APPLIED SURFACE SCIENCE
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2021
·
IF 6.707
Huijun Yu,Shasha Xu,Shijie Zhang,Shuguang Wang,Zuoli He
g-C 3 N 4 based heterojunction photocatalysts attract much attention as degradation materials for organic pollutants due to their wide light absorption range and rich photoinduced carriers. Strategies to effectively improve photoelectron separation and transmission have become a research hotspot. Herein, a novel heterojunction TiB 2 -TiO 2 @g-C 3 N 4 photocatalyst with core–shell structure was constructed by in-situ growth of g-C 3 N 4 on the TiB 2 -TiO 2 cores using one-step calcination method. The composite processes a higher photodegradation performance of Rhodamine B (RhB) and 4-Chlorophenol (4-CP) compared to the pure g-C 3 N 4 . The results show that the surface of TiB 2 -TiO 2 cores contains numerous ‘TiB 2 bridges’, as photoinduced carriers transport channels, which effectively accelerate photoinduced e - and h + migration. In addition, the g-C 3 N 4 coated on TiB 2 -TiO 2 cores forms a Z-scheme heterojunction, which hinders the recombination of photogenerated charges resulting in a longer electron lifetime. Furthermore, the TiB 2 also could act as acceptors of electrons for the formation of •O 2– . The main active substances for degradation of RhB are •OH, •O 2– and h + . This strategy is applicable to design highly capable heterojunction photocatalysts by constructing fast electronic transmission channels.
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高影响因子
APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Wen Ge,Kong Liu,Shukang Deng,Lanxian Shen,Peizhi Yang
Construction of heterostructure is an efficient approach to improve the photocatalytic performance of catalysts. Herein, the Bi 6 Fe 1.5 Co 0.5 Ti 3 O 18 (BFCTO) nanoplates are successfully loaded on g-C 3 N 4 nanosheets by a facile chemical process for the first time. The photocatalytic activity of all g-C 3 N 4 /BFCTO catalysts are measured by the degradation of Rhodamine B (RhB) under visible-light irradiation. The results display that g-C 3 N 4 /BFCTO heterojunctions exhibit greatly improved photocatalytic activity compared with corresponding bare g-C 3 N 4 and BFCTO catalysts. Based on the experimental results of photocurrent responses, EIS and ESR, it is clearly demonstrated that the improved activity is attributed to the formation of Z-scheme photocatalyst. The g-C 3 N 4 /BFCTO-2 heterojunction showed the optimal photocatalytic activity with the photodegradation efficiency of 84.9% within 20 min. We hope that the work can provide a new insight for exploring Bi n +1 Fe n −3 Ti 3 O 3 n +3 -based Z-scheme heterojunction for pollutant degradation and environment restoration.
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高影响因子
RESEARCH ON CHEMICAL INTERMEDIATES
·
2021
·Vol. 47
·期 12
·5175-5188
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IF 2.914
Du Yu-Bing,Wang Nan,Li Xiang-Nan,Li Juan,Wu Liang-Peng,Peng Quan-Ming,Li Xin-Jun
Construction of high-efficient and low-cost heterostructure photocatalyst is crucial for hydrogen production in solar driven water splitting. Herein, g-C 3 N 4 -modified TiO 2 nanotubes (TNTs) with confined Pt nanoparticles were prepared via a facile two-step process. The results of structure characterizations by XRD, TEM, and XPS reveal that Pt nanoparticles with the average size of 2–3 nm are embedded in the inner cavity of the TiO 2 nanotube, and amorphous g-C 3 N 4 is attached to the outer wall of anatase TNTs. The as-prepared g-C 3 N 4 /TNTs@Pt ternary composite displays an enhanced visible light-induced absorbance capacity and improved charge carrier recombination rate than that of pure TNTs. The photocatalytic performance is evaluated by hydrogen evolution from water splitting by using methanol as sacrifice agent under solar light illumination. Compared with TNTs@Pt and g-C 3 N 4 /Pt photocatalysts, the as-prepared ternary nanocomposite exhibits the highest photocatalytic performance with a H 2 evolution rate of 15.36 mmol h −1 g −1 . A possible mechanism of photocatalytic H 2 production over the ternary g-C 3 N 4 /TNTs@Pt composite is also proposed. This work not only provides a promising low-cost heterostructure candidate for water splitting, but also paves the way to rational design high-performance photocatalysts in solar-to-fuel conversion.
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高影响因子
COMPOSITES PART B-ENGINEERING
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2021
·
IF 9.078
Saipeng Zhou,Mingming Hou,Yulong Sun,Wenzhe Zhao,Honglin Wang,Quanhui Guo,Xin Yu,Xinqi Ma,Junwei Zhao
Preparation of high-performance semiconductor photocatalysts is often considered to be the challenge and focus in dealing with water contaminations, and attracts numerous concerns and research interests nowadays. In this work, high-performance Z-scheme AgI/(Na,F) doped g-C 3 N 4 composites were synthesized by facile calcination and in-situ deposition methods and employed for ultrahigh-performance degradation of broad-spectrum antibiotics contaminants. The prepared (Na,F) doped g-C 3 N 4 showed narrower bandgaps, enhanced solar-light absorption, and highly improved visible-light photocatalytic performance. Besides, the strong combined interfaces between AgI nanoparticles and (Na,F) doped g-C 3 N 4 was contributing to visible-light harvesting and highly boosted charge separation of the samples, among which AgI/(Na,F)–CN-40% composite presented the best visible-light photocatalytic performance. The photocatalytic reaction rate constant of the AgI/(Na,F)–CN-40% composite was as high as approximately 0.2007 min −1 , which was 65.80 times of pristine g-C 3 N 4 and 3.60 times of AgI, mainly because of the construction of direct Z-scheme charge transfer pathways between AgI and (Na,F) doped g-C 3 N 4 . Finally, the radical scavenger experiments, possible degradation pathways , and photocatalytic mechanism were also proposed.
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高影响因子
APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Dong Liu,Chunling Li,Tianjun Ni,Ranpeng Gao,Jiayu Ge,Fengquan Zhang,Weidong Wu,Jinliang Li,Qian Zhao
Currently, the photo-Fenton oxidation has been increasingly studied in the domain of contaminant elimination. However, the lack of active sites and the slow charge migration in the catalytic process, still limit its practical application. 3D/0D hybrids offer a better opportunity for improving photo-Fenton activity due to their high charge mobility and increased number of catalytic sites, which is highly desirable but remains a large challenge. Herein, 3D interconnected porous g-C 3 N 4 hybridized with Fe 2 O 3 QDs (FCN) was developed and exhibited a porous structure and large specific areas. A large number of active sites and rapid charge separation/migration were achieved by the loading of ultrasmall Fe 2 O 3 QDs on the surface of g-C 3 N 4 . Moreover, the high charge mobility of this material promoted the fast conversion of Fe 3+ to Fe 2+ , resulting in the optimum synergistic effect between the photocatalytic and Fenton oxidation processes. Thus, the FCN catalysts exhibited excellent photo-Fenton oxidation activity towards the decomposition of organic contaminants (such as phenol, 2,4-dibromophenol, 2,4,6-trichlorophenol, rhodamine B and methyl orange). In addition, the roles of active species in the photo-Fenton oxidation reaction were also studied, and the results imply that the hydroxyl radicals played the most important role in the degradation of organic contaminants.
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高影响因子
FIBERS AND POLYMERS
·
2021
·Vol. 22
·期 10
·2664-2672
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IF 2.153
Li Jiahe,Wu Weihong,Meng Weihua,Zhang Weiwei,Zhou Zhaoxi,Wang Tian,Xu Jianzhong,Qu Hongqiang
In this study, we designed a new flame retardant to improve the fire safety performance of epoxy resin (EP). Graphitic carbon nitride (g-C 3 N 4 ) was derived from melamine through a solid-phase reaction, after which nickel ammonium phosphate nanowires (NiNH 4 PO 4 ·H 2 O) were grown on the g-C 3 N 4 using a hydrothermal method. The resulting material (g-C 3 N 4 /NiNH 4 PO 4 ·H 2 O) was a halogen-free flame retardant containing effective flame-retardant elements such as C, N, P, and Ni. Subsequently, g-C 3 N 4 /NiNH 4 PO 4 ·H 2 O was added to EP to test its fire resistance and mechanical properties. When the amount of g-C 3 N 4 /NiNH 4 PO4·H 2 O was 5 phr (per hundred resin), the peak of smoke production rate and peak heat release rate of the EP composite were reduced by 35.42 and 70.4 %, respectively, compared to those of pure EP. Meanwhile, the limiting oxygen index of the EP composite was enhanced to 30.0 % from 24.5 % (pure EP). Finally, the flame-retardant mechanisms of the gas phase and condensed phase were explored.
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高影响因子
SEMICONDUCTOR SCIENCE AND TECHNOLOGY
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2021
·Vol. 36
·期 4
·045025
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IF 2.352
Xiang Yu Liu,Jin Li
Solar-driven nano-semiconductor catalysts have shown great potential in solving environmental pollution and energy issues. They convert solar energy into chemical energy, release strong oxidizing hydroxyl radicals (OH·), and thoroughly degrade organic pollutants. However, these photocatalysts in turn may also damage some organic carriers. Therefore, we have used graphite phase carbon nitride (g-C3N4) as the isolation layer to prevent the carrier polyester fiber (PET) from being oxidized by zinc oxide (ZnO). ZnO-g-C3N4@PET composite has been prepared by hydrothermal method, photoluminescence results indicated that ZnO-g-C3N4@PET has a low photo-generated charge recombination rate, while g-C3N4 improves the visible light response of the composite and exhibits an obvious photocatalytic enhancement effect. In the experiment of degrading methylene blue (MB), the degradation efficiency of ZnO-g-C3N4@PET composite has been significantly improved compared with ZnO@PET and g-C3N4@PET alone. In addition, the prepared photocatalyst also has good reusability and still maintains a high degradation rate after five cycles of tests. In the end, a possible mechanism and a pathway of photocatalytic degradation of MB were proposed. All in all, this is a feasible way to build a highly efficient, environmentally friendly and sustainable supported photocatalyst.
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高影响因子
DIAMOND AND RELATED MATERIALS
·
2021
·
IF 3.315
Cunlu Wang,Guangwei Zhang,Han Zhang,Zihao Li,Yeqian Wen
Porous graphitic carbon nitride nanosheets (PMCNS) photocatalyst with a specific surface area of 92.75 m 2 g −1 was prepared by ammonium carbonate guide structure in a one-pot strategy. Compared with bulk graphitic carbon nitride (MCN), the pores in the PMCNS formed by curling and sealing of the lamella provide more active sites, which promote charge separation and transfer, and inhibit the recombination of photoexcited electron and hole pairs. To confirm our strategy, the photocatalytic degradation of rhodamine B (RhB) and hydrogen evolution ability of PMCNS under visible light were performed, and a significant enhancement was observed, the efficiencies are 12.8 and 3.8 times that of MCN, respectively. This work provides an approach for reconstruction of graphitic carbon nitride (g-C 3 N 4 ) structure to improve the photocatalytic oxidation and reduction capabilities under visible light.
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高影响因子
Nanomaterials
·
2021
·Vol. 11
·期 6
·1480
·
IF 5.076
Weinan Xing,Ke Cheng,Yichi Zhang,Jie Ran,Guangyu Wu
The incorporation of nonmetal group dopants into a graphitic carbon nitride (g-C3N4) framework is fabricated by adding a small amount of hexamethylenetetramine during the thermal polymerization process. The material shows an excellent visible-light photocatalytic H2production performance that is eight times higher than bulk g-C3N4. This outstanding performance is ascribed to the introducing of N-doped carbon, which not only enhances the light absorption and favorsa narrower band gap, but also upshifts the conductionband (CB) potential, resulting in a better reduction ability of electrons. This discovery has potential significancefor the designing of high performance, economic, and environmental friendly photocatalyst for solar energy conversion.Keywords:g-C3N4;nonmetal group dopants;photocatalytic hydrogen production;semiconductors;energy storage and conversion
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PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Pengyan Li,Li Liu,Weijia An,Huan Wang,Wenquan Cui
Photocatalytic CO 2 reduction is a potential way to address simultaneously environmental pollution and energy shortage. However, the difficulties of CO 2 activation and C C coupling lead to quite low conversion efficiency of CO 2 to C2 products. In this study, we constructed Cu 2 O/g-C 3 N 4 heterojunction for photocatalytic CO 2 reduction to ethanol by coupling thermal field and ionic liquids (ILs). The ethanol rate reached 0.71 mmol·g −1 ·h −1 over Cu 2 O/g-C 3 N 4 under photothermalcatalysis, which is 1.89 times that of photocatalysis and 7.05 times that of thermal catalysis. The temperature enhanced thermal motion of the radical, which promotes the formation of ethanol through the ·CH 3 dimerization. The 1-aminopropyl-3-methylimidazolium bromide ILs shows superior CO 2 reduction performance with a high current density (21.3 mA·cm −2 ) than KHCO 3 electrolyte (12.8 mA·cm −2 ). The overpotential is reduced by 0.34 V, which accelerates CO 2 reduction by reducing polarization. It is found that the ILs played a key role in suppressing H 2 O reduction and increasing ethanol yield in this photothermalcatalytic strategy.
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高影响因子
Journal of Inorganic and Organometallic Polymers and Materials
·
2020
·Vol. 30
·期 12
·4847-4857
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IF 1.941
Wang Hui,Zhang Jia-Rui,Wu Xiang-Feng,Wang Chao,Li Yan,Ci Li-Jie,Jia Yun-Ning,Chang Tian-Long,Liu Xu-Tao,Fu Yun-Xuan
Ag 2 WO 4 is a typically noble metal based photocatalyst with highly efficient photocatalytic activity. However, due to photocorrosion, the pristine Ag 2 WO 4 is prone to inactivation during illumination. Constructing composite photocatalyst may be a useful method to promote the stability of Ag 2 WO 4 . In this work, Ag 2 WO 4 /graphitic carbon nitride nanotubes (g-C 3 N 4 NTs) composite photocatalyst was prepared by adopting an in-situ composite strategy. The photocatalytic performance of the samples was discussed by the degradation of rhodamine B under visible light, and the catalytic mechanism was also analyzed. The characterization results show that the photocatalytic efficiency of the as-prepared Ag 2 WO 4 /g-C 3 N 4 NTs composite increases firstly and then decreases along with the increase of the Ag 2 WO 4 content. When the theoretical molar ratio of Ag 2 WO 4 :g-C 3 N 4 NTs reaches 3:2, the photocatalytic degradation efficiency achieves the optimal value, that is 92.4% within 20 min, which obviously exceeds 2.8% of pure Ag 2 WO 4 and 48.9% of pure g-C 3 N 4 NTs. Moreover, the separation and migration efficiency of photoelectron–hole pairs of the composites can be accelerated in comparison with pure samples. In addition, superoxide radicals and hydroxyl radicals play major roles in the photocatalytic degradation process.
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高影响因子
RENEWABLE ENERGY
·
2020
·
IF 6.274
Runren Jiang,Guanghua Lu,Jianchao Liu,Donghai Wu,Zhenhua Yan,Yonghua Wang
Reinforcing migration of charge carrier in g-C 3 N 4 photocatalytic system is critical for photocatalytic H 2 evolution. Herein, we constructed a benzene-ring-incorporated g-C 3 N 4 by copolymerization of urea with N-phenylthiourea. A π electron donor-acceptor conjugated structure is formed in which benzene ring is the donor while triazine ring is the acceptor. It is noteworthy that ultrafast transient absorption spectroscopy and density functional theory calculation were applied to gain more insight into the properties of the benzene ring with g-C 3 N 4 as the electron donor in the triazine ring. As expected, the introduction of the benzene ring into triazine ring of the g-C 3 N 4 displayed extraordinarily aggrandized hydrogen evolution, which not only crucially modified the π electronic structures and promote π-electron availability, but also played the role of a donor to improve the electron-hole separation. This study revealed that the photocatalytic H 2 evolution of the donor-acceptor system can be further improved by inserting suitable π-conjugated as one of the units.
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