GREEN CHEMISTRY
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2013
·Vol. 15
·期 9
·2525-2531
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IF 6.828
Dongshun Deng,Yang Yang,Yutong Gong,Yi Li,Xuan Xu,Yong Wang
Palladium nanoparticles supported on a mesoporous graphitic carbon nitride, Pd@mpg-C3N4, has been developed as an effective, heterogeneous catalyst for the liquid-phase semihydrogenation of phenylacetylene under mild conditions (303 K, atmospheric H2). A total conversion was achieved with high selectivity of styrene (higher than 94%) within 85 minutes. Moreover, the spent catalyst can be easily recovered by filtration and then reused nine times without apparent lose of selectivity. The generality of Pd@mpg-C3N4 catalyst for partial hydrogenation of alkynes was also checked for terminal and internal alkynes with similar performance. The Pd@mpg-C3N4 catalyst was proven to be of industrial interest.
研究领域:
化学工程
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催化科学
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DOI
高影响因子
PHOTOCHEMISTRY AND PHOTOBIOLOGY
·
2018
·Vol. 95
·期 2
·501-511
·
IF 2.214
Shukun Le,Wenjing Li,Yue Li,Burenbayaer Borjigin,Guangshe Li,Xiaojing Wang
Ag 3 VO 4 /mpg-C 3 N 4 (mesoporous graphitic carbon nitride) heterojunction photocatalysts were prepared by anchoring tiny Ag 3 VO 4 particles on the nanosheet of mpg-C 3 N 4 . The prepared Ag 3 VO 4 /mpg-C 3 N 4 heterojunctions were used to remove tetracycline (TC), a kind of antibiotics widely released into the aquatic environment under solar irradiation. Compared with pure mpg-C 3 N 4 and Ag 3 VO 4 , Ag 3 VO 4 /mpg-C 3 N 4 displayed much higher photocatalytic activity (83.2% removal rate within 90 min under visible-light irradiation). Importantly, no apparent deactivation was observed for Ag 3 VO 4 /mpg-C 3 N 4 -40 after five cycles, inferring a good reusability. As confirmed by photocurrent measurement and photoluminescence spectra, the excellent photocatalytic property of Ag 3 VO 4 /mpg-C 3 N 4 was credit to the electron–hole separation enhancement at the formed heterojunction of two semiconductors. In addition, a possible mechanism and intermediate products for the Ag 3 VO 4 /mpg-C 3 N 4 photocatalysts toward the photodegradation of TC in aqueous solution under artificial sunlight radiation were proposed based on the scavengers trapping test, ESR spectra and a high-performance liquid chromatography (HPLC) coupled with mass spectrometer (MS) analysis. This investigation provides a low cost, green and easily practical approach to remove the antibiotics in the aquatic environment.
研究领域:
环境科学
·
材料科学
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产品关联
DOI
PubMed
高影响因子
EUROPEAN JOURNAL OF ORGANIC CHEMISTRY
·
2024
·
IF 2.5
Fumeng Yin,Shan Hu,Shuwei Zhu,Shifeng Xing,Hongjun Zhu
Graphical Using mesoporous graphitic carbon nitride (mpg-C 3 N 4 ) as a metal-free heterogeneous photocatalyst was developed for thiocyanation of alkenes under visible light irradiation with oxygen as green oxidant and without any other additives. The present protocol has excellent functional group tolerance and the desired tetrasubstituted alkenyl thiocyanides were obtained in moderate to good yields. Moreover, the recyclable mpg-C 3 N 4 catalyst could be used at least 6 times without significant loss of activities. Using mesoporous graphite carbon nitride (mpg-C 3 N 4 ) as metal-free heterogeneous catalyst, the thiocyanation of ketene dithioacetals was achieved under visible light irradiation with oxygen as green oxidant and without any other additives. The present protocol has excellent functional group tolerance and the desired tetrasubstituted alkenyl thiocyanides were obtained in moderate to good yields. Moreover, the recyclable mpg-C 3 N 4 catalyst could be used at least 6 times without significant loss of activities. A series of mechanistic validation experiments indicated that the reaction involves a radical process.
研究领域:
有机化学
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催化化学
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DOI
高影响因子
Journal of Environmental Chemical Engineering
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2020
·
IF 4.3
Xing Chen,Xu-Xu Ke,Yao Liu,Rohan Weerasooriya,Heng Li,Yu-Cheng Wu
Chromium readily undergoes redox speciation, and Cr(VI) oxidation state is ubiquitous and mobile in the environment. Under physiological conditions, Cr(VI) reduction yields species as Cr(V) or Cr(VI), which shows reactivity towards DNA damaging. Therefore, accurate detection of Cr species in the environmental compartment is of utmost importance. In compliance with green chemistry, Au/mpg-C 3 N 4 nanocomposites were successfully fabricated by ultra-violet photo-reduction without a reducing agent. The Au/mpg-C 3 N 4 nanocomposites were characterized by scanning electron microscope (SEM), X-ray diffractometry (XRD), X-ray photoelectron spectrometry (XPS), and infrared spectrophotometry. Well-dispersed gold nanoparticles with an average diameter of 50 nm decorated on mpg-C 3 N 4 . We developed a method to determine Cr(VI) with excellent sensitivity (0.002196 μA/ppb) and detection limit (14.7 ppb) using Au/mpg-C 3 N 4 modified glassy carbon working electrode by linear sweep voltammetry (LSV). The same electrode can use in real-time Cr(VI) monitoring using amperometry. The new sensor is stable and free from interferences from other species in natural water, and it can also be used in real-time Cr(VI) monitoring over wide concentration ranges.
研究领域:
环境科学
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材料科学
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分析化学
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产品关联
DOI
高影响因子
Scientific Reports
·
2017
·Vol. 7
·期 1
·1-8
·
IF 4.259
Zhang Yifeng,Liu Yixin,Li Rongxia,Saddam Khan Malik,Gao Picheng,Zhang Yong,Wei Qin
Herein, a novel label-free photoelectrochemical (PEC) immunosensor based on SnS 2 @mpg-C 3 N 4 nanocomposite is fabricated for the detection of prostate specific antigen (PSA) in human serum. Firstly, mesoporous graphite-like carbon nitride (mpg-C 3 N 4 ) with carboxyl groups is synthesized successfully which possesses high specific surface area and large pore volume. Then, SnS 2 as a typical n-type semiconductor with weak photoelectric conversion capability is successfully loaded on carboxylated mpg-C 3 N 4 to form a well-matched overlapping band-structure. The as-synthesized SnS 2 @mpg-C 3 N 4 nanocomposite performs outstanding photocurrent response under visible-light irradiation due to low recombination rate of photoexcited electron-hole pairs, which is transcend than pure SnS 2 or pure mpg-C 3 N 4 . It is worth noting that SnS 2 @mpg-C 3 N 4 nanocomposite is firstly employed as the photoactive material in PEC immunosensor area. The concentration of PSA can be analyzed by the decrease in photocurrent resulted from increased steric hindrance of the immunocomplex. Under the optimal conditions, the developed PEC immunosensor displays a liner photocurrent response in the range of 50 fg·mL −1 ~ 10 ng·mL −1 with a low detection limit of 21 fg·mL −1 . Furthermore, the fabricated immunosensor with satisfactory stability, reproducibility and selectivity provides a novel method for PSA determination in real sample analysis.
研究领域:
分析化学
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生物传感器
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纳米技术
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医学诊断
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DOI
高影响因子
RSC Advances
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2015
·Vol. 5
·期 80
·64976-64982
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IF 3.84
Shuaishuai Ma,Jinjuan Xue,Yuming Zhou,Zewu Zhang,Zhilan Cai,Daibao Zhu,Shuang Liang
A facile hard template approach has been developed to prepare mpg-C3N4/TiO2 composites using SiO2 nanoparticles as a hard template and cyanamide as a precursor. The samples have been well characterized using X-ray diffraction (XRD), energy-dispersive X-ray spectroscopy (EDS), transmission electron microscopy (TEM), and ultraviolet-visible diffuse reflectance spectroscopy (UV-vis DRS). The results demonstrate that TiO2 nanoparticles sized 5–10 nm were distributed on the surface of mpg-C3N4 to form the mpg-C3N4/TiO2 heterojunction photocatalyst. In this way, the mpg-C3N4/TiO2 heterojunction catalyst has a porous structure and large surface area, which increases the contact area for pollutants. Rhodamine B (RhB) was used as a representative organic pollutant to evaluate the photocatalytic activity of the samples under visible light irradiation. The results show that the as-prepared mpg-C3N4/TiO2 heterojunction catalyst has a significantly enhanced visible light photocatalytic activity compared to pure mpg-C3N4 and that the degradation rate was 1.6 times higher than that of pure mpg-C3N4. The increased photocatalytic activity of the mpg-C3N4/TiO2 heterojunction catalyst can be attributed to the formation of the heterojunction between mpg-C3N4 and TiO2, which suppresses the recombination of photoinduced electron–hole pairs. Furthermore, based on systematic characterization and discussion, a possible photocatalytic mechanism for the excellent photocatalytic performance was proposed.
研究领域:
材料科学
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环境科学
·
化学
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产品关联
DOI
高影响因子
WATER SCIENCE AND TECHNOLOGY
·
2020
·Vol. 80
·期 11
·2206-2217
·
IF 1.638
Li Dan,Liu Heng,Niu Chaoqun,Yuan Jiren,Xu Feigao
It was found that mesoporous graphite carbon nitride (mpg-C 3 N 4 ) prepared using melamine as the precursor and ammonium chloride as the bubble template, has good photocatalytic activity under visible light irradiation. In order to improve the photocatalytic performance of mpg-C 3 N 4 , it was combined with metal-organic framework ZIF-8. Taking tetracycline hydrochloride (TC) solution as a model pollutant, the photocatalytic activity of composites was studied to select the optimal composite ratio and pH value. The initial concentration of hydrogen peroxide and active oxidation species were also investigated. The results showed that when the loading of ZIF-8 was 40 wt%, the removal efficiency was the best and 74.8% of TC could be removed. The degradation efficiency of TC was negatively affected under extreme pH conditions, but the composite photocatalyst mpg-C 3 N 4 -ZIF-8 had a relatively higher degradation efficiency on TC at mild pH values (4–8). The removal efficiency was the best at pH 8, and 75.1% of TC could be removed; the adsorption capacity was 430.7 mg·g −1 and the photodegradation capacity was 548.6 mg·g −1 . The order of active species affecting the photocatalytic degradation of TC by mpg-C 3 N 4 -ZIF-8 was hole > superoxide radical > hydroxyl radical.
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2020
·
IF 4.65
Xing Chen,Yao Liu,Xu-Xu Ke,Rohan Weerasooriya,Heng Li,Lian-Chao Wang,Yu-Cheng Wu
Methylated mercury is a bio-magnifier that readily crosses the blood-brain barrier exerting neurotoxic effects. Therefore, the development of a rapid and in situ method of methylmercury (CH 3 Hg + ) detection is research priority. We report a sensitive electrochemical method for the detection of CH 3 Hg + using a modified glassy carbon electrode with Au nanoparticles-graphitic carbon nitride (AuNPs/mpg-C 3 N 4 ). The AuNPs/mpg-C 3 N 4 nanocomposites was synthesized by photochemical method and characterized by X-ray diffraction (XRD), Scanning electron microscope (SEM), Transmission electron microscope (TEM), X-ray photoelectron spectroscopic (XPS), Fourier transform infrared spectrometer (FTIR). The results showed that Au nanoparticles were successfully loaded on the surface of mpg-C 3 N 4 and dispersed uniformly. AuNPs/mpg-C 3 N 4 combined the excellent catalytic properties of AuNPs and unique structure of mpg-C 3 N 4 to improve the electrochemical sensing performance of CH 3 Hg + . The AuNPs/mpg-C 3 N 4 GCE show a high sensitivity for CH 3 Hg + determination using Differential pulse stripping voltammetry (DPSV). The CH 3 Hg + calibration curve is linear within 1 μg/L ∼25 μg/L. The sensitivity and detection limit of CH 3 Hg + is 0.285 μA/μg −1 L and 0.103 μg/L (S/N = 3), respectively. The Hg 2+ shows chemical interference in CH 3 Hg + detection, which is minimized by the addition of SnCl 2 or Diethylene triamine pentaacetic acid (DTPA). We also determined the CH 3 Hg + concentration of natural waters with a ±106% spike recovery. A newly developed AuNPs/mpg-C 3 N 4 modified GCE sensor provides a promising platform for CH 3 Hg + detection in natural water.
研究领域:
环境科学
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分析化学
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材料科学
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产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2016
·
IF 4.803
Dandi Zhou,Min Wang,Jing Dong,Shiyun Ai
The rapid and sensitive detecting technique for subgroup J of avian leukosis viruses (ALVs-J) needs to be developed as soon as possible in order to not only reduce economic losses but also ensure the food safety. In this paper, a novel electrochemical immunosensor was built based on mesoporous graphitic carbon nitride (mpg-C 3 N 4 ). Mpg-C 3 N 4 was used as the sensor platform to bond with the primary antibodies (Ab 1 ). The compound of thionine and mpg-C 3 N 4 (Th-mpg-C 3 N 4 ) was synthesized for the first time to serve as the electroactive probe as well as the carrier of secondary antibodies (Ab 2 ). Compared to bulk g-C 3 N 4 , mpg-C 3 N 4 possesses larger specific surface area, smaller electrochemical resistance and abundant active sites. So the proposed electrochemical immunosensor exhibited amplified detective signals which realized the sensitive detection of ALVs-J. Under the opitimized conditions, the immunosensor exhibited outstanding analytical performance for the detection of ALVs-J whose titer ranged from 10 2.08 to 10 4.0 TCID 50 /mL (TCID 50 : 50% tissue culture infective dose) with a low detection limit of 120 TCID 50 /mL (S/N = 3). The sensitivity of the immnosensor was 6.15 μA/(TCID 50 /mL). This high sensitive immunosensor also displayed good selectivity, reproducibility and stability. Last but not least, this new strategy may be of great promise for clinic application in the future.
研究领域:
生物医学工程
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免疫学
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病毒学
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分析化学
·
纳米生物技术
✓ 已验证
DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2021
·
IF 6.165
Shaoxiu Li,Chan Lai,Changhui Li,Jintang Zhong,Zhifeng He,Qiuyi Peng,Xi Liu,Bohan Ke
A new magnetic dual Z-scheme heterostructure photocatalyst, consisting of mesoporous graphitic carbon nitride (mpg-C 3 N 4 ), BiOBr, polythiophene (PTh), and magnetic iron oxide, was developed, and its structural, optical, and electrochemical properties were analyzed. The photocatalyst was employed for the degradation of dimethyl phthalate (DMP) in water under visible light to evaluate its photocatalytic activity. The results revealed that the photocatalytic activity of the new heterostructure photocatalyst was superior to that of its single-component counterparts. The reaction kinetics of photocatalytic DMP degradation followed pseudo first-order kinetics and the reaction rate constant was 3.7- and 4.5-fold higher than those of pristine g-C 3 N 4 and BiOBr, respectively. The enhanced photocatalytic performance was chiefly attributed to the dual Z-scheme heterostructure generated between mpg-C 3 N 4 , PTh, and BiOBr, which effectively hindered the recombination of photogenerated electron and hole pairs in mpg-C 3 N 4 and BiOBr, improving the photogenerated carrier transfer efficiency. Radical trapping test results indicated that the active species, h + , ·O 2 – , and ·OH, coexisted during the photocatalytic reaction process, and that h + played a major role in the destruction of DMP molecules. DMP was degraded into intermediate small-molecule products, such as acids and alcohols, which were ultimately mineralized to CO 2 and H 2 O. The magnetic property of the new heterostructure photocatalyst enabled its straightforward separation from water using magnetic separation technology for further reuse. This study provides a new material and method for the effective removal of DMP from aqueous solution.
研究领域:
环境科学
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材料科学
·
化学工程
·
光催化
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产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL
·
2014
·
IF 3.679
Zhongkui Zhao,Hongling Yang
The selective hydrogenation of nitroarenes to their corresponding aryl amines has been investigated over the supported nickel propoted tungsten carbide catalyst on polymeric mesoporous graphitic carbon nitride (Ni–W 2 C/mpg–C 3 N 4 ) in the presence of Lewis acid. The Ni–W 2 C/mpg–C 3 N 4 is demonstrated much higher catalytic activity and selectivity for the selective hydrogenation of nitrobenzene than the supported Ni–W 2 C catalyst on activated carbon (Ni–W 2 C/AC) and mesoporous carbon (Ni–W 2 C/CMK-3), and the developed Ni–W 2 C/mpg–C 3 N 4 also exhibits excellent catalytic properties for the selective hydrogenation of various substrates comprising the extra reducible functionalized groups besides nitro group to diverse functionalized arylamines, industrially important compounds, offering more than 92% of yield with 100% selectivity, which may be ascribed to the strengthened mass transfer by using mesoporous support, intentified synergistic effect between Ni–W 2 C/mpg–C 3 N 4 and Lewis acid owing to the basicity of mpg-C 3 N 4 , as well as the improved reducibility of NiO-WO 3 and the dispersion of Ni–W 2 C. It can be also found that the developed catalyst could be easily recovered by filtration and recycled many times without visible loss in its catalytic performance. The significantly improved catalytic properties of supported Ni–W 2 C catalyst fabricated by using mpg-C 3 N 4 as a superior carrier in the presence of Lewis acid allows it to be a promising candidate for the clean and highly-efficient synthesis of diverse functionalized arylamines through the selectivie hydrogenation of substituted nitroarenes.
研究领域:
催化化学
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材料科学
·
有机合成
·
绿色化学
·
纳米材料
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）