JOURNAL OF ALLOYS AND COMPOUNDS
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2021
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IF 5.316
Anjli Sharma,Sanjeev Kumar Kanth,Shishi Xu,Ni Han,Lei Zhu,Lele Fan,Chao Liu,Qinfang Zhang
A highly potential visible light active g-C 3 N 4 /Bi 4 NbO 8 X (Cl, Br) heterojunction photocatalysts were constructed at the interface of the coupling between Bi 4 NbO 8 X (Cl, Br) and g-C 3 N 4 . The band gap value of heterojunctions g-C 3 N 4 /Bi 4 NbO 8 Br-20% (CNBNB-3), g-C 3 N 4 /Bi 4 NbO 8 Cl-20% (CNBNC-3), and pristine materials g-C 3 N 4 (CN), Bi 4 NbO 8 Cl and Bi 4 NbO 8 Br were analyzed to be 2.68 eV, 2.69 eV and 2.74 eV, 2.46 eV and 2.48 eV, respectively. The degradation performance of optimized CNBNC-3 and CNBNB-3 photocatalysts revealed much superior removal efficiency of 97% and 84% than the pristine material for rhodamine B. The synthesized photocatalysts maintained good recyclable stability after five consecutive cycles and potentially capable of pollutant degradation. The electrochemical impedance and photoluminescence spectroscopy revealed that the migration and separation efficiency of photogenerated charge carriers of photocatalyst were boosted, while reduced recombination rate was observed. The photocatalytic reaction mechanism also revealed the superoxide ·O 2 − and • OH radicals are the main active species responsible for the pollutant degradation.
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CHEMICAL ENGINEERING JOURNAL
·
2021
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IF 13.273
Shuaizhen Li,Zhibo Zheng,Siwei Liu,Zhenguo Chi,Xudong Chen,Yi Zhang,Jiarui Xu
High-efficiency heat-dissipation materials are in urgent need in microelectronics industry in 5G era. However, large-scale, low-cost, and high-efficiency preparation technologies still have great challenges. Here, ultrahigh thermal and electric conductive graphite films prepared by graphite-phase carbon nitride (g-C 3 N 4 ) catalyzed graphitization of polyimide film (PI) were reported for the first time. The graphite film obtained from 0.25 wt% g-C 3 N 4 catalyzed polyimide graphitization (G0.25) has homogeneous and perfect graphene structure and state-of-the-art properties. The d -spacing of the graphite layers is about 0.335 nm, which is similar to the ideal layer thickness of graphene (0.334 nm). The thermal conductivity is 1781 W·m −1 ·K −1 and the conductivity is 1.63 × 10 6 S·m −1 , which is 1.49 and 2.18 times of graphite film from pure PI film, 1.94 and 2.34 times of graphite film from commercialized Kapton film (I-film), respectively. The thermal conductivity of G0.25 film is 4.52 times of Cu and 7.46 times of Al. More importantly, the addition of g-C 3 N 4 can reduce the graphitization temperature from 2800 to 2500 ℃, which can reduce the energy consumption by 20.5% in the whole polyimide graphitization process. The developed preparation technology has important guiding significance and very attractive industrial application value for the preparation of large-scale, low cost and high-quality heat dissipation materials.
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CHEMICAL ENGINEERING JOURNAL
·
2023
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IF 15.1
Weirui Chen,Siyou Fu,Xukai Li,Jing Wang,Xunan Ning,Liying Bin,Ping Li,Bing Tang,Laisheng Li
Photocatalytic ozonation (PCO) was a novel water treatment method, but the low photo-generated electron ( e - ) utilization and ambiguous ROS formation mechanism restrained its performance. Herein, C vacancy and F co-decorated g-C 3 N 4 (FCN_Cv) was designed to accelerate the PCO performance with sodium p -perfluorinated nonoxybenzenesulfonate (OBS) acting as model pollutant. Comparative characterizations revealed that FCN_Cv remained the inherent structure of g-C 3 N 4 (BCN), and had an enhanced conduction band potential, narrower band gap and longer e - lifetime. FCN_Cv exhibited the greater activity over BCN, with 99.3 % OBS removal in 30 min but only 78.3 % for BCN during PCO process. •OH was the main ROS for degrading OBS. The greater •OH yield was obtained by FCN_Cv PCO process because of the increase of e - utilization. On one hand, the two electrons reduction of O 2 into H 2 O 2 on FCN_Cv was accelerated, which triggered the peroxone reaction between photogenerated-H 2 O 2 and O 3 . On the other hand, the direct one electron reduction of O 3 by e - also accounted for •OH generation. 17 kinds of intermediates were detected and the OBS degradation routes were inferred, which was involved with hydroxylation, C-O cleavage and aromatic ring opening reactions. Overall, this study demonstrated the feasibility of decorating F element and C vacancy on g-C 3 N 4 in enhancing e - utilization and •OH generation during PCO process as well as deepened the understanding of fate of OBS in PCO process.
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ANALYTICA CHIMICA ACTA
·
2026
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IF 6.1
By Lei Feng,Qiuting Wang,Wenwen Xu,Pinghua Ling
An ATP/pH AND DNA nanodevice in situ DNA channel assembly. • Fusogenic liposomes anchor the nanodevice to cancer cell membranes. • Logic activation yields a FRET signal for tumor-responsive imaging. • Assembled G-quadruplex channels on cell surface promote intracellular K + efflux and induces cell apoptosis. Background Precise recognition of the tumor microenvironment (TME) coupled with selective activation of therapeutic functions remains a major challenge in precision medicine. To address this, we present a fusogenic liposome-anchored DNA nanodevice that performs an AND logic operation in response to ATP and acidic pH and undergoes in situ assembly on the plasma membrane. Results The nanodevice comprises two transmembrane DNA strands (S1 and S2) containing pH-responsive i-motif switches and split G-quadruplex segments that are sequestered by ATP-binding aptamers. Upon fusion with the cell membrane, TME-specific stimuli trigger the structural reconfiguration of the nanodevice. Acidic conditions induce i-motif folding, bringing the two strands into proximity, while ATP binding displaces the aptamer locks. Under acidic and ATP-rich conditions, aptamer release and i-motif folding jointly promote membrane-localized assembly of a G-quadruplex structure. The nanodevice showed a ratiometric fluorescence response to pH and ATP, including a linear ATP response from 0.2 to 1.0 mM with a detection limit of 0.097 mM. The assembled G-quadruplex structure acted as an artificial transmembrane ion channel, induced intracellular K + depletion, mitochondrial membrane depolarization, caspase-3 activation, and apoptosis. Significance This work provides a proof-of-concept strategy for logic-gated ion interference under tumor-mimicking extracellular conditions, highlighting the utility of DNA nanodevices in translating multiple microenvironmental stimuli into targeted cellular perturbations. A fusogenic liposome-anchored DNA nanodevice was developed for the in situ assembly of artificial ion channels to drive tumor-specific potassium efflux and apoptosis. Download: Download high-res image (362KB) Download: Download full-size image
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MICROCHEMICAL JOURNAL
·
2023
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IF 4.8
Shaoming Yang,Jiayi Chen,Long Yan,Yongxin Liu,Wenlin Zha,Zhili Fang,Jiali Zhang
A molecularly imprinted photoelectrochemical sensor was successfully designed for sensitive detection of norfloxacin (NOR) based on poly ( o -phenylenediamine) (PoPD) sensitized g-C 3 N 4 /Zr-MOFs(Fe) composite. Herein g-C 3 N 4 /Zr-MOFs(Fe) heterojunction composite was explored as photoresponsive oxidase mimic and photoactive material for the purpose of enhancing photoelectrochemical performances. In addition, PoPD molecularly imprinted polymers (MIPs) were introduced not only to act as the recognition element for selective performance, but also to possess photosensitive effect, which enhanced the photocurrent of sensor. SEM, element mapping method, XRD, UV–Vis and electrochemical impedance spectroscopy were employed for the characterization of the structural, chemical composition, optical and electrical properties of g-C 3 N 4 /Zr-MOFs(Fe) composite. Thanks to the photoresponsive oxidase mimic property and the selectivity of MIPs, the as-prepared sensor presented a good linear range of from 1.0 × 10 −8 mol/L to 2.0 × 10 −6 mol/L with NOR and a limit of detection of 5.7 × 10 −9 mol/L. Moreover, the sensor platform has been proved to have excellent selectivity and real sample application.
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NEW JOURNAL OF CHEMISTRY
·
2023
·Vol. 47
·期 47
·21944-21959
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IF 3.3
Xuanlan Luo,Jinhai Yuan,Junhong Liu,Haikun Hu,Ziyi Yang,Xiaopeng Hou,Qi Sun,Di Xu
Ultrasonic assisted hydrothermal and calcination methods were used to prepare type II heterojunction ZnBi2O4/g-C3N4 (ZBN) photocatalysts. The crystal structures, elemental compositions, morphologies and optical properties of the prepared monomer and heterojunction photocatalysts were characterized. The photocatalytic degradation efficiency of acid red B reached 95% in 180 min under UV irradiation, which was 1.82 and 1.44 times higher than that of g-C3N4 and ZnBi2O4, respectively, and the reaction rate constants were increased from 0.004 min−1 and 0.005 min−1 to 0.015 min−1. ZBN exhibited high photocatalytic activity, and the enhancement of activity can be attributed to the construction of the type II heterostructure and reduced carrier recombination. The degradation experiments of carmine, AO7, MO, MB and RhB showed that the composite ZBN had a better degradation effect on different dyes. The results of radical trapping experiments and EPR tests showed that ˙O2− plays a crucial role in the photocatalytic degradation of acid red B. Finally, the mechanism of the photocatalytic degradation of acid red B by ZBN was investigated by combining EPR, VB-XPS and radical trapping experiments.
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LANGMUIR
·
2023
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IF 3.9
Yanting Dou,Yu Gao,Deng Gu,Jiqi Zheng,Bo Zhang,XiuXin Li,Meijia He,Qinglong Zou,Tiaoli Liao,Fu Ding,Yaguang Sun,Zhenhe Xu
Developing a photocatalyst that can effectively utilize the full solar spectrum remains a high-priority objective in the ongoing pursuit of efficient light-to-chemical energy conversion. Herein, the ternary nanocomposite g-C3N4/RGO/W18O49 (CN/RGO/WO) was constructed and characterized by a variety of techniques. Remarkably, under the excitation of photon energies ranging from the ultraviolet (UV) to the near-infrared (NIR) region, the photocatalytic performance of the CN/RGO/WO nanocomposite exhibited a significant enhancement compared with single component g-C3N4 or W18O49 nanosheets for the degradation of methyl orange (MO). The MO photodegradation rate of the optimal CN/1.0 wt% RGO/45.0 wt% WO catalyst reached 0.816 and 0.027 min–1 under UV and visible light excitation, respectively. Even under low-energy NIR light, which is not sufficient to excite g-C3N4, the MO degradation rate can still reach 0.0367 h–1, exhibiting a significant enhancement than pure W18O49. The outstanding MO removal rate and stability were demonstrated by CN/RGO/WO nanocomposites, which arise from the synergistic effect of localized surface plasmon resonance effect induced by W18O49 under vis–NIR excitation and the Z-scheme nanoheterojunction of W18O49 and g-C3N4. In this work, we have exploited the great potential of integrating nonmetallic plasmonic nanomaterials and good conductor RGO to construct high-performance g-C3N4-based full-solar spectral broadband photocatalysts.
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MOLECULES
·
2023
·Vol. 28
·期 23
·7810
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IF 4.6
Truong Nguyen Xuan,Dien Nguyen Thi,Quang Tran Thuong,Tue Nguyen Ngoc,Khanh Dang Quoc,Zsombor Molnár,Shoaib Mukhtar,Erzsébet Szabó-Bárdos,Ottó Horváth
Graphitic carbon nitride (g-C3N4) has proved to be a promising heterogeneous photocatalyst in the visible range. It can be used, among others, for the oxidative conversion of environmentally harmful nitrophenols occurring in wastewater. However, its photocatalytic activity needs to be enhanced, which can be achieved by modification with various dopants. In our work, copper-modified g-C3N4was prepared by ultrasonic impregnation of the pristine g-C3N4synthesized from thiourea. The morphology, microstructure, and optical properties of the photocatalysts were characterized by XRD, FT-IR, DRS, SEM, XPS, and TEM. DRS analysis indicated a slight change in both the CB and the VB energies of Cu/g-C3N4compared to those of g-C3N4. The efficiency of the photocatalysts prepared was tested by the degradation of nitrophenols. Copper modification caused a sevenfold increase in the rate of 4-nitrophenol degradation in the presence of H2O2at pH = 3. This dramatic enhancement can be attributed to the synergistic effect of copper and H2O2in this photocatalytic system. A minor Fenton reaction role was also detected. The reusability of the Cu/g-C3N4catalyst was demonstrated through five cycles. Copper-modified g-C3N4with H2O2proved to be applicable for efficient visible-light-driven photocatalytic oxidative degradation of nitrophenols.Keywords:graphitic carbon nitride;photocatalysis;copper-modification;oxidation of nitrophenols;visible-light irradiation;pH effect;H2O2effect
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RSC Advances
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2023
·Vol. 13
·期 41
·28550-28559
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IF 3.9
Xiaohua Xu,Huye Li,Yapeng Sun,Tianfeng Ma,Lin Shi,Wencheng Mu,Huan Wang,Yongchang Lu
Cr3+ is one of the most essential trace elements in living organisms and plays a vital role in human metabolism. However, both deficiency and excess intake of Cr3+ can be harmful to the human body. Therefore, the quantitative determination of Cr3+ is of great significance in the field of life science. Based on this, in this study, a g-CNQDs@p-acetaminophenol fluorescence sensing system was developed for the quantitative detection of Cr3+ in actual complex samples. G-CNQDs were synthesized with sodium citrate and urea as precursors. The fluorescence signal was enhanced by the synergistic effect between p-acetaminophenol (APAP) and g-CNQDs. The fluorescence quenching phenomenon can be produced when Cr3+ is introduced into the fluorescence-enhanced g-CNQDs@p-acetaminophenol system. An “on–off” fluorescence sensing system was constructed based on g-CNQDs@p-acetaminophenol for the quantitative detection of Cr3+. The experimental data showed a wide linear region in the concentration range of 0.64–63.0 μM, and the detection limit was as low as 0.23 μM. The construction of the sensor system broadens the research field for the practical application of Cr3+.
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SENSORS AND ACTUATORS A-PHYSICAL
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2023
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IF 4.6
Ruizhen Li,Wanzhen Yuan,Yu Hu,Yonggang Zeng
Propranolol , a widely used β-adrenergic receptor antagonist drug with potential toxic effects to organisms and human beings, was not completely removed from environment through traditional wastewater treatments . It is necessary to sensitively and selectively monitor the trace content propranolol in various samples. In this work, a novel photoelectrochemical (PEC) aptasensor based on Au nanoparticles (NPs) modified g-C 3 N 4 /BiPO 4 heterojunction was successfully fabricated for detecting (S)-propranolol (S-Pro), an important racemic enantiomer of propranolol. Herein, g-C 3 N 4 was employed as visible light-active semiconductor. The photocatalytic activity of g-C 3 N 4 was enhanced via forming heterojunction with BiPO 4 to facilitate the separation and migration of photogenerated carriers . In addition, Au NPs with perfect conductivity and surface plasmon resonance (SPR) effect are not only beneficial to the electron transfer and visible light harvest of g-C 3 N 4 /BiPO 4 heterojunction, but also the crucial factor on assembling S-Pro-binding DNA aptamer via Au-S bonding. At the same time, as a π-π conjugated material, g-C 3 N 4 with large surface area also provides an excellent platform for loading Au NPs. Under the visible light illumination, the PEC aptasensor displayed high PEC performance. On such a sensor, specific captured S-Pro by the aptamer was quickly oxidized by the photogenerated holes to inhibit the recombination of the photogenerated carriers, enhanced the PEC response, and realized the detection of S-Pro. Under optimal conditions, the designed PEC aptasensor exhibited a wide linear range of 10 nM to 1000 nM with a low detection limit (defined as S/N = 3) of 2.55 nM. Moreover, the proposed sensor displayed high selectivity , good reproducibility, and general long-term stability. And the S-Pro in real sample was accurately detected using this proposed sensor.
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CARBOHYDRATE POLYMERS
·
2023
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IF 11.2
Hongxu Liu,Junhao Xie,Ziyi Hu,Jingxuan Zhao,Ruijia Wang,Yuchao Qi,Shulin Sun
This work obtained separation membranes with UV-cleaning performance by adding TiO 2 -g-CS/CNTs photocatalyst to the PVDF . The positively charged chitosan (CS) and negatively charged carboxylic carbon nanotube (CNTs-COOH) can be self-assembled into the bilayer structure on the surface of TiO 2 particles through electrostatic attraction. The presence of many hydrophilic groups in CS and CNTs-COOH significantly improves the hydrophilicity of TiO 2 -g-CS/CNTs-PVDF membrane, and helps TiO 2 to be uniformly dispersed on the upper surface. TiO 2 -g-CS/CNTs promote the change of pore structure and expand the flux of the modified membrane to 4.5 times that of pure PVDF . Zeta potential demonstrates that the TiO 2 -g-CS particles successfully attracted CNTs in the PVDF matrix, and the membrane surface was still positively charged. Thus, the combined effect of the positively charged TiO 2 -g-CS and the highly adsorbed CNTs enhanced the retention of the contaminants. More importantly, there is a charge transfer between the grafted CS and TiO 2 interface to obtain a broader light absorption band. The excitation carriers provided by CNTs significantly contribute to the photocatalytic performance after transfer between TiO 2 and CS; thus, TiO 2 -g-CS/CNTs-PVDF produces higher photocatalytic activity for dye molecules (degradation rate > 97 %).
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WATER AIR AND SOIL POLLUTION
·
2023
·Vol. 234
·期 10
·1-14
·
IF 2.9
Jiang Huize,Yang Jinge,Wang Xinxin,Wang Aihong,li Yuzhi,Wang Jinyu
The massive use of acetaminophen (APAP) poses a potential crisis for humans and the environment. In this paper, the degradation of APAP in aqueous solution was carried out using photocatalytic synergistic persulfate oxidation. To enhance the photocatalytic activity of g-C 3 N 4 and thus activate the persulfate (K 2 S 2 O 8 , PS) more effectively, the heterojunction photocatalyst TiO 2 /g-C 3 N 4 (TCN) was prepared by a hydrothermal method. The TCN-PS catalytic system showed a high efficiency for APAP degradation. When the amount of TCN and PS added was 0.6 g/L, the degradation rate of APAP at 10 mg/L was 78.3% after 60 min of illumination. Moreover, the TCN-PS catalytic system was effective in removing organic pollutants in acidic, neutral, and weakly alkaline environments. The radical quenching experiment results indicate that both sulfate radicals (SO 4 − •) and hydroxyl radicals (•OH) are involved in the degradation reaction. After five cycles, the TCN-PS catalytic system still has stable catalytic activity.
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