CHEMICAL PHYSICS LETTERS
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2024
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IF 2.8
Ye Liu,Lei Zhang,Yubo Kuang,Xiaoqian Xiang,Haohan Tao,Guangran Di,Xiaojing Yin,Meicheng Li,Xiao-Jun Lv
The photocatalytic CO 2 reduction has the problems of low selectivity of single product. Here, the preparation of Cu modified tubular C 3 N 4 (CTN) was studied. The increase of the active site inhibits the recombination of electrons (e-) and holes (h + ) and improves the selectivity of CO 2 reduction products. Finally, the CO and CH 4 yields of 1.5 % CTN photocatalyst are 11.55 μmol·g −1 and 4.72 μmol·g −1 , respectively, which are 5 times higher than that of tubular C 3 N 4 photocatalyst. The selectivity of 2 % CTN to CH 4 is up to 68 %, indicating that the prepared CTN photocatalyst has high CO 2 reduction activity and CH 4 selectivity.
研究领域:
材料科学
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环境科学
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化学工程
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DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2024
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IF 8.1
Yan Ding,Chang Bo,Lan Xin Li,Chenyu Gao,Xin Chi Ma,Zhiwei Li,Libin Yang
As a new method to obtain green and renewable energy, photocatalysis , converting from sunlight to chemical energy on the catalysts, shows its superiority since being experimentally found due to easy access and cleanliness. Graphite carbon nitride (g-C 3 N 4 ), as an efficient photocatalyst with a band gap respond to visible light, is prepared in nanotube morphology by template method to provide convenience for the directional transfer of light and separation of carriers to improve photocatalytic activity and quantum efficiency . The thicknesses of g-C 3 N 4 nanotubes (NTs) were controlled by addition amount of the precursor mass in the annealing treatment process. The migration of photogenerated electrons and holes in the wall of g-C 3 N 4 NTs was accelerated in reverse to bypass recombination center in an external magnetic field to improve the photocatalytic activity. The critical thickness of g-C 3 N 4 NTs wall is 72 nm for separating and impelling the photogenerated carrier pairs to the surface in the greatest extent possible and was proved by the experimental results of photoelectrochemical tests and photoluminescence spectra.
研究领域:
材料科学
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能源科学
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DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2024
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IF 8.1
Jinxiang Dai,Zhixin Liu,Yanyu Song,Yongdi Liu,Long D. Nghiem,Qilin Wang,Wen Liu,Xianbo Sun,Zhengqing Cai
A novel heterocyclic polymerized g-C 3 N 4 nanotube was prepared by thermal polycondensation using urea and 2,4,6-triaminopyrimidine (TAP). The TAP-polymerized g-C 3 N 4 composite with 0.5 wt% TAP content showed the highest photocatalytic activity for ciprofloxacin (CIP) degradation under solar irradiation. The optimal composite derived from urea achieved ∼ 10.8 and ∼ 7.5 time of CIP degradation activity when compared with TAP-polymerized g-C 3 N 4 derived from melamine and thiourea. The copolymerization of TAP molecules reduces the π electron defects in the g-C 3 N 4 conjugated system thus accelerates the migration of photogenerated carriers. The doping of TAP in g-C 3 N 4 reduces its band gap, which enhances the light absorption capacity and improves the utilization efficiency of visible light. The fluffy porous nanotube structure of the material endows it with unique surface morphology and excellent photoelectric characteristic. Electron spin resonance (ESR) and probe technology were used for qualitative or quantitative detection of free radicals in this work. Superoxide radicals ( O 2 · - ) played the major roles in the photodegradation of CIP. Recycling experiments displayed the high stability and activity of the modified materials, which is potentially applicable in practical engineering. Moreover, the photodegradation pathways and mechanisms of CIP were proposed and its toxicity evolution was assessed in this study. This work revealed the specific application of heterocyclic polymerization in modifying g-C 3 N 4 material and provided unique insights for its application in photocatalytic degradation of antibiotic.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2024
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IF 9.4
Yang Ding,Chunhua Wang,Sateesh Bandaru,Lang Pei,Runtian Zheng,Yun Hau Ng,Daniel Arenas Esteban,Sara Bals,Jiasong Zhong,Johan Hofkens,Gustaaf Van Tendeloo,Maarten B.J. Roeffaers,Li-Hua Chen,Bao-Lian Su
Solar-light driven oxidation of benzylic alcohols over photocatalysts endows significant prospects in value-added organics evolution owing to its facile, inexpensive and sustainable process. However, the unsatisfactory performance of actual photocatalysts due to the inefficient charge separation, low photoredox potential and sluggish surface reaction impedes the practical application of this process. Herein, we developed an innovative Z-Scheme Cs 3 BiBr 9 nanoparticles@porous C 3 N 4 tubes (CBB-NP@P-tube-CN) heterojunction photocatalyst for highly selective benzyl alcohol oxidation. Such composite combining increased photo-oxidation potential, Z-Scheme charge migration route as well as the structural advantages of porous tubular C 3 N 4 ensures the accelerated mass and ions diffusion kinetics , the fast photoinduced carriers dissociation and sufficient photoredox potentials. The CBB-NP@P-tube-CN photocatalyst demonstrates an exceptional performance for selective photo-oxidation of benzylic alcohol into benzaldehyde with 19, 14 and 3 times higher benzylic alcohols conversion rate than those of C 3 N 4 nanotubes , Cs 3 Bi 2 Br 9 and Cs 3 Bi 2 Br 9 @bulk C 3 N 4 photocatalysts, respectively. This work offers a sustainable photocatalytic system based on lead-free halide perovskite toward large scale solar-light driven value-added chemicals production.
研究领域:
材料科学
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环境科学
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化学工程
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DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2020
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IF 10.652
Nannan Wang,Bonan Hao,Hao Chen,Rongkang Zheng,Baojie Chen,Shihong Kuang,Xiaodong Chen,Lifeng Cui
Developing a cost-effective, efficient, and facile prepared electrocatalyst for oxygen reduction (ORR) and evolution reaction (OER) is critical for a range of renewable energy technologies. Herein, we report unique Co 4 N nanoparticles loading on g-C 3 N 4 nanotubes (Co 4 N@CNNT) bifunctional electrocatalyst for OER and ORR by an in-situ method. Highly dispersed Co 4 N nanoparticles as the active sites gather at the top of the g-C 3 N 4 nanotube (CNNT), while the six-fold cavities from smooth CNNT with an outer diameter of 48 nm and an inner diameter of 22 nm act as anchor sites to preferentially coordinate with the active sites. Benefiting from the distinctive structure features, the intrinsic metallic Co 4 N@CNNT exhibits high electrocatalytic performances. Electrochemistry studies show that an onset potential of 0.94 V and a half-wave potential of 0.86 V of Co 4 N@CNNT are obtained that are superior to Pt/C catalyst. A low overpotential of 285 mV at an anodic current density of 10 mA cm −2 during the OER process is obtained that is superior to the IrO 2 catalyst; and lower Tafel plot and good durability are also observed. Our findings provide a new strategy for the fabrication of an efficient bifunctional electrocatalyst for OER and ORR.
研究领域:
材料科学
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电化学
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可再生能源技术
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DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2024
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IF 8.1
Honggang Lu,Ruiming Jia,Chenjie Wang,Wei Guan,Peng Wang,Lin Zhang,Zhixing Gan,Lifeng Dong,Liyan Yu,Lina Sui
Bare g-C 3 N 4 (CN) encounters substantial charge recombination with strong fluorescence, which is detrimental to the photocatalytic reactions. In this work, g-C 3 N 4 is curved into nanotubes then combined with black phosphorus quantum dots (BPQDs). The BPQDs decorated tubular CN (BPTCN) exhibits a stable and high photocatalytic hydrogen evolution rate of 507.51 μmolh −1 g −1 under visible irradiation, which is four times higher than that of pure TCN. The apparent quantum yield (AQY) at 420 nm of BPTCN reaches 2.58%. The excellent photocatalytic ability of the BPTCN is attributed the suppressed recombination of electron-hole pair and improved carrier transport efficiency, which are introduced by the 1D tubular structure and the band alignment of the BPTCN heterojunction.
研究领域:
材料科学
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光催化
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DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2016
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IF 8.328
Kexin Li,Zhenxing Zeng,Liushui Yan,Mingxin Huo,Yihang Guo,Shenglian Luo,Xubiao Luo
A series of nonmetallic elements co-doped titanium dioxide coated carbon nitride nanotubes (C/X-TiO 2 @C 3 N 4 NTs, X = N, F, Cl) was successfully prepared by a simple sol-gel-pyrolysis process using phenolic organic pollutants, titanium butoxide, and carbon nitride nanotubes as precursors. The morphology, porosity, phase and chemical structure, and optical and electronic property of as-prepared C/X-TiO 2 @C 3 N 4 NTs were well characterized. The as-prepared C/X-TiO 2 @C 3 N 4 NTs exhibited excellent visible-light photocatalytic activity in the conventional degradation and hydrogen evolution systems compared with traditional TiO 2 /g-C 3 N 4 heterojunction, which is attributed to their unique tubular nanostructure and nonmetallic elements co-doped TiO 2 component. Subsequently, the visible-light photocatalytic activity of C/X-TiO 2 @C 3 N 4 NTs was further studied in the simultaneous hydrogen evolution with organic pollutant degradation system on the basis of our previous work. The reaction mechanisms in different photocatalytic systems were further discussed in detail.
研究领域:
材料科学
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环境科学
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化学工程
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）