CATALYSIS TODAY
·
2018
·
IF 4.667
Ming Wu,Hongying Lv,Teng Wang,Zhimin Ao,Hongqi Sun,Chengyin Wang,Taicheng An,Shaobin Wang
Graphitic carbon nitride (g-C 3 N 4 ), a promising metal-free photocatalyst, shows a high thermal stability, excellent chemical stability, and great optical absorption of solar light. However, a short life of activated electron-hole pairs limits g-C 3 N 4 in practical applications. In this work, Ag 2 MoO 4 nanoparticles encapsulated in g-C 3 N 4 (Ag 2 MoO 4 /g-C 3 N 4 ) was synthesized with a facile in-situ precipitation method. A variety of characterization techniques were applied for analyzing the compositions, morphologies and optical properties of Ag 2 MoO 4 /g-C 3 N 4 . The band structure of Ag 2 MoO 4 produces a synergistic effect with g-C 3 N 4 , which can efficiently increase solar light absorption and reduce the recombination rate of the photo-induced electron-hole pairs. Therefore, this hybrid catalyst presents a much higher photocatalytic activity for the degradation of various organic pollutants (bisphenol A, acyclovir, and methyl orange) and strong stability under both artifical and real sunlight, which is promising for practical application.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
ChemCatChem
·
2018
·Vol. 11
·期 3
·1069-1075
·
IF 4.674
Rui Tong,Zhi Sun,Xiongwei Zhong,Xina Wang,Jincheng Xu,Ye Yang,Baomin Xu,Shuangpeng Wang,Hui Pan
Graphical Photocatalytic hydrogen production : g-C 3 N 4 /CeCO 3 OH/CeO 2 ternary composite showed greatly enhanced photocatalytic performance for hydrogen production under visible light irradiation. Promoting the separation of photo-generated carriers is significantly important to improve the efficiency of photocatalytic hydrogen production. Therefore, we prepared g-C 3 N 4 /CeCO 3 OH/CeO 2 (CeCeCN) ternary nanocomposite via an easy synthetic way using g-C 3 N 4 and CeO 2 as reactants. A CeCO 3 OH layer was formed and resulted in the novel ternary photocatalyst. The CeCeCN composite shows superior photocatalytic (PC) H 2 generation performance in sunlight excitation. The H 2 evolution rate is about 764 μmol h −1 g −1 , which is over 11 times larger than those of g-C 3 N 4 and CeO 2 . Compared with g-C 3 N 4 and CeO 2 , CeCeCN further shows a larger photo-response current density and a lower charge-transfer resistance. The remarkably increased photocatalytic property of CeCeCN is because of the efficient charge migration induced by the formed heterojunction. Our findings demonstrate that building multi-heterostructures can liberate more excited electrons for efficient hydrogen production under sunlight.
研究领域:
材料科学
·
能源科学
✓ 已验证
DOI
高影响因子
MOLECULES
·
2022
·Vol. 27
·期 21
·7178
·
IF 4.927
Yan Chen,Ao Li,Xiuli Fu,Zhijian Peng
The difficulty of exposing active sites and easy recombination of photogenerated carriers have always been two critical problems restricting the photocatalytic activity of g-C3N4. Herein, a simple (NH4)2MoO4-induced one-step calcination method was successfully introduced to transform bulk g-C3N4into g-C3N4/MoO2composites with a large specific surface area. During the calcination, with the assistance of NH3and water vapor produced by ammonium molybdate, the pyrolytical oxidation and depolymerization of a g-C3N4interlayer were accelerated, finally realizing the exfoliation of the g-C3N4. Furthermore, another pyrolytical product of ammonium molybdate was transformed into MoO2under an NH3atmosphere, which was in situ loaded on the surface of a g-C3N4nanosheet. Additionally, the results of photocatalytic hydrogen evolution under visible light show that the optimal g-C3N4/MoO2composite has a high specific surface area and much improved performance, which is 4.1 times that of pure bulk g-C3N4. Such performance improvement can be attributed to the full exposure of active sites and the formation of abundant heterojunctions. However, with an increasing feed amount of ammonium molybdate, the oxidation degree of g-C3N4was enhanced, which would widen the band gap of g-C3N4, leading to a weaker response ability to visible light. The present strategy will provide a new idea for the simple realization of exfoliation and constructing a heterojunction for g-C3N4simultaneously.Keywords:g-C3N4;MoO2;exfoliation;photocatalytic hydrogen evolution
研究领域:
材料科学
·
化学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
TALANTA
·
2014
·
IF 3.511
Xiaohua Jiang,Huimin Zhang,Jun Wu,Xiang Yang,Jingwei Shao,Yujing Lu,Bin Qiu,Zhenyu Lin,Guonan Chen
In this paper, a novel label-free G-quadruplex DNAzyme sensor has been proposed for colorimetric identification of GMO using CaMV 35S promoter sequence as the target. The binary probes can fold into G-quadruplex structure in the presence of DNA-T (Target DNA) and then combine with hemin to form a DNAzyme resembling horseradish peroxidase . The detection system consists of two G-rich probes with 2:2 split mode by using the absorbance and color of ABTS 2− as signal reporter. Upon the addition of a target sequence, two probes both hybridize with target and then their G-rich sequences combine to form a G-quadruplex DNAzyme, and the DNAzyme can catalyze the reaction of ABTS 2− with H 2 O 2 . Then the linear range is from 0.05 to 0.5 μM while detection limit is 5 nM. These results demonstrate that the proposed G-quadruplex DNAzyme method could be used as a simple, sensitive and cost-effective approach for assays of GMO.
研究领域:
生物化学
·
分子生物学
·
食品科学
✓ 已验证
DOI
高影响因子
Nanomaterials
·
2018
·Vol. 8
·期 6
·427
·
IF 3.504
Meiyin Wang,Hui Wang,Yuanhang Ren,Cheng Wang,Zhewei Weng,Bin Yue,Heyong He
A series of composites consisting of g-C3N4sheet and mesoporous Nb2O5(mNb2O5) microsphere were fabricated by in situ hydrolysis deposition of NbCl5onto g-C3N4sheet followed by solvothermal treatment. The samples were characterized using powder X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), transmission electron microscopy (TEM), N2adsorption-desorption, X-ray photoelectron spectroscopy (XPS), UV-vis diffuse reflectance spectroscopy (DRS) and photoluminescence spectroscopy (PL). The photocatalytic activity of the composites was studied by degradation of rhodamine B (RhB) and tetracycline hydrochloride (TC-HCl) in aqueous solution under visible light irradiation (λ> 420 nm). Compared with g-C3N4and mNb2O5, g-C3N4-mNb2O5composites have higher photocatalytic activity due to synergistic effect between g-C3N4and mNb2O5. Among these composites, 4% g-C3N4-mNb2O5has the highest efficiency and good recyclability for degradation of both RhB and TC-HCl.Keywords:photocatalytic degradation;g-C3N4;mesoporous Nb2O5;organic pollutant
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
PubMed
高影响因子
RSC Advances
·
2022
·Vol. 12
·期 23
·14765-14775
·
IF 4.036
Lei Liu,Wei Zhang,Ming-Qing Zhong,Meng-Hao Jia,Fei Jiang,Yan Zhang,Chao-Da Xiao,Xin Xiao,Xiang-Chun Shen
G-Quadruplex (G4), as a non-canonical nucleic acid secondary structure, has been proved to be prevalent in genomes and plays important roles in many biological processes. Ligands targeting G4, especially small-molecular fluorescent light-up probes with selectivity for special conformations, are essential for studying the relationship between G4 folding and the cellular response. However, their development still remains challenging but is attracting massive attention. Here, we synthesized a new tetraphenylethene derivative, namely TPE-B, as a parallel G4 probe. Fluorescence experiments showed that TPE-B could give out a strong fluorescence response to the G4 structure. Moreover, it gave a much higher fluorescence intensity response to parallel G4s than anti-parallel ones, which indicated that TPE-B could serve as a special tool for probing parallel G4s. The circular dichroism (CD) spectra and melting curves showed that TPE-B could selectively bind and stabilize parallel G4s without changing their topology. ESI-MS studies showed that TPE-B could bind to parallel G4 with a 1 : 1 stoichiometry. The gel staining results showed that TPE-B was a good candidate for probing parallel G4s. Altogether, the TPE-B molecule may serve as a promising new probe that can discriminate parallel G4s.
研究领域:
分子生物学
·
化学生物学
·
核酸结构研究
✓ 已验证
DOI
PubMed
高影响因子
Journal of Materials Chemistry A
·
2022
·Vol. 10
·期 42
·22819-22833
·
IF 14.511
Renzhi Xiong,Changcun Tang,Kunjiao Li,Jiabao Wan,Weifeng Jia,Yanhe Xiao,Baochang Cheng,Shuijin Lei
It is an effective method to promote the activity of photocatalysts by exploiting their own photothermal effects to increase the temperature of the reaction center and thus accelerate the kinetic process of photocatalysis. In this study, for the first time, a CoCr2O4/g-C3N4 composite photocatalyst is designed through the construction of CoCr2O4 nanoparticles decorated tremella-like porous g-C3N4. On the one hand, the type-II heterostructure can be formed and effectively improves the separation efficiency of photogenerated carriers. On the other hand, the photothermal effect of plasmonic CoCr2O4 nanoparticles can significantly increase the temperature of the reaction system, thereby enhancing the photocatalytic efficiency. CoCr2O4 nanoparticles exhibit a broad-band strong absorption in the near-infrared region. Under full spectrum illumination for 300 s, their surface temperature can be increased by 113 °C, demonstrating excellent photothermal properties. Although the bare CoCr2O4 nanoparticle sample does not show the photocatalytic activity of water splitting for hydrogen evolution, the optimized g-C3N4/CoCr2O4 heterostructure composite exhibits an average hydrogen production rate as high as 1525.1 μmol g−1 h−1 under UV-Vis-IR illumination, which is 4.0 and 5.8 times higher than that of bare g-C3N4 under UV-Vis-IR and UV-Vis light illumination, respectively. This work provides a new guide for designing novel photothermal-assisted photocatalytic composite materials.
研究领域:
材料科学
·
能源科学
✓ 已验证
DOI
高影响因子
CARBON
·
2024
·
IF 10.5
Xiqing Xie,Qiaoqi Guo,Shujing Yu,Huajun Feng,Yingfeng Xu
The photothermal effect has been recognized as a universal promoter in various photocatalytic reactions. However, in many promising nanocomposite systems, the integration of heterogeneous photothermal materials with photocatalysts remains a significant technical challenge. Focusing on the emerging graphitic carbon nitride (g-C 3 N 4 ) based photocatalyst, we identified that the segregation of the introduced photothermal particles results from the dynamic instability of the original solid-solid dispersion system, which essentially origins from a sluggish two-step solid-liquid-solid phase transformation of urea towards g-C 3 N 4 . By taking advantages of the photothermal particles to be loaded, we developed a photothermal-polymerization strategy to create a rapid heating to overcome their undesired segregation during g-C 3 N 4 formation. The strategy enables a one-step loading of various photothermal particles on the g-C 3 N 4 , presenting a versatile methodology. This sustainable technique enhances the synthesis yield of g-C 3 N 4 by 352 % with reduced energy consumption. The derived photothermal particles-dispersed g-C 3 N 4 shows 290 % improvement in photocatalytic CO 2 reduction compared to the separated system, which is obtained from the traditional heating synthesis. Beyond enriching the accessible categories of composite catalysts, this study may deepen physiochemical insights into the dynamic transformation of the novel dispersion system.
研究领域:
材料科学
·
催化化学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Ruizheng Xu,Guiyu Wei,Zhemin Xie,Sijie Diao,Jianfeng Wen,Tao Tang,Li Jiang,Ming Li,Guanghui Hu
Increasing the efficiency of charge transfer and separation efficiency of photogenerated carriers are still the main challenges in the field of semiconductor-based photocatalysts. Herein, we synthesized g-C 3 N 4 @V 2 C MXene photocatalyst by modifying g-C 3 N 4 using V 2 C MXene. The prepared photocatalyst exhibited outstanding photocatalytic performance under visible light. The degradation efficiency of methyl orange by g-C 3 N 4 @V 2 C MXene photocatalyst was as high as 94.5%, which is 1.56 times higher than that by g-C 3 N 4 . This was attributed to the V 2 C MXene inhibiting the rapid recombination of photogenerated carriers and facilitating rapid transfer of photogenerated electrons (e − ) from g-C 3 N 4 to MXene. Moreover, g-C 3 N 4 @V 2 C MXene photocatalyst showed good cycling stability. The photocatalytic performance was higher than 85% after three cycles. Experiments to capture free radicals revealed that superoxide radicals (·O 2 − ) are the main contributors to the photocatalytic activity. Thus, the proposed g-C 3 N 4 @V 2 C MXene photocatalyst is a promising visible-light catalyst.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2017
·
IF 3.387
Xinzhou Ma,Jingtao Zhang,Biao Wang,Qiuguo Li,Sheng Chu
Solar photoelectrochemical (PEC) hydrogen production is a promising way for solving energy and environment problems. Earth-abundant Cu 2 O is a potential light absorber for PEC hydrogen production. In this article, hierarchical porous Cu 2 O foams are prepared by thermal oxidation of the electrochemically deposited Cu foams. PEC performances of the Cu 2 O foams are systematically studied and discussed. Benefiting from their higher light harvesting and more efficient charge separation, the Cu 2 O foams demonstrate significantly enhanced photocurrents and photostability compared to their film counterparts. Moreover, by integrating g-C 3 N 4 , hierarchical Cu 2 O foam/g-C 3 N 4 composites are prepared with further improved photocurrent and photostability, appearing to be potential photocathodes for solar PEC hydrogen production. This study may provide a new and useful insight for the development of Cu 2 O-based photocathodes for PEC hydrogen production.
研究领域:
材料科学
·
可再生能源
✓ 已验证
DOI
高影响因子
Journal of Coatings Technology and Research
·
2025
·
IF 2.8
Tang Baoling,He Ziyu
The commonly used dispersants for graphene dispersions reduce the conductivity of the composite. In this work, a dispersant with an amphiphilic structure, CA-g-PANI, has been designed and synthesized. The dispersant grafts citric acid (CA) onto polyaniline via an amide reaction, which gives CA-g-PANI the hydrophilic groups (carboxyl groups) and the benzene ring structures that can be π–π conjugated with graphene, and it can improve the dispersion properties of graphene; CA-g-PANI contains the polyaniline structure, which is electrically conductive and enhances the electrical conductivity of graphene dispersions. The molecular structure and properties of the dispersant were systematically characterized through FTIR spectra, UV absorption spectra, and other methods. The graphene-based composites were prepared by screen printing method, and the dispersibility and resistivity of CA-g-PANI were compared with gum arabic and alkali lignin (natural dispersants). Graphene concentration reached up to 30 mg/mL in the presence of CA-g-PANI at the weight ratio of 1:0.03 (CA-g-PANI: graphene). CA-g-PANI also exhibited good performance for stabilizing graphene (stable for 6 days), with an electrical conductivity of up to 917.43 S/m. In the study, it was shown that CA-g-PANI as a graphene dispersant improved the conductivity of graphene dispersions while enhancing the dispersing properties of graphene.
研究领域:
材料科学
·
化学工程
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
Inorganics
·
2025
·Vol. 13
·期 3
·77
·
IF 3
Jinghang Li,Qi Shi,Chaoyu Song,Chenxi Shi,Yuguang Lv
To address challenges in antibiotic wastewater treatment, we synthesized a series of graphitic carbon nitride (g-C3N4)-based photocatalysts (BCN, PCN, TCN, BTCN, and TCNE-modified PTCN) via defect engineering. TCNE modification disrupted the triazine ring-bridging amino network in PTCN, forming a porous structure with enhanced specific surface area validated by SEM/TEM while retaining the graphene-like framework confirmed by XRD/FTIR. Photoluminescence (PL) analysis revealed prolonged photogenerated carrier lifetime and improved separation efficiency in PTCN, achieving 89.10% degradation of chlortetracycline hydrochloride under visible light—1.65-fold higher than pristine g-C3N4. Mechanistic studies identified superoxide radicals (•O2−) as dominant active species, generated via O2activation at defect sites and efficient electron-hole utilization. Optimized conditions enabled PTCN to maintain high activity across a broad pH range and retain 82.59% efficiency after five cycles. This work advances defect-engineered photocatalyst design for adaptable, high-performance antibiotic degradation, offering practical insights for wastewater remediation.
研究领域:
环境科学
·
材料科学
·
生物学
✓ 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）