Enhancement of photocatalytic activity of combustion-synthesized CeO2/C3N4 nanoparticles

Li, Dongfeng; Yang, Ke; Wang, Xiaoqin; Ma, Yue; Huang, Gui‐Fang; Huang, Wei‐Qing

doi:10.1007/s00339-015-9305-y

Cited by 20 publications

(5 citation statements)

References 29 publications

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“…Instead, the type II g‐C 3 N 4 ‐based heterojunction illustrated in Figure b can be constructed more easily. Various metal oxides (TiO 2 , ZnO, WO 3 , CeO 2 , In 2 O 3 , MoO 3 , SnO 2 , Fe 2 O 3 , V 2 O 5 ), metal sulfides (CdS, ZnS, MoS 2 , Zn 1− x Cd x S, ZnIn 2 S 4 ), halides (BiOI, BiOCl, BiOBr, AgI, AgBr), modified g‐C 3 N 4 and other semiconductor (such as Bi 2 WO 6 , BiVO 4 , BiPO 4 , Ag 3 PO 4 , Ta 3 N 5 , SiC) have been used for constructing g‐C 3 N 4 ‐based conventional type II heterojunction systems ( Table 1 ).…”

Section: Categories Of G‐c3n4‐based Heterostructured Photocatalystsmentioning

confidence: 99%

“…Instead, the type II gC 3 N 4 based heterojunction illustrated in Figure1bcan be constructed more easily. Various metal oxides (TiO 2 ,[83][84][85][86][87][88] ZnO,[89] WO 3 ,[90][91][92] CeO 2 ,[93][94][95] In 2 O 3 ,[96][97][98] MoO 3 ,[99] SnO 2 ,[100][101][102][103][104] Fe 2 O 3 ,[105,106] V 2 O 5 ),[107,108] metal sulfides (CdS,[109][110][111][112][113][114] ZnS,[115][116][117] MoS 2 ,[118] Zn 1−x Cd x S,[119] ZnIn 2 S 4 ),[120][121][122] halides (BiOI,[123] BiOCl,[124,125] BiOBr,[126] AgI,[127][128][129] AgBr),[130,…”

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confidence: 99%

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g‐C₃N₄‐Based Heterostructured Photocatalysts

Wang

Jiang

et al. 2017

Advanced Energy Materials

2,100

937

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Thereafter, the photocatalytic degrada tion of polychlorobiphenyls [2] and photo electrocatalytic reduction of CO 2 into hydrocarbon compounds [3] in aqueous semiconductor suspensions greatly broad ened the applications of photocatalysis. Although the photocatalytic technology has got worldwide attention for its eco nomic, clean, safe, and renewable charac teristics, the photocatalytic performance of currently known photocatalysts is still far from commercial applications, especially in solartofuel conversion. [4][5][6][7][8][9][10][11] Generally, the photocatalytic reactions can be divided into three basic processes. First, the semiconductor photocatalysts absorb effective photons whose energy (h v ) is equal to or above their bandgap (E g ), resulting in the generation of electronhole pairs. Second, the photogenerated charge carriers separate and transfer to the surface of photocatalysts. Third, the photogenerated electrons and holes partic ipate in reactions of substances adsorbed on the surface of the photocatalysts. [12,13] Thus, the improvements of the three aforementioned processes play impor tant roles in enhancing the photocatalytic performance. Light absorption is the first essential step of photocatalysis process. The traditional anatase phase TiO 2 photocatalyst is active only under UV light with wavelength below 387 nm due to its wide bandgap (3.2 eV). However, solar energy is mainly concentrated in the visible light region, and UV light accounts for less than 4% of the solar spectrum. [7] In order to achieve maximum utilization efficiency of solar energy, the exploration of visiblelightresponsive photo catalysts is an urgent task. Graphitic carbon nitride (gC 3 N 4 ) as a promising visiblelightresponsive photocatalyst has received worldwide attention due to its fascinating merits, such as moderate bandgap (≈2.7 eV), proper electronic band structure, nontoxicity, low cost, good stability, and easy preparation. [14][15][16][17][18] Since the first report on photocatalytic H 2 evolution over gC 3 N 4 by Wang et al. in 2009, [19] research endeavors toward improving the photocatalytic performance of gC 3 N 4 based photocatalysts have formed a forefront of photocatalysis research. [20][21][22][23][24][25] Bulk gC 3 N 4 powder can be prepared by the thermal poly condensation of lowcost nitrogencontaining organic pre cursors, e.g., urea, thiourea, melamine, cyanamide, dicyan diamide, guanidine hydrochloride, and so on. [26][27][28][29][30][31][32] The pure bulk gC 3 N 4 prepared by this method suffers from several shortcomings, including low specific surface area, insufficient visible light utilization, and, particularly, rapid recombination Photocatalysis is considered as one of the promising routes to solve the energy and environmental crises by utilizing solar energy. Graphitic carbon nitride (g-C 3 N 4 ) has attracted worldwide attention due to its visible-light activity, facile synthesis from low-cost materials, chemical stability, and unique layered structure. However, the pure g-C 3 N 4 photocatalys...

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Section: Categories Of G‐c3n4‐based Heterostructured Photocatalystsmentioning

confidence: 99%

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confidence: 99%

g‐C₃N₄‐Based Heterostructured Photocatalysts

Wang

Jiang

et al. 2017

Advanced Energy Materials

2,100

937

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“…As a result, it is often used as a carrier for photocatalytic and adsorption materials. Over the last few decades, kaolin/TiO 2 , kaolin/CeO 2, CeO 2 /g-C 3 N 4 [ 41 , 42 ] and kaolin/g-C 3 N 4 composites have been investigated [ 43 , 44 , 45 ]. However, the construction of ternary kaolin/CeO 2 /g-C 3 N 4 heterojunction photocatalyst is yet to be reported.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Novel Kaolin-Supported g-C3N4/CeO2 Composites with Enhanced Photocatalytic Removal of Ciprofloxacin

Huang

et al. 2020

Materials

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Herein, novel ternary kaolin/CeO2/g-C3N4 composite was prepared by sol-gel method followed by hydrothermal treatment. The self-assembled 3D “sandwich” structure consisting of kaolin, CeO2 and g-C3N4 nanosheets, was systematically characterized by appropriate techniques to assess its physicochemical properties. In the prerequisite of visible-light irradiation, the removal efficiency of ciprofloxacin (CIP) over the kaolin/CeO2/g-C3N4 composite was about 90% within 150 min, 2-folds higher than those of pristine CeO2 and g-C3N4. The enhanced photocatalytic activity was attributed to the improved photo-induced charge separation efficiency and the large specific surface area, which was determined by electrochemical measurements and N2 physisorption methods, respectively. The synergistic effect between the kaolin and CeO2/g-C3N4 heterostructure improved the photocatalytic performance of the final solid. The trapping and electron paramagnetic resonance (EPR) experiments demonstrated that the hole (h+) and superoxide radicals (•O2−) played an important role in the photocatalytic process. The photocatalytic mechanism for CIP degradation was also proposed based on experimental results. The obtained results revealed that the kaolin/CeO2/g-C3N4 composite is a promising solid catalyst for environmental remediation.

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“…CeO 2 and g‐C 3 N 4 may form heterojunction because of their well‐matched band structures. The g‐C 3 N 4 /CeO 2 composites have been prepared to improve photocatalytic ability in organic pollutant degradation reactions and CO 2 photoreduction reactions ,. But there are few attempts on the application of the composite in hydrogen production.…”

Section: Introductionmentioning

confidence: 99%

Enhancement of Visible‐Light Photocatalytic Hydrogen Production by CeCO₃OH in g‐C₃N₄/CeO₂ System

et al. 2019

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Promoting the separation of photo-generated carriers is significantly important to improve the efficiency of photocatalytic hydrogen production. Therefore, we prepared g-C 3 N 4 /CeCO 3 OH/ CeO 2 (CeCeCN) ternary nanocomposite via an easy synthetic way using g-C 3 N 4 and CeO 2 as reactants. A CeCO 3 OH layer was formed and resulted in the novel ternary photocatalyst. The CeCeCN composite shows superior photocatalytic (PC) H 2 generation performance in sunlight excitation. The H 2 evolution rate is about 764 μmol h À 1 g À 1 , which is over 11 times larger than those of g-C 3 N 4 and CeO 2 . Compared with g-C 3 N 4 and CeO 2 , CeCeCN further shows a larger photo-response current density and a lower charge-transfer resistance. The remarkably increased photocatalytic property of CeCeCN is because of the efficient charge migration induced by the formed heterojunction. Our findings demonstrate that building multi-heterostructures can liberate more excited electrons for efficient hydrogen production under sunlight.

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Enhancement of photocatalytic activity of combustion-synthesized CeO2/C3N4 nanoparticles

Cited by 20 publications

References 29 publications

g‐C₃N₄‐Based Heterostructured Photocatalysts

g‐C₃N₄‐Based Heterostructured Photocatalysts

Synthesis of Novel Kaolin-Supported g-C3N4/CeO2 Composites with Enhanced Photocatalytic Removal of Ciprofloxacin

Enhancement of Visible‐Light Photocatalytic Hydrogen Production by CeCO₃OH in g‐C₃N₄/CeO₂ System

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Enhancement of photocatalytic activity of combustion-synthesized CeO2/C3N4 nanoparticles

Cited by 20 publications

References 29 publications

g‐C3N4‐Based Heterostructured Photocatalysts

g‐C3N4‐Based Heterostructured Photocatalysts

Synthesis of Novel Kaolin-Supported g-C3N4/CeO2 Composites with Enhanced Photocatalytic Removal of Ciprofloxacin

Enhancement of Visible‐Light Photocatalytic Hydrogen Production by CeCO3OH in g‐C3N4/CeO2 System

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g‐C₃N₄‐Based Heterostructured Photocatalysts

g‐C₃N₄‐Based Heterostructured Photocatalysts

Enhancement of Visible‐Light Photocatalytic Hydrogen Production by CeCO₃OH in g‐C₃N₄/CeO₂ System