APPLIED CATALYSIS B-ENVIRONMENTAL
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2018
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IF 11.698
Kexin Li,Ziai Huang,Suiyi Zhu,Shenglian Luo,Liushui Yan,Yuhua Dai,Yihang Guo,Yuxin Yang
A series of biochar-coupled graphitic carbon nitride nanosheets (BPCMSs/g-C 3 N 4 NSs) composites was successfully fabricated through a simple two-step calcination strategy by using waste Camellia oleifera shells (WCOSs) and melamine as raw materials. Hexavalent chromium [Cr(VI)] or total chromium (T-Cr) in water could be completely removed or mostly recovered through adsorption combined with photocatalytic reduction by using the as-prepared BPCMSs/g-C 3 N 4 NSs. The adsorbed Cr(VI) on BPCMSs/g-C 3 N 4 NSs could be reduced by photogenerated electrons into trivalent chromium ions (Cr 3+ ) and stably fixed on BPCMSs/g-C 3 N 4 NSs after strengthening. Interestingly, we found that the photocatalytic activity of the recycled Cr 3+ /BPCMSs/g-C 3 N 4 NSs was remarkably improved compared with that of the fresh BPCMSs/g-C 3 N 4 NSs for the degradation of aqueous organic pollutants . We tested the photocatalytic performance of the recycled Cr 3+ /BPCMSs/g-C 3 N 4 NSs in the combined pollution system containing Cr(VI) and 4-fluorophenol (4-FP) and observed that a synergistic photocatalytic effect occurred in the Cr(VI)/4-FP combined pollution system under acidic and neutral conditions.
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JOURNAL OF HAZARDOUS MATERIALS
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2023
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IF 13.6
Man-Man Wang,Zi-Ling Li,Han Wu,Ke-Yan Chen,Fan Guo,Gui-Fu Zuo,Yu He,Xue-Bo Yin
Magnetic solid-phase extraction (MSPE) was developed based on a well-designed Fe 3 O 4 -NH 2 @g-C 3 N 4 nanocomposite as sorbent for a mixture of six benzophenones (BPs) in environmental water samples. The composite fabricated via in-situ self-assembled g-C 3 N 4 shell with homogeneous polymerization of cyanuric chloride and cyanuric acid on Fe 3 O 4 -NH 2 core. While high adsorption capacity was derived from g-C 3 N 4 via hydrophobic, π-π and hydrogen bonding interactions to the targets, the fast magnetic separation was realized with Fe 3 O 4 core for less solvent consumption. In combination with LC-MS/MS, the Fe 3 O 4 -NH 2 @g-C 3 N 4 sorbent minimized the interfering components, reduced the matrix effects, and provided the enrichment factors of 121–150 for six BPs with relative standard deviations ≤ 9.7% even after 20 times extraction-desorption cycles. The present method gave the detection limits of 0.3–2.5 ng/L for six BPs with the linear ranges of 1.0–2000 ng/L, and the recoveries of 84.6%−104% in sea water and 86.2%−107% in lake water samples. Thus, the Fe 3 O 4 -NH 2 @g-C 3 N 4 -based MSPE coupled with LC-MS/MS method provided a convenient, efficient, and reliable alternative to monitor trace BPs in environmental water samples.
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Chemistry Africa-A Journal of the Tunisian Chemical Society
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2021
·Vol. 4
·期 2
·367-377
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IF 0
Zou Miaomiao,Zou Suyan,Hu Chunyan,Lin Xiaoyun,Ni Yongnian
In this paper, graphite phase carbon nitride (g-C 3 N 4 ) was prepared by one-step high temperature thermal decomposition method, and layered g-C 3 N 4 was prepared by protonation with concentrated hydrochloric acid. The morphology and composition of g-C 3 N 4 were characterised by transmission electron microscope (TEM), energy dispersive spectroscopy (EDS) and X-ray powder diffraction (XRD). Furthermore, the AuNPs-g-C 3 N 4 /GCE was constructed by coating method and potentiostatic deposition method, and the construction process and resistance change of the electrodes were characterised by cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). The experimental results indicated that the AuNPs-g-C 3 N 4 /GCE has excellent electrocatalytic performance for bisphenol A (BPA) and 4-n-octylphenol (OP). Under optimized experimental conditions, BPA and OP were detected by differential pulse voltammetry (DPV) at the AuNPs-g-C 3 N 4 /GCE. The linear ranges were 0.1–6.5 µmol L −1 and 0.1–3.8 µmol L −1 for BPA and OP, wtih the detection limits of 0.0176 µmol L −1 and 0.0324 µmol L −1 , respectively. In addition, the AuNPs-g-C 3 N 4 /GCE showed satisfactory reproducibility and stability and can be successfully applied to monitor of BPA and OP in baby formula samples.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2020
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IF 5.774
Shi-Wen Lv,Jing-Min Liu,Ning Zhao,Chun-Yang Li,Fei-Er Yang,Zhi-Hao Wang,Shuo Wang
Photocatalysis is a promising strategy to remove contaminants from wastewater. Herein, a novel g-C 3 N 4 @CoFe 2 O 4 /Fe 2 O 3 composite was synthesized via a feasible hydrothermal and calcination method. Benefiting from the Z-scheme heterojunction formed between MOF-derived CoFe 2 O 4 /Fe 2 O 3 and g-C 3 N 4 , the recombination of photoinduced electrons and holes could be inhibited effectively. Meanwhile, doping a little amount of MOF-derived CoFe 2 O 4 /Fe 2 O 3 could remarkably enhance visible light absorption ability of g-C 3 N 4 and reduce band gap of g-C 3 N 4 . Then, the resulting hybrid photocatalysts were employed as a high-efficient mediator to activate persulfate for degrading emergent organic contaminants under visible light irradiation. Significantly, TC of 99.7%, BPA of 98.1%, SMX of 94.8%, DFC of 97.0%, IBP of 96.1% and OFX of 96.5% could be removed within 80 min. Some important factors influencing photocatalytic degradation process were also investigated. The trapping experiments and EPR tests revealed that both SO 4 − and OH were involved in photocatalytic reaction. Besides, the introduction of MOF-derived CoFe 2 O 4 /Fe 2 O 3 provided a new approach for generating radical species. More importantly, obtained g-C 3 N 4 @CoFe 2 O 4 /Fe 2 O 3 -2 composites with good stability exhibited great application potential in the actual degradation tests. To sum up, current work provided novel ideas for photocatalytic oxidation technology in the organic pollution degradation.
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MICROPOROUS AND MESOPOROUS MATERIALS
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2020
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IF 4.551
Yunlei Zhang,Wen Guan,Hongyao Song,Yanan Wei,Pei Jin,Bing Li,Changhao Yan,Jianming Pan,Yongsheng Yan
Chemically functional microporous metal-organic frameworks (MOFs) crystals are attractive for catalysis applications, and recent results show that they can be immobilized on high stability substrates, such as carbon materials. In this work, g-C 3 N 4 supported UiO-66-type MOFs catalysts with only acid, base or acid-base bi-functional active sites, have been successfully synthesized via a green (aqueous solutions), mild (90 °C, atmospheric pressure), and one-pot modulated hydrothermal (MHT) method. The physical and chemical properties of the obtained catalysts were systematically characterized by different characterization methods. The results indicated that the synthesized catalysts have microporous structure, excellent thermostability and acid-base bi-functional active sites. One-pot synthesis of 5-hydroxymethylfurfural (5-HMF) from glucose was performed to investigate the activities of synthesized catalysts. Benefiting from the synergistic effects of the acid-base bi-functional active sites, the highest 5-HMF yield of 54.9% was achieved in an isopropanol-mediated DMSO system, under the optimal conditions. Moderate to excellent yields of 5-HMF were also obtained from one-pot conversions of other carbohydrates, including inulin , sucrose, cellobiose, maltose and starch , with our developed catalytic system. The one-pot production of 5-HMF from cellulose was also smoothly processed by the g-C 3 N 4 supported UiO-66-type MOFs catalysts in an IL-based system. This work offers a versatile strategy for developing supported UiO-66-type MOFs catalyst for a wide range of biomass transformation to platform chemicals.
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ACS Sustainable Chemistry & Engineering
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2018
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IF 6.14
Yuanyuan Chai,Lu Zhang,Qianqian Liu,Fengli Yang,Wei-Lin Dai
Oxidation of amines to imines under light irradiation has been widely studied in the field of heterogeneous catalysis. For the first time, we demonstrate a facile mixing calcination approach for the preparation of CeO2/g-C3N4-x as a heterojunction catalyst for the photo-oxidative coupling of benzylamine under the irradiation of a 300 W Xe arc lamp at 308 K with the air balloon. It was found that the rate constant of CeR/CN-66% was 3 times as high as that of pure CeO2 or g-C3N4. All kinds of structural characterizations suggested the formation of heterojunction between the CeO2 and g-C3N4, serving as a tunnel for the transfer of photoinduced charge, which may contribute to the improvement of photoactivity. Moreover, the Ce3+ ions and oxygen vacancy significantly promoted the adsorption and activation of substrate or molecular O2. Therefore, the efficient separation of the charges, the prolonged photoinduced electron lifetime, and the abundant defect structure (increased content of Ce3+ ions or the oxygen vacancy) were considered as the main factors for the higher photo-oxidation efficiency of the CeR/CN-66%. Another striking observation that was noticed was that the CeR/CN-66% was recycled up to five cycles under the same condition and was found to be highly efficient without any obvious decrease in the activity or selectivity due to the outstanding stability of the defect structure. Thus, highly efficient CeR/CN-x heterojunction catalyst was synthesized in this work by a simple approach for the photo-oxidation of benzylamine under mild reaction conditions, and this finding may provide wide applications in other photocatalysis areas.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2024
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IF 8.1
Enzheng Hu,Kang Xu,Ping Dai,Dongyan Xu
A biochar-incorporated g-C 3 N 4 composite was obtained by co-calcining the mixture of spent coffee grounds and melamine and used to anchor highly dispersed amorphous cobalt boride nanoparticles via an impregnation-reduction method. The as-prepared Co 2 B/BC-g-C 3 N 4 was applied to the catalytic hydrolysis of sodium borohydride to produce hydrogen . The physicochemical properties of Co 2 B/BC, Co 2 B/g-C 3 N 4 , and Co 2 B/BC-g-C 3 N 4 were evaluated by various techniques to help elucidate the effect of the composite structure on the performance of Co 2 B/BC-g-C 3 N 4 . The Co 2 B/BC-g-C 3 N 4 exhibits much better activity than Co 2 B/BC and Co 2 B/g-C 3 N 4 because of a synergistic effect between the biochar and g-C 3 N 4 . In addition, the reaction kinetics can be improved by exposing the reaction system to visible light irradiation, yielding a hydrogen generation rate of 10.3 L min −1 g Co −1 in comparison to that of 9.1 L min −1 g Co −1 under darkness. The possible mechanism of the H 2 generation from the catalytic hydrolysis of sodium borohydride over Co 2 B/BC-g-C 3 N 4 under visible light irradiation was proposed. This work highlights the potential application of biochar-incorporated g-C 3 N 4 composite in synthesizing metallic catalysts and their practical use for photo-assisted catalytic hydrolysis of sodium borohydride .
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APPLIED ENERGY
·
2025
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IF 11
Zhuofan Han,Dengjie Zhong,Yunlan Xu,Haixing Chang,Lin Dong,Yi Liu
In this study, N-doped carbon quantum dots (N-CQDs)/ZnIn 2 S 4 /tubular g-C 3 N 4 (TCN)/Ti photoanode was successfully prepared by a simple one-pot solvothermal method and silica sol drop coating method, which was assembled with Cu x O/Cu cathode to construct photocatalytic fuel cell (PFC) to degrade organic pollutants and generate electricity. The photoanode material aims to promote the separation and uniform transfer of photogenerated electron through the synergistic effect of Schottky junction and S-type heterojunction of 0D quantum dots. The PFC with N-CQDs-doped photoanode possessed strong power generation capacity (71.10·μW-cm −2 ) and high photoelectric conversion efficiency (0.098 %), which were 1.72 and 1.94 times that of the PFC with ZnIn 2 S 4 /tubular g-C 3 N 4 /Ti photoanode. It degraded more than 95 % of rhodamine B, 83.44 % of tetracycline and 50.66 % of bisphenol A within 30 min. The excellent performance of the developed PFC is attributed to the synergistic effect of different heterojunction in photoanode, and the improvement of absorption and utilization of visible light by doping N-CQDs. Both free radicals (•OH, •O 2 − ) and non-free radicals (h + , 1 O 2 ) were involved in the degradation process of pollutants. It is noteworthy that, due to the Schottky junction, the N-CQDs could act as electron warehouses to promote the production of H 2 O 2 , which could enhance the degradation effect. We believe that this research provides a new direction for the development and research work on efficient photoanodes. Synopsis N-CQDs was introduced into PFC photoanode to construct the synergistic effect of Schottky junction and S heterojunction to simultaneously realize efficient pollutants degradation and power generation.
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Journal of Water Process Engineering
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2024
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IF 6.3
Hongshan Jia,Yingqing Zhan,Fei Zhu,Ximin Chen,Yajie Lei,Xinyue Duan,Jie Liu
In the practical purification of oily wastewater, the application of polymer-based membrane is greatly restricted due to the oil adhesion and complicated fouling problems. Herein, to conquer the aforementioned challenges, we prepared the polyphenol mediated Photo-Fenton self-cleaning and superhydrophilic/underwater superoleophobic α-FeOOH/g-C 3 N 4 @PVDF composite membrane via simple vacuum-assisted self-assembly technology. The g-C 3 N 4 nanosheets modified by tannic acid were introduced into the surface of PVDF ultrafiltration membrane, in which the intercalation structure was regulated by the random interpenetration of α-FeOOH nanorods . The abundant hydroxyl and amino groups and the rough micro-nano structure formed by intercalation structure were favorable for the superhydrophilic feature (WCA = 0°, UOCA>150°), thus resulting in ultra-low oil adhesion. Specially, the intercalation structure improved the water permeation channel, further promoting the water/oil separation flux. Therefore, the composite membrane exhibited superior separation flux (452.35–650.21 L m −2 h −1 ) and separation efficiency (>99.06 %) for various surfactant-stabilized emulsions. Moreover, thanks to the Photo-Fenton reaction, the composite membrane showed excellent degradation efficiency on simulated pollutants (various dyes) within 60 min (MeB: 95.55 %, CR: 90.83 %, MO: 98.90 %, CV: 95.11 %), showing satisfactory photocatalytic self-cleaning performance. This work provides a strategy for the potential application of polymer-based membranes in the treatment of complex surfactant-stabilized emulsion wastewater from petrochemical industry.
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Journal of Environmental Chemical Engineering
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2025
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IF 7.2
Yibing Feng,Kun Qiao,Xiaohan Jiang,Huiling Ji,Jiang Meng,Jigang Wang
A photocatalysis–self-Fenton system (PSFs) offers a viable solution to the continuous hydrogen peroxide (H 2 O 2 ) dosing and insufficient Fe 2 + regeneration challenges in conventional Fenton chemistry. An oxygen-doped g-C 3 N 4 microrod (OCNT)-based PSFs was synthesized via a facile oxalic acid-mediated supramolecular self-assembly route, enabling efficient pollutant degradation. In situ H 2 O 2 production was achieved through a two-electron oxygen reduction reaction (2e − -ORR), with photogenerated electrons accelerating Fe 2+ /Fe 3+ cycling and enhancing H 2 O 2 utilization. The system exhibited an apparent rate constant of 0.071 min −1 for tetracycline (TC) removal, 12.2- and 4.2-fold higher than pristine g-C 3 N 4 and a photo-Fenton system, respectively. Density functional theory (DFT) calculations and experimental results indicated that oxygen heteroatom doping increased the molecular dipole moment and optimized the band structure, while the one-dimensional microrod morphology exposed abundant active sites. These synergistic effects facilitated charge-carrier separation, improved interfacial mass transfer, and promoted the two-electron oxygen-reduction pathway, thereby accelerating Fe 2+ /Fe 3+ cycling and hole oxidation. The platform demonstrated broad pH adaptability, strong anti-interference capability, and long-term operational stability. This work provides an effective strategy for on-site H 2 O 2 generation and utilization in photocatalytic–Fenton systems for the degradation of organic contaminants.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2025
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IF 9.7
Xiao Han,Xiujuan Zhong,Fanpeng Meng,Jinsheng Zhao,Jun Yang,Yongfa Zhu,Qian Xu,Jun Hu,Ningqiang Zhang
Building polymer heterojunctions (PHJs) is a promising way to enhance the performance of single-polymer photocatalysts, but it's still challenging to design the ideal structure with well-matched energy levels and strong interface synergy by precisely tuning the molecular structure of polymer. Herein, two triazine-based conjugated porous polymers (CPPs) were synthesized in advance including TB and TR via linkage unit modulation at the molecular level, and then their PHJs with carbon nitride (g-C 3 N 4 ) nanosheet including TB/CN and TR/CN were successfully constructed by the convenient physical ball milling method. Theoretical calculations, electron paramagnetic resonance (EPR), and in situ X-ray absorption near-edge structure (XANES) spectra show that replacing thiophene rings in TR with phenyl rings in TB changes the PHJ structure from type-I (TR/CN) to an S-scheme (TB/CN) heterojunction. Compared to TR/CN, TB/CN exhibits a stronger internal electric field (IEF), better redox ability, longer exciton lifetime, and improved charge separation and transport. As a result, TB (Wang et al., 2023a (20))/CN achieves a much higher hydrogen evolution rate (HER) of 9.11 mmol g −1 h −1 , which is 1.8 times of TR (Wang et al., 2023a (20))/CN and 6.6 times of pure g-C 3 N 4 . TB (Wang et al., 2023a (20))/CN also shows superior Cr(VI) reduction efficiency (98.5 % in 60 min), outperforming TR (Wang et al., 2023a (20))/CN (82.0 %) and g-C 3 N 4 (21.8 %). This study shows that adjusting the linkage units can effectively tune the interface properties of PHJs, offering a promising strategy for designing efficient polymer-based photocatalysts.
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JOURNAL OF ENVIRONMENTAL MANAGEMENT
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2025
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IF 8.4
Yaxing Bai,Xuefeng Hu,Huixian Du,Meng Gao,Zilong Li,Yuhuan Fei
To expand the utilization of discarded walnut shells and enhance the photocatalytic activity of graphitic carbon nitride(g-C 3 N 4 ), the carbon-rich graphitic carbon nitride anchored with Fe sites (FeW-CN) was synthesized via a walnut shell-based biochar-assisted strategy. Unlike the direct thermal copolymerization of melamine for g-C 3 N 4 , the iron-loaded walnut shell-based biochar (FeW) was first synthesized, followed by thermal copolymerization of melamine with FeW to form FeW-CN. The C substitution on the triazine ring enhanced the light absorption and electron migration for FeW-CN. And the Fe sites interacting with N-(C) 3 further improved the migration and the utilization rate of photogenerated carriers. During the degradation of 2-Mercaptobenzothiazole, FeW-CN showed excellent photocatalytic performance and stability compared with g-C 3 N 4 . Moreover, FeW-CN maintained excellent photocatalytic performance in river water. Combination of electron paramagnetic resonance with active species quenching experiments, the synergistic mechanism of singlet oxygen, holes, and superoxide radicals was confirmed in the FeW-CN system. Compared to g-C 3 N 4 , the Fe sites and C substitution enhanced the production of singlet oxygen.
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危险品化学品经营许可证（带存储）