SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Zhenhua Niu,Wenjia Luo,Peng Mu,Jian Li
Membrane separation technology has received widespread attention in the field of gas separation because of small footprint, convenient operation and low energy consumption. However, membranes separation are subject to a trade-off between permeance (or permeability) and selectivity. Herein, a novel kind of supported oinic liquid membrane (SILM) was constructed by nanoconfined 1-ethyl-3-methylimidazole acetate ([EMIm][AcO], IL) in the two-dimentional (2D) channels of the g-C 3 N 4 laminated membrane for CO 2 /N 2 and CO 2 /CH 4 separation. Due to the nanoconfinement of ILs in 2D g-C 3 N 4 laminated membrane and the appropriate nanofluidic channels constructed by the g-C 3 N 4 nanosheets, the as-prepared g-C 3 N 4 SILM possesses outstanding permeance and selectivity for CO 2 in separation of CO 2 /N 2 and CO 2 /CH 4 . The experimental result shows that g-C 3 N 4 SILM possesses maximum CO 2 permeance of 992.97 GPU in separation of CO 2 /N 2 and 1160.52 GPU in separation of CO 2 /CH 4 under 1 bar, 25℃. Meanwhile the resultant g-C 3 N 4 SILM shows excellent selectivity for CO 2 /N 2 (52.49) and CO 2 /CH 4 (48.41) respectively. Moreover, the resulted g-C 3 N 4 SILM displays excellent thermal stability and durability. After 60 h test, its separation performance has no obvious change. The findings of our study demonstrate that nanoconfined the IL into the 2D g-C 3 N 4 is a novel strategy for the preparation of high-performance supported liquid membrane for the separation of CO 2 /N 2 and CO 2 /CH 4 .
研究领域:
材料科学
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环境科学
·
化学工程
✓ 已验证
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2019
·
IF 3.131
Jihua Huang,Jinyuan Liu,Jia Yan,Chengjuan Wang,Ting Fei,Haiyan Ji,Yanhua Song,Cheng Ding,Chengbao Liu,Hui Xu,Huaming Li
Deposition of metal nanoparticles into pore could be regarded as promising strategy for promoting photocatalytic performance because it could enrich active species in limited space. Here, we deposited typical metal cocatalysts (Pt, Ag, Ni) within the pore of mesoporous graphitic carbon nitride (MPCN) via multiple vacuum-induced method. Through a series of characterization analysis of the obtained M (M = Pt, Ag, Ni)/MPCN composites, it could be confirmed that the metal nanoparticles successfully entered into the pore of MPCN . Further exploring the photocatalytic activity, the results indicate that the electrons enrichment-effect composites exhibits higher hydrogen production than physical blending composites, which is attributed to the metal nanoparticles grown and dispersed evenly within the confined mesoporous space, promoting effectively enrichment of photogenerated electron and improving the photocatalytic performance. Thereby, to investigate the metal nanoparticles deposited within the confined pore of MPCN for improving the photocatalytic performance is necessary.
研究领域:
材料科学
·
环境科学
·
化学
✓ 已验证
DOI
高影响因子
CATALYSIS LETTERS
·
2025
·Vol. 155
·期 5
·1-16
·
IF 2.4
Bai Yang,Chen Zhongxiang,Gu Deng,Wang Ren,He Jianing
The Surface Plasmon Resonance (SPR) effect and the construction of Z-scheme heterojunctions are critical for enhancing photocatalytic rates. Herein, a composite material composed of a Z-scheme heterojunction structure, AgInS 2 /g-C 3 N 4 (AIS/GCN), was developed and further optimized through the modification of Ag nanoparticles (Ag NPs). The SPR effect of Ag NPs significantly improved the electron transfer characteristics of GCN, leading to enhanced separation efficiency of electron-hole pairs. By leveraging the advantages of the Z-scheme heterojunction, the composite not only effectively enhanced charge carrier separation but also improved light absorption and increased the density of active catalytic sites. To evaluate the photocatalytic degradation efficiency of Rhodamine B (RhB) and the photoreduction efficiency of Cr (VI) using the Ag/AIS/GCN nanocomposite, a systematic characterization analysis was conducted. The results demonstrated that the degradation rate and photoreduction efficiency of the Ag NPs-modified AIS/GCN Z-scheme heterojunction composite were 5.30 times and 7.22 times higher than those of pure GCN, the TOC removal rate of the sample reached 56.19%. The incorporation of Ag NPs and AIS significantly enhanced light energy utilization efficiency, increased the number of surface-active sites, and improved charge carrier transport rates. This study illustrates that the combination of the SPR effect and Z-scheme heterojunction construction markedly enhances the efficiency and stability of the photocatalyst, indicating the broad potential applications of this composite in dye purification and heavy metal removal. Graphical
研究领域:
材料科学
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环境科学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2019
·Vol. 125
·期 1
·1-11
·
IF 1.784
Deng Senlin,Yang Zebin,Lv Guojun,Zhu Yongqiang,Li Haichao,Wang Fumin,Zhang Xubin
A novel WO 3 nanosheets (WO 3 NS)/g-C 3 N 4 Nanosheets’ (g-C 3 N 4 NS) nanocomposite photocatalyst was fabricated through a simple calcination process. WO 3 NS was first prepared with the aid of P123 lamellar micelles and g-C 3 N 4 NS was synthesized by two-step calcination process. The nanocomposite photocatalyst was characterized by X-ray powder diffraction, scanning electron microscopy, Fourier transform infrared spectrometry, UV–Vis diffuse reflection spectroscopy, X-ray photoelectron spectroscopy, and photoluminescence. The novel nanocomposite photocatalyst demonstrated higher photocatalytic activity for rhodamine B degradation than corresponding g-C 3 N 4 NS. 20 wt% WO 3 NS/g-C 3 N 4 NS showed the highest photocatalytic performance, which was 4.70 times higher than that of pure g-C 3 N 4 NS. The results confirmed that the incorporation of WO 3 NS could definitely accelerate the transfer of photogenerated electrons and effectively promote the separation of electrons and holes, thereby improving the photocatalytic efficiency. The trapping experiments proved that the mechanism of photocatalytic degradation may be rooted in the formation of Z-scheme system.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2022
·
IF 7.139
Xuecheng Liu,Linjie Yan,Xiting Hu,Hongli Feng,Bingke Guo,Xia Ha,Hui Xu,Ruiqi Wang,Xuemei Tan,Hongyu Huang
A series of MnO 2 /g-C 3 N 4 composites with different exposed crystal plane were successfully prepared by different synthesized method. UV–Vis, PL , ESR and electrochemical results suggest that the visible-light absorbance, photoexcited electron-separation efficiency and oxygen defects are greatly dependent on the exposed crystal-faceted MnO 2 supported on g-C 3 N 4 . The experimental results display that the exposed crystal plane of MnO 2 have great influences on the photocatalytic hydrogen evolution performance, and the m-MnOCN composite with exposed (111) crystal plane exhibits superior photocatalytic performance for the release of H 2 under visible light irradiation , followed by the order of b-MnOCN [002]> p-MnOCN [110]. Moreover, Mechanism studies have shown that the possible mechanism of photocatalytic hydrogen evolution reaction is Z-scheme mechanism.
研究领域:
材料科学
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环境科学
·
化学
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2022
·Vol. 33
·期 22
·17587-17598
·
IF 2.779
Yu Bo,Miao Chun,Wang Dandan,Li Hongji,Sun Dongshu,Jiang Wei,Liu Chunbo,Che Guangbo
The development of high-efficiency heterojunction with improved photocatalytic property is regarded as a promising way to decontaminate wastewater. In this study, Z-Scheme g-C 3 N 4 /H-TiO 2 heterojunctions with different proportions were synthesized. The photocatalytic degradation of rhodamine B (RhB) was studied under visible light irradiation. Among them, 10% g-C 3 N 4 /H-TiO 2 photocatalyst had the best performance, and the degradation rate of RhB was 65% within 120 min. In addition, 10% g-C 3 N 4 /H-TiO 2 photocatalyst had high stability, and its photocatalytic activity did not decrease significantly after four cycles. Through photocurrent analysis, it is found that the photogenerated carriers have obviously excellent separation and transfer characteristics, which makes the 10% g-C 3 N 4 /H-TiO 2 photocatalyst have good degradation performance. Electron paramagnetic resonance (ESR) experiments showed that ·OH and ·O 2 − were active radicals during degradation.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
Journal of Materials Research and Technology-JMR&T
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2022
·
IF 6.267
Fang Wang,Zhe Chen,Zhenzhou Zhu,Jia Guo
Antibiotics in pharmaceutical and aquaculture wastewater is a growing threat to the environment of world, due to the induction of drug-resistant bacteria and the harm to the aquatic organisms. Photocatalytic membrane, which has immobilized photocatalyst on membrane is an effective and environmentally friendly technology for antibiotics degradation. In this study, a novel photocatalytic membrane was prepared by loading ZnO/N-g-C 3 N 4 composite on commercial polymer membrane with glutaraldehyde as a crosslinker through pressure driven filtration. The loading of the photocatalyst over the membranes was validated by Fourier transform infrared spectroscopy, scanning electron microscope and X-ray photoelectron spectroscopy. The photocatalytic properties of ZnO/N-g-C 3 N 4 composite membrane were observed efficient for degradation of tetracycline, ciprofloxacin and ofloxacin in both immersion and filtration model under visible light (λ > 420 nm). Especially, a ZnO/N-g-C 3 N 4 loading amount of 1.12 g/cm 2 and glutaraldehyde concentration of 45% led to the degradation rate of 100% and 80% for tetracycline at 5 mg/L and 10 mg/L, respectively. Low trans-membrane pressure (0.005 MPa) and narrow membrane size (50 kDa) were favorable for antibiotics degradation in filtration model due to long reaction time on membrane surface. Construction and performance of ZnO/N-g-C 3 N 4 composite membrane might provide new strategy for energy saving wastewater treatment.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
Magnetochemistry
·
2023
·Vol. 9
·期 11
·231
·
IF 2.7
Kai Wang,Liqin Yan,Youguo Shi,Baogen Shen,Lunhua He,Fangwei Wang,Jun Lu,Tongyun Zhao,Zunming Lu
Among the 5d transition metal iridates, Sr2IrO4, which has a layered chalcogenide structure, has received much attention due to its strong spin–orbit coupling (SOC), which produces Mott insulating states and anomalous physical behaviors. In this paper, the microscopic magnetism of Sr2IrO4is studied with electron spin resonance (ESR) measurements. The Lande factorgof the ferromagnetic resonance signal of Sr2IrO4shows anomalous behavior compared to typical ferromagnets. It gradually decreases, and the corresponding resonance fieldHrincreases, with decreasing temperature. The various physical parameters. including the saturated magnetic fieldHsderived fromM-H,Hr, ΔHpp, thegfactor and the intensityIextracted from ESR spectra, are analyzed in detail. Eventually, it is revealed that the anomalous behavior of theg-factor is induced by in-plane Dzyaloshinsky–Moriya interaction (DMI) rather than the SOC effect.
研究领域:
凝聚态物理
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磁性材料
·
强关联电子系统
·
自旋电子学
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共振谱学
✓ 已验证
DOI
高影响因子
COMPOSITES COMMUNICATIONS
·
2025
·
IF 7.7
Wei Wang,Hong Cao,Jian You,Yongzhao Li,Weihe Yu,Huaiyin Chen,Longmin Liu,Meihua Wu,Yuekun Lai,Weilong Cai
As the raw material for fabricating polyphenylene sulfide (PPS) fibers, PPS resin exhibits great processing and application value. However, the oxidative cross-linking among PPS molecules at high temperatures causes increasing melt viscosity and decreasing fluidity, making PPS processing difficult and lower production quality and efficiency. In this research, we realize the dual improvement of PPS resin in the fluidity and oxidation resistance by introducing a new AO-g-C 3 N 4 composite modifier. First, an antioxidant (AO) was grafted onto the surface of graphitic carbon nitride (g-C 3 N 4 ) through amination to synthesize AO-g-C 3 N 4 . Subsequently, AO-g-C 3 N 4 was incorporated into PPS resin using the melt extrusion process, yielding a novel flow-enhancing and antioxidant PPS-based composite material. It is found that the AO-g-C 3 N 4 /PPS material possesses excellent properties with a significantly raised melt index (>50 %) and notably decreased shear viscosity (>20 %). Besides, the dynamic oxidation induction temperature of AO-g-C 3 N 4 /PPS has increased, indicating inhibited oxidative cross-linking, while the crystallinity has increased. These suggest that the incorporation of AO-g-C 3 N 4 into PPS resin can enhance its fluidity and antioxidation properties, providing valuable insight for the modification research of PPS resin. The AO-g-C 3 N 4 /PPS exhibits the characteristic of easier processing, which offers promising prospects for developing the downstream industry of PPS resin.
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
International Journal of Environmental Research and Public Health
·
2022
·Vol. 19
·期 24
·16651
·
IF 4.614
Nan Yang,Zhihan Zhang,Shicheng Zhang,Liting Chen,Jia Zhu,Jingsi Gao
In order to improve the catalytic activity and recycling performance of semiconductor activators, and improve the activation pathway of persulfate, graphitic carbon nitride (g-C3N4) was prepared by calcining melamine, and a composite activator Ag2O/g-C3N4based on g-C3N4supported metal oxide was prepared using a precipitation method. The morphology, structure, and basic properties of the composites were characterized using SEM, XRD, FT-IR and XPS. The activation efficiency of the Ag2O/g-C3N4composite activator on peroxodisulfate (PDS) was explored. The results showed that Ag2O in the composite activator was highly dispersed on the surface of g-C3N4and did not change the molecular structure of g-C3N4significantly. Under different activation systems, the degradation process of MO was best fitted under the pseudo-second-order reaction kinetic model, compared to the separate g-C3N4or Ag2O activated PDS systems; the activation of the PDS system with Ag2O/g-C3N4had the best effect on MO degradation; and the composite activator Ag2O/g-C3N4showed better activation performance. Under the conditions that the mass combined ratio of Ag2O in the activator was 12%, the initial concentration of PDS was 4 mmol/L, the initial concentration of the activator was 1.25 g/L, and the initial pH was 3, the degradation degree of MO reached 99.4% after 40 min reaction. The free radical quenching experiment proved that the active substances that could degrade MO in the system were SO4−· and ·OH, and the effect of SO4−· was greater than that of ·OH. The degradation degree of MO in the reaction system remained above 80% after four cycles of use, and the crystal structure of Ag2O/g-C3N4did not change significantly before and after the reaction. The above results show that Ag2O/g-C3N4is an efficient and stable composite activator with good application potential in the treatment of dye wastewater by activating PDS.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2016
·
IF 2.758
Jiang Cheng,Xuelian Yan,Qionghua Mo,Bitao Liu,Jun Wang,Xin Yang,Lu Li
A g-C 3 N 4 /BiVO 4 composite photocatalyst with enhanced photocatalytic activity and photoelectrochemical (PEC) performance was fabricated via a simple synthesis method with BiVO 4 nanofibers as starting material. The materials were characterized with different techniques such as X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), UV–vis diffuse reflectance spectroscopy (DRS), Fourier transform infrared spectroscopy (FT-IR), N 2 absorption–desorption isotherm (BET) and photoluminescence spectroscopy (PL). The results showed that this synthesis method is effective to make a composite. The photocatalytic evaluation indicates that the photocatalytic activity of the g-C 3 N 4 /BiVO 4 photocatalyst for methylene blue (MB) was about 8 and 7 times higher than that of pure BiVO 4 and g-C 3 N 4 , respectively. This should be due to the enhanced light harvesting ability and to the effective electron transfer during the photocatalytic reaction.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
ANALYTICAL CHEMISTRY
·
2018
·
IF 6.042
Yuchen Jin,Qi Kang,Xinli Guo,Bin Zhang,Dazhong Shen,Guizheng Zou
Signal amplification for electrochemiluminescence (ECL) has conventionally been achieved by employing effective matrixes that can accelerate the electrochemical redox processes or carry more electrochemiluminophores. Herein, a convenient signal-amplification strategy was proposed for an ECL immunoassay with carboxylated g-C3N4 nanosheets (NSs) as tags and carcinoembryonic antigen (CEA) as the model target via electrochemically pretreating the substrate: a glassy-carbon electrode (GCE) modified with a polymerized 2-aminoterephthalic acid (ATA) film (GCE/ATA). Bioconjugates of g-C3N4 NSs and the signal CEA antibody (Ab2) (i.e., g-C3N4 NS–Ab2) were immobilized on GCE/ATA via a sandwich immunoreaction to form GCE/ATA–Ab1–Ag–Ab2–NSs. Electrochemical-impedance spectroscopy and potential-resolved ECL characterization proved that GCE/ATA plays an important role in the electron-transfer resistance (Ret) of the GCE/ATA–Ab1–Ag–Ab2–NSs for ECL and that successively scanning GCE/ATA–Ab1–Ag–Ab2–NSs from 0 to −1.6 V in K2S2O8- and H2O2-containing medium could reduce the Ret and bring out 3.3-times-enhanced ECL at the 10th scan cycle compared with that of the 1st scan cycle, which was about 10.2 times the ECL of the GCE/ATA–Ab1–Ag–Ab2–NSs in medium containing merely K2S2O8. Inspired by this, direct and successive scanning of GCE/ATA in K2S2O8- and H2O2-containing medium was employed during fabrication, which dramatically reduced the Ret of GCE/ATA–Ab1–Ag–Ab2–NSs and brought out obviously enhanced ECL responses for selectively determining CEA from 0.1 pg/mL to 1 ng/mL, with a detection limit of 3 fg/mL.
研究领域:
分析化学
·
生物医学工程
✓ 已验证
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）