Abstract:In this study, a Ti/IrO2-Ta2O5 anode was prepared by a hydrothermal method, and the prepared electrode was characterized by techniques such as scanning electron microscopy, X-ray diffraction, and electron dispersive spectroscopy. At the same time, the anode characteristics before and after electrochemical experiments were analyzed. The electrode gradation mechanism of oxytetracycline is discussed. In the whole experimental process, the range of electrolysis conditions was determined by single factor experiment… Show more
“…With the increase of the number of cycles, the peaks near 275 and 353 nm gradually weakened. It was speculated that some functional groups were destroyed due to the action of • OH . After 60 s, the well-defined absorption band basically disappeared, which confirmed that the OTC was almost entirely decomposed.…”
Section: Resultsmentioning
confidence: 93%
“…It was speculated that some functional groups were destroyed due to the action of • OH. 2 After 60 s, the well-defined absorption band basically disappeared, which confirmed that the OTC was almost entirely decomposed. Under the same residence time (60 s), compared with the single degradation experiment (Figure 2), the photocatalytic degradation and reaction rate of the circulation experiment (Figure 3a) were significantly improved.…”
Section: Introductionmentioning
confidence: 86%
“…Oxytetracycline (OTC), as one of the tetracycline antibiotics, is widely used in aquaculture and the treatment of human and veterinary diseases due to its good anti-infection and promotion of animal growth. , However, OTC can be discharged into water bodies through various channels and is difficult to be decomposed, which will cause human health problems and ecosystem damage. − Therefore, it is very important to study the degradation of OTC in water bodies. At present, the methods for removing antibiotics from water bodies include activated carbon adsorption, membrane filtration, photolysis, ozonation, Fenton, and photocatalysis technology .…”
In
this work, a spiral microchannel reactor was used to study the
photocatalytic degradation process of oxytetracycline (OTC) in a titanium
dioxide (TiO2) slurry system. The influence of parameters
such as residence time, TiO2 dosage, OTC concentration,
light intensity, and concentration of added ions (NO3
–, SO4
2–, Ca2+, Fe3+) on OTC removal was systematically investigated,
and the degradation stability of OTC in the microreactor was evaluated.
The results show that under the best experimental conditions, the
degradation rate of OTC can reach 99.33%, the initial stage apparent
reaction rate constant is 7.7124 min–1, and the
space–time yield is 142.79 m3 pollutants/(m3 reactor day). In addition, the results prove the high efficiency
and stability of OTC degradation in the microreactor. OTC can be efficiently
degraded under high TiO2 dosage, high initial OTC concentration,
and low light intensity, which demonstrates the outstanding advantages
of spiral microchannels for OTC degradation in slurry systems. This
study has a guiding significance for the efficient photocatalytic
degradation of tetracycline antibiotics in slurry systems.
“…With the increase of the number of cycles, the peaks near 275 and 353 nm gradually weakened. It was speculated that some functional groups were destroyed due to the action of • OH . After 60 s, the well-defined absorption band basically disappeared, which confirmed that the OTC was almost entirely decomposed.…”
Section: Resultsmentioning
confidence: 93%
“…It was speculated that some functional groups were destroyed due to the action of • OH. 2 After 60 s, the well-defined absorption band basically disappeared, which confirmed that the OTC was almost entirely decomposed. Under the same residence time (60 s), compared with the single degradation experiment (Figure 2), the photocatalytic degradation and reaction rate of the circulation experiment (Figure 3a) were significantly improved.…”
Section: Introductionmentioning
confidence: 86%
“…Oxytetracycline (OTC), as one of the tetracycline antibiotics, is widely used in aquaculture and the treatment of human and veterinary diseases due to its good anti-infection and promotion of animal growth. , However, OTC can be discharged into water bodies through various channels and is difficult to be decomposed, which will cause human health problems and ecosystem damage. − Therefore, it is very important to study the degradation of OTC in water bodies. At present, the methods for removing antibiotics from water bodies include activated carbon adsorption, membrane filtration, photolysis, ozonation, Fenton, and photocatalysis technology .…”
In
this work, a spiral microchannel reactor was used to study the
photocatalytic degradation process of oxytetracycline (OTC) in a titanium
dioxide (TiO2) slurry system. The influence of parameters
such as residence time, TiO2 dosage, OTC concentration,
light intensity, and concentration of added ions (NO3
–, SO4
2–, Ca2+, Fe3+) on OTC removal was systematically investigated,
and the degradation stability of OTC in the microreactor was evaluated.
The results show that under the best experimental conditions, the
degradation rate of OTC can reach 99.33%, the initial stage apparent
reaction rate constant is 7.7124 min–1, and the
space–time yield is 142.79 m3 pollutants/(m3 reactor day). In addition, the results prove the high efficiency
and stability of OTC degradation in the microreactor. OTC can be efficiently
degraded under high TiO2 dosage, high initial OTC concentration,
and low light intensity, which demonstrates the outstanding advantages
of spiral microchannels for OTC degradation in slurry systems. This
study has a guiding significance for the efficient photocatalytic
degradation of tetracycline antibiotics in slurry systems.
“…Compared to the theoretical value of 59.2 mV pH −1 at 25 °C, the slope value of 62.8 mV pH-1 is very similar, which suggests that the OTC oxidation reaction involved a ratio of 1 electrons to protons. The possible mechanism for the electrochemical reactions at the electrode surface is shown in Scheme 1 [ 46 , 47 ]. Scheme 1 Mechanism of detection of oxytetracycline.…”
“… Processes Method Efficiency Refs. Cu-SACs/peroxymonosulfate Peroxymonosulfate, catalyst dose, and initial pH were investigated 96.47% at 60 min 58 plasma-catalytic/graphene-TiO 2 -Fe 3 O 4 nanocomposites catalyst dosage, peak voltage, air flow rate and pH value were investigated 98.1% 59 Electrochemical/Ti/IrO 2 -Ta 2 O 5 anode Electrical current, plate spacing, electrolyte concentration, and solution pH were investigated 99.02% at 20 min 60 Fenton-like rGO in Pd/nZVI/rGO composite rateio, initial concentration of OTC, reaction time, and pH were investigated 96.5% at 60 min 61 UV/peracetic acid pH and a PAA dose were investigated completely removed in 45 min PCO/O 3 pH, reaction time, O 3 concentration, and catalyst dose were investigated at 10 mg/l OTC concentration 96.2% removed at 60 min Current study …”
In this research, we synthesized BiOI/NH2-MIL125(Ti) via solvo-thermal method to investigation of oxytetracycline (OTC) degradation in photocatalytic-ozonation process. The results of the XRD, FESEM, EDAX, FTIR, UV–Vis, TEM, XPS, and BET analyzes indicated that the catalyst BiOI/MOF was synthesized with excellent quality. Design of experiment (DOE), ANOVA statistical analysis, interaction of parameters and predicated optimum condition was done based on CCD. The effect of catalyst dose (0.25–0.5 mg/l), pH (4–8), reaction time (30–60 min) and O3 concentration (20–40 mN) at 10 mg/l of OTC on PCO/O3 process was optimized. Based on P-value and F-value coefficients (0.0001, 450.3 respectively) the model of OTC (F-value = 2451.04) and (P-value = 0.0001) coefficients, the model of COD removal was quadratic model. Under optimum condition pH 8.0, CD = 0.34 mg/l, RT = 56 min and O3 concentration = 28.7 mN, 96.2 and 77.2% of OTC and COD removed, respectively. The reduction of TOC was 64.2% in optimal conditions, which is less than the reduction of COD and OTC. The kinetics of reaction followed pseudo-first-order kinetic (R2 = 0.99). Synergistic effect coefficient was 1.31 that indicated ozonation, presence of catalyst and photolysis had a synergistic effect on OTC removal. The stability and reusability of the catalyst in six consecutive operating steps was acceptable and 7% efficiency decreased only. Cations (Mg2+, and Ca2+), SO42− had no influence on performing the process, but other anions, organic scavengers, and nitrogen gas, had an inhibitory effect. Finally, the OTC degradation probably pathway includes direct and indirect oxidation that decarboxylation, hydroxylation, demethylation and were the main mechanism in OTC degradation.
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