A novel microwave-assisted impregnation method with water as the dispersion medium to synthesize modified g-C3N4/TiO2 heterojunction photocatalysts

Liu, Yuanyuan; Tian, Jing; Wei, Linyu; Wang, Qing; Wang, Chuan; Yuan, Chun

doi:10.1016/j.optmat.2020.110128

Cited by 30 publications

(3 citation statements)

References 37 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In this case, the substrates incorporated in the suspension will be calcined with enough volume of TiO 2 adsorbed. Alternatively, in the impregnation method, the solvent evaporation stage can be made with microwave assistance, since can result in a more efficient junction between TiO 2 and support [ 136 ].…”

Section: Photocatalysts Supported In Ceramic Materialsmentioning

confidence: 99%

Supported TiO2 in Ceramic Materials for the Photocatalytic Degradation of Contaminants of Emerging Concern in Liquid Effluents: A Review

et al. 2021

View full text Add to dashboard Cite

The application of TiO2 as a slurry catalyst for the degradation of contaminants of emerging concern (CEC) in liquid effluents has some drawbacks due to the difficulties in the catalyst reutilization. Thus, sophisticated and expensive separation methods are required after the reaction step. Alternatively, several types of materials have been used to support powder catalysts, so that fixed or fluidized bed reactors may be used. In this context, the objective of this work is to systematize and analyze the results of research inherent to the application of ceramic materials as support of TiO2 in the photocatalytic CEC removal from liquid effluents. Firstly, an overview is given about the treatment processes able to degrade CEC. In particular, the photocatalysts supported in ceramic materials are analyzed, namely the immobilization techniques applied to support TiO2 in these materials. Finally, a critical review of the literature dedicated to photocatalysis with supported TiO2 is presented, where the performance of the catalyst is considered as well as the main drivers and barriers for implementing this process. A focal point in the future is to investigate the possibility of depurating effluents and promote water reuse in safe conditions, and the supported TiO2 in ceramic materials may play a role in this scope.

show abstract

Section: Photocatalysts Supported In Ceramic Materialsmentioning

confidence: 99%

Supported TiO2 in Ceramic Materials for the Photocatalytic Degradation of Contaminants of Emerging Concern in Liquid Effluents: A Review

et al. 2021

View full text Add to dashboard Cite

show abstract

“…Several approaches have already been used to fabricate g-C 3 N 4 /TiO 2 heterostructures, such as sol-gel [ 65 ], hydrothermal [ 58 ]/solvothermal syntheses [ 66 ], wet impregnation [ 67 ] and microwave-assisted methods [ 68 , 69 ]. Apart from the microwave irradiation process, these methods typically require high temperatures and/or long reaction times, hence being energy consuming [ 58 , 66 , 67 , 70 , 71 ].…”

Section: Introductionmentioning

confidence: 99%

Microwave Synthesis of Visible-Light-Activated g-C3N4/TiO2 Photocatalysts

et al. 2023

View full text Add to dashboard Cite

The preparation of visible-light-driven photocatalysts has become highly appealing for environmental remediation through simple, fast and green chemical methods. The current study reports the synthesis and characterization of graphitic carbon nitride/titanium dioxide (g-C3N4/TiO2) heterostructures through a fast (1 h) and simple microwave-assisted approach. Different g-C3N4 amounts mixed with TiO2 (15, 30 and 45 wt. %) were investigated for the photocatalytic degradation of a recalcitrant azo dye (methyl orange (MO)) under solar simulating light. X-ray diffraction (XRD) revealed the anatase TiO2 phase for the pure material and all heterostructures produced. Scanning electron microscopy (SEM) showed that by increasing the amount of g-C3N4 in the synthesis, large TiO2 aggregates composed of irregularly shaped particles were disintegrated and resulted in smaller ones, composing a film that covered the g-C3N4 nanosheets. Scanning transmission electron microscopy (STEM) analyses confirmed the existence of an effective interface between a g-C3N4 nanosheet and a TiO2 nanocrystal. X-ray photoelectron spectroscopy (XPS) evidenced no chemical alterations to both g-C3N4 and TiO2 at the heterostructure. The visible-light absorption shift was indicated by the red shift in the absorption onset through the ultraviolet-visible (UV-VIS) absorption spectra. The 30 wt. % of g-C3N4/TiO2 heterostructure showed the best photocatalytic performance, with a MO dye degradation of 85% in 4 h, corresponding to an enhanced efficiency of almost 2 and 10 times greater than that of pure TiO2 and g-C3N4 nanosheets, respectively. Superoxide radical species were found to be the most active radical species in the MO photodegradation process. The creation of a type-II heterostructure is highly suggested due to the negligible participation of hydroxyl radical species in the photodegradation process. The superior photocatalytic activity was attributed to the synergy of g-C3N4 and TiO2 materials.

show abstract

“…However, its low utilization rate of the visible light, high photocharge carrier recombination rate and small specific surface area limited the photocatalytic performance of g-C 3 N 4 . To overcome these shortcomings, the construction of semiconductor heterojunction was proposed as a widely effective method (You et al, 2018;Kang et al, 2020;Liu et al, 2020b). Liu et al (2020a) synthesized the Z-scheme photocatalyst g-C 3 N 4 /rGO/Bi 2 WO 6 with high degradation rate of ibuprofen (IBF) by microwave-assisted method and found that superoxide radical (•O 2 À ) and hydroxyl radicals (•OH) are the main active species.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Bi₂WO₆/g-C₃N₄ photocatalyst and high degradation of Rhodamine B under visible light irradiation

Wang

Zhang

Zhao

et al. 2021

PRT

View full text Add to dashboard Cite

Purpose The purpose of this paper is to improve the degradation efficiency of Rhodamine B (RhB) by new photocatalytic materials. Design/methodology/approach Binary Z-scheme g-C3N4/Bi2WO6 photocatalytic material was synthesized by the one-step hydrothermal reaction. The construction of Z-scheme heterojunction led to the rapid separation of photogenerated electrons and holes, which would degrade RhB into small molecular substances to achieve the purpose of degradation. Findings It was found that Bi2WO6/25%g-C3N4 displayed the highest photocatalytic activity, which was about 1.44 and 1.34 times higher than that of pure Bi2WO6 and g-C3N4, respectively. According to the trapping experiments, the superoxide radical (·O2−) was the major active species of the RhB decomposition in Bi2WO6/g-C3N4 catalysts. Originality/value The successful synthesis of Z-scheme Bi2WO6/g-C3N4 provides new ideas and references for the design of catalysts with high photocatalytic activity, which should have wide applications in the future.

show abstract

A novel microwave-assisted impregnation method with water as the dispersion medium to synthesize modified g-C3N4/TiO2 heterojunction photocatalysts

Cited by 30 publications

References 37 publications

Supported TiO2 in Ceramic Materials for the Photocatalytic Degradation of Contaminants of Emerging Concern in Liquid Effluents: A Review

Supported TiO2 in Ceramic Materials for the Photocatalytic Degradation of Contaminants of Emerging Concern in Liquid Effluents: A Review

Microwave Synthesis of Visible-Light-Activated g-C3N4/TiO2 Photocatalysts

Synthesis of Bi₂WO₆/g-C₃N₄ photocatalyst and high degradation of Rhodamine B under visible light irradiation

Contact Info

Product

Resources

About

A novel microwave-assisted impregnation method with water as the dispersion medium to synthesize modified g-C3N4/TiO2 heterojunction photocatalysts

Cited by 30 publications

References 37 publications

Supported TiO2 in Ceramic Materials for the Photocatalytic Degradation of Contaminants of Emerging Concern in Liquid Effluents: A Review

Supported TiO2 in Ceramic Materials for the Photocatalytic Degradation of Contaminants of Emerging Concern in Liquid Effluents: A Review

Microwave Synthesis of Visible-Light-Activated g-C3N4/TiO2 Photocatalysts

Synthesis of Bi2WO6/g-C3N4 photocatalyst and high degradation of Rhodamine B under visible light irradiation

Contact Info

Product

Resources

About

Synthesis of Bi₂WO₆/g-C₃N₄ photocatalyst and high degradation of Rhodamine B under visible light irradiation