OPTICAL MATERIALS
·
2021
·
IF 3.08
Jianhe Tang,Yu Liu,Yitong Lin,Xueke Liu,Liang Chen,Congcong Piao,Dawei Fang,Jun Wang
Photocatalysis technology is an effective way for converting nitrate (NO 3 − ) and sulfite (SO 3 2− ) in wastewater to pollution-free nitrogen (N 2 ) and exploitable ammonium sulfate ((NH 4 ) 2 SO 4 ). In this study, three novel photocatalysts , Z-scheme (Cu,Cu)/g–C 3 N 4 –(Cu,Cu)-WO 3 (002), Z-scheme (Cu,Ag)/g–C 3 N 4 –(Cu,Ag)-WO 3 (002) and Z-scheme (Cu,Ru)/g–C 3 N 4 –(Cu,Ru)-WO 3 (002), were prepared by photo-assisted electrostatic self-assembly method. The prepared photocatalysts are synthetically characterized by XRD , SEM, TEM, EDX , XPS , DRS, PL , TPR and EIS . The effects of different co-catalyst combinations on the activity and selectivity of the photocatalysts are evaluated. Also, the impacts of simulated solar light irradiation time, NO 3 − initial concentration and cycle times on the conversions of NO 3 − and SO 3 2− are studied. The results display that the Z-scheme (Cu,Ag)/g–C 3 N 4 –(Cu,Ag)-WO 3 (002) photocatalyst can selectively convert NO 3 − to N 2 , while the Z-scheme (Cu,Ru)/g–C 3 N 4 –(Cu,Ru)-WO 3 (002) photocatalyst can selectively convert NO 3 − to NH 4 + . Nevertheless, the Z-scheme (Cu,Cu)/g–C 3 N 4 –(Cu,Cu)-WO 3 (002) photocatalyst has hardly selectivity for conversion of NO 3 − . These three photocatalysts all exhibit relatively strong capabilities for converting SO 3 2− to sulfate (SO 4 2− ) due to the existence of the highly active (002) plane of WO 3 . Finally, the possible mechanisms on the photocatalytic conversions of NO 3 − and SO 3 2− caused by Z-scheme (Cu,M)/g–C 3 N 4 –(Cu,M)-WO 3 (002) (M = Cu, Ag and Ru) photocatalysts are proposed.
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DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2017
·
IF 3.387
Liping Zhang,Guohong Wang,Zhenzhong Xiong,Hua Tang,Chuanjia Jiang
A combined hydrothermal-calcination approach is developed to synthesize hierarchical β -Bi 2 O 3 /g-C 3 N 4 direct Z-scheme photocatalyst with enhanced visible light photoactivity for Rhodamine B (RhB) degradation. First, Bi 2 O 2 CO 3 microflowers were hydrothermally prepared using Bi(NO 3 ) 3 ·5H 2 O as feedstocks, and then a series of β -Bi 2 O 3 /g-C 3 N 4 direct Z-scheme photocatalysts were synthesized via a facile calcination method using Bi 2 O 2 CO 3 and g-C 3 N 4 as precursors. The samples were systematically characterized by various characterization technologies including X-ray diffraction, scanning and transmission electron microscopes, Fourier transform infrared spectroscopy and N 2 absorption-desorption equipment. It was found that the g-C 3 N 4 content in the precursors played a key role in affecting the photocatalytic activity of the final products. The β -Bi 2 O 3 /g-C 3 N 4 heterojunction exhibited higher photocatalytic activity than single active components ( β -Bi 2 O 3 and g-C 3 N 4 ), indicating the presence of a synergistic effect between two active components in β -Bi 2 O 3 /g-C 3 N 4 heterojunction. Among all as-prepared catalysts, the 70 wt.% g-C 3 N 4 /Bi 2 O 2 CO 3 exhibits the highest activity for RhB degradation, and the apparent reaction rate constant k (42.2 × 10 −3 min −1 ) is 3.1 and 1.7 times as high as that of pure β -Bi 2 O 3 (13.5 × 10 −3 min −1 ) and g-C 3 N 4 (25.2 × 10 −3 min −1 ), respectively. The enhanced photocatalytic performance of β -Bi 2 O 3 /g-C 3 N 4 heterostructure photocatalysts is mainly due to the high surface area, closely contacted interfaces between the β -Bi 2 O 3 and g-C 3 N 4 component, and the formation of direct Z-scheme structure in the β -Bi 2 O 3 /g-C 3 N 4 composites.
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DOI
高影响因子
NANOTECHNOLOGY
·
2022
·Vol. 34
·期 1
·015713
·
IF 3.953
Zheyuan Liu,Lingfang Qiu,Ke Wen,Banpeng Cao,Ping Li,Yi Tang,Xiangshu Chen,Hidetoshi Kita,Shuwang Duo
Photocatalysts with heterojunction structure have been widely used for organic degradation. In this study, CuS/g-C3N4 heterojunction was formed by in situ self-assembly via a simply hydrothermal method. A series of characterizations were applied to analyzing the morphology, structure, optical properties and photo-induced electron transfer of the samples. The effect of CuS mass ratio in the CuS/g-C3N4 composite on methyl blue (10 mg l−1) degradation under visible-light illumination was discussed. When CuS mass ratio was 60%, CuS/g-C3N4 behaved the highest photocatalytic efficiency which is 17 times higher than that of pure g-C3N4, and the optimal heterojunction exhibited promising photocatalytic stability as well. The synthesized CuS/g-C3N4 with intimate contact and promising photocatalytic performance provides important implications on analogous researches on g-C3N4-based heterojunctions for photocatalytic applications.
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DOI
高影响因子
ACS Applied Energy Materials
·
2021
·
IF 6.024
Jun Zhang,Shuai Shao,Desen Zhou,Tingmin Di,Tielin Wang
Two-dimensional (2D) layered nanocomposite provides a surface-to-surface heterojunction, which is an effective way to improve the photocatalytic performance because larger contact areas can promote the separation rate of interfacial charge carriers. In this study, Co(OH)2/g-C3N4/Ni(OH)2 2D layered photocatalysts have been successfully synthesized through a simple precipitation–hydrothermal method. The composite achieves a high H2-production rate of 899 μmol·h–1·g–1, which exceeds the rate of samples only coupled with Co(OH)2 and Ni(OH)2 by 4.0 and 1.9 times, respectively. In addition, the activity is even higher than that of the optimized Pt-g-C3N4 sample (1 wt. % Pt–C). The characterization results reveal the close contact of g-C3N4 and Ni/Co hydroxides, and such a face-to-face contact can greatly improve the interfacial charge-transfer rate, resulting in a high photocatalytic performance. This work demonstrates a simple way to enhance the photocatalytic H2 production of g-C3N4 under the cooperative effect of Co(OH)2 and Ni(OH)2 and provides novel insights into constructing other 2D ternary heterostructure nanocomposites.
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2018
·
IF 3.057
Minquan Sun,Shuling Shen,Zhujun Wu,Zhihong Tang,Jiaping Shen,Junhe Yang
A novel rice spike-like g-C 3 N 4 /TiO 2 nanowire heterojunctions are fabricated by hydrothermal treating Na 2 Ti 3 O 7 ultralong nanotubes in the presence of g-C 3 N 4 . The presence of g-C 3 N 4 promotes the hydrolysis of Na 2 Ti 3 O 7 ultralong nanotubes. The partially replaced O of TiO 2 by N from g-C 3 N 4 leads to the formation of a tight-binding interface between one dimensional TiO 2 and two dimensional g-C 3 N 4 , which is crucial for fast and effective transfer of photogenerated electrons in heterostructured photocatalysts . As a result, the g-C 3 N 4 /TiO 2 nanowire heterojunctions exhibit excellent visible-light photocatalytic activity. The kinetic constant (k) of g-C 3 N 4 /TiO 2 (0.024 min −1 ) for degradation of methylene blue under visible light irradiation is 1.85 and 4 times than that of pure g-C 3 N 4 and P25, respectively.
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DOI
高影响因子
Journal of the American Chemical Society
·
2017
·
IF 13.858
Shuai Xu,Peng Zhou,Zehui Zhang,Changjun Yang,Bingguang Zhang,Kejian Deng,Steven Bottle,Huaiyong Zhu
Selective oxidation of 5-hydroxymethylfurfural (HMF) to 2,5-furandicarboxylic acid (FDCA) is one of the key reactions for producing chemical commodities from biomass and their derivatives. The challenge for this reaction is to develop an efficient catalytic process that can be conducted under mild conditions (room temperature and atmospheric pressure, using oxygen molecules in air as the oxidant) and a recyclable catalyst. Herein we report a photocatalyst of cobalt thioporphyrazine (CoPz) dispersed on g-C3N4 (abbreviated as CoPz/g-C3N4), which exhibits excellent catalytic activity toward the selective oxidation of HMF into FDCA under simulated sunlight using oxygen molecules in air as a benign oxidant. For example, an FDCA yield of 96.1% in an aqueous solution at pH = 9.18 is achieved at ambient temperature and air pressure. At lower pH (4.01), the product generated is 2,5-diformylfuran. Hence, it is possible to control the reaction outcome by control of the pH of the reaction system. g-C3N4 itself is not a suitable catalyst for the selective oxidation because under the experimental conditions g-C3N4 generates hydroxyl radicals that initiate processes that oxidize HMF directly to CO2 and H2O. CoPz on the other hand activates O2 to give singlet oxygen (1O2), which more controllably oxidizes HMF to FDCA albeit at a more moderate yield (36.2%). The strong interaction between the CoPz and g-C3N4 in the CoPz/g-C3N4 catalyst is experimentally evidenced, which not only improves accessibility of the CoPz sites and makes the catalyst recyclable but also disables the hydroxyl radical generation by g-C3N4 and promotes 1O2 generation on the CoPz sites, significantly enhancing the catalytic performance. This study demonstrates the potential for efficient non-noble metal photocatalysts for organic transformations driven by sunlight.
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DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2019
·
IF 6.361
Yi Xiao,Xueqin Tao,Ganhua Qiu,Zhifeng Dai,Peng Gao,Benxia Li
Constructing Z-scheme photocatalysts is an effective approach to enhance the conversion efficiency of solar to chemical energy. Herein, W 18 O 49 /g-C 3 N 4 heterostructures have been synthesized by growing W 18 O 49 ultrathin nanowires on g-C 3 N 4 nanosheets via a convenient solvothermal process. Various characterizations were performed on the materials to understand the structure-performance relationship. The photocatalytic properties of the W 18 O 49 /g-C 3 N 4 heterostructures were evaluated by the two oxidation reactions, phenol degradation and oxidative N C coupling of benzylamines , under a simulated sunlight (360 ≤ λ ≤ 780 nm). With tuning the W 18 O 49 /g-C 3 N 4 mass ratio, the optimal photocatalyst of W 18 O 49 (30)/g-C 3 N 4 containing 30 wt% W 18 O 49 nanowires exhibited the highest activity in both the photocatalytic reactions. The generations and contributions of the active species in the photocatalytic reactions were identified by electron spin resonance (ESR) spectra and active-species-eliminating experiments. Accordingly, the photocatalytic mechanism of W 18 O 49 /g-C 3 N 4 heterostructures has been expounded based on the direct Z-scheme electron transfer between the two semiconductors as well as the synergistic actions of active sites on W 18 O 49 nanowires and g-C 3 N 4 nanosheets . This work demonstrates a rational paradigm to construct 1D/2D semiconductor heterostructures and provides further insights into Z-scheme photocatalytic mechanism for boosting solar-driven pollutant degradation and organic transformation.
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DOI
高影响因子
ENERGY
·
2020
·
IF 6.082
Ming Su,Haiping Hu,Jianchang Gan,Wenhua Ye,Wenhua Zhang,Huihu Wang
Real-time hydrogen production at low temperature can effectively solve the problem of hydrogen storage and transportation in cold area and plateau region . In this study, a novel Al alloy/NaCl/g-C 3 N 4 composite with enhanced low temperature reactivity for hydrogen production has been synthesized by mechanical ball milling method. The feasibility of Al-water reaction at the temperature of 253.15–373.15 K was firstly proved by thermodynamic calculation . The hydrogen generation performance was studied in tap water at 298.15 K and 23 wt% NaCl aqueous solution at low temperature of 253.15–273.15 K. The results indicated that the addition of g-C 3 N 4 can effectively promoted the hydrolysis of activated Al composites. Hydrogen yield of Al alloy/NaCl/g-C 3 N 4 composite with 1 g of g-C 3 N 4 addition reached 1006 mL·gAl −1 and the induction time of reaction was 90 s at 253.15 K, while that of Al alloy was only 230 mL·gAl −1 and 1120s respectively. It was supposed that the addition of g-C 3 N 4 effectively reduced the size of NaCl particles and promoted their uniform distribution in Al matrix and more cracks were generated. The kinetics and reaction mechanism using Al alloy/NaCl/g-C 3 N 4 composite were discussed. This study provides a new idea for the synthesis of Al composites with high reactivity at low temperature.
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DOI
高影响因子
CHEMOSPHERE
·
2020
·
IF 5.778
Ahmad Beyhaqi,Qingyi Zeng,Sheng Chang,Mingqi Wang,Seyed Mohammad Taghi Azimi,Chun Hu
Graphitic carbon nitride (g-C 3 N 4 ) has enormous potentials for photocatalysis , yet it only possesses moderate activity because of excitonic effects and sluggish charge transfer. Here, we develop a novel two-dimensional g-C 3 N 4 /WO 3 /MoS 2 (CWM) ternary nanocomposite through a facile co-calcination and a hydrothermal process to reach a highly-efficient photocatalyst for organic pollutant elimination under visible light. The WO 3 and MoS 2 nanoparticles were dispersed on the ultra-thin g-C 3 N 4 nanosheets, in which the electronegative g-C 3 N 4 facilitates formation of oxygen vacancies in WO 3 . Compared to pure g-C 3 N 4 , WO 3 , and binary composites, CWM exhibited higher photocatalytic activities for various organic pollutants removal under visible light irradiation. For instance, the CWM showed a removal ratio of ∼99% for RhB after only 10 min irradiation of visible light (λ > 420 nm) and nearly 100% for ciprofloxacin after 2 h of operation. The results showed that OH radicals are the main active species for organic degradation , which suggests a direct Z-scheme heterojunction in CWM that improved spatial separation of charge carries. Furthermore, the collection of electrons is significantly enhanced by MoS 2 for oxygen reduction reaction, and the increased oxygen vacancies of WO 3 further enhanced the separation of electron-hole pairs; therefore, it led to an effective suppression of charge carriers recombination. The above synergistic effects of ternary photocatalyst result in higher photocatalytic oxidation performance for wastewater treatment compared with pure WO 3 , g-C 3 N 4 and their binary composites.
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DOI
高影响因子
MICROCHIMICA ACTA
·
2024
·Vol. 191
·期 11
·1-11
·
IF 5.3
Huang Ziyu,Yang Guangwei,Deng Qiuling,Zhang Xuhui,Wei Xiaoping,Li Jianping
Methidathion (MTDT), a common organophosphorus pesticide with high insecticidal activity, is widely used for pest control. However, the misuse of MTDT leads to widespread residues and endangers human health. Therefore, it is crucial to develop a simple and highly sensitive method for the detection of MTDT residues. Herein, ZIF-90/MnO 2 /g-C 3 N 4 /Fe 3 O 4 composite particles were synthesized: The MnO 2 nanosheets could absorb the energy of the excited g-C 3 N 4 to quench the ECL of g-C 3 N 4 while ZIF-90 acted as a mimetic enzyme to catalyze the formation of thiocholine from MTDT. The thiocholine caused the reduction of MnO 2 to Mn 2+ , restoring the ECL signal of g-C 3 N 4 . Combined with molecular imprinting technique, an electrochemiluminescence sensor was constructed for the determination of MTDT. The determination range was 1.00 × 10 –9 ~ 7.00 × 10 –7 g/L, and the detection limit was 6.58 × 10 –10 g/L. Structurally similar organophosphorus pesticides showed no cross-reactivity. The method has high sensitivity and specificity, and has been successfully applied to the determination of MTDT residue in fruits with recoveries in the range 93.75% ~ 102.37%. Graphical abstract
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DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Yan Zhuang,Shuang Meng,Xue Yang,Dongxuan Guo,Dantong Zhang,Tai Peng,Yue Li,Jinlong Li
The formation of amorphous-crystalline heterojunctions has been recognized as an exceptionally effective strategy for enhancing the separation and transfer of photogenerated charge carriers, thereby improving photocatalytic efficiency. In this study, amorphous-crystalline MoS 2 /g-C 3 N 4 /Co 3 O 4 ternary heterojunctions with a unique flower-like structure were synthesized via the integration of g-C 3 N 4 nanosheets and amorphous MoS 2 onto Co 3 O 4 microspheres with a floral structure using a simple solvothermal method followed by acid treatment. Density functional theory (DFT) calculations revealed that the unique floral morphology, combined with the formation of amorphous-crystalline heterojunctions, facilitates the efficient transfer of photogenerated carriers while simultaneously suppressing the recombination of electron-hole pairs. The optimized MoS 2 /g-C 3 N 4 /Co 3 O 4 (3 %) heterojunction exhibited remarkable photocatalytic performance, achieving 82.1 % degradation of Rhodamine B (5 mg L −1 ) under visible-light irradiation within 90 min. Furthermore, the photocatalyst exhibited excellent stability and reusability, as confirmed through cycling experiments, and efficiently decomposed Rhodamine B and its intermediates into small, non-toxic molecules. This work highlights the successful development of a highly active, recyclable amorphous-crystalline ternary heterojunction with a flower-like structure, providing a novel and efficient strategy for the visible-light-driven removal of organic pollutants.
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产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Yanping Zhao,Xuxia Shai,Qihang Zhou,Kaiyuan Shen
Developing exhaled acetone sensors with high performance can be effectively applied to the medical diagnosis and the health monitoring. Herein, a two-dimensional (2D) layered graphitic carbon nitride (g-C 3 N 4 ) with tunable electronic structure, abundant edge sites, and high stability is proposed, and it is further coupled with stannic oxide (SnO 2 ) by one-step hydrothermal approach to construct a Mott-Schottky heterostructure with layered nanorods array. The exceptional response of the as-fabricated g-C 3 N 4 /SnO 2 gas sensor to 50 ppm acetone at 100 °C is four times higher than that of the pristine SnO 2 sensor. Additionally, the g-C 3 N 4 /SnO 2 sensor's remarkable selectivity, long-term stability against acetone gas, and detection limit of 250 ppb are exhibited. The unique hierarchical design and the Mott-Schottky heterostructure creation which validated by electrochemical study, may be in charge of the enhanced acetone sensing capabilities of g-C 3 N 4 /SnO 2 gas sensor. This work will provide a concise and effective avenue to construct hierarchical composite with Mott-Schottky heterostructure for high-performance acetone gas sensor.
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高影响因子
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