JOURNAL OF PHYSICS D-APPLIED PHYSICS
·
2022
·Vol. 55
·期 43
·434005
·
IF 3.409
Yang Li,Yue Lu,Xiaofang Jia,Zhaoyu Ma,Junying Zhang
Graphitic carbon nitride (g-C3N4) is a photocatalytic semiconductor with great potential for application, whereas, its photocatalytic activity is limited by the high re-combination rate of photo-generated electrons and holes. Here, we load two-dimensional (2D) WO3 nanosheets on the surface of one-dimensional (1D) g-C3N4 porous nanotubes to form a Z-scheme heterojunction. The built-in electric field at the interface of the heterojunction is conducive to promoting electrons transfer from the conduction band of WO3 to the valence band of g-C3N4 and therein combine with the holes. This inhibits electron–hole re-combination in g-C3N4 and WO3, and thus retains the high redox potential of the photo-generated charge-carriers. Therefore, the 2D/1D WO3/g-C3N4 heterojunction shows excellent photocatalytic hydrogen production and Rhodamine B degradation activities. Under simulated sunlight, photocatalytic hydrogen production rate of the WO3/g-C3N4 heterojunction reaches 7.78 mmol g−1 h−1, 2.7 times that of the single g-C3N4 porous nanotubes.
✓ 已验证
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2014
·
IF 6.007
Shifu Chen,Yingfei Hu,Sugang Meng,Xianliang Fu
The separation mechanisms of photogenerated electrons and holes for composite photocatalysts have been a research focus. In this paper, the composite g-C 3 N 4 -WO 3 photocatalysts with different main parts of C 3 N 4 or WO 3 were prepared by ball milling and heat treatment methods. The photocatalytic performance was evaluated by degradation of methylene blue (MB) and fuchsin (BF) under visible light illumination. The photocatalyst was characterized by X-ray powder diffraction (XRD), UV–vis diffuse reflection spectroscopy (DRS), transmission electron microscopy (TEM) and Brunauer–Emmett–Teller (BET) methods. The separation mechanisms of photogenerated electrons and holes of the g-C 3 N 4 -WO 3 photocatalysts were investigated by electron spin resonance technology (ESR), photoluminescence technique (PL), and determination of reactive species in the photocatalytic reactions. When the main part of the g-C 3 N 4 -WO 3 photocatalyst is WO 3 (namely g-C 3 N 4 /WO 3 ), the transport process of the photogenerated electrons and holes adopts the generic band–band transfer. Meanwhile, g-C 3 N 4 is covered by WO 3 powder, and the role of g-C 3 N 4 can not be played fully. The photocatalytic activity of the photocatalyst is not obviously increased. However, when the primary part of the WO 3 -g-C 3 N 4 photocatalyst is g-C 3 N 4 (namely WO 3 /g-C 3 N 4 ), the migration of photogenerated electrons and holes exhibits a typical characteristic of Z-scheme photocatalyst, and the photocatalytic activity of the photocatalyst is increased greatly.
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Huanhuan Zhang,Guosheng Han,Yanyan Liu,Lingli Zhao,Wenbo Zhang,Muhammad Tahir Khalil,Huijuan Wei,Chengming Wang,Tao Liu,Xianji Guo,Xianli Wu,Jianchun Jiang,Baojun Li
Designing non-precious catalysts to synergistically achieve a facilitated exposure of abundant active sites is highly desired but remains a significant challenge. Herein, a hetero-structured catalyst CoP-Co supported on porous g-C 3 N 4 nanosheets (CoP-Co/CN-I) was prepared by pyrolysis and P-inducing strategy. The optimal catalyst achieves a turnover frequency ( TOF ) of 26 min −1 at room temperature and the apparent activation energy ( E a ) is 35.5 kJ·mol −1 . The catalytic activity is ranked top among the non-precious metal phosphides or the other supports. Meanwhile, the catalytic activity has no significant decrease even after 5 cycles. The CoP/Co interfaces provide richly exposed active sites, optimize hydrogen/water absorption free energy via electronic coupling, and thus improve the catalytic activity. The experimental results reveal that the CoP/Co heterojunction improves the catalytic activity due to the construction of dual-active sites. This research facilitates the innovative construction of non-noble metal catalysts to meet industrial demand for heterogeneous catalysis .
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2020
·
IF 4.939
Yaya Wang,Yongqiang Cao,Yingjie Liu,Ping Yang
Increased charge transfer and light absorption as well as large specific surface area are effective ways to improve the catalytic efficiency of photocatalysts . In this paper, barbituric acid , urea and thiourea were separately freeze-dried to form a homogeneous precursor with melamine , followed by thermal polymerization at 750 °C, g-C 3 N 4 was doped successfully with C, N and S. Among them, C-doped g-C 3 N 4 revealed well photocatalytic hydrogen production which reached to 2.45 mmol g −1 h −1 . N-doped g-C 3 N 4 exhibited enhanced photocatalytic degradation properties for organic dye (RhB) which is completely degraded within 8 min while the performance S-doped sample is not satisfied. The introduction of C resulted in planarized sample which has a larger specific surface area and provides more active sites. N doping makes the valence band position moving in the direction of high energy. Thus, holes have stronger oxidizing ability. Accordingly, the effect of C and N ratios in g-C 3 N 4 photocatalysis was fully discussed for more comprehensive understanding of g-C 3 N 4 .
✓ 已验证
DOI
高影响因子
ChemSusChem
·
2019
·Vol. 13
·期 4
·827-837
·
IF 7.804
Huijuan Jing,Mingzhu You,Shasha Yi,Tao Li,Haipeng Ji,Yu Wang,Zongtao Zhang,Rui Zhang,Deliang Chen,Huaming Yang
Graphical Precursors and blessings : A precursor-engineering strategy coupled with a microwave molten-salt process is developed to synthesize g-C 3 N 4 with an isotype triazine/heptazine-based g-C 3 N 4 heterojunction as a photocatalyst for the hydrogen evolution reaction (HER) under visible light illumination. The promising HER activity is attributed to the composition and microstructure, efficient separation of electron–hole pairs, broadened photo-absorption edges, and narrowed band gaps. A precursor-engineering strategy coupled with a microwave molten-salt process (PE-MWMS) is developed to synthesize graphitic carbon nitride (g-C 3 N 4 ) with an isotype triazine/heptazine-based g-C 3 N 4 heterojunction as a photocatalyst for the hydrogen evolution reaction (HER) under visible light illumination. Four hybrid precursor combinations—thiourea/melamine, thiourea/dicyandiamide, urea/melamine, and urea/dicyandiamide—are used to synthesize g-C 3 N 4 heterojunctions by the PE-MWMS process. Control experiments indicate that the precursor components and microwave treatment have a great effect on the HER performance of the g-C 3 N 4 samples. Samples synthesized with the optimal molar ratios of thiourea/melamine (2:1), thiourea/dicyandiamide (2:1), urea/melamine (3:1), and urea/dicyandiamide (3:1), exhibit the highest HER rates of 3135, 2519, 2844, and 2565 μmol g −1 h −1 , respectively. The amounts of heptazine and triazine units in the g-C 3 N 4 samples can be easily adjusted by changing the ratios of the hybrid precursors and play a decisive role in improving the photocatalytic HER activity. Because of the unique composition and microstructure, the efficient separation of electron–hole pairs, the broadened photo-absorption edges, and the narrowed band gaps, the as-obtained triazine/heptazine-based g-C 3 N 4 nanostructures exhibit promising activity for HER application.
✓ 已验证
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2022
·
IF 5.518
Yongting Li,Jiayi Meng,Yue Zhu,Yongpeng Yang,Xiaoli Zhang,Xiucheng Zheng
Ammonia borane (AB) hydrolysis is a promising strategy for the development of hydrogen energy, and ultrafine metal nanoparticles (NPs) are attractive catalysts owing to their abundant active sites. In this work, porous graphitic carbon nitride (CN) are doped with reduced graphene oxide (rGO) and used as supports to evenly confine ultrafine Ru NPs with an adsorption-chemical reduction method. The results show that the different assembly methods and compositions affect the geometric and electronic characteristics of the composites, thus affecting the catalytic behavior in AB hydrolysis. Also, the effects of different Ru loadings and NaOH dosages are researched to improve the hydrolysis efficiency. Specifically, the optimal Ru/CN-rGO catalysts display exciting catalytic performance due to the proper porous structure, N, O co-doping and highly dispersed ultrafine Ru NPs . The corresponding turnover frequency (887.2 min −1 ) in the presence of NaOH (1.00 mol L −1 ) and the apparent activation energy (21.7 kJ mol −1 ) are superior to many previous results. The facile fabrication strategy and robust performance attest to a promising potential for Ru/CN-rGO in the fields of hydrogen energy.
✓ 已验证
DOI
高影响因子
Scientific Reports
·
2017
·Vol. 7
·期 1
·1-8
·
IF 4.259
Zhang Yifeng,Liu Yixin,Li Rongxia,Saddam Khan Malik,Gao Picheng,Zhang Yong,Wei Qin
Herein, a novel label-free photoelectrochemical (PEC) immunosensor based on SnS 2 @mpg-C 3 N 4 nanocomposite is fabricated for the detection of prostate specific antigen (PSA) in human serum. Firstly, mesoporous graphite-like carbon nitride (mpg-C 3 N 4 ) with carboxyl groups is synthesized successfully which possesses high specific surface area and large pore volume. Then, SnS 2 as a typical n-type semiconductor with weak photoelectric conversion capability is successfully loaded on carboxylated mpg-C 3 N 4 to form a well-matched overlapping band-structure. The as-synthesized SnS 2 @mpg-C 3 N 4 nanocomposite performs outstanding photocurrent response under visible-light irradiation due to low recombination rate of photoexcited electron-hole pairs, which is transcend than pure SnS 2 or pure mpg-C 3 N 4 . It is worth noting that SnS 2 @mpg-C 3 N 4 nanocomposite is firstly employed as the photoactive material in PEC immunosensor area. The concentration of PSA can be analyzed by the decrease in photocurrent resulted from increased steric hindrance of the immunocomplex. Under the optimal conditions, the developed PEC immunosensor displays a liner photocurrent response in the range of 50 fg·mL −1 ~ 10 ng·mL −1 with a low detection limit of 21 fg·mL −1 . Furthermore, the fabricated immunosensor with satisfactory stability, reproducibility and selectivity provides a novel method for PSA determination in real sample analysis.
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Bingke Xie,Dongyun Chen,Najun Li,Qingfeng Xu,Hua Li,Jinghui He,Jianmei Lu
Previously, many methods have been used to reduce NOx pollution. Semiconductor photocatalytic oxidation technology has been widely used among those methods because of its environmental friendliness, high efficiency, and simple implementation. Hybrid halide perovskites with exceptional optical properties prove to be promising photocatalysis material; however, their high surface energy, unpaired bonds, and instability are obstacles to large-scale application. In this work, FAPbBr 3 /g-C 3 N 4 heterostructures were successfully synthesized by growing FAPbBr 3 nanocrystals on 2D g-C 3 N 4 nanosheets. Compared with the pristine elements, FAPbBr 3 /g-C 3 N 4 composites show significant NO removal efficiencies under 600 ppb concentration at room temperature. The high performance could be attributed to the formation of a type-II heterojunction and accelerated the separation and transfer of electrons and holes. Furthermore, cycling experiments and XRD results verify that the FAPbBr 3 /g-C 3 N 4 heterojunction owns good stability. Thus, this work not only shows the great potential prospect of halide perovskite for the photocatalysis field, but also demonstrate its promise in solving energy issues and environment science.
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Junhua You,Wanting Bao,Lu Wang,Aiguo Yan,Rui Guo
As an effective method to solve the environmental crisis and energy reserve problems, visible light-driven photocatalysts have attracted widespread attention. Various semiconductor materials (such as WO 3 , CdS, g-C 3 N 4 , Ag 3 PO 4 and BiVO 4 ) have been used as photocatalysts. Therefore, in this work, CdS/C 3 N 4 composite photocatalysts were prepared by simple co-precipitation method to improve the performance of CdS, and Rhodamine B (RhB) was used to evaluate the photocatalytic activity. The results show that the composite photocatalyst containing 20% CdS has the highest photocatalytic activity. In addition, the effects of different temperatures on the properties of the samples were investigated by heat treatment. It shows that the properties of 20% CdS/C 3 N 4 (CS-20) are greatly improved after heat treatment, due to the multiphase structure.
✓ 已验证
DOI
高影响因子
CATALYSIS TODAY
·
2018
·
IF 4.667
Shuanglong Ma,Sihui Zhan,Yuguo Xia,Pengfei Wang,Qianlei Hou,Qixing Zhou
The Ag/ZnO/g-C 3 N 4 composite photocatalyst, which was synthesized by thermal polymerization of a melamine precursor combined with solvothermal reaction, was used as a visible-light-driven biocide toward Escherichia coli ( E. coli ). The Ag/ZnO/g-C 3 N 4 composite displayed considerably increased visible-light-driven bactericidal activity compared to g-C 3 N 4 , Ag/g-C 3 N 4 , and ZnO/g-C 3 N 4 powders. The photocatalytic destruction of E. coli cells was verified by fluorescence-based cell live/dead analysis and SEM. The mechanism of increased bactericidal effect was studied by UV–vis diffuse reflectance spectroscopy, photoluminescence spectroscopy, photocurrent response, and electrochemical impedance spectroscopy (EIS). The enhanced photocatalytic bactericidal effect was attributed to the matching conduction band levels of g-C 3 N 4 and ZnO and the surface plasmon resonance (SPR) effect of Ag nanoparticles, which resulted in enhanced adsorption of visible light, reduced recombination of free charges, and rapid separation and transportation of photogenerated electrons-holes. The disinfection mechanism was investigated using different chemical scavengers and electron spin-resonance spectroscopy (ESR), and indicating the important role of h + and H 2 O 2 . Furthermore, taking into account the bulk availability and better bactericidal effect of Ag/ZnO/g-C 3 N 4 , this work provides a new pathway to develop advanced materials for water disinfection.
✓ 已验证
DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2024
·Vol. 31
·期 11
·16795-16804
·
IF 0
Li Haiyu,Xu Mingze,Zhang Tingsong
The issue of water pollution has emerged as a formidable challenge, prompting a pressing need for solutions. The utilization of metal nanoparticles with surface plasmon resonance and semiconductor composite photocatalysts is regarded as a highly effective approach to solve this problem. g-C 3 N 4 is an effective catalyst for the degradation of organic pollutants. Its photocatalytic performance is usually enhanced by the use of the noble metal Au Ag. However, the high cost of these materials limits their application. In this study, we present the synthesis of Al NPs/g-C 3 N 4 nanocomposites using the bridging effect of ligands. The characterized of transmission electron microscopy (TEM), X-ray diffractometer (XRD) and ultraviolet-visible spectroscopy (UV-Vis) proved that Al NPs/g-C 3 N 4 with a wider light absorption range were successfully synthesized. The effects of ligands, (glutathione (GSH), glutamic acid (GAG), and cysteine (CYS)), Al diameter (40 to 200 nm) and the ratio of Al to g-C 3 N 4 (1:1 to 5:1) on the photocatalytic degradation of methylene blue (MB) by Al NPs/g-C 3 N 4 were also evaluated. The results showed that the optimum degradation efficiency of Al NPs/g-C 3 N 4 for MB at 5 mg/L reached 100% within 60 min, which was 11 times higher than that of pure g-C 3 N 4 . The principal analysis of Al enhancing the photocatalytic performance of g-C 3 N 4 was studied through transient photocurrent spectroscopy (TPC), electrochemical impedance spectroscopy (EIS), and steady-state transient fluorescence spectroscopy (PL). The results confirmed that hot carriers generated by localized surface plasmon resonance (LSPR) of Al nanoparticles increase the carrier concentration. In addition, the Schottky barrier generated by Al and g-C 3 N 4 could also improve the carrier separation rate and increase the carrier lifetime. This work is expected to solve the problem of organic wastewater treatment and lay the foundation for subsequent research on photocatalysis. Graphical abstract
✓ 已验证
DOI
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Xue Bai,Jiangna Xing,Xin Huang,Shiyu Sun,Na Wang,Ting Wang,Hongxun Hao
In recent years, g-C 3 N 4 has shown excellent advantages as a metal-free visible light-responsive catalyst in the field of environmental remediation. However, the pristine g-C 3 N 4 still has drawbacks such as small specific surface area, low visible light utilization and severe photogenerated carrier recombination. In this paper, a 3D spongy g-C 3 N 4 material (SC x ) was prepared using melamine and oxalamide based on the supramolecular self-assembly strategy. The role of oxalamide in the supramolecular self-assembly process and the effect on the morphology of g-C 3 N 4 were investigated and analyzed. The optical and photoelectrochemical properties of materials were studied using UV vis DRS, PL, EIS, etc., and the results indicate that porous structure, the increase of specific surface area and decrease of bandgap are the main reasons for enhanced degradation performance of 3D spongy g-C 3 N 4 . The results show that SC1 exhibits the best degradation rate (reaching 88.8 % within 60 min) and the reaction rate constant (0.0740 min −1 ). In addition, the SC1 has broad applicability to organic pollutants, excellent anti-interference ability and long-term stability. Furthermore, the degradation pathways were proposed using LC-MS and practical aquatic ecosystems experiments evaluated the toxicity of degradation products. Finally, the photocatalytic degradation mechanism was proposed based on free radical capture experiments and ESR spectra.
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）