JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2020
·Vol. 20
·期 3
·1936-1940
·
IF 1.134
Chen Guochang,Zhu Mingming,Wang Lichun,Wu Xingrong
In this investigation, AgBr/g-C3N4 composite as an effective LED-irradiation photocatalyst was synthesized via a one-pot method. In this composite, the colloidal spheres of AgBr were uniformly dispersed on the g-C3N4 nanosheets, which were
characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray powder diffraction (XRD), X-ray photoelectron spectroscopy (XPS), UV-vis diffused reflectance spectroscopy (DRS), and photoluminescence (PL) spectroscopy. The introduction of g-C3N4
nanosheets improved the stability and optimized the spatial charge carrier transfer compared to pristine AgBr, hence exhibited excellent activities toward the degradation of methyl orange (MO) as evidenced by the discoloration rate of MO by 94.8% after 120 min of irradiation. Also, the mechanism
based on the band structures and microstructures of the catalysts was then proposed.
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JOURNAL OF HAZARDOUS MATERIALS
·
2018
·
IF 6.434
Rui Li,Yuling Ren,Peixia Zhao,Jing Wang,Jindun Liu,Yatao Zhang
Membrane fouling significantly impedes membrane performance and thus short lifespan of the membrane. Membranes that functionalized with photocatalytic activity are deemed as an effective and novel approach to settle membrane fouling. The membranes with self-cleaning and antibacterial performance were fabricated via facilely filtering g-C 3 N 4 nanosheets onto polyacrylonitrile (PAN) porous substrates. The g-C 3 N 4 nanosheets were exfoliated by acid etching and ultrasound treatment, and the exfoliated nanosheets was verified by Fourier transform infrared spectra, Atomic force microscopy and X-ray diffraction. The g-C 3 N 4 nanosheets functionalized composite membranes have a water permeability of 11.70 L m −2 h -1 bar -1 and a good antibacterial activity. In addition, the membranes could be restored their original permeability and their surfaces were close to initial color even after three cycles rejecting dyes and post treatment under irradiation with visible light. Besides, the degradable and antimicrobial mechanisms of the membranes were investigated respectively. These g-C3N4 nanosheets composite membranes with self-cleaning and antimicrobial properties have a potential feasibility in water treatment, and provide an alternative method for fabricating self-cleaning membranes.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2020
·
IF 5.774
Mengni Ge,Xiaoying Wang,Shaoyu Wu,Yunliang Long,Yan Yang,Jianfeng Zhang
Improvement of antifouling and chlorine resistance properties of polyamide (PA) reverse osmosis (RO) membranes have been major challenges for desalination of seawater. In this work, graphitic carbon nitride nanosheets (g-C 3 N 4 NS) were incorporated into PA membranes (PA/CN) through an in-situ interfacial polymerization process. With the optimized g-C 3 N 4 NS loading within the PA-RO membranes (PA/CN100), the water permeability was improved by about 30% with a high salt rejection ratio of 99.23%. More importantly, due to the attractive features of g-C 3 N 4 NS, including N H bonds to provide more chlorine attack sites, rich oxygen-containing functional groups to capture and react with chlorine radicals, negatively charged membrane surface to repel and isolate active chlorine and pollutants, the chlorine resistance and antifouling performance of PA RO membranes were greatly enhanced. After being immersed in an active chlorine solution of 1000 ppm for 24 h, the PA/CN100 membranes show a higher chlorine resistance compared to that of pure PA RO membranes, with salt rejection decreased by 1.08% and 2.95%, respectively. Moreover, after 200 ppm bovine serum albumin (BSA) treatment, the total fouling rate was 31.2% for PA membrane and 18.3% for PA/CN100 membrane . This work provides a promising approach to improve the comprehensive performance for desalination and the trend of industrialization.
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PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
·
2022
·
IF 7.926
Xiaodong Wang,Yongxun Dai,Chen Tian,Huize Zhang,Xiwen Li,Wenlong Liu,Weibing Li,Shaoping Kuang,Hongtao Tong
Photocatalysts can be effectively recovered and reused by compounding with magnetic nanostructures. How to further improve the photocatalytic performance of magnetic heterojunction photocatalysts remains a great challenge. In this work, g-C 3 N 4 /ZnFe 2 O 4 (CN/ZFO) magnetic heterojunction photocatalyst was first prepared and then modified with ultrathin MoS 2 (CN/ZFO/MoS 2 ) by simple ball-milling method. Then the photocatalytic removal of Cr(Ⅵ) performance of the prepared series photocatalysts was evaluated in detail. The optimum CN/ZFO/MoS 2 can achieve 99.3% Cr(Ⅵ) removal under 200-min simulated sunlight illumination, which is much higher than CN/ZFO (54.0%). The enhanced photocatalytic performance benefits from the modification of MoS 2 , which improves the light absorption performance, facilitates the transfer of photogenerated carriers , increases the concentration of photogenerated carriers and promotes the effective separation of photogenerated carriers. This work provides a theoretical basis for further preparation of magnetic recyclable photocatalysts with high photocatalytic performance.
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Chemical Engineering Journal Advances
·
2022
·
IF 0
Wei Xue,Bo Han,Haojie Ma,Xueyan Hou,Ji-Jiang Wang,Ran Li,Yuqi Zhang
Novel TiO 2 nanotube arrays (TNAs) involved heterojunctions are widely used as photocatalyst for pollutants, while the residues are usually detected by other method. A device which integrates photocatalytic degradation and enhancing detection signals could increase the atom utilization and decrease detection cost. In this work, a novel TNAs/g-C 3 N 4 /AuNPs heterojunction was prepared and used as photocatalyst and SERS substrate simultaneously. Dye of crystal violet was successfully degraded, and the concentration of residue was detected by Raman spectroscopy. There was a good linear correlation between the Raman intensity and the concentration of crystal violet from 10 −10 M to 10 −6 M, and the limit of detection (LoD) was 8.79 × 10 −11 M. Moreover, the prepared heterojunctions were used on wastewater and biological staining detection. In the applications of photocatalytic degradation and detection, the time-dependent SERS intensities demonstrated the photocatalytic degradation achieved more than 95% in 20 min, and almost completed in 25 min, and the heterojunctions showed good recyclability in at least 10 cycles. For SERS property, the original enhancement factor (EF) was calculated to be 7.43 × 10 6 , then the EF descended slightly and remained with less than 90% attenuation after 10 cycles.
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CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Shizhen Liu,Shaobin Wang,Yao Jiang,Zhenqing Zhao,Guiyuan Jiang,Zhenyu Sun
Fe 2 O 3 loaded porous graphitic carbon nitride ( g -C 3 N 4 ) photocatalysts have been prepared simply by thermal treatment in a hypoxia environment and the photocatalytic activities were evaluated in photocatalytic nitrogen fixation under artificial solar irradiation. Efficient reduction of dinitrogen to ammonia by photocatalysis over the hybrid catalysts was achieved even when the content of iron in the sample was less than 1 wt%, with an ammonia yield rate reaching 47.9 mg/L/h, 6 times higher than that of bare g -C 3 N 4 . The photocatalytic performance also outperforms many currently reported g -C 3 N 4 -based photocatalysts. X-ray photoelectron spectroscopy and Mӧssbauer spectroscopy confirmed the formation of Fe 2 O 3 in the photocatalyst and BET analysis revealed an enlarged pore volume by adjusting treatment temperature, providing benefits for photogenerated carrier separation and N 2 adsorption over the catalyst surface. Such g -C 3 N 4 supported Fe 2 O 3 nanoparticles with low-cost holds promise as one of the family member of photocatalysts for efficient N 2 fixation.
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ChemSusChem
·
2018
·Vol. 11
·期 24
·4256-4261
·
IF 7.411
Huajun Feng,Qiaoqi Guo,Yingfeng Xu,Ting Chen,Yuyang Zhou,Yigang Wang,Meizhen Wang,Dongsheng Shen
Photocatalytic conversion of CO 2 can provide a solution for simultaneously addressing global warming and solar fuel generation. However, its applicability is presently limited by the unsatisfactory photoconversion efficiency of the state-of-art photocatalysts. In this regard, enhancing CO 2 adsorption through surface modification could be an efficient way to improve the photoconversion efficiency. Herein, doping of nonpolar carbon quantum dots (CQDs) onto g-C 3 N 4 is reported for the construction of a metal-free heterojunction photocatalyst (CQDs/g-C 3 N 4 ). CQDs offer several advantages such as band-gap reduction and electron-withdrawing effect to improve light absorption and photocarrier separation efficiency. However, this study reveals that nonpolar CQDs could also improve CO 2 adsorption, photoinduced H 2 production, reaction kinetics, and alter CO 2 photoreduction pathways to generate CH 4 . Consequently, the CQDs/g-C 3 N 4 could generate six times more CO and CH 4 without detectable H 2 compared to pristine g-C 3 N 4 , under similar conditions. Therefore, this study demonstrates a promising strategy for efficient adsorption, activation, and subsequent photoreduction of CO 2 by nonpolar surface modification of g-C 3 N 4 . Graphical Fighting carbon with carbon : Incorporation of nonpolar carbon quantum dots on the surface of g-C 3 N 4 imparts several benefits, including band reduction, improved charge separation, and increased CO 2 adsorption. This enhances reaction kinetics and alters the pathways for photoreduction of CO 2 , thereby enabling efficient CO and CH 4 generation.
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RSC Advances
·
2023
·Vol. 13
·期 23
·15998
·
IF 3.9
Jiehong He,Pin Lv,Jian Zhu,Hexing Li
Correction for ‘Selective CO 2 reduction to HCOOH on a Pt/In 2 O 3 /g-C 3 N 4 multifunctional visible-photocatalyst’ by Jiehong He et al. , RSC Adv. , 2020, 10 , 22460–22467, https://doi.org/10.1039/D0RA03959D .
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SOLID STATE SCIENCES
·
2020
·
IF 2.434
Muyan Zhou,Yong Wu,Lingyi Shi,Shiyu Hu,Huanhuan Li,Yinyan Gong,Lengyuan Niu,Xinjuan Liu,Can Li
The large work function difference between two semiconductors will effectively adjust the interfacial electronic distribution and catalytic performances of heterojunction . In this work, a novel t -ZrO 2 /g-C 3 N 4 composite photocatalyst was prepared by integrating t -ZrO 2 nanoparticle with graphitic carbon nitride (g-C 3 N 4 ) film considering the large work function of tetragonal ZrO 2 ( t -ZrO 2 ). With the aid of experimental measurements and density functional theory calculations, the electronic distributions of g-C 3 N 4 film were explicitly adjusted by the supporting t -ZrO 2 nanoparticle on account of the large interfacial internal electric field , which leaded to the improvement of photogenerated carriers mobility and lifetime, the enhancement of reduction ability and the increase of oxidation active sites. Results showed that the photocatalytic activity of the composite sample was increased by 9.4 and 2.9 times compared with g-C 3 N 4 sample for Rhodamine B and tetracycline hydrochloride degradation under visible-light. This modification strategy shall be applied to devise other high-efficient catalysts by selecting semiconductor with suitable work function.
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AICHE JOURNAL
·
2019
·Vol. 65
·期 10
·e16699
·
IF 3.463
Lingfei Liu,Yisa Zhou,Jian Xue,Haihui Wang
Graphene oxide (GO) membranes have shown great potential for water purification, but their permeability and antipressure ability are poor, which limits their practical applications. In this study, two-dimensional graphitic carbon nitride (g-C 3 N 4 ) nanosheet-intercalated GO (GOCN) membranes were developed to improve the separation performance of GO membranes, especially under high operating pressure. After incorporation of the g-C 3 N 4 nanosheets, the amount of permeable nanochannels (wrinkles or corrugation) in the membrane increased; hence, the water permeance was effectively improved (twice as high as that of GO membranes). Moreover, the antipressure performance of the GOCN membranes was significantly enhanced (even below 0.5 MPa pressure) as the nanochannels in the composite membranes become stable and rigid due to the support of the pressure-resistant g-C 3 N 4 nanosheets. The good separation performance demonstrates that the intercalation of g-C 3 N 4 is an effective strategy to improve the GO-based membrane properties, which can promote their application in water purification.
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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
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ENVIRONMENTAL RESEARCH
·
2025
·
IF 7.7
Xueying Zhao,Chao Yang,Jide Wang,Hina Arshad,Wei Li,Xin Liu,Qingqing Guan,Lu Wang,Ronglan Wu,Yunlong Zhao
Graphitic carbon nitride (g-C 3 N 4 ) is readily accessible through thermal polycondensation of nitrogen-containing precursors, but its photocatalytic efficiency remains largely constrained due to a compactly stacked texture, small surface area, and rapid electron-hole recombination. Herein, loosely-textured g-C 3 N 4 nanosheets were synthesized by thermal polymerization of the mixed melamine and urea precursors in the presence of structure-mediating oxalic acid and water molecules. This dual-molecule-mediation gave some enhanced features to g-C 3 N 4 , such as increased surface area, relatively high crystallinity, and negatively-shifted conduction band. Subsequently, ZnS–NiS 2 (ZNS) as a cocatalyst for improving photocatalytic hydrogen evolution was loaded on g-C 3 N 4 nanosheets via solution phase deposition. The best performing g-C 3 N 4 nanosheets (WOCN-0.1) exhibited a high removal efficiency of methyl orange (95.3%), methylene blue (83.4%), ciprofloxacin (73.9%), and o -nitroaniline (98.3%) within 90 min, respectively. Moreover, ZNS/WOCN-0.1 exhibited a high hydrogen evolution rate of 703.4 μmol h −1 g −1 , showing an enhancement of 109% in photocatalytic activity compared to ZNS/CN. The enhanced activity could be attributed to the improvement of charge separation and transfer, and easy hydrogen desorption. This work renders a potential of dual molecule-mediated polymerization in tuning the structures and catalytic performance of g-C 3 N 4 .
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