NEW JOURNAL OF CHEMISTRY
·
2023
·
IF 3.3
Bo Wang,Lianfeng Wu,Ao Sun,Tengfei Liu,Lifang Sun,Wen Li
In this study, a Cu2O/g-C3N4 nanocomposite was prepared through in situ growth of Cu2O nanoparticles on g-C3N4 nanosheets. Subsequently, the antibacterial activities of Cu2O, g-C3N4 and Cu2O/g-C3N4 composites against Staphylococcus aureus and Pseudomonas aeruginosa were studied, respectively. The results show that the minimum bacteriostatic concentration of the composite is significantly smaller than that of Cu2O and g-C3N4 alone, and it also has better long-term bacteriostatic effect. The bacteriostatic effect of the prepared Cu2O/g-C3N4 nanocomposites is further enhanced by visible light irradiation. The first-principles calculation based on density functional theory (DFT) was used to obtain the work function of the composite materials. The Cu2O/g-C3N4 composite has a work function that is significantly lower than that of Cu2O and g-C3N4. The lower work function is beneficial to the separation of electrons and holes and the formation of reactive oxygen species (ROS) on the surface of the material, further reducing photocorrosion. This also explains the reason why the composite material has high bacteriostatic efficiency and better bacteriostatic effect. In addition, the calculation of the differential charge shows that the Cu atom near the heterojunction interface has a strong positive charge, which makes it more difficult to cause redox reactions and enhances the long-acting effect of the bacteriostatic agent. Therefore, based on our experimental and theoretical calculation results, the Cu2O/g-C3N4 composite has a broad application prospect in the field of photocatalytic bacteriostasis.
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RADIATION PHYSICS AND CHEMISTRY
·
2023
·
IF 2.9
Junhui He,Qi Ye,Yi Zhu,Miao Yang,Long Zhao
In this study, the degradation of ciprofloxacin (CIP) was investigated in the synergetic system of electron beam irradiation (EBI) combined with graphite carbon nitride/carbon nanodots (g-C 3 N 4 /CDs). The results suggested that the presence of g-C 3 N 4 /CDs could not only promote the degradation of CIP but also significantly enhanced the mineralization ratio. At 25 kGy, the mineralization ratio increased from 18.1% to 69.0% while g-C 3 N 4 /CDs was added. Regeneration experiments revealed that the g-C 3 N 4 /CDs composite possessed good reusability. In addition to finding that the presence of CO 3 2− , HCO 3 − , NO 3 − and NO 2 − obviously restrained the radiolysis process of CIP, the adding of Cl − and SO 4 2− could also have slight inhibitory effects. The effect of various water matrices in EBI&g-C 3 N 4 /CDs systems suggested that the degradation efficiency decreased in lake and tap water. Moreover, the studies in the presence of different radical scavengers suggested that ·OH was the main reactive species in the degradation process. The possible degradation pathway of CIP was proposed in the light of intermediate products using Liquid chromatograph-mass spectrometer (LC–MS) analysis coupled with DFT calculations.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Xu Tang,Wenjing Shen,Dongyi Li,Binrong Li,Yemei Wang,Xianghai Song,Zhi Zhu,Pengwei Huo
The novel Co-doping combined with mesoporous g-C 3 N 4 -based photocatalyst was constructed, and the Co-CN showed impressive photocatalytic reduction CO 2 activity. Employing the DFT computation, we discussed the possible Co doping sites on g-C 3 N 4 framework, as well as the effects of band gaps, optical properties , and various densities of state (DOS) on photocatalytic activity. The adsorption energy calculation proved that the substitution and interstitial doping Co atoms in g-C 3 N 4 crystal unit cell was the stable configuration. The coexistence substitution and substitution the monolayer g-C 3 N 4 showed serious deformation. It indicated that the introduction of Co atoms leads g-C 3 N 4 molecular orbital redistribution and Co tends to occupy the conduction band, due to its weak electronegativity. Moreover, the DFT and experiment results pointed out that the doped-Co narrowed g-C 3 N 4 bandgap and increased light absorption from 450 to 800 nm, the improved charge carrier separation efficiency was originated from Co atom the unfilled 4 f and the empty 5d orbital act as electron capturing center. This research indicates the availability of transition metal g-C 3 N 4 with conducive photocatalytic activity.
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RSC Advances
·
2023
·Vol. 13
·期 9
·5957-5969
·
IF 3.9
Dai Yongheng,Yuan Huayu,Li Jiang,Su Qi,Yi Qianwen,Zhang Yuntao
The construction of direct Z-scheme heterojunctions with high photocatalytic degradation ability is important for wastewater treatment, but there are still many unsolved challenges. In this article, we report the fabrication of a Z-scheme P–TiO2/g-C3N4 (CNPT-X) heterostructure by the calcination method. Under simulated sunlight, CNPT-X composites are found to show excellent degradation performance against sulfonamide antibiotics sulfadiazine (SD), sulfamethazine (SM2), sulfamonomethoxine (SMM), and sulfamethoxazole (SMZ). CNPT-3 (400 mg L−1) can be used to degrade four sulfa antibiotics within 90 min, with a degradation rate as high as 99%, which is higher than that for P–TiO2 and g-C3N4 alone. The internal electron transfer paths and mechanisms for the composites are revealed by ESR radical detection experiments, XPS energy spectrum shifts, valence band positions and active material quenching experiments. Furthermore, the degradation products are analyzed by GC-MS, and four possible degradation pathways for sulfonamide pollutants are proposed. This photocatalyst provides new insights into the fundamental aspects of the photocatalytic degradation mechanism for composite pollutants, as well as new ideas for practical environmental applications.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2019
·
IF 14.229
Tianhong Xu,Rongjiang Zou,Xiaofang Lei,Xuemei Qi,Qiang Wu,Weifeng Yao,Qunjie Xu
Photocatalysis is a well-established and green technique for degradation of antibiotics in wastewater. Hydroxyapatite (HAp) has excellent biocompatibility, biological activity, non-toxicity and low cost, and has many applications in biomaterials. Recently, HAp has been reported as an inexpensive green photocatalyst for cleaning some drug contaminations. However, its photocatalytic performance and chemical stability are far from practical applications. In this research, a series of porous hollow hydroxyapatite (HAp) microspheres decorated with small amounts of ultrathin graphitic carbon nitride (g-C 3 N 4 ) were firstly and successfully fabricated by a facile hydrothermal procedure. The experimental results show that as-prepared g-C 3 N 4 /HAp photocatalysts exhibited evidently enhancement on the photocatalytic activities for the degradation of tetracycline (TC), compared with the corresponding ultrathin g-C 3 N 4 and porous hollow HAp microspheres. Notably, g-C 3 N 4 (1.5 wt.%)/HAp composite displayed a net high photocatalytic activity for TC degradation (almost 100% within 15 min). Moreover, the as-prepared g-C 3 N 4 (1.5 wt.%)/HAp exhibited a good stability in the cyclic runs for the photocatalytic degradation of TC, demonstrating its promising potential as an efficient photocatalyst. An optimum decorating amount of ultrathin g-C 3 N 4 onto porous hollow HAp microspheres favors an effective separation of photogenerated electron-hole pairs, which can be responsible for the enhanced photocatalytic performance. In addition, the photocatalytic degradation mechanism for TC was proposed. This fundamental research will provide a promising strategy for the development of highly efficient and compatible photocatalysts with many applications.
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2018
·
IF 3.235
Jie Ma,Xue-Yu Tao,Shi-Xiang Zhou,Xiang-Zhu Song,Lin-Guo,Yao-Wang,Ya-Bo Zhu,Li-Tong Guo,Zhang-Sheng Liu,He-Liang Fan,Xian-Yong Wei
Ag nanoparticles decorated Polyaniline (PANI)/graphitic carbon nitride (g-C 3 N 4 ) composite was fabricated as active electrode materials for supercapacitors via an in-situ oxidative polymerization. Morphology and structure of Ag/PANI/g-C 3 N 4 composite were investigated by scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier transform infrared (FT-IR) and X-ray diffraction (XRD). The supercapacitive behavior of the electrode material was tested in a three electrode system using 1.0 M H 2 SO 4 electrolyte. The results indicated that the Ag/PANI/g-C 3 N 4 composite delivered a high specific capacitance of 797.8 F g −1 and an excellent capacitance retention of 84.43% after 1000 cycles at an applied current density of 1 A g −1 . Ragone plot was derived and compared which showed enhanced supercapacitive performance of Ag/PANI/g-C3N4. The composite should be ideal potential electrode materials for high-performance and effective supercapacitors.
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JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2019
·Vol. 102
·期 9
·5484-5493
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IF 3.094
Changcun Han,Tong Zhang,Qijun Cai,Chonghao Ma,Zhengfu Tong,Zhifeng Liu
In this work, cobalt phosphide (CoP) nanoparticles were successfully decorated on an ultrathin g-C 3 N 4 nanosheet photocatalysts by in situ chemical deposition. The built-in electric field formed by heterojunction interface of the CoP/g-C 3 N 4 composite semiconductor can accelerate the transmission and separation of photogenerated charge-hole pairs and effectively improve the photocatalytic performance. TEM, HRTEM, XPS, and SPV analysis showed that CoP/g-C 3 N 4 formed a stable heterogeneous interface and effectively enhanced photogenerated electron-hole separation. UV-vis DRS analysis showed that the composite had enhanced visible light absorption than pure g-C 3 N 4 and was a visible light driven photocatalyst. In this process, NaH 2 PO 2 and CoCl 2 are used as the source of P and Co, and typical preparation of CoP can be completed within 3 hours. Under visible light irradiation, the optimal H 2 evolution rate of 3.0 mol% CoP/g-C 3 N 4 is about 15.1 μmol h −1 . The photocatalytic activity and stability of the CoP/g-C 3 N 4 materials were evaluated by photocatalytic decomposition of water. The intrinsic relationship between the microstructure of the composite catalyst and the photocatalytic performance was analyzed to reveal the photocatalytic reaction mechanism.
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NANO
·
2019
·
IF 1.293
Xinyao Li,Jinjuan Xue,Shuaishuai Ma,Peng Xu,Chengjuan Huang,Mingxin Wang
A novel heterojunction photocatalyst consisting of three-dimensional (3D) flower-like MgAl LDH and acidified g-C 3 N 4 (CN-H) was first developed by a simple facile coating method. The obtained MgAl LDH/CN-H samples were thoroughly characterized by powder X-ray diffraction (XRD), UV–Vis diffuse reflectance spectroscopy (DRS), scanning electron microscopy (SEM), transmission electron microscopy (TEM), photoluminescence spectroscopy (PL), X-ray photoelectron spectroscopy (XPS), electrochemical impedance spectroscopy (EIS) and Brunauer–Emmett–Teller (BET) analyzer. The detailed results demonstrated that g-C 3 N 4 could transform from a generally two-dimensional layered structure into special cavity-like structure after acid treatment. CN-H increased specific surface to expose more active reaction sites in comparison to pristine g-C 3 N 4 . MgAl LDH and CN-H with matched band gaps were tightly bonded to form heterojunction structure by strong electrostatic intercalation. The combination could obviously boost the separation of photogenerated carriers. The as-prepared MgAl LDH/CN-H exhibited high photocatalytic performance in the degrading on typical antibiotic tetracycline hydrochloride (TC ⋅ HCl), of which degradation rate was 6.5 and even 22 times higher than that of MgAl LDH and pristine g-C 3 N 4 , respectively. The synthesis of MgAl LDH/CN-H heterojunction photocatalyst could have some positive suggestions for the rational construction of new photocatalysts and also has great application prospect in the degradation of environmental pollutants.
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2019
·
IF 3.218
Xueming Dang,Xiufang Zhang,Huimin Zhao
A novel photoelectrochemical (PEC) aptasensor based on the g-C 3 N 4 nanosheets modified WO 3 film with inverse opal photonic crystals (IOPCs) structure was developed. Oxytetracycline (OTC) aptamer was immobilized on the surface of composites through π-π interaction between g-C 3 N 4 and DNA nucleotide. Benefiting from the great optical absorption ability and photo-generated charge separation capacity, the g-C 3 N 4 /WO 3 IOPCs aptasensor exhibited excellent PEC response performance in an electrolyte containing 0.1 M ascorbic Acid (AA). After the recognition and capture of OTC, the configuration change of OTC-aptamer restrained the oxidation of AA by the photogenerated hole on the valance band of g-C 3 N 4 , resulting in photocurrent change. The results showed that the PEC aptasensor possessed a linear detection range from 1 nM to 230 nM and a detection limit of 0.12 nM (≈59.58 ng L −1 ) for the detection of OTC in water. The satisfactory detection results in real sample further revealed the potential of WO 3 IOPCs and its heterostructure for PEC analytical applications, and provided a novel approach for design of PEC platform.
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Energy Technology
·
2019
·Vol. 7
·期 7
·1900017
·
IF 3.163
Zhongyi Du,Pengju Sun,Kuanhuai Wu,Xiarong Zheng,Xingfeng Zhang,Jiale Huang,Daohua Sun,Yanmei Zheng,Qingbiao Li
Graphite carbon nitride (g-C 3 N 4 ) and SiC have drawn increasing attention for application in visible light photocatalytic hydrogen evolution by water splitting due to their unique band structure and high physicochemical stability. Herein, a g-C 3 N 4 -SiC heterojunction with loaded noble metal is constructed. The g-C 3 N 4 -SiC-Pt composite photocatalysts are successfully prepared by the combination method of bio-reduction, sol deposition, and calcination. The layers of g-C 3 N 4 are thinned, and both SiC and Pt nanoparticles are simultaneously tightly bound to g-C 3 N 4 by calcination during the preparation of g-C 3 N 4 -SiC-Pt. The heterojunction formed at the interface of SiC and g-C 3 N 4 enhances the separation efficiency of the photogenerated electron–hole pairs. These composite photocatalysts achieve a high hydrogen evolution rate of 595.3 μmol h −1 g −1 with 1 wt% of deposited Pt, which is 3.7- and 2.07-fold higher than those of g-C 3 N 4 -bulk and g-C 3 N 4 -SiC under visible light irradiation with a quantum efficiency of 2.76% at 420 nm, respectively.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2019
·
IF 14.229
Yong-Jun Yuan,Zhi-Kai Shen,Pei Wang,Zijian Li,Lang Pei,Jiasong Zhong,Zhenguo Ji,Zhen-Tao Yu,Zhigang Zou
Exploiting highly-efficient, broad-spectrum responsive and noble-metal-free water oxidation photocatalyst is a major challenge in the field of photocatalysis. Herein, we tackle this challenge by synthesizing Z-scheme PTCDA/g-C 3 N 4 photocatalysts, which can absorb light with wavelength short than 600 nm, for visible light photocatalytic O 2 production from water. Owing to the evident conduction and valance band energy level difference between PTCDA and g-C 3 N 4 , the PTCDA/g-C 3 N 4 photocatalysts exhibit efficient charge carrier separation through a Z-scheme mechanism, as demonstrated by the transient photocurrent responses and time-resolved fluorescence decay spectra analysis. Benefitting from the synergetic effect of the broad visible light absorption capacity and efficient charge separation, the optimized PTCDA/g-C 3 N 4 photocatalyst shows the highest O 2 evolution rate of 847 μmol·h −1 ·g −1 under visible light irradiation in the presence of Co 3 O 4 as a cocatalyst and AgNO 3 as the sacrificial reagent. An apparent quantum yield of 4.5% was achieved under monochromatic light irradiation at 420 nm.
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ACS Applied Materials & Interfaces
·
2019
·
IF 8.456
Hemdan S. H. Mohamed,Liang Wu,Chao-Fan Li,Zhi-Yi Hu,Jing Liu,Zhao Deng,Li-Hua Chen,Yu Li,Bao-Lian Su
The development of lithium-ion batteries using transition metal oxides has recently become more attractive, due to their higher specific capacities, better rate capability, and high energy densities. Herein, the in situ growth of advanced mesoporous CuO/O-doped g-C3N4 nanospheres is carried out in a two step hydrothermal process at 180 °C and annealing in air at 300 °C. When used as an anode material, the CuO/O-doped g-C3N4 nanospheres achieve a high reversible discharge specific capacity of 738 mAhg–1 and a capacity retention of ∼75.3% after 100 cycles at a current density 100 mAg–1 compared with the pure CuO (412 mAhg–1, 47%) and O-doped g-C3N4 (66 mAhg–1, 53%). Even at high current density 1 Ag–1, they exhibit a reversible discharge specific capacity of 503 mAhg–1 and capacity retention ∼80% over 500 cycles. The excellent electrochemical performance of the CuO/O-doped g-C3N4 nanocomposite is attributed to the following factors: (I) the in situ growing CuO/O-doped g-C3N4 avoids CuO nanoparticle aggregation, leading to the improved lithium ion transfer and electrolyte penetration inside the CuO/O-doped g-C3N4 anode, thus promoting the utilization of CuO; (II) the porous structure provides efficient space for Li+ transfer during the insertion/extraction process to avoid large volume changes; (III) the O-doping g-C3N4 decreases its band gap, ensuring the increased electrical conductivity of CuO/O-doped g-C3N4; and (IV) the strong interaction between CuO and O-doped g-C3N4 ensures the stability of the structure during cycling.
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