Facile ball-milling synthesis of CeO2/g-C3N4 Z-scheme heterojunction for synergistic adsorption and photodegradation of methylene blue: Characteristics, kinetics, models, and mechanisms

Wei, Xiaoqian; Wang, Xin; Yu, Peng; Liu, Annai; Chen, Chong; Zou, Weixin; Zheng, Yun; Huang, Jinhua; Zhang, Yue; Yang, Yudan; Naushad, Mu.; Gao, Bin

doi:10.1016/j.cej.2020.127719

Cited by 181 publications

(53 citation statements)

References 62 publications

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“…Cheap and effective photocatalysts are continuously being investigated to obtain high efficiency and the fast removal of contamination in water [ 1 , 3 ]. One of the developments in dye treatment is via the combination of adsorption-photodegradation processes [ 4 , 5 ]. Several studies reported using SBA-15 and silica combined with carbon nitride or titania as an efficient photocatalyst for dye removal [ 4 , 6 , 7 , 8 , 9 ].…”

Section: Introductionmentioning

confidence: 99%

Fast Removal of Methylene Blue via Adsorption-Photodegradation on TiO2/SBA-15 Synthesized by Slow Calcination

et al. 2022

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TiO2/SBA-15 photocatalysts were successfully prepared by impregnating low loading titania to SBA-15 via slow calcination. The photocatalyst is efficient for fast methylene blue removal via adsorption and photodegradation methods. The impregnation of low TiO2 loading via slow calcination enhanced TiO2 dispersion that preserved the SBA-15 porosity and uniform morphology. High interfacial interaction of TiO2/SBA-15 improves TiO2 photoresponse by narrowing the bandgap, resulting in a stronger redox ability. The methylene blue removal on 10%TiO2/SBA-15 followed the pseudo-second-order kinetic model that reached 67% removal efficiency in 90 min. The synergy between adsorption and photodegradation is responsible for the fast methylene blue removal. These results indicate the importance of maintaining the adsorption capacity in SBA-15 after impregnation with TiO2 for efficient adsorption-photodegradation processes, which can be achieved by controlling the deposition of TiO2 on SBA-15. A low titania loading further reduced the cost of photocatalysts, thus becoming a potential material for environmental pollution treatment.

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Section: Introductionmentioning

confidence: 99%

Fast Removal of Methylene Blue via Adsorption-Photodegradation on TiO2/SBA-15 Synthesized by Slow Calcination

et al. 2022

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“…Zou et al synthesized the CeO 2 nanocube–hybridized g-C 3 N 4 composite material, which has an excellent photocatalytic hydrogen performance . Moreover, other CeO 2 /g-C 3 N 4 composites have also been studied. − Although several unexpected developments have been achieved in these studies, CeO 2 nanodots doubly modified with dopants and OVs integrated with g-C 3 N 4 nanosheets (CNNS) to construct the 0D/2D Z-scheme heterostructure and its application in PHE have not been explored. 0D nanodots with a smaller size could decrease the diffusion length of charge carriers, promoting the separation of charge carriers. ,,− Good dispersion on the fully exposed 2D g-C 3 N 4 could create numerous intimate heterojunction interfaces, which would offer more separation and migration pathways for photogenerated charge carriers to ensure that they can be separated more efficiently and quickly. ,, Therefore, anchoring 0D nanodots on 2D nanosheets to form 0D/2D heterojunctions has the potential to improve the PHE performance.…”

Section: Introductionmentioning

confidence: 99%

Dopant and Defect Doubly Modified CeO₂/g-C₃N₄ Nanosheets as 0D/2D Z-Scheme Heterojunctions for Photocatalytic Hydrogen Evolution: Experimental and Density Functional Theory Studies

Zhang

Guo

Zhang

et al. 2021

ACS Sustainable Chem. Eng.

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Exploring novel 2D heterojunction photocatalysts with a wide spectral response and high active site exposure has been a huge challenge. A small-sized catalyst with high dispersibility has been considered an ideal model for maximizing active sites and increasing atomic efficiency. Herein, the 0D/2D Z-scheme heterojunction was designed by in situ solvothermal and subsequent calcination in air by integrating dopant and defect doubly modified CeO2 nanodots and g-C3N4 nanosheets (CNNS). Ultrafine cobalt-doped CeO2 nanodots (≈4 to 5 nm) with enriched oxygen vacancies (Co-CeO2–OVs) were uniformly and tightly anchored on the surface of CNNS to form a heterojunction. The density functional theory (DFT) calculations confirmed that cobalt dopants and oxygen vacancies form impurity energy states at the top of a valence band, thus narrowing the band gap. The optimized 0D/2D heterojunction showed a remarkable hydrogen production rate of ∼203.6 μmol/h, which was approximately 4.9- and 30.8-fold higher than that of CNNS (∼41.2 μmol/h) and CeO2 (∼6.6 μmol/h), respectively. Moreover, a large quantum yield of ∼8.94% was achieved at 420 nm. The 0D/2D heterojunction with a larger intimate area provided abundant reactive active sites and strong electron interactions to excite photogenerated carrier dynamics, and the doping and defect engineering could expand the light response range by regulating the electronic band structure. Strong evidence provided by experimental results and DFT calculations proved the Z-scheme charge transfer pathway. This work not only provided a novel approach to integrate 0D nanodots and 2D nanosheets for the formation of intimate Z-scheme heterointerfaces but also deepened the understanding of the dopant–defect synergistic modification to optimize the band structure and electronic structures for high-efficient solar energy capture and conversion.

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“…As a result, H 2 generation is a novel and environmentallyfriendly research topic among many researchers [8,13,[392][393][394][395]. One of the most recent hydrogen production techniques is the photocatalytic water splitting method via metal oxide-g-C 3 N 4 heterojunctions by using prolific light sources [365,390,[396][397][398][399][400]. For water splitting, the band position of the photocatalysts should be modified to provide the CB position more negative than the H 2 O reduction potential (0 eV vs. Normal Hydrogen Electrode (NHE)) for H 2 generation and more positive than the H 2 O oxidation potential (1.23 eV vs. NHE) for O 2 generation.…”

Section: Other Metal Oxidesmentioning

confidence: 99%

“…The prepared hybrid structure can improve the electrons holes separation and efficiency [483]. Other metal oxides can also be used in the g-C 3 N 4 based heterojunction for organic dye degradation [398,[484][485][486][487]. Bi 2 O 3 /g-C 3 N 4 heterojunctions are the most commonly used composites for organic dye degradation [488,489].…”

Section: Photodegradation Of Organic Pollutantsmentioning

confidence: 99%

A Comprehensive Review of Graphitic Carbon Nitride (g-C3N4)–Metal Oxide-Based Nanocomposites: Potential for Photocatalysis and Sensing

2022

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g-C3N4 has drawn lots of attention due to its photocatalytic activity, low-cost and facile synthesis, and interesting layered structure. However, to improve some of the properties of g-C3N4, such as photochemical stability, electrical band structure, and to decrease charge recombination rate, and towards effective light-harvesting, g-C3N4–metal oxide-based heterojunctions have been introduced. In this review, we initially discussed the preparation, modification, and physical properties of the g-C3N4 and then, we discussed the combination of g-C3N4 with various metal oxides such as TiO2, ZnO, FeO, Fe2O3, Fe3O4, WO3, SnO, SnO2, etc. We summarized some of their characteristic properties of these heterojunctions, their optical features, photocatalytic performance, and electrical band edge positions. This review covers recent advances, including applications in water splitting, CO2 reduction, and photodegradation of organic pollutants, sensors, bacterial disinfection, and supercapacitors. We show that metal oxides can improve the efficiency of the bare g-C3N4 to make the composites suitable for a wide range of applications. Finally, this review provides some perspectives, limitations, and challenges in investigation of g-C3N4–metal-oxide-based heterojunctions.

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Facile ball-milling synthesis of CeO2/g-C3N4 Z-scheme heterojunction for synergistic adsorption and photodegradation of methylene blue: Characteristics, kinetics, models, and mechanisms

Cited by 181 publications

References 62 publications

Fast Removal of Methylene Blue via Adsorption-Photodegradation on TiO2/SBA-15 Synthesized by Slow Calcination

Fast Removal of Methylene Blue via Adsorption-Photodegradation on TiO2/SBA-15 Synthesized by Slow Calcination

Dopant and Defect Doubly Modified CeO₂/g-C₃N₄ Nanosheets as 0D/2D Z-Scheme Heterojunctions for Photocatalytic Hydrogen Evolution: Experimental and Density Functional Theory Studies

A Comprehensive Review of Graphitic Carbon Nitride (g-C3N4)–Metal Oxide-Based Nanocomposites: Potential for Photocatalysis and Sensing

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Facile ball-milling synthesis of CeO2/g-C3N4 Z-scheme heterojunction for synergistic adsorption and photodegradation of methylene blue: Characteristics, kinetics, models, and mechanisms

Cited by 181 publications

References 62 publications

Fast Removal of Methylene Blue via Adsorption-Photodegradation on TiO2/SBA-15 Synthesized by Slow Calcination

Fast Removal of Methylene Blue via Adsorption-Photodegradation on TiO2/SBA-15 Synthesized by Slow Calcination

Dopant and Defect Doubly Modified CeO2/g-C3N4 Nanosheets as 0D/2D Z-Scheme Heterojunctions for Photocatalytic Hydrogen Evolution: Experimental and Density Functional Theory Studies

A Comprehensive Review of Graphitic Carbon Nitride (g-C3N4)–Metal Oxide-Based Nanocomposites: Potential for Photocatalysis and Sensing

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Dopant and Defect Doubly Modified CeO₂/g-C₃N₄ Nanosheets as 0D/2D Z-Scheme Heterojunctions for Photocatalytic Hydrogen Evolution: Experimental and Density Functional Theory Studies