APPLIED SURFACE SCIENCE
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2023
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IF 6.7
Huijie Wang,Qi Liu,Mengyang Xu,Chenlong Yan,Xianghai Song,Xin Liu,Huiqin Wang,Weiqiang Zhou,Pengwei Huo
The localized surface plasmon resonance (LSPR) effect has shown significant progress in enhancing the efficiency of light absorption and separating photogenerated carriers. Herein, the dual-plasma enhanced 2D/2D/2D g-C 3 N 4 /Pd/MoO 3-x (CPM) S-scheme heterojunction photocatalysts were synthesized using the method of hydrothermal and electrostatic self-assembly for high-selectivity photocatalytic reduction of CO 2 to produce CO. The dual LSPR effect of MoO 3-x and ultrathin Pd nanosheets synergistically broadened the optical response range of the CPM composites and successfully improved the photocatalytic activity and near-infrared (NIR) performance. The optimized CPM-30 photocatalysts exhibited CO yields of 18.55 μmol g −1 with a selectivity of 96.3%. In addition, the CO yield reached 3.92 μmol g −1 after 4 h of NIR light photoirradiation. The electron spin resonance (ESR) and ultraviolet photoelectron spectroscopy (UPS) tests showed that the S-scheme heterojunctions were constructed by coupling g-C 3 N 4 /Pd nanosheets and MoO 3-x . This work will provide a reference for improving product selectivity through the design of two-dimensional composites and the utilization of plasma materials.
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OPTICAL MATERIALS
·
2023
·
IF 3.9
Xiaoxia Ou,Pu Chen,Ke Zhao,Cunjie Xia
A novel ternary photocatalyst with a Z-scheme heterojunction was successfully synthesized through the deposition of Ag nanoparticles onto the surface of a ZnO/g-C 3 N 4 composite. The prepared photocatalysts were characterized by XRD , FT-IR, XPS , HRSEM, TEM , DRS, PL, EIS, TPC , and M-S. The photocatalytic performance of the as-synthesized photocatalysts was systematically investigated through the photodegradation of norfloxacin (NOR) and rhodamine B (RhB) under visible light irradiation. The photodegradation efficiency of 5% Ag/ZnO/g-C 3 N 4 (5AZCN) composite photocatalyst reached 86.7% (480 min) and 98.0% (60 min) for NOR and RhB, respectively. Moreover, the apparent rate constants of the 5AZCN composite photocatalysts for NOR and RhB were found to be 3.4 and 22.2 times higher than that of the ZCN composite photocatalysts, respectively. The significantly enhanced photocatalytic performance was ascribed to the widened range of visible light response and the efficient separation and migration of carriers facilitated by the introduction of Ag nanoparticles that functioned as electron transfer mediators. Based on the free radicals quenching experiment and electron spin resonance (ESR) spectroscopy characterization, superoxide radicals (·O 2 − ) were the main reactive species in the photodegradation process. Furthermore, the charge transfer process was proved to be a Z-scheme transfer mechanism. This work provides a promising approach to simply constructing novel efficient Z-scheme photocatalysts for the elimination of environmental pollutants.
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ANALYTICAL CHEMISTRY
·
2023
·
IF 7.4
Fanglei Liu,Jiayi Zhao,Xinyu Liu,Xi Zhen,Qiumei Feng,Yingqiu Gu,Guohai Yang,Lulu Qu,Jun-Jie Zhu
In this paper, a photoelectrochemical (PEC)-surface-enhanced Raman scattering (SERS) dual-mode biosensor is constructed coupled with a dual-recognition binding-induced DNA walker with a carbon nitride nanosheet (C3N4)/MXene-gold nanoparticles (C/M-Au NPs) accelerator, which is reliable and capable for sensitive and accurate detection of Staphylococcus aureus (S. aureus). Initially, a photoactive heterostructure is formed by combining C3N4 and MXene via a simple electrostatic self-assembly as they possess well-matched band-edge energy levels. Subsequently, in situ growth of gold nanoparticles on the formed surface results in better PEC performance and SERS activity, because of the synergistic effects of surface plasmon resonance and Schottky barrier. Furthermore, a three-dimensional, bipedal, and dual-recognition binding-induced DNA walker is introduced with the formation of Pb2+-dependent DNAzyme. In the presence of S. aureus, a significant quantity of intermediate DNA (I-DNA) is generated, which can open the hairpin structure of Methylene Blue-tagged hairpin DNA (H-MB) on the electrode surface, thereby enabling the switch of signals for the quantitative determination of S. aureus. The constructed PEC-SERS dual-mode biosensor that can be mutually verified under one reaction effectively addresses the problem of the low detection accuracy of traditional sensors. Experimental results revealed that the effective combination of PEC and SERS is achieved for amplification detection of S. aureus with a detection range of 5–108 CFU/mL (PEC) and 10–108 CFU/mL (SERS), and a detection of limit of 0.70 CFU/mL (PEC) and 1.35 CFU/mL (SERS), respectively. Therefore, this study offers a novel and effective dual-mode sensing strategy, which has important implications for bioanalysis and health monitoring.
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高影响因子
Journal of Physical Chemistry C
·
2021
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IF 4.126
Sha Qin,Yan Xiong,Jun Li,Haiqin Wan,Shenwen Fang,Ming Duan,Rui Li,Donghua Liao
In this work, the adsorption and photodegradation performance of dye pollutant methylene blue (MB) on the g-C3N4 surface was real-time investigated based on attenuated total reflectance induced evanescent spectroscopy (ATR-ES). By coating g-C3N4 on a silica optical fiber (SOF) surface coupled to LED, the produced ATR-ES was interacted with MB adsorbed on the g-C3N4 interface. Therefore, the measurement processes were in situ monitored and real-time evaluated according to ATR-ES change. For adsorption investigation with a red-LED, the change of “red” ATR-ES indicated the adsorption process was spontaneous. At the first stage, the fast adsorption was mainly due to electronic attraction. At the second stage, the slow adsorption was mainly due to the π–π interaction. For photodegradation investigation with a UV-LED, the change of “violet” ATR-ES indicated MB was oxidized by a hydroxyl radical (•OH) and superoxide radical (•O2–) to upset adsorption–desorption equilibrium. The surface apparent adsorption rate was 16 times as high as the apparent photodegradation rate constant, which indicated that the photodegradation process was the main rate control step of photocatalytic degradation reaction. The performances were characterized and verified by SEM measurements, zeta potential analysis, XRD analysis, FTIR investigation, and fluorescence imaging. By utilizing ATR-ES properties on the SOF surface, the adsorption-degradation interaction was continuously real-time monitored.
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Nano Research
·
2021
·Vol. 14
·期 7
·2363-2371
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IF 8.897
Lv Yan,Yue Lin,Khan Imran Mahmood,Zhou You,Cao Wenbo,Niazi Sobia,Wang Zhouping
Herein, we report the fabrication of Fe 3 O 4 @TiO 2 nanosheet/Ag/g-C 3 N 4 (Fe 3 O 4 @ns-TiO 2 /Ag/g-C 3 N 4 ) composite photocatalysts with well-designed hierarchical yolk-shell structure. To endow the composites with fascinating features, multiple functional components are perfectly integrated into the definite structure. The photodegradation experiments of organic pollutants revealed a significant enhancement in photocatalytic activity of developed composites as compared to P25, which is mainly due to the synergetic interaction of the tailored three-dimensional (3D) yolk-shell porous nanostructure, extended sunlight response range, and retarded the recombination probability of photogenerated electrons-holes. More importantly, the hybrid samples exhibited superior magnetic properties due to the magnetic component. The excellent magnetic recyclability and reusability of the photocatalysts are verified by the magnetic hysteresis loop and cyclic photocatalytic degradation experiments, which is significant for the green and sustainable applications of photocatalysts. Considering its remarkable photocatalytic performance and expectant magnetic recyclability, the composite photocatalysts are expected to be a promising candidate to dispose of future environmental issues.
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ACS Applied Materials & Interfaces
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2021
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IF 9.229
Yanyan Wang,Xian Zhang,Xin Ding,Ya Li,Bin Wu,Ping Zhang,Xiaoliang Zeng,Qian Zhang,Yuhang Du,Yi Gong,Kang Zheng,Xingyou Tian
Driven by the evolution of electronic packaging technology for high-dense integration of high-power, high-frequency, and multi-function devices in modern electronics, thermal management materials have become a crucial component for guaranteeing the stable and reliable operation of devices. Because of its admirable in-plane thermal conductivity, graphene is considered as a desired thermal conductor. However, the promise of graphene films has been greatly weakened as the existence of grain boundaries lead to a high extent of phonon scattering. Here, a stitching strategy is adopted to fabricate an rGO/g-C3N4 film, where 2D g-C3N4 works as a linker to covalently connect adjacent rGO sheets for expanding the size of graphene and forming an in-plane rGO/g-C3N4 heterostructure. The in-plane thermal conductivity of the rGO/g-C3N4 film reaches 41.2 W m–1 K–1 at a g-C3N4 content of only 1 wt %, which increased by 17.3% compared to pristine rGO. The interfaced thermal resistance between rGO and g-C3N4 is further examined by non-equilibrium molecular dynamics simulations. Furthermore, owing to the unique light absorption and welding ability of g-C3N4, the rGO/g-C3N4 film presents superior solar-thermal and electric-thermal responses to controllably regulate the chip temperature against overcooling. This work provides a facile approach to construct a large-sized rGO sheet and combines heat dissipation and heating capability in the same thermal management material for future electronics.
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FOOD CHEMISTRY
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2021
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IF 7.514
Zhijun Liu,Li Wang,Pengfei Liu,Kairen Zhao,Shuying Ye,Guoxi Liang
Hydrogen peroxide (H 2 O 2 ) is usually used as a fungicide in food, it is carcinogenic, accelerates aging or inducing toxic effects such as cardiovascular disease. Herein, to meet the demand for effective and fast detection of H 2 O 2 in food, a novel non-enzymatic electrochemiluminescence (ECL) sensor based on single-stranded DNA (ssDNA)/g-C 3 N 4 nanosheets (NS) was established. The ssDNA/g-C 3 N 4 NS hybrid was prepared by simple mixing g-C 3 N 4 NS and ssDNA solution together. The prepared ssDNA/g-C 3 N 4 NS exhibited improved peroxidase-like activity and was modified on a glassy carbon electrode to catalyze the ECL reaction of luminol-H 2 O 2 to amplify the luminescence signal. Under the optimized conditions, the proposed sensor exhibits high sensitivity with a limit of detection (LOD) as low as 33 aM H 2 O 2 , which is much lower than the vast majority of reported methods. This method enables the reliable responding to H 2 O 2 from the milk samples within 1 min.
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CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Zhou Zhou,Dongyun Chen,Najun Li,Qingfeng Xu,Hua Li,Jinghui He,Jianmei Lu
In order to fix the photocatalyst and enhance the efficiency of NO degradation, a three-dimensional (3D) g-C 3 N 4 /NH 2 -UiO-66-rGO (CN/NU6-rGO) aerogel was devised and fabricated via solvothermal reaction and boiling-water bath. Herein, a type-II heterojunction was formed at CN/NU6 composite, and then, the composite was coupled with rGO. The resulting material significantly enhanced the nitric oxide (NO, 600 ppb) removal efficiency under visible-light irradiation. Optimizing the content of CN and rGO to a suitable mass ratio can increase the removal efficiency by 65.4%, which is 2.34 times that of pure NU6. This result is attributed to the construction of type-II heterojunction and the charge transport properties of rGO. The involvement of rGO not only provided extra pathways for charge transfer to prevent electron–hole pairs from recombining, but also fixed the catalyst. Moreover, the hybrid aerogel excellently reduced the harmful by-product NO 2 . Cycling experiments, along with transient photocurrent response measurements, verified that CN/NU6-rGO had excellent potential for recyclable and sustainable. This work might shed light on the construction of suitable photocatalytic systems with significant improvement of NO removal and convenient storage of catalyst.
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JOURNAL OF MOLECULAR LIQUIDS
·
2021
·
IF 6.165
Yi Huang,Gen Zhu,Kun Zou,Fei Tian,Thakur Prasad Yadav,Hui Xu,Guohai Yang,Haitao Li,Lulu Qu
Membrane fouling has been a major challenge in the practical application of membrane technology for wastewater treatment and purification. In this study, a reusable membrane composed of g-C 3 N 4 @TiO 2 -nanowires modified graphene oxide (GO/CN@TNWs) was successfully fabricated through electrostatic interactions and a vacuum filtration-assisted self-assembly process. The as-fabricated membrane possessed higher photocatalytic activity than the pure TNWs under simulated solar light exposure, attributing to the introduction of GO with high absorption and carrier mobility, and the synergistic effects of TNWs and CN. Furthermore, the π-π stacking interactions between GO and organic pollutant molecules contribute to the excellent enrichment efficiency of GO/CN@TNWs membrane (98.77%) toward tetracycline hydrochloride (TCH). Room-temperature ESR studies indicate that the GO/CN@TNWs membrane can generate more superoxide radical, hydroxyl radical and hole species for photocatalytic degradation. Therefore, the GO/CN@TNWs membrane may be used for TCH removal from waste water and the excellent solar-light-driven photocatalytic performance endows GO/CN@TNWs membrane absorbents with recycling abilities for the realization of large-scale wastewater purification.
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ACS Applied Energy Materials
·
2021
·
IF 6.024
Fang Feng,Hongfeng Hua,Lutao Li,Rongxi Xu,Jiayu Tang,Dejiang Dong,Jian Zhang,Xing’ao Li
Recently, two-dimensional (2D) g-C3N4 has attracted great interest for visible-light-driven H2 production. Thinning, doping, and reticulation have been demonstrated as effective strategies to improve the efficiency of photocatalysis, but are a challenge for structural stability. Herein, a targeted method was implemented by embedding the one-dimensional (1D) WO3 nanotubes matrix into the frameworks of 2D porous g-C3N4 to form a porous P-doped g-C3N4 nanosheets/WO3 nanotubes (PCNS/WNT) by a flexible electrostatic self-assembly process. As a visible-light-sensitive photocatalyst, the as-prepared hybrids exhibited impressive performance for hydrogen generation, which was attributed to the advantages of synergetic mechanism owing to a higher specific surface area, more reaction active sites, enhanced light absorption, and a better photogenerated carrier separation. Interestingly, the insertion of 1D WO3 nanotubes not only accelerates electrons transfer along the 1D channel but also provides robust support for 2D porous g-C3N4 architecture. As a result, the maximum photocatalytic H2 evolution rate of PCNW-50 is 547 μmol g–1 h–1, which is about four times higher than that of pure PCNS, and there is no significant reduction of H2 production after five cycles. Moreover, this 2D/1D PCNS/WNT hybrid was first reported in the area of photocatalytic hydrogen evolution and provides ideas for designing novel stable architecture of photocatalyst.
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APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Yingying Jiao,Yike Li,Jianshe Wang,Zhanhang He,Zhongjun Li
Photocatalyst with double Z-scheme mechanism can promote the separation and transmission of photo-induced carriers effectively. In this work, a novel C 3 N 4 nanotube (CNT)/N-doped carbon dots (NCDs)/Ni 2 P composite photocatalyst was prepared by decorating NCDs and Ni 2 P nanoparticles on CNT, respectively. A variety of test results, including photoluminescence spectra (PL), electrochemical impedance spectrum (EIS) and transient photocurrent responses (TPR), show that compared with CNT and CNT/Ni 2 P, CNT/NCDs/Ni 2 P composite can dramatically facilitate the separation and transmission of charge. Impressively, the CNT/NCDs/Ni 2 P composite achieves a hydrogen evolution rate of 627.2 µmol g -1 h −1 which is well above that of CNT and CNT/Ni 2 P, respectively (no detection and 48.5 μmol g -1 h −1 ). Combining the above characterization results with energy band calculation, we speculate that the remarkably optimized photocatalytic activity was predominantly ascribed to the double Z-scheme charge transfer mechanism for CNT/NCDs/Ni 2 P nanocomposite. This work provides a new member for family of photocatalysts with double Z-scheme mechanism, which is beneficial to further fundamental and applied research.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2020
·
IF 5.774
Xiao Zhang,Bin Ren,Xi Li,Yanhua Xu,Biming Liu,Peng Yu,Yongjun Sun,Danhua Mei
In this study, graphitic carbon nitride (g-C 3 N 4 ) (CN) was conveniently and environmentally modified into a stable and easily recyclable photocatalyst for the high removal efficiency of dye contaminants in water. Magnetic carrier (CN/Fe 3 O 4 ) and heterojunction photocatalysts (Ag@AgBr/CN/Fe 3 O 4 ) were prepared by ultrasonic and in situ deposition of Fe 3 O 4 and Ag@AgBr nanoparticles on the CN , respectively, and characterized by the surface structure, optical, and electrochemical properties. The effects of different catalysts, silver loading, catalyst dosage, and different aeration conditions on the photocatalytic degradation of RhB were investigated. Results exhibited that the removal rate of RhB by Ag@AgBr/CN/Fe 3 O 4 reached 96% within 150 min when the Ag loading was 5%, the catalyst dosage was 0.4 g/L, and the aeration was air. Furthermore, the degradation rate constant was 17.3 × 10 −3 min −1 , which was 4.3 and 3.4 times higher than that of CN and CN/Fe 3 O 4 , respectively. The stability study demonstrated that Ag@AgBr/CN/Fe 3 O 4 had almost no risk of Ag and Fe leakage and showed high stability. Mechanism study indicated that the construction of Z-scheme heterojunction between Ag@AgBr and CN and trapping electron by Fe 3+ promoted charge transfer and electron–hole pair separation, thus enhancing photocatalytic activity.
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