RSC Advances
·
2021
·Vol. 11
·期 56
·35663-35672
·
IF 3.361
Fang Wang,Zhenzhou Zhu,Jia Guo
ZnO and g-C3N4 provide excellent photocatalytic properties for degradation of antibiotics in pharmaceutical wastewater. In this work, 2D–2D ZnO/N doped g-C3N4 (NCN) composite photocatalysts were prepared for degradation of tetracycline (TC), ciprofloxacin (CIP) and ofloxacin (OFLX). The addition of ZnO resulted in higher separation efficiency and lower recombination rate of photogenerated charge under visible light. The composite photocatalyst showed better degradation performance compared to ZnO or NCN alone. The TC degradation reached 81.3% in 15 minutes by applying the prepared 20% ZnO/NCN composite photocatalyst, showing great competitiveness among literature reported g-C3N4 based photocatalysts. After 30 minutes, the degradation rate of TC, CIP and OFLX reached 82.4%, 64.4% and 78.2%, respectively. The TC degradation constant of the composite photocatalyst was 2.7 times and 6.4 times higher than NCN and CN, respectively. Radical trapping experiments indicated that ·O2− was the dominant active substance. The transference of excited electrons from the conduction band (CB) of NCN to ZnO enhanced the separation of photogenerated electron–hole pairs and simultaneously suppressed their recombination. This study provides a possibility for the design of high-performance photocatalysts for antibiotics degradation in wastewater.
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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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APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Jingce Bi,Nianzhu Yang,Huichun Xue,Ningning Liu,Yi Wang,Xia Zhang,Zhuopeng Wang,Lin Zhu,Yide Han
Molten salt-assisted pyrolysis has emerged as an effective strategy for engineering defective/doped g-C 3 N 4 photocatalysts for CO 2 reduction. While K + incorporation enhances interlayer charge transport, excessive K + generates detrimental nitrogen vacancies that destabilize the heptazine framework and compromise carrier mobility. Herein, we developed S/K co-doped graphitic carbon nitride (g-C 3 N 4 ) with tunable nitrogen vacancies (denoted SWCN-M) via molten salt (KCl-LiCl) pyrolysis of sulfur-containing supramolecular precursors (melamine with thiourea or thioacetamide). The nitrogen vacancy concentration is precisely modulated by the choice of sulfur precursor (thiourea vs. thioacetamide) to optimize the synergy effect of K + -N-vacancy, and eventually boosting photocatalytic performance. The thiourea-derived SWCN-M TU achieves a CO evolution rate of 165.7 μmol g −1 h −1 , outperforming its thioacetamide analogue (SWCN-M TAA , 90.4 μmol g −1 h −1 ), pristine WCN (53.8 μmol g −1 h −1 ), and K-doped WCN-M (64.3 μmol g −1 h −1 ) by factors of 1.8, 3.1, and 2.6, respectively. DFT calculation results reveal that S-doping induces charge localization, elevating the N-vacancy formation energy via Coulombic repulsion with K + . This work advances the rational design of vacancy-engineered carbon nitride for photocatalytic CO 2 reduction
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RARE METALS
·
2025
·
IF 11
He Sheng-Lin,Wen Yi-Kai,Gao Shu-Lin,Hu Su-Juan
Surface contamination caused by oxidation by-products severely compromises the signal stability and reusability of electrochemical sensors. However, achieving rapid and complete regeneration of electrode activity under mild conditions remains a challenge. Herein, we develop a delocalized-electron-driven photocatalytic regeneration strategy by nanosheet-like g-C 3 N 4 with extended π-conjugation. Compared with bulk g-C 3 N 4 , the nanosheet structure promotes electron delocalization, facilitates interfacial charge transfer, and enhances the generation of reactive oxygen species, thereby accelerating the photodegradation of surface-bound fouling species. In-situ electron paramagnetic resonance spectroscopy provides strong evidence for the dynamic formation of delocalized electrons and radical intermediates during regeneration. As a result, the sensor exhibits complete signal recovery within 12 min under sunlight and maintains high detection accuracy over 35 regeneration cycles, with a detection limit of ~ 70 nM. This work provides a mild solution to the design of regenerable sensing platforms. Graphical abstract
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2025
·
IF 3.9
Hengxin Ren,Jinghang Li,Yanan Niu,Wu Zhang,Yuguang Lv,Ying Wang,Chaoyu Song
This study presents the synthesis and evaluation of a BiVO4/g-C3N4/PANI ternary heterojunction photocatalyst for the degradation of enrofloxacin (ENR) under visible light irradiation. The results demonstrate that the BiVO4/g-C3N4/PANI (10%) composite achieved a 91% removal efficiency of ENR within 120 min, following first-order kinetic behavior. Moreover, the photocatalyst exhibited stable degradation performance and maintained structural integrity after five consecutive cycles. The photocatalyst was characterized by XRD, SEM, TEM, FT-IR, XPS, and UV–vis DRS. The enhanced photocatalytic performance is attributed to the Z-scheme charge transfer mechanism facilitated by PANI, which enhances the separation of photogenerated carriers and reduces their recombination rate. Radical scavenging experiments and ESR spectroscopy confirmed that superoxide radicals (•O2–) and hydroxyl radicals (•OH) play dominant roles in the degradation process. Additionally, 15 degradation products of ENR were identified, and four major degradation pathways were proposed. The findings provide a theoretical basis for the application of this ternary heterojunction in environmental remediation and highlight its potential for efficient degradation of antibiotics.
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Science China-Materials
·
2019
·Vol. 63
·期 2
·258-266
·
IF 5.636
Ma Bo,Zhao Jinping,Ge Zhenhua,Chen Yantao,Yuan Zhihao
Graphitic carbon nitride (g-C 3 N 4 ) coupled with NiCoP nanoparticles with sizes around 5 nm have been fabricated via a controllable alcohothermal process. NiCoP is an excellent electron conductor and cocatalyst in photocatalytic reactions. The coupling between tiny NiCoP nanoparticles and g-C 3 N 4 through in-situ fabrication strategy could be a promising way to eliminate the light screening effect, hinder the recombination of photo-induced charge carriers, and improve the charge transfer. The NiCoP/g-C 3 N 4 nanohybrids exhibit an excellent photocatalytic activity in the hydrogen generation, with a significantly improved performance compared with original g-C 3 N 4 , CoP/g-C 3 N 4 and Ni 2 P/g-C 3 N 4 , respectively. This study paves a new way to design transition metal phosphides-based photocatalysts for hydrogen production.
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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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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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NANOTECHNOLOGY
·
2022
·Vol. 33
·期 17
·175401
·
IF 3.953
Xiyu Deng,Xinya Kuang,Jiyang Zeng,Baoye Zi,Yiwen Ma,Ruihan Yan,Jin Zhang,Bin Xiao,Qingju Liu
Photocatalytic water splitting is considered to be a feasible method to replace traditional energy. However, most of the catalysts have unsatisfactory performance. In this work, we used a hydrothermal process to grow Ag nanoparticles in situ on g-C3N4 nanosheets, and then a high performance catalyst (Ag–g–C3N4) under visible light was obtained. The Ag nanoparticles obtained by this process are amorphous and exhibit excellent catalytic activity. At the same time, the local plasmon resonance effect of Ag can effectively enhance the absorption intensity of visible light by the catalyst. The hydrogen production rate promote to 1035 μmol g−1 h−1 after loaded 0.6 wt% of Ag under the visible light, which was 313 times higher than that of pure g-C3N4 (3.3 μmol g−1 h−1). This hydrogen production rate is higher than most previously reported catalysts which loaded with Ag or Pt. The excellent activity of Ag-g-C3N4 is benefited from the Ag nanoparticles and special interaction in each other. Through various analysis and characterization methods, it is shown that the synergy between Ag and g-C3N4 can effectively promote the separation of carriers and the transfer of electrons. Our work proves that Ag-g-C3N4 is a promising catalyst to make full use of solar energy.
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JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
·
2024
·
IF 4.1
Shuhan Jiang,Yujie Jia,Xiaoxia Yang,Qianchen Ou,Yanan Liu,Siqian Zhang,Dianwu Huang,Hongmei Wang
FeCo-LDH/g-C 3 N 4 S-type heterojunction photocatalysts were successfully prepared by thermal polymerization and electrostatic self-assembly methods. The structure, morphology, light absorption and photoelectrochemical properties of the prepared samples were characterized. The photocatalytic properties of the photocatalysts were evaluated by the degradation of tetracycline (TC) and photocatalytic hydrogen evolution from water splitting under visible light irradiation. The experimental results showed that the photocatalytic properties of FeCo-LDH/g-C 3 N 4 nanocomposites were superior to those of pristine g-C 3 N 4 . In addition, when the mass ratio of FeCo-LDH to g-C 3 N 4 was 7:100, the photocatalytic performance of the as-prepared FeCo-LDH(7 %)/g-C 3 N 4 is the optimal. The TC degradation rate of FeCo-LDH(7 %)/g-C 3 N 4 reached 78.0 % within 120 min, which was 2.63 times of that of pure g-C 3 N 4 . And the photocatalytic hydrogen evolution of FeCo-LDH(7 %)/g-C 3 N 4 was 107.28 μmol for 4 h, which was 12.68 times that of g-C 3 N 4 . The results showed that the as-prepared FeCo-LDH/g-C 3 N 4 nanocomposite photocatalysts have excellent performance in the degradation of TC and the photocatalytic H 2 evolution. Meanwhile, the EPR and trapping experiments revealed that OH and O 2 − played a main role in the photocatalytic TC degradation. The mechanism of photocatalytic TC degradation and hydrogen production of FeCo-LDH/g-C 3 N 4 nanocomposite photocatalysts was also discussed.
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