JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2022
·
IF 4.598
Yaya Wang,Bo Wang,Ruixia Shi,Ling Chen,Quande Che,Junpeng Wang,Ping Yang
Graphic carbon nitride (g-C 3 N 4 ) as a typical photocatalyst has large specific surface area and high stability. However, the application for supercapacitors is limited because of its poor electrical conductivity. In this paper, three-dimensional (3D) g-C 3 N 4 /Mn 3 O 4 heterostructures with enhanced supercapacitor properties were constructed by a two-step synthesis. The precursor of 3Dg-C 3 N 4 /Mn 3 O 4 was firstly prepared by a freeze-drying process using NaCl as templates. After thermal polymerization at high temperature and subsequent removal of NaCl, 3D g-C 3 N 4 /Mn 3 O 4 heterostructures were constructed. As prepared samples revealed high specific capacitance performance which is related the well dispersion of Mn 3 O 4 in 3D g-C 3 N 4 networks to expose more redox catalytic centers. The result indicated with a current density of 1 A/g, the specific capacitance of sample prepared using optimized conditions was 753.9 F g −1 which is much higher than that of other samples. The stability test indicates the sample revealed high stability (84.1 %) after 5000 cycles under 5 A/g because of excellent structural stability of g-C 3 N 4 . The result provides a useful strategy for the application of g-C 3 N 4 in energy storage.
研究领域:
材料科学
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电化学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2018
·
IF 4.439
Lu Tan,Chongfei Yu,Miao Wang,Senyan Zhang,Jingyu Sun,Shuying Dong,Jianhui Sun
The g-C 3 N 4 -agar hybrid aerogel was obtained by a heating-cooling polymerization process with agar and g-C 3 N 4 powder as the raw material, which showed outstanding adsorption properties due to its three-dimensional network structure. Under the synergistic effect of adsorption and photocatalytic degradation, the hybrid aerogels could effectively remove organic pollutants from wastewater. The g-C 3 N 4 -agar hybrid aerogels could adsorb the methylene blue molecules to the surface of the photocatalyst, but the adsorption capacity decreases with the decrease of agar content. In addition, the optical absorption and photocurrent response show remarkable improvement with respect to g-C 3 N 4 -agar hybrid aerogels as compared with that of bare g-C 3 N 4 photocatalyst. The optimized 60% g-C 3 N 4 -agar sample exhibited preferable simulated-sunlight photocatalytic degradation efficiency towards the dye and antibiotic pollutants, as well as excellent recycle performance. Such a g-C 3 N 4 -agar hybrid aerogel could be envisaged to possess great potentials in practical wastewater treatment.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Xiaoxue Zhao,Jingru Guan,Jinze Li,Xin Li,Huiqin Wang,Pengwei Huo,Yongsheng Yan
The conversion of CO 2 into high value-added carbon-based compounds through photocatalytic reduction technology is considered as one of the more promising strategies to solve the greenhouse effect. And construction of heterojunction photocatalysts can promote the separation of photoelectron-hole pairs, so as to achieve higher activity of photocatalytic CO 2 reduction. Hence, Pt@CeO 2 /3DCN heterojunction are prepared by calcination method and photoreduction technology. The photocatalytic results revealed that Pt@CeO 2 /3DCN show better photocatalytic activity for reducing CO 2 into CO and CH 4 , compared with 3DCN. Especially, Pt@45CeO 2 /3DCN shows the maximum photocatalytic activity of 4.69 and 3.03 μmol·h −1 ·g −1 for CO and CH 4 under UV light irradiation, respectively, and the reduction activity did not decrease significantly after five cycles. The enhanced photoreduction of CO 2 performance can be ascribed to the synergistic effects of the oxygen vacancies in CeO 2 for CO 2 activation and heterojunction for electron separation. Besides, Pt nanoparticles (NPs) on CeO 2 /3DCN can further promote the transfer of electrons, resulting in higher photocatalytic activity.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
Nano Research
·
2023
·
IF 9.9
Yu Fan,Luo Chunjia,Niu Xiaohan,Chao Min,Zhang Pengfei,Yan Luke
Graphitic carbon nitride (g-C 3 N 4 ) nanosheets have attracted widespread interest in the construction of advanced separation membranes. However, dense stacking and a single functionality have limited the membrane development. Here, an advanced two-/three-dimensional (2D/3D) g-C 3 N 4 /TiO 2 @MnO 2 membrane is constructed by intercalating 3D TiO 2 @MnO 2 nanostructures into g-C 3 N 4 nanosheets. The 3D flower-like nanostructures broaden the transport channels of the composite membrane. The membrane can effectively separate five oil-in-water (O/W) emulsions, with a maximum flux of 3265.67 ± 15.01 L·m −2 ·h −1 ·bar −1 and a maximum efficiency of 99.69% ± 0.45% for toluene-in-water emulsion (T/W). Meanwhile, the TiO 2 @MnO 2 acts as an excellent electron acceptor and provides positive spatial separation of electrons–holes (e − –h + ). The formation of 2D/3D heterojunctions allows the material with wider light absorption and smaller bandgap (2.10 eV). These photoelectric properties give the membrane good degradation of three different pollutants, with about 100% degradation for methylene blue (MB) and malachite green (MG). The photocatalytic antibacterial efficiency of the membrane is also about 100%. After cyclic experiment, the membrane maintains its original separation and photocatalytic capabilities. The remarkable multifunctional and self-cleaning properties of the g-C 3 N 4 based membrane represent its potential value for complex wastewater treatment.
研究领域:
材料科学
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环境科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2018
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IF 6.735
Ning Li,Yu Tian,Jianhui Zhao,Jun Zhang,Wei Zuo,Lingchao Kong,Hao Cui
In this study, a newly-designed Z-scheme g-C 3 N 4 @ZnO heterostructure was synthesized by 3D ZnO controllable deposition on 2D g-C 3 N 4 nanosheets using thermal atomic layer deposition. The activity of 2D/3D g-C 3 N 4 @ZnO was evaluated by photocatalytic degradation of cephalexin under simulated sunlight. Results showed that the g-C 3 N 4 @ZnO photocatalyst achieved 98.9% degradation and 72.8% mineralization of cephalexin within 60 min of illumination. This degradation process fitted to the pseudo first order dynamic model with reaction rate constant of 0.0735 min −1 , 5.4 and 8.1 times higher than that of pure g-C 3 N 4 and ZnO, respectively. Consecutive degradation experiments revealed the excellent stability and recyclability of 2D/3D g-C 3 N 4 @ZnO photocatalyst. Mechanism exploration found the enhanced photocatalytic activity was mainly ascribed to the strong oxidizability of active species generated on Z-scheme g-C 3 N 4 @ZnO. Besides, the oxidative species, especially h + and · OH played significant roles in the degradation process. Moreover, the degradation intermediates were identified through HPLC/MS/MS analysis and the possible pathway of cephalexin decomposition was proposed accordingly. The Z-scheme 2D/3D g-C 3 N 4 @ZnO was also proved effective for contaminants removal in real sewage. This study provided a new platform for controllable creation of Z-scheme photocatalysts with broad application prospects in contaminants remediation from aquatic environment under solar light.
研究领域:
环境科学
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材料科学
✓ 已验证
DOI
高影响因子
Materials Research Express
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2020
·Vol. 7
·期 1
·015524
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IF 1.929
Ying Si,Xiaoxian Zhang,Tingting Liang,Xun Xu,Lingfang Qiu,Ping Li,Shuwang Duo
Constructing heterojunction is a promising method to enhance visible-light utility and promote photogenerated e−-h+ pairs separation of g-C3N4. Herein, the present work reported a g-C3N4/Cu2O heterojunction by a facile in situ synthetic strategy. The structure, morphology, optical, electrochemical and photocatalytic properties were investigated. The results showed the combination of g-C3N4 nanosheets and Cu2O nanospheres resulted in the close contact interface and wide visible-light response range, and fast separation of the photo-generated e−-h+ pairs. The pristine g-C3N4 showed weak photocatalytic performance towards methyl orange (MO) under visible-light irradiation, compared with pristine g-C3N4, the photocatalytic degradation rate of optimized g-C3N4/Cu2O composite demonstrates the substantially enhanced photocatalytic activity, which showed no obvious loss after five repeated use. The enhanced performance was ascribed to the synergistic effect of good visible-light harvesting and enhanced separation rate of the charge carriers.
研究领域:
材料科学
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环境科学
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化学
✓ 已验证
DOI
高影响因子
Journal of Cleaner Production
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2020
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IF 7.246
Qin Huang,Chen Wang,Derek Hao,Wei Wei,Luochun Wang,Bing-Jie Ni
The development of highly efficient and separation-free, low-cost photocatalysts have crucial prospect for sustainable wastewater treatment , because it is able to eliminate the hazards of organic pollutant with facile operation. However, the relatively high cost of previous photocatalysts highly obstructs the application of these materials. Herein, we report a cost-effective and distinct konjac/graphitic carbon nitride (KCN) aerogel , which has superior performance for advanced oxidation water treatment . The abundant porous structure of the ultralight aerogel ensures the rapid adsorption of pollutants, which is much helpful for the further photodegradation process. During the working process, the aerogel is half submerged in pollutant solution and half exposed in air, forming a distinctive gas-solid-liquid triphase system, where oxygen can be rapidly delivered into the solution via the porous channels, boosting the generation of hydroxyl and superoxide radicals. Meanwhile, the aerogel structure can separate the g-C 3 N 4 , obstruct its stacking, as well as improve the light absorption rate. The synthesis, utilization and readily biodegradable treatment of the KCN aerogels are all green and eco-friendly, which is extremely constructive for strategies to develop novel highly efficient photocatalytic materials.
研究领域:
环境科学
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材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2021
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IF 5.316
Jiajing Zhang,Yongjie Zheng,Heshan Zheng
Adjusting the desired structure and heterojunction interface of photocatalytic materials using a facile and efficient strategy is still challenging. In this study, a novel two-dimensional/three-dimensional (2D/3D) oxygen-doped g-C 3 N 4 /BiOI heterostructure nano-sphere (O-g-C 3 N 4 /BiOI) was successfully prepared by a facile solvothermal method for the degradation of nondye organic contaminants. Its composition , morphological characteristics, chemical structure and electrochemical properties have been measured. The result shows the introduction of oxygen doping (O-doping) causes a new defect energy level, extends the light absorption range, and the formation of heterojunction enables the effective separation of photo-generated carriers. Under visible light irradiation, the optimum ratio of O-g-C 3 N 4 /BiOI (2:1) exhibited 100% removal efficiency of bisphenol A within 80 min, which was about 9.1, 2.33, 3.45, and 1.6 times that of pure g-C 3 N 4 , O-g-C 3 N 4 , BiOI, and O-doped-poor heterostructure, respectively. Based on the identified intermediates, the photocatalytic mechanism of O-doped O-g-C 3 N 4 /BiOI (2:1) was also revealed. This finding suggested that the synergistic effect between 2D/3D heterojunction and O-doped greatly promoted visible light photoabsorption and photoinduced carrier separation efficiency with a prolonged lifetime, which was confirmed by multiple optical and electrochemical analyses . This study could bring new opportunities for the rational design of highly efficient photocatalysts by combining 2D/3D heterojunctions with O-doped in environmental remediation.
研究领域:
材料科学
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环境化学
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光催化
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纳米材料
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半导体异质结
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Yanan Wang,Jiayu Ding,Qi Yin,Cheng Zhang,Yiqing Zeng,Song Xu,Qian Liang,Man Zhou,Zhongyu Li
This study developed a novel Cu@C/NCN-T composite for efficient photothermal catalytic CO 2 reduction. The composite, consisting of carbon-coated Cu (Cu@C) derived from Cu-BTC embedded in three-dimensional graphitic carbon nitride (NCN-T), was immobilized on the surface of carbonized wood (C-wood) floating on water, creating a triphase system (CO 2 , H 2 O, and catalyst). The optimized composite demonstrated remarkable CO 2 photothermal reduction performance, achieving a rate of 31.3 μmol·g −1 ·h −1 . This performance surpassed that of pure NCN-T and Cu@C by 1.6 and 3.8 times, respectively. The combination of Cu and carbon materials endowed Cu@C/NCN-T with excellent light-absorption properties, resulting in a photothermal effect that elevated the surface temperature and facilitated the catalytic reaction . Furthermore, the Schottky junction formed between Cu@C and NCN-T promoted the separation of electron-hole pairs, with Cu@C acting as charge channels. A charge transfer mechanism was proposed to explain these findings. This catalyst engineering approach holds promise for the development of efficient non-noble metal catalysts for rapid CO 2 photothermal reduction.
研究领域:
材料科学
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环境科学
·
化学
✓ 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）