JOURNAL OF ALLOYS AND COMPOUNDS
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2024
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IF 5.8
Zhangwei Sun,Yuhao Qi,Kaile Wang,Jiaming Li,Xiaoyu Qiu,Yunhe Zhao,Li Guo
In this study, we developed an in-situ deposition method to load small-sized AgI nanoparticles as an oxidative photocatalyst (OP) onto phosphorus (P) and potassium (K) co-doped two-dimensional porous g-C 3 N 4 (PK-CN-N) as a reductive photocatalyst (RP), forming an S-scheme heterojunction photocatalyst AgI/PK-CN-N. PK-CN-N achieved morphology control and element doping, leading to surface functionalization and heterostructure formation for the AgI/PK-CN-N photocatalyst. Notably, the 50AgI/PK-CN-N composite demonstrated an approximately 95 % removal efficiency for RhB within 30 minutes, 17.6 times higher than pure g-C 3 N 4 , surpassing most reported g-C 3 N 4 -based photocatalysts. The enhanced photocatalytic efficiency is attributed to the surface modification strategy and heterostructure formation of g-C 3 N 4 , which broadens the visible light response range, increases the number of active sites, improves the separation of photogenerated electron-hole pairs, and enhances REDOX capabilities. The band structure of the composite was elucidated through Mott-Schottky analysis and UV–vis DRS. The formation of the AgI/PK-CN-N S-scheme heterojunction and its charge transfer mechanism was confirmed through XPS, band structure analysis, KPFM, and EPR spectroscopy. Experimental data confirmed the presence of a strong and effective interface electric field between the two semiconductors, leading to band bending and accelerated charge separation. Additionally, the introduction of small-sized AgI semiconductors enhanced the exposure of the coupling interface, further improving catalytic performance. The reusability and lifespan of the catalyst were also analyzed, showing that after four cycles, the photocatalytic activity remained above 92 %.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2024
·
IF 0
Li Longyun,Xiao Kunkun,Zhang Jinpu,Du Ruihan,Kang Chunli
This study successfully synthesized a composite photocatalyst g-C 3 N 4 /PbTiO 3 through hydrothermal and calcination methods using PbTiO 3 and g-C 3 N 4 . The catalyst was characterized by XRD, FTIR, Raman, XPS, SEM, TEM, UV–vis DRS, PL, and other techniques. The results indicate that the composite photocatalyst exhibits efficient electron transfer, enhanced light absorption, effective separation and utilization of photogenerated electron–hole pairs, demonstrating superior photocatalytic activity. Under simulated sunlight, the removal efficiency of methyl blue (MB) with an initial concentration of 10 mg/L reaches 93.0% after 120 min. After five cycles, the degradation efficiency of MB is 79.2%, still maintaining 85% of the initial catalytic activity. The pH values in the range of 4.0–7.0, inorganic anions, and water quality have a minimal impact on the photocatalytic degradation of MB. Additionally, the composite photocatalyst exhibits strong removal capabilities for other pollutants, such as tetracycline. Therefore, the prepared catalyst demonstrates good feasibility for practical applications. Free radical quenching experiments indicate that hydroxyl radicals (·OH) are the primary active groups in the photocatalytic degradation of MB. Based on this, a photocatalytic mechanism involving a S-scheme heterojunction has been proposed. This study provides new insights into preparing PbTiO 3 composite semiconductors and constructing novel S-scheme heterojunctions.
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Biosensors-Basel
·
2024
·Vol. 14
·期 12
·586
·
IF 4.9
Xiaowei Fan,Guping Zhang,Xiaodi Li,Yao Wang,Yi Wang,Shilei Hao,Defang Liu
In this study, we have proposed an electrochemiluminescence (ECL) signal amplification system which is based on two-dimensional (2D) flower-like CdS@Co/Mo-MOF composites as a co-reaction accelerator of the g-C3N4/S2O82−system for ultrasensitive detection of chlorpromazine hydrochloride (CPH). Specifically, the 2D flower-like Co/Mo-MOF with mesoporous alleviated the aggregation of CdS NPs while simultaneously fostering reactant-active site contact and improving the reactant–product transport rate. This allowed the material to act as a novel co-reaction accelerator, speeding up the transformation of the S2O82−into SO4•−and enhancing the cathodic ECL emission of g-C3N4. Moreover, the signal probe which was synthesized by coupling the 2D CdS@Co/Mo-MOF and graphitic carbon nitride (g-C3N4) achieved the generation of SO4•−in situ and reduced energy loss. The results confirmed that the ECL signal was enhanced 6.2-fold and stabilized by CdS@Co/Mo-MOF. Based on the extremely strong quenching effect of chlorpromazine hydrochloride (CPH) on this system, a “signal-off” type sensor was constructed. The sensor demonstrated excellent sensitivity and linear response to CPH concentrations ranging from 1 pmol L−1to 100 μmol L−1, with a low detection limit of 0.4 pmol L−1(S/N = 3).
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Journal of the Taiwan Institute of Chemical Engineers
·
2025
·
IF 6.3
Yanhua Cui,Yixuan Hong,Weilong Shi,Zengkai Wang
Background Photocatalytic membrane technology has attracted widespread concern in the field of water purification due to its high-efficiency and eco-friendly. However, the active sites of photocatalyst are easily embedding in the polymer membrane, consequently reducing degradation efficiency of photocatalytic membrane. Methods In this study, two-dimensional/two-dimensional regenerated silk fibroin-carbonized carbon modified graphite carbon nitride/bismuth vanadate heterojunction (2D/2D C-g-C 3 N 4 /BiVO 4 ) with excellent photocatalytic performance was synthesized by electrostatic self-assembly method. Then C-g-C 3 N 4 /BiVO 4 heterojunction was selected as catalytic structural units, three-dimensional (3D) interfacial networked poly(vinylidene fluoride) membrane-supported C-g-C 3 N 4 /BiVO 4 heterojunction (C-g-C 3 N 4 /BiVO 4 /PVDF) was fabricated by electrospinning technique. The combination of C-g-C 3 N 4 /BiVO 4 heterojunction and interfacial networked PVDF membrane synergistically enhanced their permeability, antifouling and antibacterial performance. Significant findings The optimized C-g-C 3 N 4 /BiVO 4 /PVDF photocatalytic membrane had higher degradation TC efficiency (83.33 %) than other membrane samples, and the efficiency of bacterial inactivation of C-g-C 3 N 4 /BiVO 4 /PVDF could reach 99.00 %. The C-g-C 3 N 4 /BiVO 4 /PVDF exhibited tremendous enhancement in the permeability (13,488.2 L m −2 h −1 ) and flux recovery efficiency (94.44 %). The free radical trapping tests and ESR spectra indicated that superoxide radical (·O 2 ⁻ ) was the dominant active species. In addition, the as-prepared C-g-C 3 N 4 /BiVO 4 /PVDF could easily recover and reuse, and photocatalytic activity basically remain unchanged, highlighting the potential application of membrane photocatalyst for the practical wastewater treatment.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2024
·
IF 4.9
Chengmin Hou,Weimin Yan,Hanxiao Ma,Yuan Bai,Zhiting Yuan
Heavy metal ion (Cu(II)) wastewater will do great harm to human body and environment, and the adsorption materials used in traditional adsorption methods are easy to hydrolyze, resulting in secondary pollution to water. In this paper, an adsorption material poly(glycidyl methacrylate-random-hydroxyethyl methacrylate) grafted ferric oxide@starch (St/Fe 3 O 4 - g -p(GMA- r -HEMA)) was prepared, which had epoxy and hydroxyl group , easy to produce crosslinking, reduce the sensitivity of starch to pH and prevent hydrolysis. Infrared spectroscopy (FTIR), thermogravimetric analysis (TG), scanning electron microscopy (SEM) and magnetometer (VSM) were used to characterize the structure and morphology of the adsorbent. The adsorption properties of the adsorbent for removal of Cu(II) ions were studied via changing the experimental conditions, including the amount of adsorbent, Cu(II) ions solution concentration, pH value, adsorption time, adsorption temperature and so on. Under the optimal adsorption conditions of pH value 7, initial Cu(II) concentration 20 mg/L and adsorption time 160 min, the maximum unit adsorption capacity of St/Fe 3 O 4 - g -p(GMA- r -HEMA) was 94.15 mg/g, and the adsorption performance was good. The adsorption process followed Langmuirm model and second-order kinetic model , and was dominated by chemisorption . The thermodynamic model showed that the adsorption process of St/Fe 3 O 4 - g -p(GMA- r -HEMA) was endothermic. After 8 adsorption cycles, 93.5% of the first adsorption effect can still be retained, and the renewable performance had been improved.
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RESEARCH ON CHEMICAL INTERMEDIATES
·
2024
·Vol. 50
·期 6
·2455-2476
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IF 2.8
Yan Jia,Hu Cheng,Zhang Lianhong
Graphitic carbon nitride (g-C 3 N 4) faces limitations in its photocatalytic applications due to its inherently wide bandgap (2.7 eV), low utilization of visible light, and a high rate of recombination of photogenerated electron–hole pairs. Defect engineering can effectively enhance the ability of g-C 3 N 4 photocatalysts to address environmental pollution. In this paper, g-C 3 N 4 materials with N defects (AA-CN15) were successfully prepared by using urea as a hydrogen bond donor and ammonium acetate as a hydrogen bond acceptor. The catalyst exhibits a broader range of visible light absorption, a lower rate of photogenerated electron–hole recombination, and a larger specific surface area, thanks to the formation of N defects in the N1 (C=N–C) vacancy. The formation of N defects reduces the band gap width of AA-CN15 from 2.85 eV to 1.90 eV compared to U-CN. The degradation rate of AA-CN15 in a 30 mg/L MB solution under visible light irradiation can reach 91.4% within 100 min, which is 7.2 times higher than that of U-CN. This study addresses the limitations and drawbacks of traditional defect introduction methods, offering a novel approach for the synthesis of N defect g-C 3 N 4 materials.
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Journal of Water Process Engineering
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2024
·
IF 6.3
Bingkun Liu,Guanghui Wang,Jinyang Li,Beibei Liu,Ruoyu Li,Hongda Huang,Hengzhen Shi,Jingtao Zhang
MoS 2 quantum dots decorated g-C 3 N 4 /AgI Z -scheme heterostructures were successfully prepared and applied in tetracycline hydrochloride (TCH) degradation and Escherichia coli ( E. coli ) disinfection upon visible light exposure. The ternary heterojunction achieved highly efficient photocatalytic abilities, which could eliminate 82.8 % of TCH in 50 min and absolutely kill E. coli in 40 min, superior to those of bare g-C 3 N 4 , AgI, g-C 3 N 4 /MoS 2 and g-C 3 N 4 /AgI binary composites. Benefiting from the Z -scheme heterostructure, the separation and migration efficiency of charge carriers in the g-C 3 N 4 /MoS 2 /AgI composite was greatly improved, which led to more effective production of predominant O 2 − and OH during the photocatalytic process. This work delivered an example of highly efficient composite photocatalyst and discussed the role of MoS 2 QDs as charge transfer mediator in Z -scheme photocatalytic system.
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ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Junjie Wang,Zhihao Lu,Kun Gao,Xing Kang,Chengcheng Zhu,Furong Qiao,Haonan Chen,Zhuoyao Li,Wei Huang,Gang Lu
Photocatalytic reforming of ethanol provides an effective way to produce hydrogen energy using natural and nontoxic ethanol as raw material. Developing highly efficient catalysts is central to this field. Although traditional semiconductor/metal heterostructures (e.g., Rh/TiO2) can result in relatively high catalyst performance by promoting the separation of photoinduced hot carriers, it will still be highly promising to further improve the catalytic performance via a cost-effective and convenient method. In this study, we developed a highly efficient photocatalyst for ethanol reformation by preparing a ternary composite structure of Rh/TiO2/g-C3N4. Hydrogen is the main product, and the reaction rate could reach up to 27.5 mmol g–1 h–1, which is ∼1.41-fold higher than that of Rh/TiO2. The catalytic performance here is highly dependent on the wavelength of the light illumination. Moreover, the photocatalytic reforming of ethanol and production of hydrogen were also dependent on the Rh loading and g-C3N4:TiO2 ratio in Rh/TiO2/g-C3N4 composites as well as the ethanol content in the reaction system. The mechanism of the enhanced hydrogen production in Rh/TiO2/g-C3N4 is determined as the improvement in the separation of photoinduced hot carriers. This work provides an effective photocatalyst for ethanol reforming, largely expanding its application in the field of renewable energy and interface science.
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Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Hongbin He,Bolong Liang,Shumin Lin,Yan Chen,Xin Zhang,Shu-Xuan Liang
The residues of oxytetracycline hydrochloride (OTC) in water have potential adverse effects on human health and ecological environment. Photocatalytic degradation has been widely studied in the treatment of antibiotic pollution due to its environmentally friendly and efficient characteristics. However, the band gap of traditional photocatalysts is too wide, and the recombination of photogenerated electrons and holes is serious, which has negative effects on photocatalysis . Therefore, the Z-scheme heterojunction g-C 3 N 4 @MIL-101(Fe) composite photocatalyst was synthesized by high temperature calcination combined with solvothermal method. g-C 3 N 4 @MIL-101(Fe) was characterized by XRD, FTIR , SEM, TEM and other tests. All the results showed that the compound was successful A series of photoelectric tests showed that g-C 3 N 4 @MIL-101(Fe) has a narrower band gap, stronger light absorption ability, and improved the separation rate of photogenerated electrons and holes. Under visible light irradiation, g-C 3 N 4 @MIL-101(Fe) could remove 87.68% of OTC in 300 min. g-C 3 N 4 @MIL-101(Fe) showed good potential for practical application in five real water samples and stability after six cycles. Finally, superoxide radicals and hole radicals were identified as the main reactive species in the photodegradation process. The mechanism and pathway of the photocatalytic degradation of OTC by g-C 3 N 4 @MIL-101(Fe) are proposed. This work expands the construction and application of Fe-MOF based Z-scheme heterostructure and provides a new idea for water pollution remediation.
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ANALYTICA CHIMICA ACTA
·
2024
·
IF 5.7
Kai Shi,Yi Tian,Sujun Liu,Wenjie Luo,Keer Liu,Lin Zhang,Ying Zhang,Jiali Chang,Jiaheng Zhang,Shuo Wang
Background Clustered regularly interspaced short palindromic repeats (CRISPR)/Cas12a-powered biosensor with a G-quadruplex (G4) reporter offer the benefits of simplicity and sensitivity, making them extensively utilized in detection applications. However, these biosensors used for monitoring pollutants in environmental water samples may face the problem of high background signal and easy interference due to the “signal-off” output. It is obvious that a biosensor based on the CRISPR/Cas12a system and G4 with a “signal on” output mode needs to be designed for detecting environmental pollutants. Results By using phosphorothioate-modified G4 as a reporter and catalytic hairpin assembly (CHA) integrated with Cas12a as an amplification strategy, a “signal-on” colorimetric/photothermal biosensor (psG4-CHA/Cas) for portable detection of environmental pollutants was developed. With the help of functional nucleotides, the target pollutant (kanamycin or Pb 2+ ) triggers a CHA reaction to produce numerous double-strand DNA, which can activate Cas12a′s trans -cleavage activity. The active Cas12a cleaves locked DNA to release caged psG-rich sequences. Upon binding hemin, the psG-rich sequence forms a psG4/hemin complex, facilitating the oxidation of the colorless 3,3′,5,5′-tetramethylbenzidine (TMB) into the blue photothermal agent (oxTMB). The smartphone was employed for portable colorimetric detection of kanamycin and Pb 2+ . The detection limits were found to be 100 pM for kanamycin and 50 pM for Pb 2+ . Detection of kanamycin and Pb 2+ was also carried out using a portable thermometer with a detection limit of 10 pM for kanamycin and 8 pM for Pb 2+ . Significance Sensitive, selective, simple and robust detection of kanamycin and Pb 2+ in environmental water samples is achieved with the psG4-CHA/Cas system. This system not only provides a new perspective on the development of efficient CRISPR/Cas12a-based “signal-on” designs, but also has a promising application for safeguarding human health and environmental monitoring.
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高影响因子
Cell Communication and Signaling
·
2024
·Vol. 22
·期 1
·1-21
·
IF 8.2
Wu Chengyan,Hu Li,Liu Bing,Zeng Xingyue,Ma Haixiang,Cao Yongkai,Li Huijun,Zhang Xiaohan
Background Desensitization of G protein–coupled receptors (GPCRs) refers to the attenuation of receptor responsiveness by prolonged or intermittent exposure to agonists. The binding of β-arrestin to the cytoplasmic cavity of the phosphorylated receptor, which competes with the G protein, has been widely accepted as an extensive model for explaining GPCRs desensitization. However, studies on various GPCRs, including dopamine D 2 -like receptors (D 2 R, D 3 R, D 4 R), have suggested the existence of other desensitization mechanisms. The present study employed D 2 R/D 3 R variants with different desensitization properties and utilized loss-of-function approaches to uncover the mechanisms underlying GPCRs homologous desensitization, focusing on the signaling cascade that regulates the ubiquitination of AKT. Results AKT undergoes K8/14 ubiquitination by TRAF6, which occurs in the nucleus and promotes its membrane recruitment, phosphorylation and activation under receptor desensitization conditions. The nuclear entry of TRAF6 relies on the presence of the importin complex. Src regulates the nuclear entry of TRAF6 by mediating the interaction between TRAF6 and importin β1. Ubiquitinated AKT translocates to the plasma membrane where it associates with Mdm2 to phosphorylate it at the S166 and S186 residues. Thereafter, phosphorylated Mdm2 is recruited to the nucleus, resulting in the deubiquitination of β-Arr2. The deubiquitinated β-Arr2 then forms a complex with Gβγ, which serves as a biomarker for GPCRs desensitization. Like in D 3 R, ubiquitination of AKT is also involved in the desensitization of β 2 adrenoceptors. Conclusion Our study proposed that the property of a receptor that causes a change in the subcellular localization of TRAF6 from the cytoplasm to the nucleus to mediate AKT ubiquitination could initiate the desensitization of GPCRs.
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Journal of Water Process Engineering
·
2024
·
IF 6.3
Wei Gao,Xiaoying Xu,Xueqi Han,Ling Zhang,Haitao Ding,Chengxun Deng
A multicomponent system consisting of dielectric barrier discharge (DBD), g-C 3 N 4 /FOD composite catalysis, and persulfate (PS) oxidation was successfully constructed for synergistically degrading trichloroethylene. The successful preparation of the g-C 3 N 4 /FOD composite catalyst material was confirmed through various testing methods, including Scanning Electron Microscope (SEM), X-Ray Diffraction (XRD), Fourier Transform Infrared Spectrometer (FT-IR), X-ray Photoelectron Spectroscopy (XPS) and Electrochemical workstation. Under this composite system, trichloroethylene degradation efficiency in water reached 93.2 % after an 8-minute reaction. Thermal gravimetric analysis (TG) and cyclic usage experiments both demonstrated the excellent stability of the g-C 3 N 4 /FOD catalyst removal efficiency of the composite as concentration, DBD discharge voltage and carrier gas flow rate, g-C 3 N 4 /FOD dose, and PS concentration. Optimal treatment conditions were determined through response surface methodology (RSM) experiments. Within a reaction time of 30 min, a total organic carbon (TOC) removal rate of 87.4 % was achieved, effectively reducing intermediate product formation and making the combined process more environmentally friendly than individual treatments. Experimental evidence SO 4 − , OH and O 2− played dominant roles during trichloroethylene degradation in water. Gas chromatography–mass spectrometry analysis identified potential pathways for trichloroethylene degradation and revealed two major intermediate products. Toxicity prediction results for these degradation products showed lower acute toxicity and chronic toxicity compared to the precursor compound.
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