Journal of Environmental Chemical Engineering
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2021
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IF 5.909
Linhai Yang,Xuechang Ren,Yujie Zhang,Zuoyan Chen
This article is an in-depth study of the basis of Cu + -decorated triazine-based g-C 3 N 4 (Cu + /g-C 3 N 4 ) nanosheet-activated H 2 O 2 . In this study, peroxymonosulfate (PMS) was activated by Cu + /g-C 3 N 4 under sunlight and used to treat simulated wastewater RhB. The properties of g-C 3 N 4 and Cu + /g-C 3 N 4 were characterized by UV–Vis DRS and PL . The results indicated that the introduction of Cu + in g-C 3 N 4 can enhance the separation of photogenerated electron-hole pairs. The Cu + /g-C 3 N 4 (1:4) samples exhibited the best PMS activation performance under sunlight when 0.5 g/L catalyst dose and 0.5 mmol/L PMS concentration were used, and the removal rate of RhB reached 95.7% in 30 min. Moreover, better catalytic activity of the system can be achieved in the initial pH range of 2.0–10.0. The investigation results of the catalytic mechanisms showed that the prepared Cu + /g-C 3 N 4 catalyst constructs a dual reaction center of Cu + /Cu 2+ cycling and e CB − / h VB + transfer for efficient PMS activation. The degradation of pollutants benefits from the participation of a variety of free radicals, which are generated by sunlight-assisted heterogeneous activation of PMS. This study has resulted in substantial progress in activating multiple oxidants with a single heterogeneous catalyst and provides a feasible way to treat refractory wastewater using Cu + /g-C 3 N 4 with PMS under sunlight.
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高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2021
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IF 8.128
Yang Li,Zhi Liu,Zhao Li,Qiu Wang
Constructing noble metal-doped g-C 3 N 4 /carbon composites is a feasible route to overcome the intrinsic drawbacks of pristine g-C 3 N 4 for enhanced activity of CO 2 photoreduction. Herein, a novel Ag-doped g-C 3 N 4 /biomass-derived carbon composite with hollow bird's nest-like (Ag-g-C 3 N 4 /BN-C) is designed and prepared via a simple yet effective one-step pyrolysis method. In the Ag-g-C 3 N 4 /BN-C, the highly-dispersed Ag nanoparticles (20–30 nm) with the surface plasmon resonance (SPR) effect act as a significant cocatalyst not only to efficiently trap the photogenerated electrons from g-C 3 N 4 to boost the separation of photogenerated electron-hole pairs but also to produce additional active “hot electrons”, while the conductive quasi-spherical hollow structure of BN-C doubles the specific surface area with multiple reflections of light, providing abundant active sites and more utilization efficiency of light energy. As a result, the Ag-g-C 3 N 4 /BN-C exhibits a remarkably enhanced CO evolution rate of 33.3 μmol·g −1 ·h −1 without addition of any sacrificial reagents and photosensitizers, superior to those of both the pristine g-C 3 N 4 and many reported g-C 3 N 4 -based counterparts. The findings of this work demonstrate a good indication for integrating g-C 3 N 4 with SPR-dependence noble metal and renewable biomass-derived carbon for enhanced CO 2 photoreduction, which may be extended to modify other semiconductor materials for more photocatalytic applications with enhanced activity.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2021
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IF 5.316
Hongmei Chen,Yanyun Fan,Zheng Fan,Hongyan Xu,Danfeng Cui,Chenyang Xue,Wendong Zhang
Photocatalytic water splitting under irradiation by sunlight to achieve hydrogen with the participation of semiconductor materials is deemed as the most promising green and clean energy supply strategy. Hence, it is particularly important and emergency to design photocatalyst with both high activity and stability to perform high-efficiency hydrogen evolution reaction (HER). In this study, we report a competitive coordination strategy to modulate the electron and band structure of g-C 3 N 4 dramatically improving the HER kinetics. Experimental and density functional theory (DFT) calculations results inferred that the modified g-C 3 N 4 by copolymerizing urea and diaminodiphenyl sulfone can promote the effective separation of photogenerated electrons and holes, and simultaneously significantly increase the fluorescence lifetime of g-C 3 N 4 . Specifically, the hydrogen generation rate is 3.7 or 9.6 folds higher of the original carbon nitride at λ > 400 nm and λ > 420 nm, respectively. Additionally, the optimal catalyst exhibits a high apparent quantum yield (7.02%) when the incident wavelength is 420 nm as well as excellent stability. This work will shed a spick-and-span insight for conception and preparation of high-powered metal-free photocatalysts.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2021
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IF 5.316
Qing Yang,Ting Wang,Fang Han,Ziqiang Zheng,Bing Xing,Benxia Li
The solar-driven coproduction of hydrogen (H 2 ) fuel and value-added chemicals from biomass derivatives represents a promising strategy to address the energy and environment issues. Herein, the Ni-Au bimetal modified g-C 3 N 4 photocatalyst was synthesized by a step-by-step photodeposition method and used to promote the photocatalytic coproduction of H 2 and furfural from furfural-alcohol aqueous solution. In the designed Ni-Au/g-C 3 N 4 photocatalyst, g-C 3 N 4 was the main light-harvesting material for generating electron-hole pairs which were separated efficiently by metal/g-C 3 N 4 interface, plasmonic Au nanoparticles further increased the light utilization efficiency, and Ni acted as both electron trap and the active sites for H 2 evolution. Beneficial from the synergy of three components, the Ni-Au/g-C 3 N 4 photocatalyst exhibited 3-folds activity of Au/CN sample toward photocatalytic coproduction of H 2 and furfural. Both photoluminescence spectroscopy and photoelectrochemical measurements demonstrated the more efficient separation and transfer of photogenerated charge carriers in Ni-Au/g-C 3 N 4 photocatalyst. In situ electron spin resonance revealed the generations of hydroxyl radical and carbon center radical in the photocatalytic reaction. Based on the systematic characterizations, a photocatalytic mechanism was proposed and discussed. This work provides a rational construction of photocatalysts for coproduction of H 2 and value-added chemicals from biomass derivatives as well as explores the synergistic effect of bimetallic cocatalyst on enhancing the photocatalysis.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2021
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IF 5.316
Anjli Sharma,Sanjeev Kumar Kanth,Shishi Xu,Ni Han,Lei Zhu,Lele Fan,Chao Liu,Qinfang Zhang
A highly potential visible light active g-C 3 N 4 /Bi 4 NbO 8 X (Cl, Br) heterojunction photocatalysts were constructed at the interface of the coupling between Bi 4 NbO 8 X (Cl, Br) and g-C 3 N 4 . The band gap value of heterojunctions g-C 3 N 4 /Bi 4 NbO 8 Br-20% (CNBNB-3), g-C 3 N 4 /Bi 4 NbO 8 Cl-20% (CNBNC-3), and pristine materials g-C 3 N 4 (CN), Bi 4 NbO 8 Cl and Bi 4 NbO 8 Br were analyzed to be 2.68 eV, 2.69 eV and 2.74 eV, 2.46 eV and 2.48 eV, respectively. The degradation performance of optimized CNBNC-3 and CNBNB-3 photocatalysts revealed much superior removal efficiency of 97% and 84% than the pristine material for rhodamine B. The synthesized photocatalysts maintained good recyclable stability after five consecutive cycles and potentially capable of pollutant degradation. The electrochemical impedance and photoluminescence spectroscopy revealed that the migration and separation efficiency of photogenerated charge carriers of photocatalyst were boosted, while reduced recombination rate was observed. The photocatalytic reaction mechanism also revealed the superoxide ·O 2 − and • OH radicals are the main active species responsible for the pollutant degradation.
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高影响因子
Advanced Composites and Hybrid Materials
·
2021
·Vol. 4
·期 2
·339-349
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IF 5.693
Lin Chunling,Liu Boyang,Pu Liuyue,Sun Yan,Xue Yanli,Chang Mulan,Li Xin,Lu Xingyu,Chen Rong,Zhang Jiaoxia
As a highly active photocatalyst, g-C 3 N 4 /TiO 2 heterojunction nanocomposites were in situ synthesized by hydro-thermal method and calcination using melamine as precursors. The morphology and chemical structure of the prepared photocatalysts were characterized by X-ray diffraction, Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), SEM, UV-vis, and photoluminescence analysis (PLA). At last, the photocatalytic activities of g-C 3 N 4 /TiO 2 nanocomposites to remove fluoride under simulated visible light were evaluated. Results showed that the fluoride removal rate of the prepared g-C 3 N 4 /TiO 2 was about three times than pure g-C 3 N 4 due to the rapid charge transfer and the efficient separation of photogenerated electron-hole pairs in heterojunctions between g-C 3 N 4 and TiO 2 . Graphical abstract Heterojunction g-C 3 N 4/ TiO 2 display the excellent fluoride removal rate due to the rapid charge transfer and efficient separation of electron-hole pairs.
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高影响因子
MATERIALS RESEARCH BULLETIN
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2021
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IF 4.641
Ling Zhou,Kan Hu,Tengguo Dong,Qian Wang,Hengming Huang,Chunhua Lu,Jiahui Kou,Zhongzi Xu
Copolymerization is an efficient method to modulate the intrinsic properties of graphitic carbon nitride (g-C 3 N 4 ). Herein, carbon ring and stereo molecular scaffold co-doped g-C 3 N 4 heterostrcutural nanosheets are constructed for simultaneously enhanced photocatalytic hydrogen evolution under ordinary pressure. The carbon ring changes the in-plane connection of g-C 3 N 4 by the sp 2 -hybridized C N bonds, extending the delocalization of π electrons. The stereo molecular scaffold loses the interlayer stacking of bulk g-C 3 N 4 for easier exfoliation. The synergistic effect of the above two aspects can greatly improve the photocatalytic performance of AGCN. After thermal exfoliation, the highest photocatalytic hydrogen generation activity of A 0.2 G 0.3 CN-E sample is 12.9 times higher than that of MCN. This work provides a strategy to design g-C 3 N 4 photocatalysts with enhanced photocatalytic activity by using synergistic effect.
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高影响因子
OPTICAL MATERIALS
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2021
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IF 3.08
Xu Wang,Hui Xiong,Tanghan Chen,Yayan Xu,Gongxun Bai,Junjie Zhang,Ying Tian,Shiqing Xu
The phosphorus-doped carbon nitride nanosheets (P-g-C 3 N 4 nanosheets) were prepared by ultrasonic stripping. Through the performance characterization, it was found that the P-g-C 3 N 4 nanosheets emitted pure blue light with stable performance. Compared with other metal ions , it was found that the quenching reaction between P-g-C 3 N 4 nanosheets and Fe 3+ was the strongest. The detection limit of Fe 3+ was found to be about 1.63 μM. P-doped g-C 3 N 4 is expected to be an efficient fluorescent probe for Fe 3+ detection.
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高影响因子
NEW JOURNAL OF CHEMISTRY
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2021
·Vol. 45
·期 32
·14655-14664
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IF 3.591
Jing Yan,Xiaomin Song,Bo Jin,Rufang Peng
Nitro explosive photocatalytic degradation is of great importance. Herein, novel and efficient polyethylenimine-g-C3N4/BiOCl (PEI-CN/BC) heterojunctions were constructed through electrostatic self-assembly. Zeta potential results showed that the PEI-CN surface was positively charged. Transmission electron microscopy findings proved that PEI-CN and BC successfully formed a close contact PEI-CN/BC heterostructure. The photocatalytic effect of PEI-CN/BC on PNP degradation was also investigated under simulated light conditions. The results showed that the obtained 1PEI-CN/2BC (mass ratio of PEI-CN to BC was 1 : 2) had the best photocatalytic effect and could completely degrade PNP in 90 min. The apparent rate constant (k) of the reaction was 21.9 and 4.0 times that of PEI-CN and BC alone, respectively. Photoelectrochemistry and photoluminescence results showed that the improved electron–hole separation was the main reason for the superior photocatalytic performance of PEI-CN/BC. Free radical trapping experiments and electron paramagnetic resonance measurements revealed that superoxide radicals were the major active substance in the photodegradation. This work provides inspiration and alternatives in designing new efficient 2D/2D heterogeneous photocatalysts for the efficient degradation of nitro explosive wastewater.
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高影响因子
APPLIED SURFACE SCIENCE
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2021
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IF 6.707
Xiao Zhang,Ping Yang,San Ping Jiang
Photo-catalytic reduction of highly toxic Cr(VI) using graphitic carbon nitride (g-C 3 N 4 ) based photocatalysts under visible light irradiation condition has been attracting considerable attention recent years. Here, we report the development of heterostructured NiCo-layered double hydroxides (LDHs) grown horizontally on g-C 3 N 4 nanosheets with different degrees of crystallinity (amorphous to crystalline), NiCoLDH/g-C 3 N 4 , with high photocatalytic activity for the reduction of toxic hexavalent chromium ions (Cr(VI)) as well as high adsorption capability for congo red (CR) photodegradation under visible light irradiation. The presence of NiCoLDH nanoparticles promotes the adsorption of the anionic pollutants while g-C 3 N 4 in the heterostructure promotes fast photodegradation of CR and reduction of Cr(VI). The NiCoLDH/g-C 3 N 4 composite prepared using amorphous-crystalline g-C 3 N 4 homojunctions shows the best adsorption performance. The kinetic data demonstrates improved correlation coefficient for the pseudo-second-order (R 2 > 0.99) and Freundlich isotherm model. The NiCoLDH/g-C 3 N 4 composite shows an improved separation efficiency of photogenerated electron and hole pairs, leading to its improved Cr(VI) adsorption and photo-reduction performance. The monolayer adsorption capacities of CR and Cr(VI) of the NiCoLDH/g-C 3 N 4 heterostructured composite can be as high as 1100 and 46 mg/g at 30 °C, respectively. This work provides new perspectives for the development of highly efficient g-C 3 N 4 -based composite photocatalysts for wastewater treatment related applications.
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高影响因子
ACS Sustainable Chemistry & Engineering
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2021
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IF 8.198
Tao Yu,Tao Xie,Wei Zhou,Yizhong Zhang,Yiliang Chen,Boyu Shao,Wan-Qian Guo,Xin Tan
Tuning the structural defects of graphite carbon nitride (g-C3N4) is an effective strategy to modify its band structure and promote charge separation, but it is still limited by complex and harsh preparation processes. Herein, g-C3N4 with nitrogen defects were fabricated by one-pot thermal polymerization of urea and fumaric acid. The N–(C)3 site, being the active site for photocatalytic hydrogen evolution, reached at a rate of 94.1 μmol·h–1, which was approximately 2.64 times that of the original g-C3N4. Nitrogen defective g-C3N4 had more electrons and stronger H2O molecule adsorption capacity, identified by systematic experiments and DFT calculations. The carboxyl group of fumaric acid reacted with amino group of urea to prevent self-polymerization process of urea and induce nitrogen defects. The changed band structures promoted the absorption of visible light, effective separation of charge, and increased hydrogen evolution driving force. This work will provide a simple and green approach to prepare nitrogen defective g-C3N4 with tunable band structures.
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高影响因子
INORGANIC CHEMISTRY COMMUNICATIONS
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2021
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IF 2.495
Xueteng Zhu,Hexia Deng,Gang Cheng
Photocatalytic reduction of CO 2 into fuels is a promising approach to address the energy crisis and global warming issues. In this work, g-C 3 N 4 -W 18 O 49 nanocomposite material was constructed by a simple solvothermal method. The W 18 O 49 nanorods have a good dispersion by coupling with the g-C 3 N 4 sheet. Under simulated sunlight irradiation, the g-C 3 N 4 -W 18 O 49 nanocomposite exhibited superior photocatalytic CO 2 reduction capability than that of g-C 3 N 4 and W 18 O 49 . The photo/electrochemical measurements demonstrated that the g-C 3 N 4 -W 18 O 49 heterojunction could accelerate the separation and migration of charge carries, thus improving the activity of photocatalytic reduction of CO 2 into CH 4 and CO.
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高影响因子
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