JOURNAL OF MATERIALS SCIENCE
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2019
·Vol. 54
·期 10
·7834-7849
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IF 3.442
Dong Xuejun,Wu Keliang,Zhu Weifang,Wu Pengcheng,Hou Juan,Wang Zhaoxiong,Li Ran,Wu Jianning,Liu Zhiyong,Guo Xuhong
As a strong oxidizing pollutant, NO 2 can cause fire or even explosion. People living in atmosphere containing NO 2 for a long time will significantly affects human health. In this work, we developed a Schottky heterojunction sensor modified by g-C 3 N 4 quantum dots (g-C 3 N 4 QDs) and rGO deposited on TiO 2 nanotubes (TNTs) arrays. This sensor showed high response and extremely fast response/recovery time as well as excellent detection of ppb level of NO 2 at room temperature. TNTs were obtained using a one-step anodic oxidation process. TNTs were modified with g-C 3 N 4 QDs and rGO using quasi -CVD method and cyclic voltammetry during in situ electrodeposition, respectively. TNTs/g-C 3 N 4 QDs/rGO Schottky heterojunction sensor exhibited high sensitivity to 10 ppm of NO 2 (response equal to 15982) at room temperature. Below 15 ppb, sensing response also can reach 127. Sensor response was very fast and increased to 15982 in just 2 s when exposed to 10 ppm of NO 2 after which it recovers 90% within 1.16 s. This work clarified the influence of abundant oxygen vacancies (VO · ) in TNTs and photogenerated electrons on TNTs/g-C 3 N 4 QDs/rGO nanostructures as well as their sensing performances. Our experimental details demonstrated that Schottky barrier was established between TNTs and rGO, which was very beneficial for ppb-level NO 2 detection at room temperature.
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Nanomaterials
·
2019
·Vol. 9
·期 2
·215
·
IF 4.034
Shengqiang Zhang,Changsheng Su,Hang Ren,Mengli Li,Longfeng Zhu,Shuang Ge,Min Wang,Zulei Zhang,Lei Li,Xuebo Cao
The nanocomposite preparation procedure plays an important role in achieving a well-established heterostructured junction, and hence, an optimized photocatalytic activity. In this study, a series of g-C3N4/ZnO nanocomposites were prepared through two distinct procedures of a low-cost, environmentally-friendly, in-situ fabrication process, with urea and zinc acetate being the only precursor materials. The physicochemical properties of synthesized g-C3N4/ZnO composites were mainly characterized by XRD, UV–VIS diffuse reflectance spectroscopy (DRS), N2adsorption-desorption, FTIR, TEM, and SEM. These nanocomposites’ photocatalytic properties were evaluated in methylene blue (MB) dye photodecomposition under UV and sunlight irradiation. Interestingly, compared with ZnO nanorods, g-C3N4/ZnO nanocomposites (x:1, obtained from urea and ZnO nanorods) exhibited weak photocatalytic activity likely due to a “shading effect”, while nanocomposites (x:1 CN, made from g-C3N4and zinc acetate) showed enhanced photocatalytic activity that can be ascribed to the effective establishment of heterojunctions. A kinetics study showed that a maximum reaction rate constant of 0.1862 min-1can be achieved under solar light illumination, which is two times higher than that of bare ZnO nanorods. The photocatalytic mechanism was revealed by determining reactive species through adding a series of scavengers. It suggested that reactive ●O2−and h+radicals played a major role in promoting dye photodegradation.Keywords:ZnO nanorods;dye photodegradation;graphitic carbon nitride;nanocomposites;in situ synthesis
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RSC Advances
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2019
·Vol. 9
·期 8
·4635-4643
·
IF 3.049
Xiufang He,Zhansheng Wu,Yongtao Xue,Zhenzhen Gao,Xia Yang
Graphitic carbon nitride (g-C3N4) has been considered to be a promising metal-free photocatalyst, although the high recombination rate of charge carriers and poor absorption of visible light have limited its applications. In order to overcome these problems, an interlayer composite photocatalyst that comprised β-cyclodextrin (β-CD), oxygen-doped C3N4 (O-C3N4) and molybdenum disulfide (MoS2) was successfully constructed for the highly enhanced photodegradation of glyphosate in this study. The structure and morphology, optical properties, and photoelectrochemical properties of the prepared photocatalyst were characterized via a series of characterization techniques. The average fluorescence lifetime of the composite photocatalyst was extended from 6.67 ns to 7.30 ns in comparison with that of g-C3N4, which indicated that the composite photocatalyst enhanced the absorption of visible light and also inhibited the recombination of electron–hole pairs. The mass ratio of MoS2 that corresponded to O-C3N4/MoS2-5 enabled the highest removal rate under simulated sunlight irradiation, which was almost twice that achieved using pure g-C3N4. Relative species scavenging experiments revealed that ·O2− was the main species during the process of photodegradation. Besides, a toxicity test indicated that glyphosate became less toxic or non-toxic after photodegradation. This study provided an effective, feasible and stable photocatalyst driven by simulated sunlight irradiation for the highly enhanced photodegradation of glyphosate.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2019
·
IF 3.131
Nan Wang,Bin Han,Jianbo Wen,Mingwei Liu,Xinjun Li
A novel Mn-doped Fe 2 O 3 modified g-C 3 N 4 nanosheets composite has been prepared for overall water splitting. Structure characterizations reveal that the Mn are successfully doped in the Fe 2 O 3 nanoparticle and a close interface between g-C 3 N 4 and Mn-doped Fe 2 O 3 is obtained. The optimized FMC-10 photocatalyst has a H 2 evolution of 51 μmol h −1 . The improved photocatalytic performance can be ascribed to the synergy effect of both Mn-doped Fe 2 O 3 and g-C 3 N 4 . Doping Fe 2 O 3 with Mn promotes photo-induced charges and increases the charge transfer for the improved conductivity of the bulk Fe 2 O 3 , while favorable contacting with g-C 3 N 4 enhances the charge separation ability.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2019
·
IF 4.175
Wei Chen,Shu-Chang Wu,Zhi-Jun Xia,Guo-Bo Huang,Jun Hu
In this research, we rationally designed and synthesized quantum dots self-decorated SnIn 4 S 8 /g-C 3 N 4 (QDs-SISCN) nanocomposites by in situ anchoring quantum dot (QDs) self-decorated SnIn 4 S 8 (SIS) nanosheets onto the surface of mesoporous graphite carbon nitride (CN) nanosheets in a mixed solvothermal environment. The photoreduction of 4-nitroaniline (4-NA) was used to assess their photocatalytic activity. In this framework, the construction of CN nanosheets-supported QDs-decorated SIS homojunctions can integrate the advantages of both homojunctions and heterojunctions . Benefiting from those favourable properties, the QDs-SISCN nanocomposites exhibit superior photocatalytic activity towards 4-NA reduction under visible-light irradiation (λ > 400) as a result of the optimizied amount of CN nanosheets added. The recycling experiments also reveal high stability of the QDs-SISCN nanocomposites during photocatalytic reactions for 4-NA reduction. Moreover, the investigation of the photocatalytic mechanism from systematic characterizations, including measurements of the photocurrent response, electrochemical impedance spectroscopy (EIS) and photoluminescence (PL) indicate that the improved separation efficiency of charge carriers is a critical parameter for the enhanced photocatalytic activity for 4-NA reduction. We expect this research to provide a promising path to the design and synthesis of highly efficient hybrid photocatalysts for functional-group transformations.
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CHEMICAL ENGINEERING JOURNAL
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2019
·
IF 8.355
Chao Liu,ShanShan Dong,Yinguang Chen
Effective interface contact between components in heterojunction is crucial to realize high photocatalytic performance of photocatalyst. In this paper, the improvement of heterojunction contact by forming new ternary heterostructure via calcining the mixture of tetracycline and melamine to obtain the graphene-like carbon plane grafted g-C 3 N 4 and then coupling it with TiO 2 is reported. The unique carbon plane, which is anchored into g-C 3 N 4 basal domains, acts as a significant role to achieve the sufficient ternary heterojunction contact in the novel carbon plane/g-C 3 N 4 /TiO 2 nanostructure system. Under visible-light irradiation, the new ternary nanocomposite exhibits excellent photocatalytic activity for efficient removal of aqueous organic contaminants: methylene blue (98.6%), tetracycline (94.0%), and norfloxacin (95.3%), with the corresponding degradation rate constants of 0.0441, 0.0302, and 0.0125 min −1 , respectively, which are 54.1, 9.8, and 9.4 times higher than that of the pure g-C 3 N 4 . The mechanism study indicates that the excellent photocatalytic activity is attributed to the effective heterojunction, which can successfully extend visible-light absorption, promote charge separation efficiency, and suppress recombination of the photocatalytic electron-hole pairs. Moreover, the electron spin resonance (ESR) assay and radical scavenger experiments demonstrate that the photogenerated holes (h + ), superoxide anion radicals ( O 2 − ), and hydroxyl radical ( OH) play vital roles in photocatalytic degradation process. Importantly, this work may open up novel insights into the design of ternary heterostructure with highly efficacious photocatalytic performance, which suggests attractive applications in environment protection.
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Royal Society Open Science
·
2019
·Vol. 6
·期 7
·
IF 2.515
Xuecheng Liu,Qian Zhang,Liwei Liang,Lintao Chen,Yuyou Wang,Xiaoqing Tan,Li Wen,Hongyu Huang
CoO/g-C3N4 hybrid catalyst is facilely prepared for application to photocatalytic H2 evolution from water splitting by the vacuum rotation–evaporation and in situ thermal method. The physical and chemical properties of CoO/g-C3N4 are determined by a series of characterization methods. The g-C3N4 with 0.6 wt% Co loading exhibits superior photocatalytic hydrogen evolution activity with an H2 evolution amount of 23.25 mmol g−1 after 5 h. The obtained 0.6 wt% CoO/g-C3N4 can split water to generate 0.39 mmol g−1 H2 without sacrificial agent and noble metal, while the pure g-C3N4 is inactive under the same reaction conditions. The remarkable enhancement of photocatalytic H2 evolution activity of CoO/g-C3N4 composites is mainly ascribed to the effective separation of electron–hole pairs and charge transfer. The work creates new opportunities for the design of low-cost g-C3N4-based photocatalysts with high photocatalytic H2 evolution activity from overall water splitting.
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MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
·
2019
·
IF 2.722
Qian Zhang,Xin Gao,Yifei Wang,Hui Li,Yanlin Zhang,Yanping Fan,Jing Niu
Photocatalytic technologies capable of using solar energy for environmental restoration have much progressed with the increasing environmental concern. In this study, the ternary photocatalyst Ag 3 PO 4 /NG/g-C 3 N 4 conforming to the Z-scheme mechanism was prepared by a facile in-situ deposition method . Its morphology, chemical composition and optical property were determined by X-ray diffraction analysis, scanning electron microscopy, transmission electron microscope, Fourier transform infrared, X-ray photoelectron spectroscopy and UV–vis diffuse reflectance spectroscopy. Such photocatalyst (0.50 g/L loading) achieved the highest 93.6% degradation rate of tetracycline (TC), and 72% mineralization rate of TC comparing with single Ag 3 PO 4 (25% mineralization rate of TC). The detection of reactive oxidative species indicates that the photodegradation of TC is mainly caused by holes, O 2 − and OH. The synergistic effect of Ag 3 PO 4 , nitrogen-doped graphene (NG) and g-C 3 N 4 in the composite accelerates the separation and migration of photogenerated carrier via a solid electron mediator NG , and simultaneously inhibits the photo-corrosion of Ag 3 PO 4 , thereby improving the photo-stability of the ternary photocatalyst.
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APPLIED SURFACE SCIENCE
·
2018
·
IF 4.439
Gaoyuan Long,Jiafeng Ding,Lihong Xie,Runze Sun,Mengxia Chen,Yanfang Zhou,Xiuying Huang,Gaorui Han,Yajun Li,Weirong Zhao
Chlorophenols (CPs) have been considered as a kind of priority environmental pollutants for their potential detrimental effects, and photocatalytic reduction dechlorination tend to be a promising approach to CPs’ removal. In this work, 2,4-dichlorophenol (2,4-DCP) was adopted as the model pollutant of CPs, and a simple mixing and heating method was employed to prepare graphitic carbon nitride and bismuth tungstate (g-C 3 N 4 /Bi 2 WO 6 ) binary photocatalysts. Under UV–vis light irradiation and anoxic atmosphere, the g-C 3 N 4 /Bi 2 WO 6 samples exhibited enhanced photocatalytic activities. The optimal dechlorination rate constant of 2,4-DCP over g-C 3 N 4 /Bi 2 WO 6 (weight ratio 3:7) was 1.13 h −1 , 7.6 and 8.9 times higher than that of pristine g-C 3 N 4 and Bi 2 WO 6 respectively. The enhanced activities originated from the effective suppression of charge recombination and extended spectrum absorption range. Kinetic studies revealed that the dechlorination processes followed the pseudo-first-order model. The photocatalytic mechanism of 2,4-DCP over g-C 3 N 4 /Bi 2 WO 6 was discussed in detail, and based on which, a mediator-free Z-scheme mechanism was proposed. This work extends the application range of g-C 3 N 4 /Bi 2 WO 6 photocatalyst and provides a new insight into environmental remediation.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2018
·
IF 11.698
Zhou Peng,Lai Jianping,Tang Yonghua,Chao Yuguang,Lin Fei,Guo Shaojun
The building of an optimized interface between the cocatalyst and the photoactive materials is significant for understanding the charge transfer mechanism and designing high-performance catalysts at atomic level, however, still a great challenge. Herein, we develop a new method to synthesize a class of hybrid photocatalyst by coupling amorphous FeCoPO x nanowires (FeCoPO x (NWs)) to g -C 3 N 4 photocataysts (denote as FeCoPO x (NWs)-C 3 N 4 ) for greatly boosting the photocatalytic activity, which shows 3.5-fold higher H 2 -production activity than the state-of-art crystalline FeCoPO y nanoparticles/ g -C 3 N 4 hybrid photocataysts (denote as FeCoPO y (NPs)-C 3 N 4 ). The structure analysis by X-ray absorption fine structure (XAFS) reveals that the Fe species in FeCoPO x (NWs)-C 3 N 4 owns a lower coordination number than that in FeCoPO y (NPs)-C 3 N 4 , which can contribute to the formation of strong interface between FeCoPO x (NWs) and g -C 3 N 4 . The first-principles simulation confirms that the amorphous FeCoPO x (NWs) not only can build a stable interface with g -C 3 N 4 by forming more Fe-N bonds, but also own an optimized electronic properties for enhancing electron transfer from g -C 3 N 4 to FeCoPO x (NWs). The strong interfacial electronic effect of FeCoPO x (NWs)-C 3 N 4 contributes to its high H 2 -production activity.This work not only develops a new method to prepare the high-performance low-cost cocatalyst as Pt alternative for H 2 production, but also provide a new insight into optimizing the interface between cocatalyst and photocatalyst for photocatalytic reaction.
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Journal of Materials Chemistry C
·
2018
·Vol. 6
·期 46
·12660-12667
·
IF 5.976
Lan Mu,Liyi Shi,Yanqin Wang,Qianfan Zhou,Jinhong Ye,Xin Feng
Functional nanopaper based on cellulose nanofibrils (CNF) has attracted growing interest due to its renewability, biodegradability and enhanced printability. In this study, we developed novel transparent and luminescent nanopaper with excellent mechanical flexibility by grafting graphitic carbon nitride (g-C3N4) nanosheets with TEMPO-mediated oxidation CNF (TCNF) using a pressured extrusion paper-making technique. The carboxyl groups on the TCNF surface acting as active sites are covalently cross-linked with –NH2 or –NH groups of g-C3N4 nanosheets via EDC/NHS coupling chemistry, and then the g-C3N4@TCNF nanopaper with heterogeneous network structures is finally assembled. The hybrid nanopaper combines the advantages of TCNF and g-C3N4, exhibiting outstanding transparency and luminescent properties. Moreover, the transparent luminescent nanopaper possesses excellent thermal stability and mechanical flexibility. The intelligent design of high-performance nanopaper based on TCNF grafted with g-C3N4 nanosheets provides a potential strategy for applications in the easily identifiable and difficult-to-copy anti-counterfeiting fields.
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ANALYTICA CHIMICA ACTA
·
2018
·
IF 5.123
Xing-Pei Liu,Jing-Shuai Chen,Chang-jie Mao,He-Lin Niu,Ji-Ming Song,Bao-Kang Jin
Herein, we established a novel ultrasensitive photoelectrochemical biosensor for detecting urokinase-type plasminogen activator (u-PA), based on a g-C 3 N 4 /CdS nanocomposite. The prepared nanocomposite was characterized by transmission electron microscopy, X-ray photoelectron spectroscopy, ultraviolet–visible absorption spectroscopy , and Fourier transform infrared spectroscopy , thus indicating that the nanocomposite was prepared successfully. In the typical process, the prepared nanocomposite was deposited on the surface of a bare FTO electrode. After being air-dried, the g-C 3 N 4 /CdS nanocomposite modified electrode was successively incubated with antibody against urokinase-type plasminogen activator and the blocking agent BSA to produce a photoelectrochemical biosensor for u-PA. In the presence of target u-PA antigen, the photocurrent response of the prepared biosensor electrode decreased significantly. The proposed novel photoelectrochemical biosensor exhibited good sensitivity, specificity, and reproducibility for u-PA detection, and a low detection limit of 33 fg mL −1 , ranging from 1 μg mL −1 –0.1 pg mL −1 . The proposed strategy should provide a promising method for detection of other biomarkers.
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