ELECTROCHIMICA ACTA
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2017
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IF 4.798
Yujuan Xu,Wu Lei,Juan Su,Jinjin Hu,Xiaodan Yu,Tong Zhou,Yun Yang,Daniel Mandler,Qingli Hao
A fast, ultrasensitive electrochemical sensing platform based on graphitic carbon nitride-electrochemically deposited-poly(3,4-ethylenedioxythiophene) (g-C 3 N 4 -E-PEDOT) composite was constructed by in-situ electropolymerization and applied for the quantitative determination of acetaminophen (AP). E-PEDOT was introduced as the conducting matrix for developing g-C 3 N 4 composite to complement the poor conductivity disadvantage of g-C 3 N 4 . The strong affinity and synergetic effect between g-C 3 N 4 and E-PEDOT, which were analyzed by PM6 computational calculation, highly improved the electron transfer property and remarkably enhanced the electrochemical catalytic activity of the composite. The g-C 3 N 4 -E-PEDOT modified glassy carbon electrode (GCE) demonstrated better electrocatalytic activity towards the oxidation of AP than bare, g-C 3 N 4 and E-PEDOT modified ones. Under the optimized conditions, the oxidation peak currents at the g-C 3 N 4 -E-PEDOT/GCE increased linearly in the concentration range of AP from 0.01 to 2 μM and 2–100 μM, and an ultra-low limit of detection (LOD) of 34.28 nM was obtained (S/N = 3). In addition, the g-C 3 N 4 -E-PEDOT/GCE was successfully applied for the AP determination in the clinical human serum, and also exhibited excellent selectivity, reproducibility and stability. Except the novel AP determination approach, moreover, this work provided a new electrochemical application angle of graphitic carbon nitride theoretically as well as experimentally.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2016
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IF 3.205
Yuanzhi Hong,Zhenyuan Fang,Bingxin Yin,Bifu Luo,Yong Zhao,Weidong Shi,Changsheng Li
The photocatalytic water splitting for generation of clean hydrogen energy has received increasingly attention in the field of photocatalysis . In this study, the Ta 2 O 5 /g-C 3 N 4 heterojunctions were successfully fabricated via a simple one-step heating strategy. The photocatalytic activity of as-prepared photocatalysts were evaluated by water splitting for hydrogen evolution under visible-light irradiation (λ > 420 nm). Compared to the pristine g-C 3 N 4 , the obtained heterojunctions exhibited remarkably improved hydrogen production performance. It was found that the 7.5%TO/CN heterojunction presented the best photocatalytic hydrogen evolution efficiency, which was about 4.2 times higher than that of pure g-C 3 N 4 . Moreover, the 7.5%TO/CN sample also displayed excellent photochemical stability even after 20 h photocatalytic test. By further experimental study, the enhanced photocatalytic activity is mainly attributed to the significantly improve the interfacial charge separation in the heterojunction between g-C 3 N 4 and Ta 2 O 5 . This work provides a facile approach to design g-C 3 N 4 -based photocatalyst and develops an efficient visible-light-driven heterojunction for application in solar energy conversion .
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MATERIALS RESEARCH BULLETIN
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2016
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IF 2.435
Ailan Qu,Xinmei Xu,Haolong Xie,Yangyu Zhang,Yuyu Li,Junxian Wang
A composite of graphitic carbon nitride and TiO 2 (g-C 3 N 4 /TiO 2 ) with enhanced photocatalytic hydrogen evolution capacity was achieved by calcining melamine and TiO 2 sol-gel precursor. Characterization results reveal that heating temperature had a great influence on the structure, surface area and properties of the composites. Compared with the polycondensation of pure melamine, the presence of TiO 2 precursor can promote the formation of melon at a low temperature. The highest photocatalytic activity of g-C 3 N 4 /TiO 2 (400) was achieved when the calcination was performed at 400 °C, exhibiting H 2 production rate of 76.25 μmol/h under UV–vis light irradiation (λ > 320 nm) and 35.44 μmol/h under visible light irradiation (λ > 420 nm). The highest photocatalytic performance of g-C 3 N 4 /TiO 2 (400) can be attributed to: (1) the strong UV–vis light absorption due to the narrow bandgap caused by synergic effect of TiO 2 and g-C 3 N 4 , (2) high surface area and porosity, (3) the effective separation of photo-generated electron-holes owing to the favorable heterojunction between TiO 2 and g-C 3 N 4 .
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JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL
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2016
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IF 3.958
Kainan Song,Feng Xiao,Lijuan Zhang,Fan Yue,Xiaoyu Liang,Jide Wang,Xintai Su
A hybrid nanomaterial comprising of one-dimensional W 18 O 49 nanowires grown on two-dimensional g-C 3 N 4 sheets was prepared by a facile solvothermal process. Photocatalytic activity of these materials for H 2 generation under visible light was evaluated. The optimum efficiency of W 18 O 49 /g-C 3 N 4 composite photocatalyst at a mass content of 30% was up to 4.5 times as high as that of the pure g-C 3 N 4 . The significantly enhanced performance of W 18 O 49 /g-C 3 N 4 composites was mainly attributed to the synergistic effect between the interface of W 18 O 49 nanowires and g-C 3 N 4 sheets, involving stronger light absorption in the visible range, faster transfer and more efficient separation of the photo-generated electron-hole pairs. In short, the W 18 O 49 /g-C 3 N 4 hybrid nanomaterial was demonstrated to be an effective photocatalyst for H 2 production.
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APPLIED SURFACE SCIENCE
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2016
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IF 3.15
Kui Li,Feng-Yun Su,Wei-De Zhang
Carbon quantum dots (CQDs) were deposited onto graphite-like carbon nitride nanosheets (CNNS) to form CNNS/CQDs composites. The prepared CNNS/CQDs composites exhibit much higher photocatalytic activity under visible light irradiation than pure CNNS do. The CNNS/CQDs-7 sample displays the highest photocatalytic performance, with H 2 production rate of 116.1 μmol h −1 , which is three times of that over pure CNNS (37.8 μmol h −1 ). Photoluminescence spectroscopy and photoelectrochemical (PEC) analysis reveal that the CQDs are favorable for trapping electrons and promoting the separation of photogenerated electron-hole pairs in CNNS. A possible photocatalytic mechanism of the enhanced photocatalytic performance for H 2 generation over CNNS/CQDs will be proposed in this paper.
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JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
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2017
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IF 2.625
Qin Chen,Huijie Hou,Danwei Zhang,Shaogang Hu,Tao Min,Bingchuan Liu,Changzhu Yang,Wenhong Pu,Jingping Hu,Jiakuan Yang
The ZnO/g-C 3 N 4 photocatalyst was prepared by ball milling and demonstrated enhanced photocatalytic degradation of RhB under visible light irradiation. The photocatalyst is consisted of ZnO and g-C 3 N 4 heterojunctions formed by the shear stress during the mechanical treatment. The addition of g-C 3 N 4 can improve the photocatalytic performance of ZnO under visible light. The heterojunction formed between ZnO and g-C 3 N 4 decreased the recombination rate of photogenerated carriers and improved the photocatalytic activity of the ZnO/g-C 3 N 4 hybrids. The optimal ZnO/g-C 3 N 4 photocatalyst with 10 wt% g-C 3 N 4 showed a degradation efficiency of 51.3% for RhB under visible light, which is 2.1 times higher than that of pristine ZnO. The electron paramagnetic resonance (EPR) measurement showed that the OH radicals are the dominant active species in photocatalytic process under both full solar spectrum and visible light irradiation. And the OH radical generation is much more efficient under full solar spectrum than that under visible light due to the UV response of ZnO. This work provides a simple method for the design and preparation of novel heterojunction photocatalysts.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2017
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IF 3.582
Li Liu,Panru Hu,Wenquan Cui,Xingang Li,Zisheng Zhang
A novel visible-light-active CdS@g-C 3 N 4 photocatalyst was synthesized via a chemisorption method. This core@shell structure catalyst exhibited enhanced photocatalytic H 2 production activity under visible-light (λ ≥ 420 nm) irradiation. The nano-sheet g-C 3 N 4 was successfully coated on CdS nanoparticles with intimate contact. When the content of g-C 3 N 4 in the hybridized composite is 3 wt. %, the hydrogen-production rate of the CdS@g-C 3 N 4 is 2.5 and 2.2 times faster than pure CdS and bulk g-C 3 N 4 , respectively. Superior stability was also observed in the cyclic runs. The improvement in stability and activity result from the ability of the π-conjugated g-C 3 N 4 material in transporting photo-induced holes. The core@shell structure promoted separation of the photo-generated electron-hole pair and accelerated the emigration speed of the hole from the valence band of CdS. This effect also results in a greatly improved amount of hydrogen production . The possible mechanism for the photocatalytic activity and stability of CdS@g-C 3 N 4 are tentatively proposed.
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ACS Applied Materials & Interfaces
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2016
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IF 7.145
RongQin Ye,HuaBin Fang,Yan-Zhen Zheng,Nan Li,Yuan Wang,Xia Tao
A novel direct Z-scheme CoTiO3/g-C3N4 (CT-U) photocatalytic system with different weight percentage of CoTiO3 was synthesized using a facile in situ growth method for H2 evolution from water splitting. The as-prepared CT-U composites composed of 1D CoTiO3 microrod and 2D g-C3N4 nanosheet were characterized by various techniques including XRD, SEM, TEM, XPS, FTIR, and UV–vis. Results demonstrate that the CT-U composite photocatalysts were successfully fabricated, with intimate interfacial contact and heterojunction interaction between g-C3N4 and CoTiO3 which can significantly boost the photocatalytic activity compared with prinstine g-C3N4 and CoTiO3. The most enhanced H2-evolution rate of 858 μmol h–1 g–1 and high quantum efficiency (38.4% at 365 nm, 3.23% at 420 ± 20 nm) are achieved at an optimal 0.15% CT-U. Meanwhile, the 0.15% CT-U sample exhibits good photocatalytic stability in recycling H2 evolution. Accordingly, direct Z-scheme mechanism capable of leading efficient charge carrier separation and strong reduction ability for enhanced H2 production was proposed, and further evidenced by PL, photoelectrochemical analysis, and ESR assay.
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PubMed
高影响因子
ACS Applied Materials & Interfaces
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2016
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IF 7.145
Yafei Zhao,Ruoyan Wei,Xin Feng,Lining Sun,Panpan Liu,Yongxiang Su,Liyi Shi
Ultrathin graphite-like carbon nitride (g–C3N4) nanosheets have attracted considerable attention due to the enhanced intrinsic photoabsorption and photoresponse with respect to bulk g–C3N4. For the first time, a dual-mode of down- and upconversion luminescent g–C3N4 nanopaper with high optical transparency and mechanical robustness was successfully fabricated through a simple thermal evaporation process using chitosan as a green cross-linking agent. The dual-mode of down- and upconversion fluorescence emission originated from the amino terminated ultrathin g–C3N4 nanosheets functionalized with carboxylic acid modified multicolored rare-earth upconversion nanoparticles (cit–UCNPs) via EDC/NHS coupling chemistry. The homogeneously distributed cit–UCNPs@g–C3N4 nanoconjugates with excellent hydrophilicity displayed good film-forming ability and structural integrity; thus, the photoluminescence of each ingredient was substantially maintained. Results indicated that the freestanding chitosan cross-linked cit–UCNPs@g–C3N4 luminescent nanopaper possessed high transmittance, excellent mechanical properties, and remarkable dual-mode emission. The smart design of high performance luminescent nanopaper based on ultrathin g–C3N4 nanosheets grafted with multicolored UCNPs offers a potential strategy to immobilize other multifunctional luminescent materials for easily recognizable and hardly replicable anticounterfeiting fields.
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RSC Advances
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2017
·Vol. 7
·期 4
·2333-2341
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IF 3.108
Yanfang Yang,Jingjing Chen,Zhiyong Mao,Na An,Dajian Wang,Bradley D. Fahlman
Ultrathin graphitic carbon nitride (g-C3N4) nanosheets were synthesized via thermal exfoliation of bulk urea-derived g-C3N4 under an argon atmosphere. As a visible-light responsive photocatalyst, this material exhibits a much superior photocatalytic activity in pollution degradation and H2 evolution than bulk g-C3N4, as a result of the extended region of visible light response and the enhanced surface area of ultrathin g-C3N4 nanosheets. These findings may provide a promising and facile approach to the design of high-performance photocatalysts.
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Molecular Catalysis
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2017
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IF 0
Feng-Yun Su,Wei-De Zhang
Relatively narrow visible light responsive region and high recombination probability of photogenerated charge carriers are the main barriers that limit the photocatalytic activity of graphitic carbon nitride (g-C 3 N 4 ). In this study, modified g-C 3 N 4 was synthesized by adding minor amount of ethylenediaminetetraacetic acid (EDTA) into urea as precursors for subsequent thermal polymerization. The thermal intermediate product ethylenediaminetetramethylene (EDTM) during decarboxylation of EDTA was grafted to the framework of g-C 3 N 4 by connecting adjacent 3,s-triazine units. The special chelate structure of EDTA leads to the distortion of g-C 3 N 4 to a nonplanar structure, which is responsible for extending the light harvesting around 500 nm, and consequently promoting the generation, separation and transfer of charge carriers. The H 2 evolution rate on an optimized EDTM-grafted g-C 3 N 4 photocatalyst (UCN-10) reaches 116.4 μmol h −1 , which is about 3.5 times of that on the pristine g-C 3 N 4 (UCN). The formation process of the grafted structure and the mechanism for the enhanced photocatalytic H 2 evolution over UCN-10 were proposed based on experimental results.
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Desalination and Water Treatment
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2024
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IF 1
Chaoliang Wang,Xiaoyang Zhao,Yongjun Li,Dehu Yang,Fuyang Liu,Feng Liu,Li Li,Ping Ke
A series of simple and low-cost Ca-doped g-C 3 N 4 (Ca/CN-X) photocatalysts were fabricated through a two-step calcination method for photodegradation of methylene blue (MB) simulated dyeing wastewater. The results showed that the photodegradation efficiency of Ca/CN-15 % on MB removal under visible light was 97.7 %, and the degradation rate constant was 4 times that of CN, showing the best photocatalytic performance. This was attributed to the fact that the doping of Ca expanded the absorption band edge, reduced the band gap, and suppressed the photogenerated electron-hole recombination, thereby increasing its corresponding photocatalytic activity. A possible photodegradation mechanism was explored, and it was found that h + was the main active species during the process. The above indicated that Ca/CN-X can be regarded as a promising catalyst for dyeing wastewater treatment.
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