ANALYST
·
2021
·Vol. 147
·期 2
·247-251
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IF 4.616
Jun-Tao Cao,Yi-Zhuo Fu,Xiao-Long Fu,Shu-Wei Ren,Yan-Ming Liu
Herein, a novel and facile dual-wavelength ratiometric electrochemiluminescence-resonance energy transfer (ECL-RET) sensor for hydrogen sulfide (H2S) detection was constructed based on the interaction between S2− and Cd2+-doped g-C3N4 nanosheets (NSs). Cd2+-doped g-C3N4 NSs exhibited a strong ECL emission at 435 nm. In the presence of H2S, CdS was formed in situ on g-C3N4 NSs by the adsorption of S2− and Cd2+, generating another ECL emission at 515 nm. Furthermore, the overlapping of the absorption spectrum of the formed CdS and the ECL emission spectrum of g-C3N4 NSs led to a feasible RET, thus quenching the ECL intensity from g-C3N4 at 435 nm. Through an ECL decrease at 435 nm and an increase at 515 nm, a dual-wavelength ratiometric ECL-RET system for H2S was designed. The sensor exhibited a lower detection limit of 0.02 μM with a wide linear range of 0.05–100.0 μM. In addition, the applicability of the method was validated by plasma sample analysis with a linear range of 80.0–106.0%. We believe that such a proposal would provide new insight into advanced dual-wavelength ECL ratiometric assays.
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高影响因子
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
·
2023
·
IF 4
Han Yu,Faguan Hu,Hongliang Xu,Bo Song,Hailiang Wang,Mingliang Li,Gang Shao,Bingbing Fan,Hailong Wang,Hongxia Lu
g-C 3 N 4 /WO 3 heterojunction composites were synthesized via an in-situ method by thermal polymerizing the mixture of dual precursors (urea and thiourea with molar ratio of 3:1) and different amount of tungstic acid. The as-synthesized g-C 3 N 4 /WO 3 composites, with lamellar and rod-like nano-porous structure, were mainly composed of g-C 3 N 4 and monoclinic WO 3 , in which the crystal size of WO 3 was about 5–10 nm. The specific surface area of the composite increased gradually with the tungstic acid dosage and reached 79.41 m 2 /g when the addition amount of tungstic acid was 1 wt%. The in-situ construction of g-C 3 N 4 /WO 3 heterojunction contributed to the reduction of band gap, improvement of the visible response range as well as the acceleration of the separation and migration of the photogenerated carriers. As the dosage of tungstic acid increased, the photocatalytic degradation performance of g-C 3 N 4 /WO 3 composite towards tetracycline improved gradually and achieved the optimum when the addition amount of tungstic acid was 0.1 wt% (CN/WO 3 -10). CN/WO 3 -10 (0.05g) degraded 83 % of tetracycline molecules (100 mL, 20 mg/L) after photocatalysis for 100 min, whose degradation rate constant was 10.1 and 1.48 times that of pure WO 3 and g-C 3 N 4 , respectively. Moreover, g-C 3 N 4 /WO 3 composite exhibited excellent stability and reusability for the photocatalytic degrading tetracycline. This work provides a facile and practicable approach for the preparation of g-C 3 N 4 /WO 3 composite.
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高影响因子
OPTICAL MATERIALS
·
2023
·
IF 3.9
Jiamei Zhao,Qiangyi Deng,Ziyin Yang,Hongmei Zhang,Conglu Zhang
In this paper, a high-efficient visible light responsive g-C 3 N 4 /CaTiO 3 /CQDs Z-type heterojunction photocatalyst was successfully prepared by a two-step method for the photodegradation of organic pollutants in water. The combination of g-C 3 N 4 , CaTiO 3 and CQDs could produce synergistic effect, which facilitated the separation of carriers, thereby enhancing photocatalytic activity . The photocatalytic kinetic removal rate of g-C 3 N 4 /CaTiO 3 /CQDs for methylene blue could reach about 8 times of g-C 3 N 4 and 5.5 times higher than that of CaTiO 3 . The effects of co-existing ions, initial pH, water source, and humic acid on meloxicam degradation were examined. Repeatability experiments indicated that the composite had good reusability and stability with 81.1 % removal for meloxicam after four cycles. The main active substances of g-C 3 N 4 /CaTiO 3 /CQDs in free radical capture experiment was ⋅O 2 − . Possible degradation pathways of meloxicam were also analyzed. The results highlight the g-C 3 N 4 /CaTiO 3 /CQDs Z-type heterojunction is a desirable photocatalyst for removing organic pollutants in water.
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Nanomaterials
·
2023
·Vol. 14
·期 1
·74
·
IF 5.3
Xin Zhong,Meihuan Ji,Wenxin Wu,Caicai Lu,Wenping Liu,Fubin Jiang
In this work, the heterojunctions of CuInS2embedded in the g-C3N4materials (xCuInS2/g-C3N4, abbreviated as xCIS/GCN) was successfully prepared for peroxymonosulfate (PMS) activation under visible light. The catalysts are characterized by different techniques, such as XRD, FTIR, SEM, TEM, and UV-vis. The unique heterojunction composites can suppress the recombination of photogenerated pairs. The catalytic results showed that the 3CIS/GCN exhibited excellent catalytic levofloxacin (LVF) degradation efficiency, while more than 98.9% of LVF was removed in 60 min over a wide pH range. SO4•−, O2•−, OH•, and1O2were verified as the main reactive species for LVF degradation via the quenching experiments and electron paramagnetic resonance technology (EPR). The synergetic effect of xCIS/GCN, PMS, and visible light irradiation was discussed. The possible LVF degradation pathway was proposed through byproducts analysis (LC-MS). Moreover, the 3CIS/GCN/vis-PMS system has very low metal leaching. Owing to xCIS/GCN having good properties for PMS activation, it has potential applications for LVF or other hazardous pollutants degradation.Keywords:peroxymonosulfate;visible-light-assisted PMS activation;antibiotics
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高影响因子
CATALYSIS LETTERS
·
2023
·
IF 2.8
Chen Feng,Jiao Peixin,Zhao Caixian
Single-atom photocatalysts exhibit outstanding performance in energy and environmental photocatalysis, due to their exceptional capabilities in enhancing light-harvesting, charge transfer dynamics, and surface reactions. The key to preparing single-atom photocatalysts lies in developing an appropriate metal-support that can prevent aggregation or sintering during synthetic procedures. In this work, a Co(II)-urea complexe in-situ formed in melamine was employed as single-atom Co precursors to synthesize an efficient single-atom Co decorated P doped g-C 3 N 4 (Co/PCN) photocatalyst. The high-angle annular dark field transmission electron microscope (HAADF-TEM) results indicated abundant Co single atoms were immobilized in the g-C 3 N 4 matrix. Under visible-light irradiation, the as-prepared photocatalysts show remarkably enhanced photocatalytic performance. Especially, loaded with 1.5 wt% single atoms Co, the optimized Co/PCN exhibits H 2 evolution of 892.5 µmol g −1 h −1 , which is 33 times higher than that of PCN, and even twice as much as that of Pt-loaded g-C 3 N 4 (Pt/PCN). The enhanced photocatalytic activity is ascribed to the synergistic effect between single-atom Co and P doping, which facilitates efficient light harvesting, charge separation, and migration. It is believed that this study paves a new avenue for developing high-efficiency single-atom photocatalysts. Graphical Abstract
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高影响因子
Journal of Food Measurement and Characterization
·
2023
·
IF 3.4
Wei Qingyi,Dong Qirong,Pu Hongbin,Sun Da-Wen
Aquaculture fungicide causes threats to the human community and their sensitive detection are thus essential for food safety. Herein, MoS 2 /g-C 3 N 4 @Au heterojunction-based recyclable SERS substrate was developed for fungicide detection. The optimal substrate exhibited good SERS performance with a detection limit as low as 9.908 × 10 −5 mg L −1 for malachite green (MG). Furthermore, an MCN@Au-based photodegradation of crystal violet (CV) under simulated light irradiation was realized, resulting in a degradation rate of 95.6%. With the dual function of the as-synthesized materials, good reusability of the substrates for at least six “detection-degradation” cycles was achieved. In addition, the MG in prawn extract could be sensitively determined with a satisfactory recovery from 91.60 to 124.00%. This work paves an avenue for the fabrication of heterojunction-based recyclable SERS substrates and provides a novel weapon for food safety protection.
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高影响因子
Journal of Water Process Engineering
·
2023
·
IF 7
Haixia Lyu,Wenzhang Zhu,Kaixuan Chen,Jun Gao,Zenghong Xie
Three dimensions (3D) flower-shaped g-C 3 N 4 /MoS 2 composite was prepared by immobilizing molybdenum disulfide (MoS 2 ) on carbon nitride (C 3 N 4 ) with structural defects by in-situ hydrothermal assay. The morphological structure and photochemical properties of the obtained catalysts were characterized by SEM, TEM , EDS, FTIR , XRD and XPS. Using methylene blue (MB) as the target pollutant, the photocatalytic performance cyclic stability of g-C 3 N 4 /MoS 2 composite were studied under simulated sunlight. The results showed that the prepared catalyst could remove 98 % of MB within 60 min and still reached 96.4 % after 5 cycles with good stability and regeneration. Its apparent rate constant was 0.0523 min −1 , which was 11.5, 8.2 and 13.9 times higher than those of g-C 3 N 4 (0.00453 min −1 ), C 3 N 4 with structural defects (0.00635 min −1 ) and MoS 2 (0.00377 min −1 ), indicating that the synergistic effect of structural defects, heterojunctions and 3D structure has achieved efficient degradation of MB. Furthermore, the photocatalytic mechanism of g-C 3 N 4 /MoS 2 composite was proposed by combining free radical capture experiment and electron paramagnetic resonance (EPR) spectroscopy and the results showed that that ·OH and ·O 2 - played a primary role in the catalytic degradation.
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高影响因子
NEW JOURNAL OF CHEMISTRY
·
2023
·Vol. 47
·期 44
·20336-20343
·
IF 3.3
Meihui Lu,Aichen Dong,Xinyang Li,Xuanqi Liu,Ziqing Zhang,Tao Tian,Liqiang Jing
Semiconductor photocatalysis is a potential solution to meet energy needs with green and inexhaustible solar energy. However, designing efficient and stable photocatalysts is a challenging task due to the limited ability to effectively separate electrons and holes. In this paper, by using a straightforward ethanol dispersion technique, we were able to combine ultrathin layered Cu-TCPP MOFs with g-C3N4 nanosheets, resulting in the creation of an extremely effective nano-composite photocatalyst with exceptional UV-vis activity. CT/CN heterojunctions displayed remarkable photocatalytic efficacy for the production of H2, with 3CT/CN showcasing a five-fold enhancement in photoactivity as compared to the unadorned g-C3N4. Based on the results of photoluminescence spectroscopy, electrochemical impedance spectroscopy, and electrochemical reduction, the considerably improved charge transfer and separation, together with the possible catalytic capability of uniformly distributed metal nodes in Cu-TCPP, are believed to be the underlying reason for the observed exceptional photoactivity. After thorough analysis, a potential process for charge transfer and segregation between g-C3N4 and Cu-TCPP has been suggested.
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高影响因子
SEMICONDUCTOR SCIENCE AND TECHNOLOGY
·
2021
·Vol. 36
·期 4
·045025
·
IF 2.352
Xiang Yu Liu,Jin Li
Solar-driven nano-semiconductor catalysts have shown great potential in solving environmental pollution and energy issues. They convert solar energy into chemical energy, release strong oxidizing hydroxyl radicals (OH·), and thoroughly degrade organic pollutants. However, these photocatalysts in turn may also damage some organic carriers. Therefore, we have used graphite phase carbon nitride (g-C3N4) as the isolation layer to prevent the carrier polyester fiber (PET) from being oxidized by zinc oxide (ZnO). ZnO-g-C3N4@PET composite has been prepared by hydrothermal method, photoluminescence results indicated that ZnO-g-C3N4@PET has a low photo-generated charge recombination rate, while g-C3N4 improves the visible light response of the composite and exhibits an obvious photocatalytic enhancement effect. In the experiment of degrading methylene blue (MB), the degradation efficiency of ZnO-g-C3N4@PET composite has been significantly improved compared with ZnO@PET and g-C3N4@PET alone. In addition, the prepared photocatalyst also has good reusability and still maintains a high degradation rate after five cycles of tests. In the end, a possible mechanism and a pathway of photocatalytic degradation of MB were proposed. All in all, this is a feasible way to build a highly efficient, environmentally friendly and sustainable supported photocatalyst.
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高影响因子
DIAMOND AND RELATED MATERIALS
·
2021
·
IF 3.315
Cunlu Wang,Guangwei Zhang,Han Zhang,Zihao Li,Yeqian Wen
Porous graphitic carbon nitride nanosheets (PMCNS) photocatalyst with a specific surface area of 92.75 m 2 g −1 was prepared by ammonium carbonate guide structure in a one-pot strategy. Compared with bulk graphitic carbon nitride (MCN), the pores in the PMCNS formed by curling and sealing of the lamella provide more active sites, which promote charge separation and transfer, and inhibit the recombination of photoexcited electron and hole pairs. To confirm our strategy, the photocatalytic degradation of rhodamine B (RhB) and hydrogen evolution ability of PMCNS under visible light were performed, and a significant enhancement was observed, the efficiencies are 12.8 and 3.8 times that of MCN, respectively. This work provides an approach for reconstruction of graphitic carbon nitride (g-C 3 N 4 ) structure to improve the photocatalytic oxidation and reduction capabilities under visible light.
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高影响因子
APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Dong Liu,Chunling Li,Tianjun Ni,Ranpeng Gao,Jiayu Ge,Fengquan Zhang,Weidong Wu,Jinliang Li,Qian Zhao
Currently, the photo-Fenton oxidation has been increasingly studied in the domain of contaminant elimination. However, the lack of active sites and the slow charge migration in the catalytic process, still limit its practical application. 3D/0D hybrids offer a better opportunity for improving photo-Fenton activity due to their high charge mobility and increased number of catalytic sites, which is highly desirable but remains a large challenge. Herein, 3D interconnected porous g-C 3 N 4 hybridized with Fe 2 O 3 QDs (FCN) was developed and exhibited a porous structure and large specific areas. A large number of active sites and rapid charge separation/migration were achieved by the loading of ultrasmall Fe 2 O 3 QDs on the surface of g-C 3 N 4 . Moreover, the high charge mobility of this material promoted the fast conversion of Fe 3+ to Fe 2+ , resulting in the optimum synergistic effect between the photocatalytic and Fenton oxidation processes. Thus, the FCN catalysts exhibited excellent photo-Fenton oxidation activity towards the decomposition of organic contaminants (such as phenol, 2,4-dibromophenol, 2,4,6-trichlorophenol, rhodamine B and methyl orange). In addition, the roles of active species in the photo-Fenton oxidation reaction were also studied, and the results imply that the hydroxyl radicals played the most important role in the degradation of organic contaminants.
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高影响因子
APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Wen Ge,Kong Liu,Shukang Deng,Lanxian Shen,Peizhi Yang
Construction of heterostructure is an efficient approach to improve the photocatalytic performance of catalysts. Herein, the Bi 6 Fe 1.5 Co 0.5 Ti 3 O 18 (BFCTO) nanoplates are successfully loaded on g-C 3 N 4 nanosheets by a facile chemical process for the first time. The photocatalytic activity of all g-C 3 N 4 /BFCTO catalysts are measured by the degradation of Rhodamine B (RhB) under visible-light irradiation. The results display that g-C 3 N 4 /BFCTO heterojunctions exhibit greatly improved photocatalytic activity compared with corresponding bare g-C 3 N 4 and BFCTO catalysts. Based on the experimental results of photocurrent responses, EIS and ESR, it is clearly demonstrated that the improved activity is attributed to the formation of Z-scheme photocatalyst. The g-C 3 N 4 /BFCTO-2 heterojunction showed the optimal photocatalytic activity with the photodegradation efficiency of 84.9% within 20 min. We hope that the work can provide a new insight for exploring Bi n +1 Fe n −3 Ti 3 O 3 n +3 -based Z-scheme heterojunction for pollutant degradation and environment restoration.
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