-LR, MC-RR, and ANTX were 0.0644, 0.0241, and 0.0076 cm2 mJ−1, respectively, during the UV-LED/H2O2 process. For MC-LR and MC-RR degradation, reaction with [rad]OH is a major mechanism along with direct photolysis as a minor factor. ANTX degradation is predominantly attributed to [rad]OH. The second-order rate constant for ANTX is one order of magnitude lower than others because ANTX is recalcitrant to oxidation. The MC-LR degradation occurred at the diene and aromatic ring of Adda, Mdha, and amide bond and the main reactive oxidation site of MC-RR was the Adda chain. In contrast, photo-oxidation transformed ANTX to higher molecular weight compounds via polymerization instead of degradation. When MC-LR, MC-RR, and ANTX were co-present, lower concentration of dissolved organic carbon and higher acidity with bicarbonate was favorable to remove MC-LR and MC-RR according to their scavenging factors and reaction with CO[rad]−3. However, ANTX is relatively resistant to degradation at pH 3.2.
KW - Cyanotoxins
KW - Hydrogen peroxides
KW - Molecular property
KW - Transformation products
KW - UV-LED
KW - Water quality parameters
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U2 - 10.1016/j.cej.2019.02.101
DO - 10.1016/j.cej.2019.02.101
M3 - Article
AN - SCOPUS:85061656239
VL - 366
SP - 423
EP - 432
JO - Chemical Engineering Journal
JF - Chemical Engineering Journal
SN - 1385-8947
ER -