Micromachines
·
2023
·Vol. 14
·期 5
·941
·
IF 3.4
Qiuping Li,Nuan Wen,Wu Zhang,Liansheng Yu,Jinghui Shen,Shuxian Li,Yuguang Lv
g-C3N4and g-C3N4/TCNQ composites with different doping levels were prepared using the copolymerization thermal method with melamine as a precursor. XRD, FT-IR, SEM, TEM, DRS, PL, and I-T characterized them. The composites were successfully prepared in this study. The photocatalytic degradation of pefloxacin (PEF), enrofloxacin (ciprofloxacin), and ciprofloxacin (ciprofloxacin) under visible light (λ > 550 nm) showed that the composite material had the best degradation effect on PEF. When TCNQ doping is 20 mg and catalyst dosage is 50 mg, the catalytic effect is the best, and the degradation rate reaches 91.6%, k = 0.0111 min−1, which is four times that of g-C3N4. Repeated experiments found that the cyclic stability of the g-C3N4/TCNQ composite was good. The XRD images were almost unchanged after five reactions. The radical capture experiments revealed that ·O2−was the main active species in the g-C3N4/TCNQ catalytic system, and h+also played a role in PEF degradation. And the possible mechanism for PEF degradation was speculated.Keywords:TCNQ;graphite phase carbon nitride;pefloxacin;photocatalysis
研究领域:
材料科学
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环境科学
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产品关联
DOI
PubMed
高影响因子
Nanomaterials
·
2021
·Vol. 11
·期 12
·3266
·
IF 5.076
Yang Li,Yue Lu,Zhaoyu Ma,Lianqing Dong,Xiaofang Jia,Junying Zhang
Graphitic carbon nitride (g-C3N4) has been widely studied as a photocatalyst for the splitting of water to produce hydrogen. In order to solve the problems of limited number of active sites and serious recombination rate of charge-carriers, noble metals are needed as cocatalysts. Here, we selectively anchored Pt nanoparticles (NPs) to specific nitrogen species on the surface of g-C3N4via heat treatment in argon–hydrogen gas mixture, thus achieving g-C3N4photocatalyst anchored by highly dispersed homogeneous Pt NPs with the co-existed metallic Pt0and Pt2+species. The synergistic effect of highly dispersed metallic Pt0and Pt2+species makes the catalyst exhibit excellent photocatalytic performance. Under the full-spectrum solar light irradiation, the photocatalytic hydrogen production rate of the photocatalyst is up to 18.67 mmol·g−1·h−1, which is 5.1 times of the catalyst prepared by non-selective deposition of Pt NPs.Keywords:graphitic carbon nitride;platinum;selective deposition;photocatalytic hydrogen production
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Environmental Chemical Engineering
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2024
·
IF 7.4
Zhilong Zhang,Lushao Gong,Xingyu Zhan,Bo Hong,Xinqing Wang,Yingchun Xia,Yunxiong Zeng
Silver phosphate (Ag 3 PO 4 ) is a promising photocatalyst, but the photo-corrosion issue limits an effective and comprehensive photocatalysis degradation of tetracycline (TC). In this work, a unique graphitic carbon nitride-Ag 3 PO 4 (KCN-AP (40 %) ) core-shell structure was prepared via a simple chemical sedimentation method. The unique graphitic carbon nitride sheet encloses Ag 3 PO 4 to trap excited electrons from the conduction band position of Ag 3 PO 4 , suppressing the reduction of Ag + and Ag metal deposition on the surface of Ag 3 PO 4 . Under visible light irradiation, the optimized KCN-AP (40 %) can photodegrade nearby 100 % of TC within 20 min with a first-order kinetic constant of 0.127 min −1, which is 3.34 and 3.97-folds higher than those of Ag 3 PO 4 and graphitic carbon nitride, respectively. A series of factors that may affect photoactivity of KCN-AP (40 %) including pH, inorganic ions, and organic matter are investigated. In final, the photodegradation mechanisms and intermediates were proposed based on ex-situ HPLC-MS. This work explains the deep decomposition of TC and presents a facile approach for designing and manufacturing Ag 3 PO 4 based nanohybrids.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2024
·
IF 13.3
Huagen Liang,Anhu Wang,Ruolin Cheng,Fu Chen,Palanisamy Kannan,Costas Molochas,Panagiotis Tsiakaras
The emerging photocatalytic production of hydrogen peroxide (H 2 O 2 ) using graphitic carbon nitride (g-C 3 N 4 ) has attracted a lot of attention for its potential applications in various fields. However, However, the catalytic activity of pure g-C 3 N 4 is still limited. Herein, Bi, K co-doped g-C 3 N 4 (Bi x K y -CN) was prepared by co-thermal polymerization of a mixture of potassium nitrate, bismuth nitrate, melamine, and urea. The obtained Bi 3.6 K 3 -CN composite possesses more negative conduction and valence band positions that can, to some extent, enhance photocatalytic performance by lowering the energy barrier of redox reactions and by enhancing electron absorption capacity. Additionally, the pyrolysis process of the potassium nitrate and bismuth nitrate has a considerable impact on the formation of the morphology of g-C 3 N 4 , generating a porous lamellar-structure with nitrogen defects, resulting in increased oxygen adsorption and utilization capacity. These synergistic effects enable Bi 3.6 K 3 -CN to exhibit excellent photocatalytic activity and cycling stability for H 2 O 2 production. After 3 hours of visible light irradiation, the production of H 2 O 2 catalyzed by Bi 3.6 K 3 -CN can reach 1207.72 μmol L -1 , which is 57 times higher than that of pure g-C 3 N 4 .
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2017
·
IF 9.446
Jing Ding,Wei Xu,Hui Wan,Dashui Yuan,Chong Chen,Lei Wang,Guofeng Guan,Wei-Lin Dai
Vacancy defect in the semiconductors plays an important role in the improvement of the electronic structure and the increase of specific reaction sites for reactant molecules, and consequently enhancing the photocatalytic activity of semiconductor photocatalysts. Through high-temperature thermal condensation of a nitric acid-pretreated melamine precursor, nitrogen vacancies were successfully introduced in the framework of g-C 3 N 4 . The nitrogen vacancies located at the uncondensed terminal NH x lattice sites were conducive to the enhancement of optical absorption, the improvement of the separation efficiency of the photogenerated charge carrier and the increase of surface area, which was beneficial to the photocatalytic oxidation process. More significantly, the novel CNNA(X) were used as efficient photocatalysts in the green process of aromatic aldehydes from the photocatalytic selective oxidation of aromatic alcohols and the photocatalytic degradation of organic pollutants. CNNA(X) samples exhibited enhanced photocatalytic activity and excellent recyclability and stability. The 68.3% benzyl alcohol conversion and almost 100% selectivity was observed for the CNNA (0.9) photocatalyst, higher than that of pure g-C 3 N 4 . Meanwhile, CNNA (0.9) showed superior photocatalytic degradation performance of organic dyes (RhB and MO). Furthermore, the underlying photocatalytic oxidation mechanism was proposed by the controlled experiments using radical scavengers.
研究领域:
材料科学
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环境科学
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化学工程
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产品关联
DOI
高影响因子
Catalysts
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2023
·Vol. 13
·期 3
·619
·
IF 3.9
Chen Yang,Xuefeng Hu,Yaxing Bai,Beichuan Cai,Yujie Li
In this study, a simple and low-energy synthesis scheme of Fe single-atom anchored carbon nitride was reported to improve the photocatalytic performance of g-C3N4. Synthesized Fe single-atom doped graphite carbon nitride (Fe-SACs/g-C3N4) showed high activity and stability for the degradation of 2-mercaptobenzothiazole (MBT); under visible light irradiation, 99% of MBT could be degraded within 35 min, and the degradation ability basically did not decline after five cycles, mainly due to the synergistic effect of the Fe single atoms and carbon nitride. The results of X-ray absorption fine structure (EXAFS), X-ray photoelectron spectroscopy (XPS), and density functional theory calculations show that the single-atom Fe forms Fe-N4coordination with pyridine nitrogen to generate a new electron transfer channel, which can significantly improve the in-plane separation and transfer of carriers, finally enhancing the generation of superoxide radicals. This is confirmed by time-resolved photoluminescence, photoelectron chemistry, and electron spin resonance measurements. The main intermediates of MBT degradation were determined using a liquid chromatograph–mass spectrometer (LC-MS), and a possible photocatalytic mechanism based on the quenching experiment and electron paramagnetic resonance (EPR) test was proposed. A deep understanding of the contribution of Fe single-atom sites with clear local coordination structures will help to design effective catalysts for photocatalytic performance.Keywords:graphitic carbon nitride;single-atom;NaBH4reduction;photocatalytic degradation
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR STRUCTURE
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2023
·
IF 3.8
Xin Yan,Na Zhang,Zhiliang Liu,Chunfang Du
In this paper, 1T/2H mixed-phase MoS 2 /g-C 3 N 4 composites (1T/2H-MG) were successfully synthesized by a simple two-step calcination method and used for Cr(VI) removal from aqueous environment. A series of characterization methods were used to characterize the microstructure and surface morphology of the prepared materials. The experiment results showed that 1T/2H-MG (1:12) composite with good pH and temperature adaptability could completely remove Cr(VI) (100 mg∙L –1 ) within 50 min and showed an excellent adsorption capacity of 342.06 mg∙g –1 . The presence of abundant sulfur defects in 1T/2H-MG composite could provide more adsorption and reduction active sites, which was the main reason for the enhanced removal efficiency of 1T/2H-MG in comparison with pure MoS 2 and g-C 3 N 4 . This work not only contributes an excellent adsorbent for the wastewater treatment, but also provides evidences for the defects engineering.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2021
·
IF 13.273
Li Lei,Qiuxia Tu,Ling Jiao,Song Xiang,Li Wang,Xia Ran,Bo Xiao,Guangwei Feng,Jian Feng,Chunlin Zhang
Mitochondrial damage mediated by reactive oxygen species (ROS) is a major contributory factor to Parkinson’s disease (PD) pathogenesis. The use of hemin-based nanomaterials to control ROS production can protect against neurological damage. Here, we report the rational design of a uniform and water-soluble artificial nanozyme based on an ultrathin graphitic carbon nitride (g-C 3 N 4 ) nanosheet with loaded hemin to reduce ROS and treat PD. The g-C 3 N 4 not only acted as a scaffold for hemin loading but also improved the stability, cytotoxicity, and catalytic action of hemin. The integration of g-C 3 N 4 increased hemin’s peroxidase activity by 31.7%, promoting effective oxidation of the substrate 3,3′,5,5′-tetramethybenzichne (TMB) in the presence of H 2 O 2 to a blue-colored solution after 10 min’ incubation at room temperature. Moreover, CN-hemin exhibited good biocompatibility and could effectively scavenge intracellular ROS and reduce cytotoxicity induced by H 2 O 2 and 6-hydroxydopamine (6-OHDA). In vivo animal studies using nematode transgenic hus111 strain and 6-OHDA pretreated C. elegan s wild-type Bristol (N2) as models further showed that CN-hemin extended their lifespan and restored dopamine-dependent behaviors such as area-restricted searching, ethanol avoidance, and the basal slowing response by reducing ROS-mediated neurotoxicity. Nanomaterials using CN-hemin enzyme mimicry have potential biomedical applications, including the treatment of PD and disorders related to ROS metabolism.
研究领域:
神经科学
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生物医学工程
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材料科学
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DOI
高影响因子
JOURNAL OF APPLIED PHYSICS
·
2022
·Vol. 132
·期 18
·
IF 2.877
Zheng Xiaochun,Ren Shoutian,Gai Qixiao,Wang Yidi,Liu Wenjun
Various defects of nanocomposites inevitably bring some harmful effects on their photoelectric performance, especially considering that interface defects seriously hinder the carrier interfacial transfer. Here, the interface optimization can be realized between graphitic carbon nitride (C 3 N 4 ) and CoP co-catalyst by the introduction of good conductive carbon nanosheets (CNs). As a result, the defect density of synthesized C 3 N 4 /CNs/CoP is reduced to 1.40 × 10 12 cm −3 from 2.55 × 10 12 cm −3 of C 3 N 4 /CoP, and its interface impedance is correspondingly reduced to 34% of that of C 3 N 4 /CoP. Therefore, the optimal H 2 evolution rate of 5.26 mmol g −1 h −1 and apparent quantum efficiency of 9.27% at 420 nm are realized, which are 4.8 and 8.1 times that of C 3 N 4 /CoP photocatalyst in the absence of CNs, respectively. This work provides a general solution to reduce defect density and carrier transfer resistance in nanocomposites by the introduction of a highly conductive buffer layer.
研究领域:
材料科学
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光催化
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能源科学
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DOI
高影响因子
JOURNAL OF NANOPARTICLE RESEARCH
·
2014
·Vol. 16
·期 8
·1-8
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IF 2.278
Ren Yanlin,Zhao Qidong,Li Xinyong,Xiong Wei,Tade Moses,Liu Lihong
A novel visible-light-activated photocatalyst consisting of porous graphitic C 3 N 4 nanosheets and Ag 3 PO 4 nanoparticles were synthesized through a tunable in situ deposition method. The morphology and microstructure of the C 3 N 4 /Ag 3 PO 4 nanocomposites were carefully characterized by scanning electron microscope, TEM, X-ray diffraction (XRD), energy-dispersive X-ray analysis (EDX), X-ray photoelectron spectra, and so on. The porous C 3 N 4 /Ag 3 PO 4 nanocomposites were featured by the typical platelet-like morphology, with an average crystallite size of about 39 nm. The coexistence of porous graphitic C 3 N 4 nanosheets and Ag 3 PO 4 nanoparticles is confirmed via the XRD and EDX results. Owing to its narrower band gap of Ag 3 PO 4 , the nanocomposites displayed a significant redshift of UV–Vis spectral absorption edge together with expanded light absorption in comparison with g-C 3 N 4 nanosheets. The photocatalytic activity of the prepared C 3 N 4 /Ag 3 PO 4 nanocomposites is demonstrated by the photodegradation of 4-chlorophenol (4-CP). The C 3 N 4 /Ag 3 PO 4 nanocomposites displayed higher photocatalytic activity than pure C 3 N 4 or Ag 3 PO 4 , which could be attributed to the interfacial effect of the nanocomposites in inhibiting the unfavorable recombination of photogenerated electrons and holes. Electron spin resonance spin-trap study implied that the generation of hydroxyl radicals plays the key role in the photodegradation of 4-CP by the C 3 N 4 /Ag 3 PO 4 nanocomposites under visible light irradiation.
研究领域:
材料科学
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环境化学
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纳米技术
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光催化
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污染治理
✓ 已验证
DOI
高影响因子
Cell Reports Physical Science
·
2022
·
IF 7.832
Yang Ding,Soumyajit Maitra,Daniel Arenas Esteban,Sara Bals,Henk Vrielinck,Tarek Barakat,Subhasis Roy,Gustaaf Van Tendeloo,Jing Liu,Yu Li,Alexandru Vlad,Bao-Lian Su
Artificial photosynthesis of H 2 O 2 , an environmentally friendly oxidant and a clean fuel, holds great promise. However, improving its efficiency and stability for industrial implementation remains highly challenging. Here, we report the visible-light H 2 O 2 artificial photosynthesis by digging pro-superoxide radical carbon vacancies in three-dimensional hierarchical porous g-C 3 N 4 through a simple hydrolysis-freeze-drying-thermal treatment. A significant electronic structure change is revealed upon the implantation of carbon vacancies, broadening visible-light absorption and facilitating the photogenerated charge separation. The strong electron affinity of the carbon vacancies promotes superoxide radical ( ⋅ O 2 − ) formation, significantly boosting the H 2 O 2 photocatalytic production. The developed photocatalyst shows an H 2 O 2 evolution rate of 6287.5 μM g −1 h −1 under visible-light irradiation with a long cycling stability being the best-performing photocatalyst among all reported g-C 3 N 4 -based systems. Our work provides fundamental insight into highly active and stable photocatalysts with great potential for safe industrial H 2 O 2 production.
研究领域:
材料科学
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环境科学
·
化学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2020
·
IF 6.155
Xiangang Lin,Xiaojuan Hou,Lixia Cui,Shiqiang Zhao,Hong Bi,Haiwei Du,Yupeng Yuan
Increasing the availability of π-electron in graphitic carbon nitride (g-C 3 N 4 ) can reduce the band gap and thus enhance the photocatalytic hydrogen (H 2 ) generation activity upon exposure to visible light. However, such strategy has not yet been largely applied to increase the H 2 generation of g-C 3 N 4 . Herein, we successfully increased the amount of π-electron in g-C 3 N 4 by incorporating π-electron-rich benzene rings through copolymerization of melamine and trimesic acid in air. The incorporation of benzene rings not only extends the light absorption of g-C 3 N 4 to 650 nm, but also improves the electrical conductivity due to delocalization of π electrons in benzene rings. As a result, a 3.4 times enhancement of photocatalytic H 2 generation was achieved from the g-C 3 N 4 with benzene ring incorporation in comparing with that of pristine g-C 3 N 4 . More interestingly, H 2 generation still occurs under irradiation of the light of λ ≥ 490 nm, above the absorption edge of pristine g-C 3 N 4 (∼ 460 nm), illustrating the positive effectiveness of incorporated benzene rings on enhancing the H 2 generation capacity of g-C 3 N 4 . The present work manifests the advantages of increasing π-conjugated electrons on designing highly active g-C 3 N 4 photocatalysts.
研究领域:
材料科学
·
能源化学
✓ 已验证
DOI
高影响因子
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