RSC Advances
·
2017
·Vol. 7
·期 54
·34096-34103
·
IF 3.108
Yuehan Su,Ping Chen,Fengliang Wang,Qianxin Zhang,Tiansheng Chen,Yingfei Wang,Kun Yao,Wenying Lv,Guoguang Liu
A novel visible-light-driven carbon dot (CDs)/TiO2/g-C3N4 photocatalyst was successfully synthesized by doping CDs in TiO2 nanoparticles and the surface of g-C3N4 nanosheets via a facile hydrothermal process and was confirmed by characterization methods. UV-vis diffuse reflectance spectra (DRS) revealed that CDs/TiO2/g-C3N4 showed obvious additional absorption in the 370–450 nm region. DMPO spin-trapping ESR spectra demonstrated the existence of O2˙− and ·OH. The photocatalytic activity of the CDs (1.0 wt%)/TiO2/g-C3N4 was remarkably enhanced as compared to that of the single components (TiO2 and g-C3N4) and double component (TiO2/g-C3N4) towards the degradation of enrofloxacin (ENX) under visible-light irradiation. About 91.6% of ENX was decomposed by CDs (1.0 wt%)/TiO2/g-C3N4 in 1 h, which is nearly 3.95 times, 4.82 times, and 1.69 times that for TiO2, g-C3N4, and TiO2 (90.0 wt%)/g-C3N4, respectively. Scavenging experiments revealed that O2˙− and ·OH played key roles during the photocatalytic degradation of ENX. This study provides a simple and convenient method to modify materials with enhanced photocatalytic performance, and the CDs/TiO2/g-C3N4 catalyst is efficient, stable, and reusable for environmental practical applications.
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高影响因子
JOURNAL OF HAZARDOUS MATERIALS
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2024
·
IF 12.2
Hongshan Jia,Yingqing Zhan,Fei Zhu,Ximin Chen,Xinyue Duan,Ning Zhang,Jie Liu,Yinlong Li
Nano-structured hydrogel with unique anti-oil fouling property exhibits big advantage in oil/water separation, but its application in complex oily wastewater (contain oils, organic matter, bacteria, etc.) cleanup is hampered by the insufficient capabilities in multi-antifouling and synergistic treatment. Herein, we constructed the amino-rich NH 2 -AgBiS 2 /PANI (polyaniline)-g-C 3 N 4 based multi-functional hydrogel functional layer onto the polyacrylonitrile (PAN) fiber membrane via polyphenol-mediated chitosan gelation and vacuum-assisted self-assembly techniques. The unique honeycomb-like structure and super-wetting feature synergistically contributed to the powerful oil resistance and flux breakthrough of composite membrane. Such membrane achieved superior permeability (up to 3558 L −1 m −2 h −1 ) for various SDS-stabilized oil-in-water emulsions and remarkable synergistic treatment efficiency of multicomponent pollutant-oil-water emulsion. The rational design of hydrogel layer on membrane surface intensified the photo-response ability and multiple electron transport channels, which offered the favorable photocatalytic self-cleaning performance towards degradation of organic dyes. According to the free radical quenching and EPR experiments, the photocatalytic mechanism was proposed. In addition, the inhibition rate of E. coli could reach 100 % under illumination of 24 h. Therefore, the integration of ultra-low oil adhesion, photocatalytic self-cleaning, and antibacterial features endows membrane with exceptional multiple anti-fouling performance, exhibiting unique advantages over traditional membranes in handling complex membrane fouling issues.
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PubMed
高影响因子
Surfaces and Interfaces
·
2024
·
IF 5.7
Guangyu Wu,Guoyu Tai,Geng Li,Jiahuali Lu,Yuwei Pan,Jiangang Han,Weinan Xing
Perylene diimide (PDI) organic material and its derivatives as photocatalysts possesses excellent charge separation efficiency and are renowned as among the top n-type organic semiconductors capable of absorbing visible light owing to their narrow band gap (∼1.69 eV). Heterojunction photocatalysts with efficient electron transfer and excellent photocatalytic performance are of great significance for the degradation of organic compounds in the environment. In this work, a series of heterojunction catalysts (CNPDI) with robust interfacial charge transfer via π-π interaction were prepared using g-C 3 N 4 and different mass ratio of the self-assembled PDI as precursors, subsequently utilized as efficient visible-light-driven photocatalysts for the degradation of organic tetracycline. SEM and TEM results indicated that porous CN was completely wrapped around PDI nanorod structure formed by strong π-π interactions. In the presence of activating potassium peroxymonosulfate (PMS) substances, the kinetic rate constant of the CNPDI photocatalytic system clocked in at 0.026 min −1 , marking 2.36 fold increase compared to the original CN (0.011 min −1 ). The bolstered degradation performance was attributed to the built-in potential formed by the self-assembled PDI and CN, promoting the separation of electron-hole pairs and redistribution of charge density in the interface region. This work presents a useful insight into the crafting of PDI-based heterojunction photocatalysts for degradation environmental pharmaceutical pollutants.
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高影响因子
Journal of Water Process Engineering
·
2024
·
IF 6.3
Yi Duan,Miaobin Ye,Ye Zou,Haiyan Jiang,Shuai Zhou,Pingli Cai
In this work, cobalt-doped graphitic carbon nitride (Co-CN) was synthesized through a high-temperature calcination method and employed to activate peroxymonosulfate (PMS) for ciprofloxacin (CIP) removal. The experimental outcomes demonstrated that under optimized conditions of 0.5 g/L 0.25Co-CN, 2 mM PMS, an initial solution pH of 7, an initial CIP concentration of 5 mg/L, and at a temperature of 30 °C, the removal efficiency of CIP can reach 99.5 % within 45 min. The kinetics of CIP removal by Co-CN activated PMS are accurately modeled by a bi-exponential decay function, indicating a CIP removal process involving both rapid and slower reaction phases. Furthermore, after five cycles of reuse, the catalyst maintained a respectable removal efficiency of 83.3 % for CIP, with pre- and post-reaction characterizations affirming the excellent reusability and stability of 0.25Co-CN. Quenching experiments and Electron Paramagnetic Resonance (EPR) tests confirmed the predominance role of 1 O 2 in the catalytic degradation mechanism. The Co N 4 active sites within 0.25Co-CN were identified as crucial for adsorption and subsequent degradation of CIP. In this study, a novel kinetics model is proposed for fitting the CIP removal process under the synergistic effect of adsorption and catalysis, which provides new insights into the understanding of the dynamic process of organic pollutant removal.
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高影响因子
Materials Today Energy
·
2021
·
IF 7.311
W.-W. Liu,Y.-C. Liu,C.-Y. Cui,S.-T. Niu,W.-J. Niu,M.-C. Liu,M.-J. Liu,B. Gu,L.-Y. Zhang,K. Zhao,F. Ran,Y.-L. Chueh
Fast extraction of photo-generated charge plays a crucial function in improving the photovoltaic conversion efficiency (PCE) of the perovskite solar cells (PSCs). Here, an effective strategy to decrease the charge recombination losses by introducing versatile carbon nitride ( g -C 3 N 4 ) nanosheets to the CsPbBr 3 films was demonstrated. The incorporation of the g -C 3 N 4 additive can restrain the nucleation and crystalline growth rate of perovskite films by an interaction of lone pair electrons from the exposed N atoms to the PbBr 2 precursor, resulting in high-quality CsPbBr 3 films with an increase in crystalline size. Notably, a ‘coupling effect’ between the lone pair electrons from g -C 3 N 4 nanosheets and unsaturated Pb dangling bonds (Br vacancies) around the grain boundaries significantly decreases trap states caused by defects, leading to the fewer recombination centers in CsPbBr 3 films. The g -C 3 N 4 nanosheets serving as an energy barrier can also successfully suppress the recombination loss of back electrons with holes from the g -C 3 N 4 interface, yielding a superior PCE of 8.0% with a fill factor of 80.25%. The result opens an alternative path to enhance the performance of CsPbBr 3 PSCs by passivating the trap states of perovskite films with the improvement of the crystallization quality and charge extraction efficiency.
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高影响因子
Journal of Materials Chemistry A
·
2019
·Vol. 7
·期 12
·6939-6945
·
IF 10.733
Fu Zhang,Jihua Zhang,Jianming Li,Xu Jin,Yapeng Li,Min Wu,Xiongwu Kang,Tao Hu,Xiaoqi Wang,Wei Ren,Genqiang Zhang
Transition metal phosphide (TMP) co-catalysts have been widely applied to modify graphitic carbon nitride (g-C3N4) for improving the photocatalytic activity, but it is still a great challenge to fabricate high performance and stable g-C3N4 based photocatalysts decorated with TMP co-catalysts by simple approaches. Herein, we report a facile and general strategy for the synthesis of TMP/g-C3N4 hybrid photocatalysts with high H2 production performance under visible light irradiation. Among the as-prepared TMP/g-C3N4 hybrids, the CoP/g-C3N4 sample with an optimum mass content of 2.5 wt% delivers the highest photocatalytic H2 evolution rate of 956.8 μmol g−1 h−1. DFT calculations and experimental results reveal that the superior catalytic activity could be predominantly attributed to the larger number of active sites and the enhanced photo-excited charge transfer dynamics benefitting from the synergistic effect of the ultrasmall particle size and the intimate contact interface between g-C3N4 and CoP. We anticipate that the protocol would provide a promising strategy for designing TMP co-catalyst based hybrid nanostructures aiming to optimize photocatalytic hydrogen generation efficiency.
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高影响因子
JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
·
2022
·Vol. 97
·期 5
·1326-1335
·
IF 3.709
Dandan You,Ming Li,Zhuren Pan,Zhenyang Yin,Ning Wang
BACKGROUND 2,4-Dichlorophenol (2,4-DCP) is widely used as a preservative, pesticide, germicide, etc. However, it is very damaging to organisms and the environment, and it is difficult to decompose because of its high stability. To improve the photocatalytic ability of photocatalysts for degrading hazardous substances, like 2,4-DCP, constructing heterojunction is an effective strategy because of its restraint of electron–hole recombination and extension of light absorption spectra. RESULTS A novel photocatalyst Bi 7 O 9 I 3 /BiOIO 3 /g-C 3 N 4 was successfully synthesized by one-step in-situ co-crystallization method. The formation of Bi 7 O 9 I 3 /BiOIO 3 /g-C 3 N 4 composite was confirmed by X-ray diffractometer (XRD), X-ray photoelectron spectroscopy (XPS), fourier transform infrared spectrometer (FTIR spectrometer) and transmission electron microscope (TEM). The obtained optimal composite exhibited an excellent photocatalytic performance of degrading 2,4-DCP with an efficiency of 95% under visible-light irradiation. The trapping experiments indicated that superoxide radicals, electrons, and singlet oxygen played vital roles in 2,4-DCP decomposition and confirmed the dual Z-scheme heterojunction structure of Bi 7 O 9 I 3 /BiOIO 3 /g-C 3 N 4 . Furthermore, the possible reaction pathway was deduced based on the trapping experiments and the intermediate products detected by liquid chromatography tandem mass spectrometry. CONCLUSION The photocatalytic performance of Bi 7 O 9 I 3 /BiOIO 3 /g-C 3 N 4 was enhanced because the more efficient separation and transfer of photogenerated charge carriers was achieved due to the formation of dual Z-scheme heterojunction. This work presented a simple and feasible synthesis method to prepare a ternary photocatalyst for improving the photocatalytic ability, and it can assist in further understanding the reaction mechanism of 2,4-DCP degradation. © 2022 Society of Chemical Industry (SCI).
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DIAMOND AND RELATED MATERIALS
·
2021
·
IF 3.315
Wei Jiang,Pinghua Chen,Xueqin Li,Guanghui Wu,Huitao Zheng,Chenxuan Li,Lei Fang,Hualin Jiang
Electrochemical analysis using specifically designed electrodes represents a promising strategy to detect organic pollutants, such as 4-nitrophenol (4-NP), in the environment. Towards this goal, a metal-free composite of phenanthroline doped graphitic carbon nitride (g-C 3 N 4 -PD) was synthesized, characterized, and applied as the electrode materials for electrochemical detection of 4-NP in water. The phenanthroline doping simultaneously extends the π-conjugation system of g-C 3 N 4 , and creates defect sites in g-C 3 N 4 , leading to better conductivity, higher 4-NP adsorption, and significantly enhanced electrocatalytic activity . Electrochemical sensors were fabricated by using g-C 3 N 4 -PD-modified carbon electrode. They showed a broad detection concentration range of 2.854–1117 μM and a low detection limit of 39 nM for 4-NP, with high reproducibility, stability and selectivity . Reliable and accurate measurements of 4-NP in real-life water samples have been demonstrated using these electrodes.
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高影响因子
BIOSENSORS & BIOELECTRONICS
·
2019
·
IF 9.518
Jinglong Fang,Guanhui Zhao,Xue Dong,Xuan Li,Juncong Miao,Qin Wei,Wei Cao
An electrochemiluminescence (ECL) analytical platform was proposed for ultrasensitive detection of amyloid-β proteins (Aβ) based on the ECL resonance energy transfer (ECL-RET). In this work, gold nanoparticles-functionalized graphitic carbon nitride nanosheets (g-C 3 N 4 @Au NPs) and palladium nanoparticles-coated Metal organic framework (Pd NPs@NH 2 -MIL-53) were synthesized, which were as ECL donor and ECL acceptor respectively. A strong cathode ECL emission was obtained from the g-C 3 N 4 @Au NPs when used K 2 S 2 O 8 as its co-reactant. Here, Au NPs not only was used as an accelerator to enhance and stabilize the ECL signal, but also a connector for attaching Aβ antibody. In addition, NH 2 -MIL-53(Al) was selected as a label material for supporting Pd NPs to synergistically increase the intensity and range of UV-visible absorption. The ECL signal of g-C 3 N 4 @Au NPs was intensely decreased when the ECL acceptor probe Pd NPs@NH 2 -MIL-53 was incubated onto the modified GCE by way of the specific recognition. Under the optimal condition, a wide detection range from 10 fg/mL to 50 ng/mL and a low detection limit of 3.4 fg/mL (S/N = 3) were obtained. In consideration of favorable specificity, stability and reproducibility, the proposed method was successfully applied for Aβ detection in actual human serum samples and could be a potential analytical tool for sensitive molecular trace detection in clinical analysis.
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高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2020
·
IF 7.489
Yingying Qin,Jian Lu,Fanying Meng,Xinyu Lin,Yonghai Feng,Yongsheng Yan,Minjia Meng
Effectively separating photo-generated charge carriers is usually important but difficult for the high-activity photocatalysis. Fabricating 2D/2D Schottky-Ohmic junction is more beneficial to the spatial separation and transfer of photo-induced charges at the interface of different components due to the matching of distinct two-dimension structure and band alignment, but the manipulation and mastery of junction type (Schottky-Ohmic junction and Z-scheme junction) and electronic structure is an arduous task for preparing satisfactory photocatalysts and investigating the PHE mechanism. In this work, the 2D/2D WO 3 /Pt/ g -C 3 N 4 (WPC) Schottky-Ohmic junction composite photocatalysts is formed via facile hydrothermal and photo-induced deposition method for employing to produce H 2 . The optimized WPC Schottky-Ohmic junction photocatalyst exhibits remarkable photocatalytic H 2 -release performance with ability to produce the amount of H 2 reaches 1299.4 μmol upon exposure to visible light, which is about 1.2 and 11.5 times higher than that of WO 3 / g -C 3 N 4 /Pt (WCP) (1119.4 μmol) and pure CN (113.2 μmol)), respectively. This remarkable enhancement of photocatalytic performance is ascribed to: (i) Schottky-Ohmic junction can strikingly expedite spatial charge separation and elongate electron lifetime, (ii) the 2D/2D structure can shorten the charge transportation distance, (iii) Pt with rich electron density can stably adsorb H + . This work provides a successful paradigm for future fundamental research, and exquisitely designs ideal g -C 3 N 4 -based photocatalysts by simultaneously adjusting and optimizing material structure and electronic dynamics.
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高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2017
·
IF 9.446
Kai Wei,Kexin Li,Liushui Yan,Shenglian Luo,Huiqin Guo,Yuhua Dai,Xubiao Luo
In this paper, graphitic carbon nitride nanosheets/titanium dioxide hollow microspheres heterojunctions (g-C 3 N 4 NSs/TiO 2 HMSs) with excellent photocatalytic activity were successfully fabricated by a simple one-step synthesis strategy in the assistance of hydrothermal carbon microspheres. Hydrothermal carbon microspheres act as both dispersant and structure-directing agent for the simultaneous construction of graphitic carbon nitride nanosheets and titanium dioxide hollow microspheres. The synergistic photocatalytic effects in the 4-fluorophenol/hexavalent chromium [4-FP/Cr(VI)] and hexavalent chromium/trivalent arsenic [Cr(VI)/As(III)] multi-component composite pollution systems were studied by using as-prepared g-C 3 N 4 NSs/TiO 2 HMSs under different pH conditions. Interestingly, the efficiencies of 4-FP degradation, Cr(VI) reduction, and As(III) oxidation were simultaneously improved in the 4-FP/Cr(VI) and Cr(VI)/As(III) multi-component synergistic photocatalytic systems relative to the single-component photocatalytic systems. The synergistic photocatalytic mechanisms in the 4-FP/Cr(VI) and Cr(VI)/As(III) multi-component synergistic photocatalytic systems were systematically discussed.
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高影响因子
APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Quanfeng Xing,Min Zhang,Xiuquan Xu,Bo Zhang,Yun Duan,Yi Wei,Jiahui Wang,Mingyang Li
Previous studies have proved that the promoted interactions with bacteria was closely responsible for the improved inactivation efficiency of photocatalysts. Herein, for the first time, the cationic polymer polyethyleneimine (PEI) grafted O-doped g-C 3 N 4 (denoted as PEI/OCN) was successfully fabricated by combination one-pot thermal-polymerization and subsequent covalent cross-linking reaction. Benefiting from the synergistic effect of O-doping and PEI-grafting, the obtained PEI/OCN possessed an extended and intensive visible light response, accelerated photogenerated charge transport, good hydrophilicity as well as enough electrostatic adhesion to bacteria. As a result, PEI/OCN exhibited a dramatically boosted reactive oxygen species (ROS) generation and outstanding rapid photocatalytic bactericidal capability, achieving 7.0 log CFU mL −1 inactivation efficiency of Escherichia coli ( E. coli ) within 30 min visible light exposure. Radical trapping and electron spin resonance (ESR) experiments revealed that superoxide radicals ( • O 2 − ) were crucially dominated the superior photocatalytic disinfection activity. Overall, the presented work provided a rationally designing of novel metal-free g-C 3 N 4 -based photocatalysts for efficient elimination of bacterial contaminations.
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高影响因子
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