JOURNAL OF ALLOYS AND COMPOUNDS
·
2018
·
IF 3.779
Jirong Bai,Wenhua Lv,Zhijiang Ni,Zhilei Wang,Gang Chen,Haiyang Xu,Hengfei Qin,Zheng Zheng,Xi Li
MoS 2 /S-doped porous g-C 3 N 4 (MoS 2 /SPGCN) hybrids were fabricated via a facile calcination and ultrasound assembly method. Structural characterization indicated MoS 2 nanosheets were successfully loaded on SPGCN isotype heterojunction hybrids. The MoS 2 /SPGCN photocatalysts showed more visible light absorption, larger specific surface area, and faster electron-hole separation. MoS 2 /SPGCN significantly accelerated Rhodamine B photodegradation under visible light irradiation, which was mainly because the enriched active sites, broadened visible light absorption, and newly-formed heterojunction between MoS 2 nanosheets and SPGCN together suppressed the recombination of photoinduced electron-hole pairs. MoS 2 /SPGCN also showed excellent recyclability and chemical stability. Thus, this work presents a good strategy of designing efficient photocatalysts by substituting the single catalyst base with metal-free isotype heterojunction hybrids.
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2018
·
IF 5.667
Tianrong Zhan,Xia Tian,Guiyan Ding,Xien Liu,Lei Wang,Hongni Teng
We have developed a facile quaternarization strategy to an ultrathin lamellar g-C 3 N 4 ionic liquid nanostructure (IL-CNNS) via a nucleophilic substitution between the tertiary amino groups in tri- s -triazine subunits and n-butyl bromide. After functionalization, the obtained IL-CNNS composite exhibits the enhanced conductivity, dispersibility and stability owing to the formation of IL structure. This composite has been characterized by several spectroscopic techniques (FT-IR, XRD, XPS, TGA and TEM). The IL-CNNS modified electrode displays the larger effective surface area and the faster electron transfer rate, hence resulting in the superior electrocatalytic activity toward 2,4-Dichlorophenol (2,4-DCP). Under the optimal conditions, the proposed 2,4-DCP sensor gives rise to the wide linear range from 0.02 to 160 μM with a low detection limit (6.21 nM, S/N = 3) by amperometric method. The developed sensor has been applied to detect 2,4-DCP in water samples with satisfactory recoveries and stability. This quaternarization strategy may open up a new avenue to fabricate the layered carbon nitride IL nanostructure for electrochemical sensing applications.
✓ 已验证
产品关联
DOI
高影响因子
COMPOSITES PART B-ENGINEERING
·
2018
·
IF 4.92
Bo Song,Tingting Wang,Li Wang,Hu Liu,Xianmin Mai,Xiaojing Wang,Ning Wang,Yudong Huang,Yong Ma,Yang Lu,Evan K. Wujcik,Zhanhu Guo
Carbon fiber composite laminates were interfacially reinforced through in-situ synthesis of g-C 3 N 4 on the carbon fibers. The introduced g-C 3 N 4 greatly improved the roughness, functional groups and wettability on the carbon fiber surface and markedly enhanced the interfacial properties of composite laminates. The surface free energy of carbon fibers was increased by 67.81%. Interlaminar shear strength and interfacial shear strength of composite laminates were increased from 51.84 to 72.09 MPa and 44.62–73.41 MPa, respectively. The significantly enhanced interfacial properties enabled the mechanical performance of composite laminates to reach a superior state. Tensile strength and bending strength were increased by 19.54 and 10.51%, respectively. The total absorbed energy of impact experiment was also enhanced from 1.14 to 1.78 J. Meanwhile, dynamic mechanical properties and hydrothermal aging resistance were also ameliorated significantly. The improved interfacial properties and mechanical properties were ascribed to the increased mechanical interlocking, enhanced chemical bonding and ameliorated wettability created by g-C 3 N 4 .
✓ 已验证
产品关联
DOI
高影响因子
VACUUM
·
2018
·
IF 2.067
Fenglong Li,Xue Gu,Kun Zhang,Tat Thang Nguyen,Minghui Guo
Sustainable nanofibrillated cellulose (NFC) -based composites as advanced functional materials have attracted considerable attention for using in soft wearable electronic devices. In this work, a controllable one-pot method to fabricate NFC/g-C 3 N 4 composite film with different content of graphite carbon nitride (g-C 3 N 4 ) via vacuum-induced self-assembly (VISA) process has been presented. The composite film was constructed by electrostatic interaction/hydrogen bonding between NFC and g-C 3 N 4 coupled with vacuum-assisted filtration. The results demonstrated that the obtained NFC/g-C 3 N 4 composite film exhibited better specific capacitance. The high specific capacitance of 51 F g −1 at 1 mA cm −2 and 46 F g −1 at 1 mA cm −2 are achieved. The study provides a straightforward method of fabricating freestanding film as supercapacitor electrode, which have the potential in soft wearable electronic devices.
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2018
·
IF 4.439
Wei Lin,Kangchao Lu,Shijian Zhou,Jian Wang,Feihu Mu,Yun Wang,Yong Wu,Yan Kong
Excessive or deficient defects in graphitic carbon nitride (g-C 3 N 4 ) nanosheets are detrimental to their photocatalytic activities . In this work, the approach of fluorine-containing solvothermal treatment has been applied to remodel the defects in g-C 3 N 4 nanosheets (CNS). The fabrication process has been comprehensively investigated and the samples are characterized by various techniques. The results manifest that the solvothermal treatment declines the amount of defects, while the addition of fluorine stimulates the emergence of nitrogen vacancies for producing new active sites which makes the obtained fluorine modified CNS present excellent photocatalytic activities. The average rate of photocatalytic hydrogen evolution under visible light irradiation is 2607.4 μmol·h −1 ·g −1 , which is almost 13 and 1.3 times of bulk g-C 3 N 4 (BCN) and CNS, respectively, and the degradation rate of rhodamine B is about 3.4 and 1.9 times, respectively.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
·
2018
·
IF 4.841
Dongyao Wu,Jinze Li,Jingru Guan,Chongyang Liu,Xiaoxu Zhao,Zhi Zhu,Changchang Ma,Pengwei Huo,Chunxiang Li,Yongsheng Yan
An Intercalated heterostructural g-C 3 N 4 /TiO 2 /HNTs supported photocatalyst was successfully prepared via sol–gel and calcination methods. The introduction of HNTs and the g-C 3 N 4 -TiO 2 heterojunction effectively enhanced the charge transfer and separation efficiency of photogenerated electron–hole pairs, which endued the g-C 3 N 4 /TiO 2 /HNTs hybrid material with an outstanding photoelectric performance and good stability. And an obviously enhanced photocatalytic activity was exhibited by photodegrading ciprofloxacin compared with pure TiO 2 . Furthermore, the main active species were detected through trapping experiment and ESR spin-trap technique with DMPO, which confirmed that the O 2 − and the h + were the main active species in the photocatalytic system.
✓ 已验证
产品关联
DOI
高影响因子
Journal of Physical Chemistry C
·
2015
·
IF 4.772
Yuangang Li,Rongrong Wang,Huajing Li,Xiaoliang Wei,Juan Feng,Kaiqiang Liu,Yongqiang Dang,Anning Zhou
Co-Pi decorated TiO2@graphitic carbon nitrides (g-C3N4) nanorod arrays (denoted as CCNRs) with different mass ratios of g-C3N4 have been constructed on the FTO substrate through three processes, hydrothermal growth, chemical bath deposition and electrodeposition. First, TiO2 nanorod arrays were grown onto a FTO substrate by a hydrothermal method. Second, g-C3N4 was coated onto the TiO2 nanorod arrays by immersing the above substrate with TiO2 nanorod arrays into a solution of urea and then heated at higher temperature. In this procedure, the amount of the g-C3N4 on the TiO2 nanorod arrays can be controlled by tuning the concentration of the urea solution. At last, Co-Pi were decorated on the surface of the TiO2@g-C3N4 by electrodeposition. The as-prepared CCNRs were characterized by XRD, FESEM, TEM, XPS, UV–vis, and FTIR, respectively, which illustrated that Co-Pi moieties were successfully decorated on the hybrid TiO2@g-C3N4 nanorod arrays. Photoelectrochemical (PEC) measurements have demonstrated that the prepared CCNRs serve as an efficient and stable photoanode for PEC seawater splitting. The photocurrent density reaches 1.6 mA/cm2 under 100 mW/cm2 (AM1.5G) light illumination at 1.23 V (RHE). More significantly, the CCNRs photoanode is quite stable during seawater splitting and the performance remain undiminished even after 10 h continuous illumination. Finally, a systematical photocatalytic mechanism of the Co-Pi decorated TiO2@g-C3N4 was proposed, and it can be considered as potential explanation of enhanced PEC performance.
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2013
·Vol. 2
·期 7
·2071-2078
·
IF 0
Lin Zhang,Dengwei Jing,Xilin She,Hongwei Liu,Dongjiang Yang,Yun Lu,Jian Li,Zhanfeng Zheng,Liejin Guo
The formation of heterojunctions is an efficient strategy to extend the light response range of TiO2-based catalysts to the visible light region. In addition to the bandgap edge match between the narrow bandgap semiconductors and the TiO2 substrate, a stable phase interface between the sensitiser and TiO2 is crucial for the construction of heterojunctions, since it acts as a tunnel for the efficient transfer of photogenerated charges. Herein, the coincidence site density (1/Σ) of graphite-like carbon nitride (g-C3N4) nanoflakes and two types of TiO2 nanofibres [anatase and TiO2(B)] was calculated by near coincidence site lattice (NCSL) theory. It was found that the coincidence site density of g-C3N4 and TiO2(B) nanofibre with an exposed (001) plane is 3 times of that of the g-C3N4 and anatase nanofibre with exposed (100) plane. This indicated that the g-C3N4 nanoflakes are more favoured to form stable heterojunctions with TiO2(B) nanofibres. As expected, a stable phase interface was formed between the plane of (22–40) of g-C3N4 and the plane (110) of TiO2(B) which had same d-spacing of 0.35 nm and the same orientation. Under visible light irradiation, the photogenerated electrons could efficiently migrate to the TiO2(B) nanofibres from the g-C3N4 through the heterojunctions. So the g-C3N4/TiO2(B) system exhibited better photodegradation ability for sulforhodamine B (SRB) dye than the g-C3N4/anatase system, although the photoactivity of the anatase nanofibres was much better than that of the TiO2(B) nanofibres.
✓ 已验证
产品关联
DOI
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2014
·
IF 2.93
Junxian Wang,Jie Huang,Haolong Xie,Ailan Qu
A photocatalyst composed of graphite-like carbon nitride (g-C 3 N 4 ) and TiO 2 was fabricated by a simple method to calcine the mixture of melamine and TiO 2 precursor. The photocatalyst has enhanced photoactivity for hydrogen evolution from water. Characterization by XRD , FTIR, SEM and elemental analysis showed that the crystal structure and morphologies of composites were affected by the amount of melamine in the composite. The UV–Vis characterization displayed that the optical absorption range of g-C 3 N 4 /TiO 2 hybrid was broadened with a synergistic effect . The photoactivity for H 2 evolution was shown that the best result obtained from the composite with 67 wt% melamine has about 5 times improvement compared with bare TiO 2 or pure g-C 3 N 4 . The enhanced photoactivity might be related with the favorable structure resulted from heat-treatment temperature, and the content of g-C 3 N 4 participating in wide optical absorption, separation and transportation of electronic-holes, as well as morphology of composite.
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2015
·Vol. 5
·期 31
·24507-24512
·
IF 3.84
Qi Li,Yi He,Rufang Peng
Development of metal-free and environmentally friendly catalysts is of great significance for thermal decomposition of ammonium perchlorate (AP). In the present study, graphitic carbon nitride (g-C3N4) has been demonstrated to possess intrinsic catalytic activity for thermal decomposition of AP. Adding 10 wt% g-C3N4 to AP decreases the decomposition temperature by 70 °C and the activation energy (Ea) by 119.8 kJ mol−1. Moreover, the apparent decomposition heat of AP in the presence of 10 wt% g-C3N4 reaches up to 1362.6 J g−1, which is much higher than that of the pure AP (574.2 J g−1). Furthermore, a possible catalytic mechanism for the thermal decomposition of AP with g-C3N4 has been proposed. The unique surface structure of g-C3N4 consisting of triazine units connected by planar amino groups can be favourable for the adsorption and diffusion of perchloric acid via Lewis acid–base interactions, which decreases the reaction activation energy of AP and facilitates the formation of superoxide radical anions (˙O2−) and holes (h+), leading to the oxidation reaction of ammonia more completely in the catalytic decomposition of AP.
✓ 已验证
产品关联
DOI
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
·
2015
·
IF 3.453
Hui-Min Zhao,Chang-Miao Di,Lan Wang,Yuan Chun,Qin-Hua Xu
Mesoporous graphitic C 3 N 4 has been synthesized using a novel cross-linked bimodal mesoporous (CLBM) SBA-15 as a hard template. This cross-linked bimodal mesoporous SBA-15 template was prepared by adjusting the pH to alter the copolymer micelle size. The resulting mesoporous g -C 3 N 4 replicates the morphology of the mesoporous silica template, and numerous pore openings are formed on the surfaces. The mesoporous g -C 3 N 4 exhibits a high specific surface area and a large pore volume . The photocatalytic degradation activity of methyl orange on mesoporous g -C 3 N 4 is nearly 15.3 times as high as that on bulk- g -C 3 N 4 under visible light irradiation. The high photocatalytic performance of this sample is due to the high specific surface area and more readily accessible active sites.
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2015
·
IF 2.711
Liu Pi,Rui Jiang,Wangchi Zhou,Hua Zhu,Wei Xiao,Dihua Wang,Xuhui Mao
Converting the waste biomasses with high-carbon content into value-added materials is an environmental-friendly way for their utilization. In this study, a leaf-derived biochar is modified with graphitic C 3 N 4 to fulfill an affordable composite material capable of removing organic pollutants via adsorptive and photocatalytic processes simultaneously. The preparation process includes a carbonization process of chestnut leaf biomass and a followed condensation reaction of melamine at 520 °C. The characterization shows that biochar and C 3 N 4 existed in the composites in their pristine status, and the effective connection of C 3 N 4 and biochar was established. The adsorptive performance of the composites is governed by the biochar content in the composite, thus showing favorable performance for the removal of cationic dye methylene blue (MB). The condensation reaction of the melamine precursor has a coalescing effect on the dispersed biochar, resulting in the growth of particle size of composite. The composites prepared at different biochar/melamine ratios all show a photocatalytic activity on decolorization of MB. In terms of the specific photocatalytic activity of C 3 N 4 in the composite, biochar/melamine ratio of 0.5:1 is the best. Unlike the conventional adsorptive carbon materials which have saturated adsorption capacity, the composite in this study retain a sustaining decontamination capability due to the photocatalytic degradation of adsorbed organic pollutants under irradiation.
✓ 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）