APPLIED CATALYSIS B-ENVIRONMENTAL
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2018
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IF 11.698
Huiliang Li,Fengping Li,Zeyan Wang,Yachen Jiao,Yuanyuan Liu,Peng Wang,Xiaoyang Zhang,Xiaoyan Qin,Ying Dai,Baibiao Huang
Carbon bridged graphitic carbon nitride (g-C 3 N 4 ) was prepared by a facile supramolecular self-assembly method. Experimental results and theoretical calculations indicate C atoms were introduced into the g-C 3 N 4 lattice by substituting the bridged N atoms. As a result, the delocalized big π bonds can be formed among the adjacent heptazine rings, which could both enhance the light absorption and promote the charge separation. Beneficial from the efficient charge separation and enhanced light absorption, the carbon bridged g-C 3 N 4 exhibits high efficient photocatalytic activity, where the H 2 evolution rate is about 7 times as high as that of pristine g-C 3 N 4 . This work demonstrates carbon bridged C 3 N 4 can be fabricated by a simple supramolecular self-assembly process, which could be useful for the further development of high efficient g-C 3 N 4 photocatalysts.
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CERAMICS INTERNATIONAL
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2018
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IF 3.057
Yang Li,Xinyan Xiao,Zhihao Ye
A novel ellipsoidal (t-s) BiVO 4 modified g-C 3 N 4 composite photocatalyst was fabricated via a facile two-step synthesis strategy in the assistance of ultrasonic and magnetic stirring method. In this typical process, (t-s) BiVO 4 was prepared by using a modified polyol method, and the coupling process of (t-s) BiVO 4 with g-C 3 N 4 was executed after ultrasonic treatment in the ethanol system. The photocatalytic activity of the as-obtained composites was evaluated by monitoring the degradation process of Rhodamine B (RhB) under the simulated sunlight irradiation. The results revealed that the highest degradation efficiency can reach up to 97.7% in 120 min when the mass ratio of (t-s) BiVO 4 and g-C 3 N 4 came to be 1:16. And the optimum degradation rate was 0.03088 min −1 , which was 4.6 and 47.5 times faster than that of the bare g-C 3 N 4 and (t-s) BiVO 4 , respectively. The trapping experiments were conducted to verify that h + and secondary·O 2 - radicals were the main active species in the photocatalytic process. The enhanced photocatalytic performance can be attributed to the synergetic effect of the heterojunction formed at the interface of g-C 3 N 4 and (t-s) BiVO 4 , which resulted in the enlarged optical absorption range and improved separation ability of photo-induced carriers.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2018
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IF 11.698
Juanjuan Zhang,Xu Zhao,Yanbin Wang,Yan Gong,Di Cao,Meng Qiao
In this study, a metal-free photocatalyst (PI-g-C 3 N 4 ) was synthesized through an amidation reaction between perylene tetracarboxylic dianhydride (PTCDA) and graphitic carbon nitride (g-C 3 N 4 ). In order to enhance the photocatalytic degradation efficiency of bisphenol A (BPA) by 5 wt% PI-g-C 3 N 4 , peroxymonosulfate (PMS) was introduced into this system. When 5 mM PMS was added, 96% of BPA with an initial concentration of 10 mg/L was degraded within 60 min; the pseudo-first-order degradation kinetics constant of BPA was increased from 0.0057 to 0.0501 min −1 . Based on the photoelectrochemical analysis, it was proposed that PI-g-C 3 N 4 achieved a more effective separation of photogenerated electron–hole pairs and displayed higher conductivity than PTCDA and g-C 3 N 4 individually, thus promoting the PMS activation into active radicals by the photogenerated electrons. The BPA degradation was favored at high PMS concentrations under alkaline conditions. The slight inhibition effect of co-existing anions on the degradation of BPA followed the order: H 2 PO 4 − > NO 3 − ≈ HCO 3 − ; Cl − had a remarkable positive effect on the degradation of BPA. The radical quenching tests and electron spin resonance results indicated that O 2 − , 1 O 2 , and h + were the major species for the degradation of BPA. Combined with intermediates analysis, the degradation mechanism and pathway of BPA was proposed. The high stability of the 5 wt% PI-g-C 3 N 4 was finally demonstrated.
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JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
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2018
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IF 2.891
Zhi Zhu,Wenqian Fan,Zhi Liu,Hongjun Dong,Yongsheng Yan,Pengwei Huo
A novel intercalation structure g-C 3 N 4 photocatalyst is successfully fabricated by eutectic technique and calcination method, it shows a better degradation efficiency to tetracycline under the visible light. Moreover, the as-prepared photocatalysts are characterized by a series of means, such as PL, FL spectra, EIS, ESR etc. The improved photocatalytic performance could be attributed to the intercalation effect and conductivity of attapulgite (ATP), which enhanced the optical absorption and separation efficiency of photogenerated electron-holes (decay lifetime is 4.3 ns). Moreover, radical trapping experiments and ESR measurement indicated the superoxide radical and photogenerated holes are the major activity species on removing tetracycline in g-C 3 N 4 @ATP. The degradation mechanism and the degradation intermediate products are proposed to better understand the reaction process. Additionally, the work provides a new insight for constructing other high performance, low-cost and intercalation structure photocatalyst for wastewater treatment.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2018
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IF 3.779
Zhi Zhu,Xu Tang,Wenqian Fan,Zhi Liu,Pengwei Huo,Tianshuai Wang,Yongsheng Yan,Chunxiang Li
A new Co-doped and Fe 3 O 4 quantum dots (QDs) decorated g-C 3 N 4 (CN) photocatalyst applied in the tetracycline degradation under visible light irradiation, is designed and synthesized. The Fe 3 O 4 -QDs@Co CN enhanced photocatalytic activity and cycling ability in comparison with individual CN significantly. It revealed a synergistic effect between the formation of Fe 3 O 4 -QDs and Co-doping. Results of characterization insight into the reason that Co-doped can regulate the band gap of CN, which has been proved by XPS and density functional theory (DFT). Moreover, the oxidation-reduction centre of Fe 3 O 4 -QDs with quantum effect can significantly boost the absorption of visible light and utilization electrons. Therefore, this work provides a broadening window for photo harvesting, charge using and separation during photocatalytic reactions.
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TALANTA
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2018
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IF 4.244
Ke Li Lin,Tong Yang,Hong Yan Zou,Yuan Fang Li,Cheng Zhi Huang
Here we first reported that graphitic carbon nitride nanosheet (g-C 3 N 4 NS) could effectively quench the chemiluminescence (CL) of luminol-hydrogen peroxide (H 2 O 2 ) system. According to the new discovery, a label-free and homogeneous CL aptasensing platform was designed for sensitive detecting of biomarkers. In the absence of target, DNA probe containing hemin/G-quadruplex DNAzyme structure was adsorbed on the surface of g-C 3 N 4 NS, causing the CL quenching of luminol through an electron transfer process. However, in the presence of the target, a DNA-DNA duplex was formed due to DNA hybridization reaction and target recognition effect, which could not be adsorbed onto the g-C 3 N 4 NS surface because of its weak affinity. Thus, the electron transfer was blocked and the CL emission of luminol could be enhanced. The proposed CL aptasensor could detect carcinoembryonic antigen (CEA) with a detection limit of 63.0 pg/mL and it can also be used as a general detecting strategy for adenosinetriphosphate (ATP) detection. This aptasensing platform exhibited high sensitivity toward biomarkers and the probe need not be labeled, showing great promise for disease diagnosis.
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PubMed
高影响因子
CHEMOSPHERE
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2018
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IF 4.427
Xiangjuan Yuan,Wenlei Qin,Xiaoman Lei,Lei Sun,Qiang Li,Dongya Li,Haiming Xu,Dongsheng Xia
A functional organic-metal composite material zero-valent zinc immobilized graphitic carbon nitride (ZVZ-g-C 3 N 4 ) was prepared by a fast and facile two-step synthetic approach with an optimal ZVZ content of 5.4 wt%. The structure, surface morphology and chemical composition of the as-synthesized ZVZ-g-C 3 N 4 were characterized by BET surface area, XRD, FT-IR, SEM, TEM , and XPS, respectively. ZVZ-g-C 3 N 4 composite exhibited superior catalytic ozonation activity with an improvement of 61.2% on atrazine (ATZ) degradation efficiency in 1.5 min reaction, more than 12 times of the pseudo-first-order rate constant, and almost 16-fold of the R ct value obtained in O 3 /ZVZ-g-C 3 N 4 process compared to O 3 alone. Meanwhile, the ATZ degradation efficiency was gradually enhanced with increasing ZVZ-g-C 3 N 4 dosage and initial solution pH in the range from 3.0 to 9.0, and a higher amount of ATZ was degraded when the initial concentration of ATZ rose from 1 to 10 mg L −1 . The enhanced catalytic ozonation activity of ZVZ-g-C 3 N 4 is attributed to the synergistic effects among ZVZ, ZnO and g-C 3 N 4 , as well as the improved dispersibility, increased surface area, and intensive electron-transfer ascribed to the electronic and surface properties modification. The radical scavengers experiments demonstrated that O 2 − , OH, and 1 O 2 were the dominant reactive radical species in the multifunctional processes. Moreover, an empirical kinetic model was proposed to predict ATZ degradation. The results indicated that the ZVZ-g-C 3 N 4 composite was a highly efficient, recoverable, and durable catalyst, which would provide a promising alternative in catalytic ozonation.
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PubMed
高影响因子
Nano Research
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2018
·Vol. 11
·期 5
·2450-2459
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IF 7.994
Zhang Bing,Zhao Tian-Jian,Feng Wei-Jie,Liu Yong-Xing,Wang Hong-Hui,Su Hui,Lv Li-Bing,Li Xin-Hao,Chen Jie-Sheng
The greenhouse effect and global warming are serious problems because the increasing global demand for fossil fuels has led to a rapid rise in greenhouse gas exhaust emissions in the atmosphere and disruptive changes in climate. As a major contributor, CO 2 has attracted much attention from scientists, who have attempted to convert it into useful products by electrochemical or photoelectrochemical reduction methods. Facile design of efficient but inexpensive and abundant catalysts to convert CO 2 into fuels or valuable chemical products is essential for materials chemistry and catalysis in addressing global climate change as well as the energy crisis. Herein, we show that two-dimensional fewlayer graphitic carbon nitride (g-C 3 N 4 ) can function as an efficient metal-free electrocatalyst for selective reduction of CO 2 to CO at low overpotentials with a high Faradaic efficiency of ~ 80%. The polarized surface of ultrathin g-C 3 N 4 layers (thickness: ~ 1 nm), with a more reductive conduction band, yields excellent electrochemical activity for CO 2 reduction.
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CHINESE JOURNAL OF CATALYSIS
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2018
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IF 3.525
Shafaq Sahar,Akif Zeb,Yanan Liu,Naseeb Ullah,Anwu Xu
We prepared the Fe 3 O 4 /g-C 3 N 4 nanoparticles (NPs) through a simple electrostatic self-assembly method with a 3:97 weight ratio to investigate their Fenton , photo-Fenton and oxidative functionalities besides photocatalytic functionality. We observed an improvement of the Fenton and photo-Fenton activities of the Fe 3 O 4 /g-C 3 N 4 nanocomposites . This improvement was attributed to efficient charge transfer between Fe 3 O 4 and g-C 3 N 4 at the heterojunctions, inhibition of electron-hole recombination, a high surface area, and stabilization of Fe 3 O 4 against leaching by the hydrophobic g-C 3 N 4 . The obtained NPs showed a higher degradation potential for rhodamine B (RhB) dye than those of Fe 3 O 4 and g-C 3 N 4 . As compared to photocatalysis , the efficiency of RhB degradation in the Fenton and photo-Fenton reactions was increased by 20% and 90%, respectively. Additionally, the horseradish peroxidase (HRP) activity of the prepared nanomaterials was studied with 3,3,5,5-tetramethylbenzidinedihydrochloride (TMB) as a substrate. Dopamine oxidation was also examined. Results indicate that Fe 3 O 4 /g–C 3 N 4 nanocomposites offers more efficient degradation of RhB dye in a photo-Fenton system compared with regular photocatalytic degradation, which requires a long time. Our study also confirmed that Fe 3 O 4 /g-C 3 N 4 nanocomposites can be used as a potential material for mimicking HRP owing to its high affinity for TMB. These findings suggest good potential for applications in biosensing and as a catalyst in oxidation reactions.
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Royal Society Open Science
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2018
·Vol. 5
·期 6
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IF 2.504
Cheng Wang,Liya Hu,Meiyin Wang,Bin Yue,Heyong He
A series of Cex-V-g-C3N4 catalysts with different cerium content were synthesized by a facile co-assembly method. Compared with pure V-g-C3N4 catalyst, the addition of cerium facilitated the high dispersion of vanadium species as well as the benzene adsorption ability of the corresponding catalysts. Also, the existence of cerium promoted the partial reduction of vanadium species, which improved the redox property of vanadium species as the active centres. The Cex-V-g-C3N4 catalysts showed considerably improved activity in the benzene hydroxylation reaction compared with V-g-C3N4 catalyst. Among the catalysts studied, Ce0.07-0.07 V-g-C3N4 exhibited the best catalytic activity with a benzene conversion of 33.7% and a phenol yield of 32.3% with good structural and catalytic stability, while only 24.7% of benzene conversion and phenol yield of 24.2% were obtained over 0.07 V-g-C3N4.
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ACS Sustainable Chemistry & Engineering
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2018
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IF 6.14
Yunyan Wu,Yazhou Zhou,Han Xu,Qinqin Liu,Yi Li,Lili Zhang,Hanqing Liu,Zhigang Tu,Xiaonong Cheng,Juan Yang
The goal of this paper is to develop a bactericidal photocatalyst silver/polydopamine/graphitic carbon nitride (Ag/PDA/g-C3N4) as a new type of antibacterial material with high activity, superstability, and excellent biocompatibility. Small Ag NPs (3.6–10.5 nm) disperse uniformly on the PDA-modified g-C3N4 sheets. This biophotocatalyst has excellent antibacterial activity against Escherichia coli, including low MIC100%Ag of 9.5 ppm and MBC100%Ag of 6.3 ppm but also a low cytotoxicity for human umbilical vein endothelial cells (HUVECs) because of biocompatible PDA. After 30 days in an air environment, only 0.18% of Ag+ was detected, which indicated the superstability of this biophotocatalyst compared with the state-of the-art antibacterial materials. The possible bactericidal mechanism is the synergistic effect between photocatalytic PDA-modified g-C3N4 and active Ag NPs. The Ag NPs themselves have strong antibacterial activity due to their small sizes. Importantly, under light irradiation, the surface plasmonic effect of Ag NPs and the incorporation of PDA enhance the photocatalytic activity of g-C3N4 significantly by increasing its light absorption, improving photoconductivity for photogenerated electrons and holes, and inhibiting their recombination. As a result, the sufficient radicals such as •OH and O2•– radicals can be formed. The radicals, particularly •OH, together with holes, can accelerate the death of bacteria through the destruction of biomolecules.
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APPLIED SURFACE SCIENCE
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2019
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IF 5.155
Sibo Chen,Mingli Li,Siyuan Yang,Xin Li,Shengsen Zhang
Graphitied carbon-coated bimetallic FeCu nanoparticles (FeCu@C) are fabricated by one-step method for the first time. The FeCu@C as novel cocatalysts of g-C 3 N 4 for improving visible-light photocatalystic hydrogen evolution . The FeCu@C as the cocatalyst of g-C 3 N 4 (FeCu@C/g-C 3 N 4 ) possess better photocatalyst activity (7.22 μmol h −1 ) than that of Fe@C (2.51 μmol h −1 ) and Cu@C (5.36 μmol h −1 ) nanoparticles. The highest photocatalytic activity of FeCu@C/g-C 3 N 4 can be attributed to the synergistic effect of the binary metals and the graphitied carbon layer. The bimetallic cocatalyst is not a simple combination of two metals, but a special electronic effect formed by the interaction between two metals. The Fe acts the catalytic activity center to capture photogenerated carries produced by g-C 3 N 4 , and agglomerates on the surface of FeCu alloys. Simultaneously, the coating of graphitied carbon layer can effectively enhance the stability of FeCu alloy and accelerate electron transfer . It is predicted that this work can provide new ideas and insights for the improvement of photocatalytic activity of semiconductors by non-precious alloy nanoparticles.
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