APPLIED SURFACE SCIENCE
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2019
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IF 5.155
Huiqin Wang,Jingru Guan,Jinze Li,Xin Li,Changchang Ma,Pengwei Huo,Yongsheng Yan
In this work, the ordered mesoporous CeO 2 (m-CeO 2 ) was successfully fabricated via the nanocasting pathway, through using SBA-15 as a hard template. Besides, g-C 3 N 4 /Ag/m-CeO 2 composite was successfully constructed by calcination method. Meanwhile, the obtained samples were investigated by series of test techniques. The XRD, SEM and TEM results show that the m-CeO 2 and Ag/m-CeO 2 with the ordered mesoporous trait. Besides, the EPR, Raman and XPS results suggest that the oxygen vacancies (O v ) and Ce 3+ and Ce 4+ are in g-C 3 N 4 /Ag/m-CeO 2 . In addition, the ordered mesostructure is favorable for the CO 2 molecular movement and adsorption/desorption reaction. The g-C 3 N 4 nanosheets, a promising material possessing suitable conductor band, large specific area, non-toxicity, and outstanding chemical stability, is a candidate semiconductor for CO 2 conversion. The introduction of g-C 3 N 4 nanosheets to Ag/m-CeO 2 overcomes the photocorrosion of Ag nanoparticles and Ag facilitate the transfer of photogenerated electrons. The photocatalytic activity results show that when the loading of Ag is 7 wt%, the g-C 3 N 4 /7Ag/m-CeO 2 composite exhibits the superiority activity for CO 2 photoconversion to CO (13.94 μmol/g) and CH 4 (7.39 μmol/g) under UV-irradiation in 10 h.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2019
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IF 4.084
Ziqian Gao,Longlong Wang,Lei Wang,Jingwei Huang,Houde She,Qizhao Wang
Construction of heterostructured photocatalysts is a feasible method for improving hydrogen production from water splitting because of its good charge transport efficiency. Herein, we coupled the Ti-MOFs (TiATA) with metal-free graphitic carbon nitride (g-C 3 N 4 ) to synthesize composites, g-C 3 N 4 @TiATA, in which a heterostructure was formed between g-C 3 N 4 and TiATA. The establishment of heterojunctions not only broadens the light absorption range of g-C 3 N 4 @TiATA (490 nm) by contrast with g-C 3 N 4 (456 nm), but also greatly accelerates charge migration. Photocatalytic studies present that the construction of heterostructure steering the charges flow from g-C 3 N 4 to TiATA and then delivery to the cocatalyst of Pt nanoparticles , exhibiting an impressively photocatalytic hydrogen production rate (265.8 μmol·h −1 ) in assistance of 300 W Xenon lamp, which is about 3.4 times as much as g-C 3 N 4 /Pt.
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Catalysts
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2018
·Vol. 8
·期 4
·147
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IF 3.465
Xiaoyu Chang,Junjiao Yang,Dandan Han,Bing Zhang,Xu Xiang,Jing He
Light-driven production of hydrogen peroxide (H2O2) is a green and sustainable way to achieve solar-to-chemical energy conversion. During such a conversion, both the high activity and the stability of catalysts were critical. We prepared an Au-supported C3N4catalyst—i.e., Au/C3N4-500(N2)—by strongly anchoring Au nanoparticles (~5 nm) onto a C3N4matrix—which simultaneously enhanced the activity towards the photosynthesis of H2O2and the stability when it was reused. The yield of H2O2reached 1320 μmol L−1on Au/C3N4-500(N2) after 4 h of light irradiation in an acidic solution (pH 3), which was higher than that (1067 μmol L−1) of the control sample Au/C3N4-500(Air) and 2.3 times higher than that of the pristine C3N4. Particularly, the catalyst Au/C3N4-500(N2) retained a much higher stability. The yield of H2O2had a marginal decrease on the spent catalyst—i.e., 98% yield was kept. In comparison, only 70% yield was obtained from the spent control catalyst. The robust anchoring of Au onto C3N4improved their interaction, which remarkably decreased the Au leaching when it was used and avoided the aggregation and aging of Au particles. Minimal Au leaching was detected on the spent catalyst. The kinetic analyses indicated that the highest formation rate of H2O2was achieved on the Au/C3N4-500(N2) catalyst. The decomposition tests and kinetic behaviors of H2O2were also carried out. These findings suggested that the formation rate of H2O2could be a determining factor for efficient production of H2O2.Keywords:hydrogen peroxide;Au catalyst;photosynthesis;carbon nitride
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高影响因子
APPLIED SURFACE SCIENCE
·
2018
·
IF 4.439
Xueqi Geng,Shuai Chen,Xiang Lv,Wei Jiang,Tianhe Wang
Novel g-C 3 N 4 /Bi 5 O 7 I heterojunction microspheres having excellent photocatalytic activity were successfully prepared by a one-pot ethylene glycol (EG)-assisted hydrothermal method followed by calcination in air. Bi 5 O 7 I microspheres grafted with g-C 3 N 4 nano-sheets were formed and studied by electron microscopy. The morphological effects on g-C 3 N 4 /Bi 5 O 7 I photocatalytic capability with varied g-C 3 N 4 contents were investigated and discussed. The g-C 3 N 4 /Bi 5 O 7 I microspheres exhibited much improved photocatalytic degradation performance under visible light irradiation compared with bare Bi 5 O 7 I and g-C 3 N 4 . The preparation conditions of g-C 3 N 4 /Bi 5 O 7 I microspheres with optimal photocatalytic ability for degrading methyl orange (MO) and rhodamine (RhB) were established. Analyses by both photoluminescence (PL) and photocurrent independently confirmed that photo-induced electron-hole pairs in the g-C 3 N 4 /Bi 5 O 7 I composite have been effectively created which was responsible for the observed photocatalysis. Based on the analysis of the experiment results, a Z-Scheme heterojunction photocatalytic mechanism was proposed. The excellent photocatalytic performance could be attributed to the effective charge separation at the interface between g-C 3 N 4 and Bi 5 O 7 I and the enhanced visible light absorption. In addition, the photocatalytic mechanism was discussed on the basis of the relative band positions of these two semiconductor materials.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2019
·
IF 14.229
Shujun Chen,Wangyang Lu,Haibin Shen,Shasha Xu,Xia Chen,Tiefeng Xu,Yu Wang,Yi Chen,Yan Gu,Chun Wang,Xiao-Feng Wu,Matthias Beller,Wenxing Chen
The comfortable, beautiful and healthy residential environment has been a target pursued by human beings. However, the inevitable presences of indoor air pollutants such as nicotine which release from tobacco smoking imperceptibly invade people's health. Here, we developed new pigments consisted by colorful graphitic carbon nitride (g-C 3 N 4 )-based catalysts, which were fabricated by facile calcining and water bath refluxing procedures. The catalytic pigments exhibited a high catalytic activity for the removal of nicotine under sunlight or even light emitting diode (LED). The designed experiments revealed that superoxide radicals ( O 2 − ) were main active species in g-C 3 N 4 -based catalysts system and played a significant role in removing contaminants. Noteworthy, the catalysts as pigments were successfully used for coloring textiles and painting. Both the catalytic textiles and paintings were provided with preferably photocatalytic performance and reusability. The catalytic pigments were simple to prepare, brightly colored and could effectively degrade nicotine, thus not only have decorative effect, enriching the spiritual world, but also contribute to the protection of the environment of human life.
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NANOTECHNOLOGY
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2019
·Vol. 30
·期 31
·315601
·
IF 3.399
Shiping Sun,Erchuang Fan,Hongliang Xu,Wenbo Cao,Gang Shao,Bingbing Fan,Hailong Wang,Rui Zhang
Modified g-C3N4 samples (g-X, where X corresponds to the number of hours of acid treatment of the melamine) with outstanding photocatalytic performance were prepared by using hydrochloric acid-treated melamine as a precursor and calcining at 550 °C for 2 h. An x-ray diffractometer, field-emission scanning electron microscope, infrared spectrometer, N2 adsorption–desorption test, x-ray photoelectron spectroscopy, and ultraviolet–visible diffuse–reflectance spectroscopy analysis were carried out to characterize the phase composition, microstructure, chemical structure, specific surface area (SSA), chemical states, elemental composition and optical properties of the samples, respectively. The photocatalytic performance of the samples was evaluated by degrading the Rhodamine B (RhB) aqueous solution. The results showed that the crystal structure and vibration bands of melamine changed due to the reaction with hydrochloric acid. The crystallinity and grain size of g-C3N4 in g-X (X = 1, 2, 4, 6, 8, 10) reduced, and the SSA values of g-X increased compared to that of the g-0 sample, which was synthesized from pristine melamine. The g-X samples exhibited excellent photocatalytic activity towards degradation of RhB compared to g-0. The photocatalytic activity of the g-X samples increased gradually as the acid treatment time of the melamine increased from 1 h to 2 h, and then decreased gradually with the extension of the acid treatment time. The rate constant (k) values of g-X are higher than that of g-0. g-2 presented the highest rate constant (k = 0.052 min−1), which was 5.5 times higher than that of g-0. The improved photocatalytic activity of the g-X samples was attributed to the higher SSA value, the appearance of surface defects, the outstanding photo-carrier separation efficiency and stronger light harvesting ability of g-X, with the last two factors being more significant. Acid treatment of melamine is helpful in the preparation of high performance g-C3N4 photocatalyst, and the microstructure and photocatalytic performance of g-C3N4 were affected significantly by the acid treatment time.
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PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2018
·
IF 4.439
Lu Tan,Chongfei Yu,Miao Wang,Senyan Zhang,Jingyu Sun,Shuying Dong,Jianhui Sun
The g-C 3 N 4 -agar hybrid aerogel was obtained by a heating-cooling polymerization process with agar and g-C 3 N 4 powder as the raw material, which showed outstanding adsorption properties due to its three-dimensional network structure. Under the synergistic effect of adsorption and photocatalytic degradation, the hybrid aerogels could effectively remove organic pollutants from wastewater. The g-C 3 N 4 -agar hybrid aerogels could adsorb the methylene blue molecules to the surface of the photocatalyst, but the adsorption capacity decreases with the decrease of agar content. In addition, the optical absorption and photocurrent response show remarkable improvement with respect to g-C 3 N 4 -agar hybrid aerogels as compared with that of bare g-C 3 N 4 photocatalyst. The optimized 60% g-C 3 N 4 -agar sample exhibited preferable simulated-sunlight photocatalytic degradation efficiency towards the dye and antibiotic pollutants, as well as excellent recycle performance. Such a g-C 3 N 4 -agar hybrid aerogel could be envisaged to possess great potentials in practical wastewater treatment.
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高影响因子
CHEMICAL PHYSICS LETTERS
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2018
·
IF 1.686
Yunde Fan,Ji Zhou,Jin Zhang,Yaqin Lou,Zhenwu Huang,Yong Ye,Li Jia,Bin Tang
Graphite-like carbon nitride (g-C 3 N 4 ) nanosheets have been facilely assembled via electrostatic interaction onto cotton fabrics for achieving multi-functionalities. The surface morphologies, chemical composition and optical features of the g-C 3 N 4 -coated fabrics were characterized. The treated cotton fabrics exhibited remarkable photocatalytic degradation activity and superior self-cleaning performance. A complete degradation of Rhodamine B (RhB) and removal of stains were accomplished under simulated sunlight irradiation. More importantly, the modified fabrics can be reused in catalysis reactions with great durability. The practical treatment approach demonstrated from this work has great potential to be applied in textile industry for functional fabrics manufacture.
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高影响因子
APPLIED SURFACE SCIENCE
·
2014
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IF 2.538
Si-Zhan Wu,Kui Li,Wei-De Zhang
Heterostructured photocatalysts Ag 3 VO 4 /g-C 3 N 4 were prepared by deposition-precipitation method in order to anchor Ag 3 VO 4 on the surface of N-vacancy g-C 3 N 4 (g-C 3 N 4 -VN). The photocatalytic activity of the samples was evaluated by degrading rhodamine B (RhB) in aqueous solution. Compared with the pure Ag 3 VO 4 and g-C 3 N 4 -VN, the heterojuncted photocatalyst 65 wt% Ag 3 VO 4 /g-C 3 N 4 -VN exhibits the best activity under visible light irradiation. The photodegradation rate constant of 65 wt% Ag 3 VO 4 /g-C 3 N 4 -VN is 0.0556 min −1 , which is 23.4, 5.8 and 6.4 times of that of pure Ag 3 VO 4 , pure g-C 3 N 4 -VN and P25, respectively. The excellent photocatalytic performance of the Ag 3 VO 4 /g-C 3 N 4 -VN catalysts can be ascribed to the matched band structures of Ag 3 VO 4 and g-C 3 N 4 , which strengthened the formation of the heterojuncted photocatalyst. The unique heterostructured photocatalyst is favorable for retarding the recombination of photogenerated electrons and holes, thus the photocatalytic activity is significantly increased. Further experiment also reveals that the •O 2 − and h + are the major active species in the degradation of RhB.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
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2014
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IF 4.058
Yipeng Zang,Liping Li,Xiaoguo Li,Rui Lin,Guangshe Li
A series of novel composites g -C 3 N 4 /SnO 2 were first synthesized using a facile two-step process. Through systematic sample characterization, it is demonstrated that all composites consist of two components: g -C 3 N 4 with a low specific surface area and SnO 2 nanoparticles with a large specific surface area. Within the composites, component of SnO 2 nanoparticles dispersed well onto the component g -C 3 N 4 with a clear interface between each other. The interactions between both components are strong, as confirmed by variations in binding energies and lattice parameters. A synergistic collaboration is achieved for the composites, as contributed by surface adsorption of organics from π–π conjugation of component g -C 3 N 4 , improved separation efficiency of photo-generated carriers from interfacial interactions between both components, and increased surface area from component SnO 2 nanoparticles. As a consequence, these composites exhibit a significantly enhanced photocatalytic activity towards MO degradation under visible light irradiation. The optimum photocatalytic performance is achieved at 47.5 wt% SnO 2 , showing a reaction kinetic constant of 0.0078, which is much higher than those of components g -C 3 N 4 and SnO 2 . With the unique synergistic collaboration, the optimized composite with Pt additives is also successfully applied to high-efficiency production of hydrogen from water splitting under visible light irradiation.
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高影响因子
ChemCatChem
·
2014
·Vol. 6
·期 12
·3419-3425
·
IF 5.044
Yongliang Liao,Shenmin Zhu,Jun Ma,Zhihua Sun,Chao Yin,Chengling Zhu,Xianghong Lou,Di Zhang
Graphical Shaping graphitic nitrides: Synthesis of graphitic carbon nitride (g-C 3 N 4 ) and tailoring of its morphology was performed through adjustment of the molar ratio of melamine to urea, their self-assembly by hydrogen bonding and ionic interactions, and calcination. We report a novel method for the preparation of graphitic carbon nitride (g-C 3 N 4 ) with various morphologies through self-assembly and calcination, which starts from the raw materials melamine, urea, and cyanuric acid. The hollow to wormlike morphologies of g-C 3 N 4 could be readily tailored by adjusting the molar ratio of melamine to urea; with increase in the molar ratio from 3:1 to 1:3, a morphology transformation was observed. The morphologies were tailored by self-assembly of the aggregates by hydrogen bonding and ionic interactions. Correspondingly, an increased BET surface area from 49.6 to 97.4 m 2 g −1 was observed. If used as a photocatalyst in degrading rhodamine B (RhB) under visible-light irradiation, these g-C 3 N 4 samples demonstrated 7 to 13 times higher performance than conventional bulk g-C 3 N 4 . The high performance was attributed to the unique morphology that provided not only high specific surface area but low recombination losses of photogenerated charges.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
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2016
·
IF 5.31
Yuanzhi Hong,Changsheng Li,Guangyi Zhang,Yadong Meng,Bingxin Yin,Yong Zhao,Weidong Shi
The removal of pollutant using photocatalysis technology has received much attention due to the increasing serious environmental contamination. In this study, novel Nb 2 O 5 /g-C 3 N 4 heterojunctions were fabricated via a facile one-step heating strategy for the first time. Compared to pure g-C 3 N 4 and Nb 2 O 5 , the as-prepared Nb 2 O 5 /g-C 3 N 4 samples exhibited remarkably enhancing photocatalytic activity for degradation of tetracycline hydrochloride (TC-HCl) both under visible and simulated solar light irradiation. It was found that the 3% Nb 2 O 5 content of heterojunction (3%NO/CN) showed the highest photocatalytic efficiency for TC-HCl degradation, which is about 2.9-fold and 2.4-fold higher than that of pristine g-C 3 N 4 under visible and simulated solar light irradiation, respectively. In addition, the 3%NO/CN sample not only displayed excellent photocatalytic recyclability, but also can efficiently remove TC-HCl even under strong acidic condition (pH = 1). Moreover, the 3%NO/CN heterojunction also exhibited dramatically enhancement of photocatalytic activity for degradation of other fluoroquinolones antibiotic, such as ciprofloxacin (CIP) and levofloxacin (LEV). The highly enhancing photoactivity was attributed to the formation of a heterojunction between g-C 3 N 4 and Nb 2 O 5 , which could greatly suppresses the photogenerated electron–hole pair’s recombination. The active species trapping and ESR experiments indicated that superoxide radicals and holes are the major active species in which contributing to the photocatalytic process. This work will bring about potential application in treatment of antibiotic pollutant and solar energy conversion.
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