JOURNAL OF SOLID STATE CHEMISTRY
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2022
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IF 3.656
Chun Yang,Feng Zhang,Xiao Liu,Yuxin Du,Di Huang,Jun Liu,Lixia Xie,Guiyin Zhou,Jianxin Tang
An important issue in photocatalysis is the light required to carry out the catalytic reaction, so maintaining photocatalytic reaction activity in the dark has been the ultimate target of expanding photocatalytic technology. Herein, we report a photocatalyst g-C 3 N 4 /SrAl 2 O 4 :Eu 2+ ,Dy 3+ through a strategy that couples the energy-storing and light-releasing properties of long afterglow materials and the light-absorbing properties of photocatalytic materials. g-C 3 N 4 /SrAl 2 O 4 :Eu 2+ ,Dy 3+ is able to effectively degrade methyl orange in water under visible light using molecular oxygen in the air, but it maintains significant methyl orange degradation activity after the light is turned off, as if SAO acts as a built-in light source in it. The photocatalytic degradation mechanism is investigated by active species capture experiments, which shows that superoxide radicals (•O 2 − ), hydroxyl radicals (•OH), holes (h + ), and singlet oxygen ( 1 O 2 ) generate during the photocatalytic process. Among them, •O 2 − is the relatively predominantly acting reactive species. This study exemplifies the design of a continuously working photocatalyst with conceptual value for light storage, which provides ideas for practical energy and environmental system applications.
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Journal of Cleaner Production
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2022
·
IF 11.072
Hua Chai,Chunyan Yang,Peng Xu,Peng Wang,Jianhua Qu,Guangshan Zhang
Heterojunction photocatalysts Fe 2 O 3 –ZnO@C/g-C 3 N 4 (FZCCN) were prepared by precipitation and calcination in this study. Systematic characterization demonstrated that the tight interfacial contact was established between Fe 2 O 3 –ZnO@C and g-C 3 N 4 , and the FZCCN-4 (theoretical mass ratios of ZnO and g-C 3 N 4 was 4) had large BET surface area (110.136 m 2 g −1 ). Bisphenol A (BPA) was selected to estimate the photocatalytic properties of FZCCN and the degradation reaction kinetics was analyzed at the same time. The results showed that, FZCCN-4 had the highest removal rate of BPA (100%, 60 min). The degradation rate of BPA by using FZCCN-4 was approximately 32 and 130 times higher than that of g-C 3 N 4 and Fe 2 O 3 –ZnO@C, respectively. ·O 2 − was proved to be the main active species by capture experiment and electron spin resonance. The UV–vis and PL results proved the formation of heterojunction in FZCCN. This study also identified the intermediates of BPA degradation and tested their toxicity. The excellent visible light catalytic performance of Fe 2 O 3 –ZnO@C/g-C 3 N 4 makes it an ideal material for degrading contaminants.
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Frontiers in Chemistry
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2022
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IF 5.545
Qin Yingfeng,Huang Ruiqi,Ye Gao-Jie
The analysis of glyphosate is essential to agricultural production, environment protection and public health. Herein, we proposed a fast and convenient “on-off-on” fluorescence platform for sensitive detection of glyphosate via Cu2+ modulated g-C3N4 nanosheets. The fluorescence of the system was quenched by Cu2+. With the presence of glyphosate, the fluorescence could be restored due to the formation of Cu2+- glyphosate complex. The proposed method was cost-effective with label-free and enzyme-free. Moreover, it exhibits high sensitivity with a low detection limit of 0.01 μg/ml. Furthermore, the proposed method has been successfully monitored glyphosate in real samples.
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PubMed
高影响因子
KOREAN JOURNAL OF CHEMICAL ENGINEERING
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2022
·Vol. 39
·期 12
·3377-3388
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IF 3.146
Sun Shuhan,Li Shiling,Hao Yibing,Yang Xiao,Dou Xiaomin
g/C 3 N 4 -ZnO composite catalysts were synthesized through surface hybridization of the delocalized conjugated- π structure of g/C 3 N 4 with the closely contacted surface of ZnO via a successive and simultaneous calcination procedure, and two kinds of photocatalysts, g/C 3 N 4 -ZnO1 and g/C 3 N 4 -ZnO2, were obtained. Heterojunctions were formed between the two components, which promote the separation of photogenerated carriers efficiently, and then enhanced the degradation of 100 mg/L of AMX The degradation rate of g/C 3 N 4 -ZnO1 was 1.54, 11.33, and 2.52-fold that of g/C 3 N 4 -ZnO2, g/C 3 N 4 and ZnO, respectively, at a 3.5-h reaction period, with the dosage of 0.3 g/L, and solution pH at 7.0±0.2. The recycle and reuse ability was excellent and 90.5% of AMX mitigation was achieved in the fifth cycle. For g/C 3 N 4 -ZnO1, electrons migrated from the conduction band of g/C 3 N 4 to that of ZnO via the heterojunction. ·OH and h + were the main active species for AMX degradation, compared to ·O
− 2
dominated for g/C 3 N 4 . Twelve intermediate products were identified, and two degradation pathways were inferred for g/C 3 N 4 -ZnO1 and g/C 3 N 4 -ZnO2, respectively. Finally, transformation products without lactam rings were achieved, which lost most of the antibacterial potencies, and the ecotoxicity was also dramatically decreased as indicated by the ECOSAR program.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2022
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IF 5.518
Shangyuan Ni,Zhengrong Fu,Lin Li,Manying Ma,Yuelin Liu
Construction of heterojunction between semiconductors is considered an effective strategy for enhancing photocatalytic capability. Herein, this work prepared an abundant porous g-C 3 N 4 /TiO 2 photocatalyst , with the two-dimensional (2D) nanosheet g-C 3 N 4 and nanoparticle TiO 2 . The heterojunction both enhanced the ultraviolet (UV) light absorption ability, and inhibited the recombination of photogenerated electron-hole (h + ) pairs. As expected, the optimal 4 % g-C 3 N 4 /TiO 2 (g-C 3 N 4 :TiO 2 = 1:25) exhibited a prominent degradation efficiency of 96.53 % in the photocatalytic performance of tetracycline hydrochloride (TCH) under UV irradiation . The recycling of the heterojunction photocatalyst g-C 3 N 4 /TiO 2 remained stability and reusability. The main active species were·O 2- , h + and·OH, and the formation of internal electric field on the step-scheme (S-scheme) heterojunction interface accelerated the migration of photogenerated carriers. Moreover, several environmental factors on degradation such as dose, pH, and the initial concentration of TCH were investigated. This work could be spread to the conceive of other S-scheme heterojunction photocatalysts in application to different environmental demands.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2022
·
IF 5.518
Jinxing Hou,Guodong Dai,Jiuwu Wang,Xian Sun,Yue Situ,Hong Huang
A novel ternary polythiophene/Ag/protonated g-C 3 N 4 nanosheets (PTh/Ag/pCN) nanocomposite was constructed by electrostatic self-assembly strategy. The as-prepared 5% PTh/Ag/pCN exhibits excellent visible light photocatalytic performance toward methylene orange (MO), which is 6 and 3.7 times higher than pCN and PTh, respectively. The result was dominantly ascribed to the forming of Z-scheme heterojunction due to the synergetic effects of pCN, Ag and PTh, which is conductive to the separation of photogenerated charges. Meanwhile, the radical trapping experiments and ESR techniques proved that the photogenerated holes and superoxide radicals are vital reactive substances. This study provides a powerful approach to enhance catalytic activity of conjugated polymer photocatalyst .
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
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2022
·Vol. 29
·期 50
·76404-76416
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IF 5.19
Hu Jie,Lu Songhua,Ma Jianfeng,Zhu Fang,Komarneni Sridhar
In this paper, the g-C 3 N 4 /ZnIn 2 S 4 composite was synthesized by a two-stage hydrothermal method. The microstructure, surface, and optical properties of the composite were thoroughly characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), Brunauer-Emmett-Teller (BET) surface area analysis, and UV-Vis absorption spectroscopic analysis. The removal capacity of Cr(VI) was optimized by using ZnIn 2 S 4 loaded in the composite. Meanwhile, the optimal pH environment for the reduction of Cr(VI) was determined to be about pH 3, and the reduction efficiency could reach more than 99% within 60 min. Further, the results of UV-Vis absorption analysis indicated the high and wide range of light absorption by composite compared with pure g-C 3 N 4 . Therefore, the enhanced photocatalytic performance of the composite could be attributed to the well-matched energy band structure between g-C 3 N 4 and ZnIn 2 S 4 , which apparently promoted the effective separation and transfer of photogenerated carriers. In addition, the composite showed good stability in the visible light catalytic reaction, and the possible mechanism of the photocatalytic activity of Cr(VI) reduction by the composite was proposed.
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JOURNAL OF ELECTRONIC MATERIALS
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2022
·Vol. 51
·期 10
·5508-5520
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IF 2.047
Wang Yan,Zheng Zhanshen,Li Yuanliang,Jia Pengwei,Liu Tong
Degradation of harmful pollutants is the key to water pollution control. Herein, a series of BiOI/g-C 3 N 4 -Ag 2 O (BCNA) heterojunction photocatalysts were prepared by a simple liquid-phase synthesis method for photocatalytic degradation of organic pollutants under visible light. The crystal structure, morphology, and elemental composition of the synthesized photocatalysts were characterized by x-ray diffractometer (XRD), scanning electron microscope (SEM), transmission electron microscope (TEM), and x-ray photoelectron spectroscopy (XPS). The experimental results showed that compared with g-C 3 N 4 and BiOI, BiOI/g-C 3 N 4 -Ag 2 O composite showed the best photocatalytic activity when the Ag 2 O loading was 14.68 wt.%, and the removal rate of rhodamine B (RhB) could reach 98% after 30 min, and the photodegradation showed good stability through the cycle tests. In addition, UV–Vis diffuse reflectance spectroscopy (UV–Vis DRS), photoluminescence excitation spectrum (PL), and photoelectrochemical measurements confirmed that the enhanced photoactivity of BiOI/ g-C 3 N 4 -Ag 2 O is due to the formation of ternary heterojunction, which not only amplifies the visible light response of g-C 3 N 4 but also improves the separation and migration rate of photoinduced carriers. Finally, a possible mechanism of charge separation and transfer for ternary heterojunction photocatalysts was proposed. This study extends the application range of g-C 3 N 4 for RhB degradation and provided a new opportunity for environmental remediation.
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Journal of Environmental Chemical Engineering
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2022
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IF 7.968
Kailin Wang,Songyu Yang,Yan Wu
Dual cocatalysts play an important role in photocatalytic water splitting to hydrogen production . In this paper, Fe-doped Co 3 O 4 (Fe-Co 3 O 4 ) and Pt were loaded on the surface of g -C 3 N 4 to enhance the water photocatalytic splitting, in which Fe-Co 3 O 4 was used as an oxidation cocatalyst to capture the photo-generated holes of g -C 3 N 4 , and Pt was used as a reduction cocatalyst to transfer photo-generated electrons. Under the irradiation of visible light, its hydrogen production rate reaches up to 3.015 mmol g −1 h −1 , which is 3.01 times higher than that of g -C 3 N 4 loaded with Pt. Pt and Fe-Co 3 O 4 dual cocatalysts not only promote the migration rate of photo-generated electrons and holes on the surface of g -C 3 N 4 , but also improve the light absorption capacity of visible light. The interfacial electric field built from the p-n heterojunction of Fe-Co 3 O 4 / g -C 3 N 4 drives photo-generated electrons in Fe-Co 3 O 4 flowing to the holes of g -C 3 N 4 , which further inhibiting the recombination of g -C 3 N 4 photo-generated carriers. This work provides a reference for the development of high-efficiency photocatalyst and an effective support for the development of semiconductor cocatalyst.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2022
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IF 7.139
P. Velusamy,Shanhu Liu,Ruimin Xing,M. Sathiya,Awais Ahmad,Munirah D. Albaqami,Reham Ghazi Alotabi,Elangovan Elamurugu,M. Senthil Pandian,P. Ramasamy
Due to their superior optoelectronic characteristics and affordable cost, doped few-layered g-C 3 N 4 (FCN) semiconductor nanostructures are attractive for photocatalytic and photoelectrochemical (PEC) water splitting applications. Nano heterostructures composed of Praseodymium (Pr)-doped few-layered graphitic carbon nitrides (FCN) and bismuth oxy iodide (BiOI) are manufactured using thermal condensation and hydrothermal technique in two steps. The inclusion of Pr dopant not only modifies the FCN by increasing its porosity and specific surface area, but also improves electron-hole separation and charge transfer. The metal-free nano heterostructure (Pr: FCN/BiOI) that was created exhibits a strong electron-hole separation. The observed rapid charge transit in a heterojunction results in a low rate of charge recombination. Thus, the produced metal-free nano heterostructure overcomes the barrier of FCN's high photo-charge carrier recombination rate. This study investigates the influence of Pr-doping on the structural, optical, electrical conductivity , and PEC characteristics of produced heterostructures. The addition of Pr dopant to FCN increases its ability to absorb solar light. The photocurrent density of the 1.5 wt percent Pr: FCN/BiOI nano heterostructure is 16.8 times greater than that of the 1.5 wt percent Pr: FCN nanostructure. In comparison to the other Pr-doping doses, it exhibits a high hydrogen evolution reaction (HER) photocurrent density (18.21 mA/cm 2 ) and hydrogen evolution rate (3400 mol h −1 cm −2 ) under solar light irradiation (420 nm). The current work gives significant insight into the optimization of composition and structural features for FCN photoelectrocatalysis with excellent performance.
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APPLIED SURFACE SCIENCE
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2022
·
IF 7.392
Dongxu Wang,Juan Chen,Huinan Che,Peifang Wang,Yanhui Ao
Development of immobilized composite photocatalysts for efficient inactivation of algal cells is important because of the features of easy recycling and high stability. Herein, ultrathin g-C 3 N 4 (SCN) are embedded into cellulose acetate (CA) matrix to form CA/SCN composite membranes. The obtained photocatalytic membranes exhibit the properties of thickness uniformity, flexible and higher light absorption compared to the bulk one. Under visible light, 92% of algal can be removed by the optimal CA/SCN photocatalytic membrane (CA/SCN-200). During photocatalytic algal inactivation, algal cells occur photosynthetic activity decrease, antioxidant system collapse and membrane damage. In addition, algal organic matters and MC-LR can also be removed during the photocatalytic process. More importantly, large area membrane which also exhibits high algal removal performance can be prepared easily. This work provides a new way to develop high performance photocatalytic membranes for algal removal.
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CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Shuaizhen Li,Zhibo Zheng,Siwei Liu,Zhenguo Chi,Xudong Chen,Yi Zhang,Jiarui Xu
High-efficiency heat-dissipation materials are in urgent need in microelectronics industry in 5G era. However, large-scale, low-cost, and high-efficiency preparation technologies still have great challenges. Here, ultrahigh thermal and electric conductive graphite films prepared by graphite-phase carbon nitride (g-C 3 N 4 ) catalyzed graphitization of polyimide film (PI) were reported for the first time. The graphite film obtained from 0.25 wt% g-C 3 N 4 catalyzed polyimide graphitization (G0.25) has homogeneous and perfect graphene structure and state-of-the-art properties. The d -spacing of the graphite layers is about 0.335 nm, which is similar to the ideal layer thickness of graphene (0.334 nm). The thermal conductivity is 1781 W·m −1 ·K −1 and the conductivity is 1.63 × 10 6 S·m −1 , which is 1.49 and 2.18 times of graphite film from pure PI film, 1.94 and 2.34 times of graphite film from commercialized Kapton film (I-film), respectively. The thermal conductivity of G0.25 film is 4.52 times of Cu and 7.46 times of Al. More importantly, the addition of g-C 3 N 4 can reduce the graphitization temperature from 2800 to 2500 ℃, which can reduce the energy consumption by 20.5% in the whole polyimide graphitization process. The developed preparation technology has important guiding significance and very attractive industrial application value for the preparation of large-scale, low cost and high-quality heat dissipation materials.
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