Applied Materials Today
·
2024
·
IF 7.2
Guobo Huang,Siqi Huo,Jiahao Ren,Wei Chen,Haiqin Yang,Shenwei Xiao,Tianle Wang,Hong Peng,Pingan Song
The nanomaterials have been deeply explored as flame retardants for various polymeric materials due to their multifunctionality, but they often fail to significantly increase the limiting oxygen index (LOI) and vertical burning UL-94 rating, thus unable to meet industrial needs (LOI>27.0 % and UL-94 V-0 rating). Herein, we fabricated a cerium/phosphorus-doped g-C 3 N 4 (Ce/P-CN) nanohybrid as a multifunctional high-efficiency fire retardant for acrylonitrile–butadiene–styrene (ABS). The Ce/P-CN nanoflakes featured a strengthening effect towards ABS, 10 wt% of which increased the tensile strength of ABS/(Ce/P-CN) by 33.8 %. Meanwhile, the ABS/(Ce/P-CN) nanocomposites showed remarkably enhanced high-temperature stability and carbonization performances relative to virgin ABS. Ce/P-CN simultaneously improved the anti-ignition, fire retardancy and smoke suppression of ABS due to the barrier effect of g-C 3 N 4 nanoflakes and the catalytic carbonization effect of cerium and phosphorus. Notably, adding 10 wt% Ce/P-CN increased the LOI and UL-94 rating of ABS to 28.6 % and V-0, respectively, demonstrating its high flame-retardant efficiency. Thus, the high flame-retardant efficiency and multifunctionality enable Ce/P-CN to outperform previous flame retardants for ABS. This work offers a novel strategy for the development of high-efficiency g-C 3 N 4 nanoflakes, which endow ABS with improved mechanical robustness and fire retardancy and show broad industrial prospects.
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MICROCHEMICAL JOURNAL
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2024
·
IF 4.9
Xuanxuan Hao,Zhimin Liu,Yaxin Li,Waner Hou,Tongtong Zheng,Leqian Hu
In this study, a near-infrared (NIR) electrochemiluminescence (ECL) emitter CdIn 2 S 4 was synthesized by a convenient hydrothermal strategy. The ECL properties of the obtained CdIn 2 S 4 were examined in the presence of potassium persulfate coreactant at an excitation potential of − 1.25 V. The low trigger voltage of CdIn 2 S 4 may be ascribed to its lower bandgap. This lower excitation potential could effectively reduce the side-effects induced by high voltages, while maintaining the biological activity of antibodides and antigens. The ECL features of CdIn 2 S 4 were also investigated, demonstrating that CdIn 2 S 4 exhibited excellent NIR characteristics, and surface state transitions led to the ECL emission. Importantly, CdIn 2 S 4 was introduced into ECL and electrochemical impedance spectroscopy (EIS) to establish a dual-mode immunosensing interface. Meanwhile, AuNPs@g-C 3 N 4 with excellent properties were used to promote electron transmission and increase the immobilization amount of zearalenone (ZEA) antibodies in the dual-mode sensing system. The developed immunosensing strategy displayed superior sensing performance in ZEA analysis. The detection limits of ZEA were 30 fg mL −1 (ECL model) and 10 fg mL −1 (EIS model), respectively. The desirable recovery results of ZEA in corn samples prove the application potential of the NIR emitter CdIn 2 S 4 in developing a dual-mode immunosensing system for early real-time use.
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Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Weirui Chen,Weijie Chen,Yimin Luo,Yanqi Feng,Xukai Li,Jing Wang,Ping Li,Liying Bin,Bing Tang,Laisheng Li
g-C 3 N 4 (CN) based catalysts were effective for photocatalytic ozonation (PCO), but their stability during reaction remained a mystery. This study investigated the change on PCO activity and stability of CN induced by F or I doping. Compared with CN, F-CN had the greater VB potential while I-CN had a greater CB position, which both led to their better O 3 activation. F-CN and I-CN PCO showed the greater oxalic acid (OA) degradation than that of CN PCO process. Though the enhanced activity, both F-CN and I-CN demonstrated the lower stability compared with that of CN. Because of the existing of reactive oxygen species (ROS) like •OH, •O 2 - and h vb + , CN, F-CN and I-CN were partially oxidized, generating NO 3 - and organic molecules such as cyanuric acid. h vb + and •OH mainly accounted for the decomposition of three CN. Triazine ring oxidation resulted in internal tearing and edge fracture as well as the formation of O-containing groups on all CN-based catalysts. O contents in catalysts initially increased and then decreased with reaction time, indicating that surface O-containing groups were unstable. The structural destroy could be eased with the present of organic pollutants. This study deepened the understanding of fate of CN based catalysts during PCO application.
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JOURNAL OF FOOD COMPOSITION AND ANALYSIS
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2024
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IF 4
Siyao Zhang,Shiyou Yu,Xin Wang,Yipeng Zhang,Zhenge Yue,Chenchen Li,Yongqiang Ma
During beekeeping, the utilization of metronidazole (MNZ) for treating bee ailments leads to the MNZ residues in honey. Prolonged ingestion of honey with MNZ residues could pose potential health hazards to humans. Therefore, the development of a straightforward and efficient MNZ detection method is of utmost importance. ZnO, a non-toxic catalytic material, exhibits promising potential in electrochemical sensor design. The resulting g-C 3 N 4 /MnO 2 /ZnO composite was employed to craft an electrochemical sensor that facilitates swift MNZ quantification in honey. Comprehensive characterization of the synthesized composites was performed, and the electrochemical behavior of MNZ was explored using cyclic voltammetry (CV) and differential pulse voltammetry (DPV). It was found that the g-C 3 N 4 /MnO 2 /ZnO composite exhibits remarkable electrocatalytic capability, and the resulted sensor demonstrates good sensitivity. Within a range of 2–250 μM, MNZ's current value showed two linear relationships with its concentration, achieving the detection limit of 0.21 μM. When applied to honey samples, the g-C 3 N 4 /MnO 2 /ZnO/GCE sensor detected MNZ with recovery rates spanning 93.7% to 100.3% and relative standard deviations (RSD) under 3%. This attributed to heightened sensitivity, selectivity, repeatability and durability of the sensor. Furthermore, its effectiveness extends to the rapid assessment of MNZ content in actual honey, highlighting its practical utility in identifying MNZ residues in honey.
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FOOD CHEMISTRY
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2024
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IF 8.5
Yue Qiu,Jiaping Yan,Xiaoling Liu,Yuting Pang,Yuting Ding,Fei Lyu
Patulin (PAT) is a hazardous mycotoxin frequently occurs in fruit industry. A reusable g-C 3 N 4 -SH@KG composite aerogel for PAT removal in a novel “dark adsorption-light regeneration” mode was prepared by thiol(-SH) functionalization and konjac glucomannan (KG) immobilization. The g-C 3 N 4 -SH@KG was characterized by SEM, FT-IR, XPS and UV–Vis DRS, and its PAT adsorption and photocatalytic regeneration behaviors and mechanisms were investigated. The g-C 3 N 4 -SH@KG exhibited good regeneration performance, maintaining 83% of PAT initial adsorption capacity (0.92 mg/g) after 5 “adsorption-regeneration” cycles. The adsorption process was endothermic and spontaneous. •OH and h + generated by photocatalysis were the main substances that degraded PAT into two products and regenerated -SH. The g-C 3 N 4 -SH@KG could effectively remove PAT without negative impact on juice quality. The study provided a new strategy for the regeneration of thiol-functionalized PAT adsorbents, and a new idea for the application of non-selective photocatalysis in the control of food contaminations.
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Surfaces and Interfaces
·
2024
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IF 5.7
Hao Sun,Martin R. Tillotson,Dawei Wang,Xu Zhao
The construction of a heterojunction piezo-photocatalyst is one of the most effective strategies to accelerate charge transfer and improve catalytic performance. A novel ternary heterojunction was synthesized by introducing SnS nanoparticles (NPs) onto the surface of a NiAl-LDH/g-C 3 N 4 (LDH/CN) nanosheets via a facile hydrothermal method. The separation and transfer paths of carriers was studied for the piezo-photocatalytic degradation of tetracycline (TC), a common antibiotic, under ultrasonic and visible light irradiation. The SnS/LDH/CN piezo-photocatalyst generated a built-in electric field by the piezoelectric effect, which was beneficial for the separation of electron-hole pairs. Furthermore, the Z-scheme heterojunction endowed with a larger surface area, abundant active sites, and improved light-harvesting capacity further improved piezo-photocatalytic performance for TC. In particular, a CLS-30 (30 wt% of SnS on LDH/CN) heterojunction exhibited the highest degradation efficiency with 98.5 % removal of TC (20 mg/L) in 60 min, which was higher than that of ultrasonic vibration (38.2 %) and visible light illumination (79.4 %). TC degradation efficiency remained at almost 90 % after 4 consecutive cycles. This work provides a novel viewpoint for designing high-performance and stable heterojunction piezo-photocatalysts for energy limited wastewater remediation applications.
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APPLIED SURFACE SCIENCE
·
2017
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IF 3.387
Lina Ma,Guohong Wang,Chuanjia Jiang,Helin Bao,Qingchuan Xu
Core-shell composites with titanium dioxide (TiO 2 ) hollow microsphere as the core and graphitic carbon nitride (g-C 3 N 4 ) as the shell were fabricated via a two-step self-assembly procedure with the assistance of ultrasonic dispersion. The as-prepared composite samples with different g-C 3 N 4 contents (0–20%) were thoroughly characterized and the photocatalytic activity was evaluated by the photocatalytic degradation of Rhodamine B (RhB) in aqueous solution under visible light. A g-C 3 N 4 layer of approximately 80 nm was successfully coated on the surface of TiO 2 hollow microspheres with a diameter of 1–3 μm, forming a heterostructure with close interfacial contact. The TiO 2 @g-C 3 N 4 composite exhibited significantly enhanced photocatalytic activity as compared with pure TiO 2 hollow microspheres. At an optimum weight ratio of g-C 3 N 4 to TiO 2 (15 wt.%), the photocatalytic activity of the composite sample was almost 3 times higher than that of reference TiO 2 hollow microspheres. Moreover, the results of recycling test indicated that the TiO 2 @g-C 3 N 4 composite had excellent stability. A possible photocatalytic reaction mechanism of TiO 2 @g-C 3 N 4 composite was proposed, in which superoxide radical anions played the major role in the oxidation of RhB, and the separation of photogenerated charge carriers across the heterostructure interface inhibited electron-hole recombination, thus enhancing the photocatalytic activity.
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APPLIED SURFACE SCIENCE
·
2024
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IF 6.3
Chenyang Xiao,Guohui Dong,Tingan Yao,Kai Han,Tingting Dong,Tong Zhou
Clay minerals are considered promising semiconductor carrier materials due to their unique physical and chemical properties. However, the exact mechanism by which clay minerals interact with semiconductor materials remains unknown. To this end, the present study was conducted to explore the formation of Brønsted acidic sites on the surface of mullite by modulating the cation types in mullite. It was hereby demonstrated for the first time that the presence of Brønsted acidic sites on the surface of clay minerals is conducive to the formation of N vacancies and dopant O in carbon nitride composites (CNM-30). The synergistic effect of N vacancy and doped O increases the specific surface area of CNM-30, enhances the electron-hole separation and transport efficiency, and ultimately makes CNM-30 produce more reactive oxygen species. CNM-30 possesses excellent degradation ability for gaseous phase pollutants (such as NO) and high concentration liquid phase pollutants (such as RhB and TC). Overall, this paper presents a new perspective on the design and development of semiconductor materials based on clay minerals.
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RESEARCH ON CHEMICAL INTERMEDIATES
·
2024
·Vol. 50
·期 7
·2971-2991
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IF 2.8
Liu Huadong,Du Kezhen,Sun Hao
In this study, nitrogen and sulfur co-doped carbon quantum dots (NSCQDs) were prepared by hydrothermal method, carbon nitride (C 3 N 4 ) was fired in a muffle furnace in an air atmosphere, and finally, the ternary heterostructure of NSCQDs, C 3 N 4 and bismuth oxide bromide (BiOBr) was synthesized by a hydrothermal method (NSCQDs/C 3 N 4 /BiOBr). The morphology of the catalyst was observed through SEM and TEM. The chemical bonds were analyzed by XPS and FT-IR to further confirm that NSCQDs and C 3 N 4 were successfully attached to BiOBr. The photocatalytic activity of the synthesized catalysts was studied by degrading RhB under simulated light source. The experiment results showed that under optimal conditions, the degradation rate of RhB by NSCQDs/C 3 N 4 /BiOBr within 20 min was as high as 99.9%, which was much higher than that of pure BiOBr (33.5%). The degradation curve was combined with a pseudo-first-order kinetic model with a kinetic constant of 0.32578 min −1 , which was 17.7 times that of BiOBr (0.01837 min −1 ). Catalyst recycling tests showed that NSCQDs/C3N4/BiOBr had extremely high stability. The active species quenching test showed that \({\text{O}}_{2}^{ \cdot - }\) and 1 O 2 were the main active species during the photocatalytic process. The inhibition effect of NSCQDs and C 3 N 4 on BiOBr photogenerated carrier recombination was analyzed by photoluminescence and transient photocurrent tests. This study is expected to provide an attractive strategy for constructing efficient and environmentally friendly photocatalysts for environmental remediation.
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JOURNAL OF CATALYSIS
·
2024
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IF 6.5
Yuting Wang,Mengxiang Wang,Xuya Zhang,Xinru Pan,Yongpeng Cui,Daoqing Liu,Yajun Wang,Wenqing Yao
In addressing the industrial need for a simple, equipment-minimal, and non-toxic method of in-situ hydrogen peroxide (H 2 O 2 ) production, this paper presents a cost-effective, environmentally friendly photocatalyst. Our design strategy focuses on the dual-element doping of phosphorus and sodium into graphitic carbon nitride (g-C 3 N 4 ), chosen to synergistically enhance photocatalytic performance. This approach yields a notable H 2 O 2 production concentration of 3001.64 μmol·g −1 ·L -1 within 100 min, using isopropanol as a sacrificial agent, which was 61-fold increase compared to bulk g-C 3 N 4 . Density Functional Theory (DFT) calculations were performed to elucidate the alterations in the band structure of the catalyst induced by dual-element doping, which consequentially engendered an asymmetric intrinsic electric field. Additionally, oxygen’s transition state affinity due to phosphorus doping was also investigated to reveal the mechanisms of synergistic catalysis. This development contributes to meeting industrial demands for pollutant degradation via Fenton processes and presents a sustainable alternative to traditional H 2 O 2 production methods.
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JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
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2024
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IF 4.1
Lingtao Liu,Lijian Wang,Jingxin Tan,Cong Yu,Junjie Bian,Xinbo Wang
Photocatalytic selective oxidation of furfural is a green, gentle way of preparing furoic acid. Photocatalytic oxidation effectively avoids the problems of difficult separation and high energy consumption in subsequent work-ups caused by the use of homogeneous oxidants. The photocatalytic process suffers from uncontrollable reactive oxygen species, resulting in low selectivity of the target product and excessive oxidation. Therefore, the K x -C 3 N 4 /UiO-66-NH 2 -Y catalyst was prepared by the mass proportion of UiO-66-NH 2 and K x -C 3 N 4 to form a heterogeneous structure, and the band gap width was adjusted to effectively avoid the formation of non-target strong reactive oxygen species ( OH). The results showed that: the aqueous 0.1 mM Na 2 CO 3 solution had an inhibitory effect on the non– target reactive oxygen species at room temperature; when the reaction time was 5 h and K 0.1 -C 3 N 4 /UiO-66-NH 2 -20, the furoic acid had the highest yield of 70.7, the target reactive oxygen species was confirmed by free radical capture experiments as O 2 – , and it was postulated that the reaction mechanism for the preparation of furoic acid by selective oxidation of furfural.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2025
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IF 8.5
Xiaokang Jiang,Shujun Liu,Mengting Zhang,Zhaoning Xu,Zhengkun Yu,Yuying Ma,Guoliang Liu,Enlong Zhou,Hai Fan,Shuhua Zhu
Eutrophic fruits tend to deteriorate after harvest due to suffering from dehydration, microbial infection, and senescence. Therefore, the development of multifunctional preservation material is crucial to resist these alterations. In this study, well designed amino-rich porous carbon nitride (APCN) with excellent photocatalytic antimicrobial performance was first infused into the biodegradable chitosan (CS) matrix to obtain photoactive film (APCN-CS). Then the photoactive film was further casting onto the surface of poly (butylene terephthalate- co -glycol terephthalate) (PBAT) to fabricate APCN-CS/PBAT bilayer film with improved water-blocking performance. The design of the bilayer film aimed to integrate the water-blocking properties of PBAT film with the excellent photocatalytic antibacterial properties of APCN-CS film, thereby achieving synergistic advantages to prolong the shelf life of fruits. The incorporation of 5 % APCN displayed excellent photocatalytic killing performance against Escherichia coli ( E. coli ) and Staphylococcus aureus ( S. aureus ) under visible light irradiation, with the bactericidal efficiency up to 99.96 % and 99.75 %, respectively. Also, the film exhibits excellent antibacterial activity against fungi. The excellent antimicrobial performance could be attributed to the capturing effect of CS towards bacteria and production of reactive oxygen species (ROS) from APCN. Moreover, after decorating the APCN-CS film with PBAT layer, the bilayer films are tightly connected without any delamination owing to the strong hydrogen bonding interaction, presenting significant improvements in both mechanical strength and water-blocking performance. As a result, preservation experiments demonstrated that the APCN-CS/PBAT bilayer film could effectively extend the shelf life of mango. This research provides new insights for the prevention of fruit spoilage in food industry.
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