Photocatalytic oxidation of roxarsone using riboflavin-derivative as a photosensitizer

Meng, Jizhong; Xu, Fang; Yuan, Shuai; Mu, Yang; Wang, Wei; Hu, Zhenhu

doi:10.1016/j.cej.2018.08.127

Cited by 48 publications

(9 citation statements)

References 39 publications

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“…7a,b). In order to verify the HA degradation by ROS, HA/Tyr 25 hydrogel was washed with sodium azide, which is a 1 O 2 scavenger [26]. At 3 months after sodium azide treatment, the HA/Tyr hydrogel remained stable without a severe degradation.…”

Section: Resultsmentioning

confidence: 99%

Effect of photoinitiator on chain degradation of hyaluronic acid

Hong

Park

2019

Biomater Res

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ObjectivesPhotocrosslinking systems of polymers have been widely studied using UV or visible light irradiation. However, the photodegradation behavior derived from light irradiation was rarely reported, comparing with the photocrosslinking. In this study, the tyramine-modified hyaluronic acid (HA/Tyr) hydrogel was prepared using riboflavin (RF) as a photoinitiator, and the degradation behavior of HA by the reactive oxygen species (ROS) generated in photochemical process was investigated.Materials and methodsThe HA/Tyr conjugate was synthesized by EDC/NHS chemistry to introduce phenol group. Degree of substitution (DS, %) of phenol group to HA molecule was about 25%. The structural change of HA/Tyr was measured by proton nuclear magnetic resonance (1H-NMR) and attenuated total reflectance infrared spectroscopy (ATR-FTIR), and the rheological properties of photocrosslinked HA/Tyr hydrogel were investigated by rheometer.ResultsThe HA/Tyr solution with 25% substitution formed a stable hydrogel via visible light irradiation in the presence of RF photoinitiator. Rheological data of HA/Tyr solution showed that the storage modulus (G’) was increased with increasing HA concentration. Additionally, it was found that RF initiated by visible light irradiation induced the degradation of HA molecular chain, and consequently reduced the viscosity of HA/Tyr solutions.ConclusionThe results indicate that RF-based photoinitiator system caused the degradation of HA molecule by ROS generated in photochemical process as well as the crosslinking of HA/Tyr.

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Section: Resultsmentioning

confidence: 99%

Effect of photoinitiator on chain degradation of hyaluronic acid

Hong

Park

2019

Biomater Res

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“…The As(V) concentration was gradually increased to 2.9 μM, which was higher than that of As(III) (0.9 μM). It was reported that As(III) was generated from ROX degradation and further oxidized to As(V) (Meng et al, 2019;Xie et al, 2016). Those results indicated that ROX in the aquatic environment was oxidized to inorganic arsenics under light irradiation.…”

Section: Feasibility Of Rox Photodegradationmentioning

confidence: 94%

Photodegradation of roxarsone in the aquatic environment: influencing factors, mechanisms, and artificial neural network modeling

Meng

Arong

Yuan

et al. 2021

Environ Sci Pollut Res

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Roxarsone (ROX) is an organoarsenic feed additive, and can be discharged into aquatic environment.ROX can photodegrade into more toxic inorganic arsenics, causing arsenic pollution. However, the photodegradation behavior of ROX in aquatic environment is still unclear. To better understand ROX photodegradation behavior, this study investigated the ROX photodegradation mechanism and in uencing factors, and modeled the photodegradation process. The results showed that ROX in the aquatic environment was degraded to inorganic As(III) and As(V) under light irradiation. The degradation e ciency was enhanced by 25 % with the increase of light intensity from 300 µW/cm 2 to 800 µW/cm 2 via indirect photolysis. The photodegradation was temperature dependence, but was only slightly affected by pH. Nitrate ion (NO 3 − ) had an obvious in uence, but sulfate, carbonate, and chlorate ions had a negligible effect on ROX degradation. Dissolved organic matter (DOM) in the solution inhibited the photodegradation. ROX photodegradation was mainly mediated by reactive oxygen species (in the form of single oxygen 1 O 2 ) generated through ROX self-sensitization under irradiation. Based on the data of factors affecting ROX photodegradation, ROX photodegradation model was built and trained by an arti cial neural network (ANN), and the predicted degradation rate was in good agreement with the real values with a root mean square error of 1.008. This study improved the understanding of ROX photodegradation behavior and provided a basis for controlling the pollution from ROX photodegradation.

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“…In order to identify the active species for BPA degradation, MeOH, tert-butyl alcohol (TBA), and 1,4-diazabicyclo [2.2.2]octane (DABCO) were employed as scavengers for both SO 4 c À and cOH, only cOH, and 1 O 2 , respectively. [18][19][20] Electron paramagnetic resonance (EPR) experiments were performed to record the signals of radicals using 5,5-dimethyl-1-pyrroline Noxide (DMPO) and 2,2,6,6-tetramethyl-4-piperidinol (TEMP) as spin trapping agents on a JEOL JES-FA200 spectrometer.…”

Section: Bpa Removal Experimentsmentioning

confidence: 99%