Optimization of TiO2 immobilized – Reduce graphene oxide photocatalyst toward organic compounds in aqueous medium

Viet, Thieu Quang Quoc; Nhu, Tran Huynh; Thinh, Doan Ba; Trinh, Dinh Ngoc; Giang, Nguyễn Thị Hương; Dat, Nguyen Minh; Hải, Nguyễn Duy; Nam, Hoàng Minh; Phong, Mai Thanh; Hieu, Nguyen Huu

doi:10.1016/j.synthmet.2021.116867

Cited by 9 publications

(4 citation statements)

References 35 publications

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“…A, B, and AC, namely, space time, PS concentration, and the interaction between space time and PS/ZVI molar ratio, were the most significant parameters in the process as they had a p-value of less than 0.05. Moreover, the coefficients A 2 and C 2 , namely, space time to space time interaction and PS/ZVI molar ratio to PS/ZVI molar ratio interaction, had positive signs in the regression equation, which suggests that the higher values of the space time and PS/ZVI molar ratio are, the more efficient the process is [54]. The adequate precision of the model was 14.7219.…”

Section: Anovamentioning

confidence: 92%

UV and Zero-Valent Iron (ZVI) Activated Continuous Flow Persulfate Oxidation of Municipal Wastewater

et al. 2022

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Currently, sulfate-radical-based advanced oxidation processes are promising candidates to become viable post-treatment processes for wastewater purification. In this work, a continuous flow UV light/persulfate (PS)/zero-valent iron (ZVI) system has been applied for wastewater treatment for the first time. The influence of certain photo-Fenton-like process parameters, such as space time, PS concentration, and PS to ZVI molar ratio, on the removal of total organic carbon (TOC), was examined using the Box–Behnken design. First, synthetic municipal wastewater was used for the experiments, and the polynomial regression model was constructed utilizing the real data by using the response surface methodology (RSM). The adequacy of the RSM model was assessed by analysis of variance, which showed that the model was reliable and could be applied to improve the process parameters for TOC removal. Moreover, both synthetic and real municipal wastewater were spiked with carbamazepine (CBZ), which is commonly prescribed as an antiepileptic drug, to investigate its fate in the UV/PS/ZVI system. With a space time of 60 min, PS concentration of 60 mM, and PS to ZVI molar ratio of 15, it was possible to remove 71% of TOC and completely remove CBZ from the synthetic municipal wastewater, whereas a 60% TOC removal and complete removal of CBZ were achieved at a space time of 50 min, PS concentration of 50 mM, and PS/ZVI molar ratio of 15 for the real municipal wastewater. This difference in TOC removal could possibly be linked to the complex matrix of the real wastewater and the presence of radical scavenging agents.

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Section: Anovamentioning

confidence: 92%

UV and Zero-Valent Iron (ZVI) Activated Continuous Flow Persulfate Oxidation of Municipal Wastewater

et al. 2022

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“…The concentration of long-lived reactive species was quantified using a UV-vis spectrophotometer (Jinghua, UV1800, China), as previously described in references [24,25]. The degradation products at different treatment times are analyzed by liquid chromatography-mass spectrometry (LC-MS, Agilent, 1290UPLC/Q-TOF6550).…”

Section: Experimental Setup Of Plasma Source and Tetracycline Degrada...mentioning

confidence: 99%

“…Though atmospheric Ar favors the discharge intensity, the hypoxic environment makes ROS generation less efficient. Thus, the production of •OH radical under conditions of Ar discharge occurs solely as a result of the collision of high-energy electrons or metastable Ar atoms with H 2 O molecules [25]. Oxygen, as an electronegative gas, tends to adsorb electrons during pulsed discharges, and therefore the oxygen discharge has the weakest intensity, which is one of the reasons for the lowest degradation efficiency.…”

Section: Catalysts Characterizationmentioning

confidence: 99%

“…Oxygen, as an electronegative gas, tends to adsorb electrons during pulsed discharges, and therefore the oxygen discharge has the weakest intensity, which is one of the reasons for the lowest degradation efficiency. It should be noted that, according to the optical emission spectra, Ar and O 2 discharges emit light within the 600-900 nm wavelength range [25,40,41]. Although g-C 3 N 4 /TiO 2 is capable of absorbing light within this wavelength range, its efficiency is not comparable to that of UV light [42].…”

Section: Catalysts Characterizationmentioning

confidence: 99%

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Enhanced degradation of tetracycline by gas-liquid discharge plasma coupled with g-C₃N₄/TiO₂

WANG 王,

ZHOU 周,

WANG 王

et al. 2024

Plasma Sci. Technol.

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Plasma-catalysis is considered as one of the most promising technologies for antibiotic degradation in water. In the plasma-catalytic system, one of the factors affecting the degradation effect is the performance of the photocatalyst, which is usually restricted by the rapid recombination of electrons and holes as well as narrow light absorption range. In this research, a photocatalyst g-C3N4/TiO2 was prepared and coupled with gas-liquid discharge (GLD) to degrade tetracycline (TC). The performance was examined, and the degradation pathways and mechanisms were studied. Results show that a 90% degradation rate is achieved in the GLD with g-C3N4/TiO2 over a 10 min treatment. Increasing the pulse voltage is conducive to increasing the degradation rate, whereas the addition of excessive g-C3N4/TiO2 tends to precipitate agglomerates, resulting in a poor degradation efficiency. The redox properties of the g-C3N4/TiO2 surface promote the generation of oxidizing active species (H2O2, O3) in solution. Radical quenching experiments showed that ·OH, hole (h+), play important roles in the TC degradation by the discharge with g-C3N4/TiO2. Two potential degradation pathways were proposed based on the intermediates. The toxicity of tetracycline was reduced by treatment in the system. Furthermore, the g-C3N4/TiO2 composites exhibited excellent recoverability and stability.Keywords: Gas-liquid discharge; Plasma-catalysis; g-C3N4/TiO2; TC degradation

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Titania/reduced graphene oxide nanocomposites (TiO2/rGO) as an efficient photocatalyst for the effective degradation of brilliant green in aqueous media: effect of peroxymonosulfate and operational parameters

Khan

Sayed

Gul

2023

Environ Sci Pollut Res

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Optimization of TiO2 immobilized – Reduce graphene oxide photocatalyst toward organic compounds in aqueous medium

Cited by 9 publications

References 35 publications

UV and Zero-Valent Iron (ZVI) Activated Continuous Flow Persulfate Oxidation of Municipal Wastewater

UV and Zero-Valent Iron (ZVI) Activated Continuous Flow Persulfate Oxidation of Municipal Wastewater

Enhanced degradation of tetracycline by gas-liquid discharge plasma coupled with g-C₃N₄/TiO₂

Titania/reduced graphene oxide nanocomposites (TiO2/rGO) as an efficient photocatalyst for the effective degradation of brilliant green in aqueous media: effect of peroxymonosulfate and operational parameters

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Optimization of TiO2 immobilized – Reduce graphene oxide photocatalyst toward organic compounds in aqueous medium

Cited by 9 publications

References 35 publications

UV and Zero-Valent Iron (ZVI) Activated Continuous Flow Persulfate Oxidation of Municipal Wastewater

UV and Zero-Valent Iron (ZVI) Activated Continuous Flow Persulfate Oxidation of Municipal Wastewater

Enhanced degradation of tetracycline by gas-liquid discharge plasma coupled with g-C3N4/TiO2

Titania/reduced graphene oxide nanocomposites (TiO2/rGO) as an efficient photocatalyst for the effective degradation of brilliant green in aqueous media: effect of peroxymonosulfate and operational parameters

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Enhanced degradation of tetracycline by gas-liquid discharge plasma coupled with g-C₃N₄/TiO₂