CHEMICAL PHYSICS LETTERS
·
2021
·
IF 2.328
Wen li Zhao,Yan hua Gao,Dongfeng Zhang
In this paper, spherical g-C 3 N 4 modified by N defect and O doping was prepared by a simple hydrothermal method , and combined with CdS to form a direct Z-type heterojunction . Combined with a series of characterizations (XRD, SEM, BET, FTIR and UV–vis DRS), the results show that the addition of CTAB brings a lot of positive charges on the surface of N-OCN. According to the principle of electrostatic attraction, positively charged N-OCN negatively charged CdS attract each other, which strengthens the close contact between CdS and N-OCN and plays an important role in stabilizing the formation of heterojunction. CdS is anchored to N-OCN through electrostatic interaction. Under the irradiation of visible light, the electrons on CB on positively charged N-OCN combine with holes on negatively charged CdS valence band, which improves the redox ability in photocatalytic reaction system. Taking methyl orange (MO) as a pollutant degradation model, the possible degradation mechanism was discussed in detail. This study provides a simple, effective and wide application method for the modification of g-C 3 N 4 .
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DOI
高影响因子
Talanta Open
·
2021
·
IF 0
Yuwen Pu,Yalin Wu,Zhihui Yu,Liping Lu,Xiayan Wang
The high adsorption capacity of Fe 3 O 4 and C 3 N 4 for heavy metals and the amalgam effect of Bi 2 O 3 were exploited using a Fe 3 O 4 /Bi 2 O 3 /C 3 N 4 -modified glassy carbon electrode (GCE) for the determination of Cd 2+ and Pb 2+ . The electrochemical response performance of the Fe 3 O 4 /Bi 2 O 3 /C 3 N 4 /GCE was studied by square-wave anodic stripping voltammetry. The electrochemical conditions were optimized, including the pH of the buffer solution, content of Fe 3 O 4 /Bi 2 O 3 /C 3 N 4 on the electrode surface, deposition potential and deposition time. Under optimum conditions, the Fe 3 O 4 /Bi 2 O 3 /C 3 N 4 /GCE sensor shows a linear response from 0.01 μmol/L to 3 μmol/L. The minimum detectable quantity for Cd 2+ and Pb 2+ are 3 × 10 −9 mol/L and 1 × 10 −9 mol/L, respectively. Interference studies were carried out. The sensitivity of the Fe 3 O 4 /Bi 2 O 3 /C 3 N 4 /GCE sensor to Cd 2+ and Pb 2+ does not significantly change in the presence of coexisting heavy metal ions. The Fe 3 O 4 /Bi 2 O 3 /C 3 N 4 /GCE sensor exhibits good stability and repeatability. The Fe 3 O 4 /Bi 2 O 3 /C 3 N 4 /GCE sensor was used to detect Cd 2+ and Pb 2+ in river water samples to demonstrate its real-world application.
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DOI
Solar RRL
·
2020
·Vol. 5
·期 3
·2000720
·
IF 7.527
Lian Wang,Lin Fu,Bo Li,Hui Li,Lu Pan,Bohong Chang,Longwei Yin
Despite the conspicuous achievements in perovskite solar cells (PSCs), further improvement of the power conversion efficiency (PCE) is hindered by substantially detrimental carrier recombination resulting from the high interfacial charge defect density and inferior charge transport kinetics. Herein, an interface engineering strategy is developed to introduce a Lewis base thiophene or thiazole–modified C 3 N 4 layer at the electron transfer layer (ETL)/perovskite interface to constitute a stepwise energy band alignment and passivate defects at interfaces of the perovskite film. Attributed to its well-matched energy level with TiO 2 and perovskite, the charge extraction efficiency and charge transfer dynamics can be promoted remarkably, greatly inhibiting charge recombination at the interface. Furthermore, thiophene and thiazole can donate the lone pair electrons in S or N atoms to undercoordinated Pb 2+ , which effectively passivates the electronic trap states caused by halogen vacancies, thereby greatly minimizing trap-assisted nonradiative recombination in the PSCs. Eventually, the thiazole–C 3 N 4 /perovskite-based devices acquire an outstanding efficiency of 19.23%, supported by an enhanced open-circuit voltage ( V OC ) of 1.11 V with improved moisture stability. This work provides an avenue for interfacial energy level modulation and defect passivation strategies for a rational interface microstructure design for meliorating the performance of PSCs.
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高影响因子
DIAMOND AND RELATED MATERIALS
·
2021
·
IF 3.315
Yanhua Gao,Wenli Zhao,Dongfeng Zhang
In this paper, the growth mechanism of prismatic carbon nitride at different temperatures was studied by using the mixed solution of CTAB and NaOH by thermal polycondensation-hydrothermal method, and a series of characterization methods were used to analyze and verify. The pollutant model MO solution was degraded and its photocatalytic activity was investigated under light. The results show that at a relatively low temperature, g-C 3 N 4 is a rod-like structure, and NaOH plays a major role. With the increase of temperature, CTAB plays a major role and can transport the primitives to form a rod, but also forms an ordered hydrophobic film on the crystal plane, which inhibits the growth of the rod-like structure on the (100) crystal plane and controls the extension on the (002) crystal plane. Its degradation rate is about 2.64 times that of pure g-C 3 N 4 . This significantly improves the separation rate of photogenerated electrons and the photocatalytic degradation efficiency.
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高影响因子
JOURNAL OF POLYMER RESEARCH
·
2023
·Vol. 30
·期 10
·1-13
·
IF 2.8
Li Heng,Chen Limiao,Li Zhongbei,Wang Wengui,Liu Ying,Huang Xuemei,Liu Yaochi
The combination of nitrogen and phosphorus compounds has synergistic flame retardant effect, but the addition of low phosphorus content compounds is large, which affects the mechanical properties of polymers. Phosphorus ammonium polyphosphate (APP) with high phosphorus content and graphitic carbon nitride (g-C 3 N 4 ) doped with SiO 2 were used for the flame retardant (CN-Si-APP) of polyamide 6 (PA6). CN-Si-APPs with different APP/CN mass ratio (1, 2.5 and 4) and dosage (7 and 12 wt%) were blended with PA6 via a twin-screw extruder, and their flame retardancy was investigated by limiting oxygen index (LOI), UL-94 test, muffle furnace carbonization test and raman spectroscopy. When only APP added, the coefficient of water absorption (CWA) of composites increased and its tensile strength greatly reduced by nearly 37.1% to 35.39 MPa. The addition of g-C 3 N 4 inhibited the water absorption. When the addition dosage is 7%, the CWA of PA6/APP, PA6/CN-Si-APP2.5, PA6 and PA6/CN were 11.1, 6.86, 5.78 and 4.6%, respectively. SiO 2 effectively improved the dispersion of g-C 3 N 4 and the mechanical properties of composites. Thermogravimetric analysis (TGA) showed that the char residue of PA6 composites was improved significantly. The composite with 7 wt% CN-Si-APP4 passed the UL-94 V-0 rating. The LOI value and graphitization degree (I D /I G ) of PA6/12 wt% CN-Si-APP2.5 reached 28.7% and 2.93 respectively. Under the same dosage, the graphitization degree of CN-Si-APP2.5 (3.51) was higher than that of g-C 3 N 4 (3.98). The barrier protection of g-C 3 N 4 , catalytic effect of APP and SiO 2 crosslinking network promoted PA6 to form a dense and stable char layer, which protected PA6 composites from the flame. The strategy of synergistic flame retardant in this paper provides a valuable solution for reducing the amount of flame retardant.
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高影响因子
APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Xiaochun Zheng,Shoutian Ren,Qixiao Gai,Wenjun Liu,Quanli Dong
Serious interface carrier recombination leads to moderated photocatalytic performance of carbon nitride (C 3 N 4 ), and the realization of their strongly covalent bonding with co-catalysts can efficiently inhibit this. In this article, C 3 N 4 nanosheets are first functionalized with L-cysteine molecules to form C-SH bonds, and then the photodeposited CoP x NPs are covalently bonded with C 3 N 4 with L-cysteine molecules as bridging ligands, which can efficiently reduce the C 3 N 4 /CoP x interface impedance. Their optimal hydrogen evolution rate and apparent quantum efficiency at 420 nm are 4.12 mmolg −1 h −1 and 3.74%, respectively, which are 17.2 and 13.9 times that C 3 N 4 /CoP x reference without L-cysteine bridging ligands, mainly due to the reduced C 3 N 4 /CoP x interface impedance. This work proposes a general solution to inhibit interface carrier recombination in nanocomposites by introduction of bridging ligands.
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高影响因子
Desalination and Water Treatment
·
2024
·
IF 1
Zijun Zhong,Ruopeng Xu,Huijuan He,Qiuna Zhuang,Langhuan Huang
ABSTRACT A novel g-C 3 N 4 /MoS 2 heterojunction photocatalyst with high efficient visible-light-region was fabricated by a facile calcination method. The composite with various weight ratios of g-C 3 N 4 and MoS 2 was synthesized and characterized. The results showed that MoS 2 was uniformly distributed on the surface of g-C 3 N 4 , resulting in the formation of heterostructure. The photocatalyst showed excellent photocatalytic activity in the photodegradation of organic pollutants. The optimized g-C 3 N 4 /MoS 2 sample (10-CNM) exhibited 94% (Methylene Blue) degradation efficiency after being irradiated for 2 h under visible light. At last, the possible mechanism of the enhanced photocatalytic activity was discussed.
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高影响因子
JOURNAL OF NANOPARTICLE RESEARCH
·
2014
·Vol. 16
·期 8
·1-8
·
IF 2.278
Ren Yanlin,Zhao Qidong,Li Xinyong,Xiong Wei,Tade Moses,Liu Lihong
A novel visible-light-activated photocatalyst consisting of porous graphitic C 3 N 4 nanosheets and Ag 3 PO 4 nanoparticles were synthesized through a tunable in situ deposition method. The morphology and microstructure of the C 3 N 4 /Ag 3 PO 4 nanocomposites were carefully characterized by scanning electron microscope, TEM, X-ray diffraction (XRD), energy-dispersive X-ray analysis (EDX), X-ray photoelectron spectra, and so on. The porous C 3 N 4 /Ag 3 PO 4 nanocomposites were featured by the typical platelet-like morphology, with an average crystallite size of about 39 nm. The coexistence of porous graphitic C 3 N 4 nanosheets and Ag 3 PO 4 nanoparticles is confirmed via the XRD and EDX results. Owing to its narrower band gap of Ag 3 PO 4 , the nanocomposites displayed a significant redshift of UV–Vis spectral absorption edge together with expanded light absorption in comparison with g-C 3 N 4 nanosheets. The photocatalytic activity of the prepared C 3 N 4 /Ag 3 PO 4 nanocomposites is demonstrated by the photodegradation of 4-chlorophenol (4-CP). The C 3 N 4 /Ag 3 PO 4 nanocomposites displayed higher photocatalytic activity than pure C 3 N 4 or Ag 3 PO 4 , which could be attributed to the interfacial effect of the nanocomposites in inhibiting the unfavorable recombination of photogenerated electrons and holes. Electron spin resonance spin-trap study implied that the generation of hydroxyl radicals plays the key role in the photodegradation of 4-CP by the C 3 N 4 /Ag 3 PO 4 nanocomposites under visible light irradiation.
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DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2024
·
IF 4.9
Rui Liu,Xin Zhang,Tianheng Wu,Rijia Liu,Wenyu Cui,Yuan Sun,Binqiao Ren
Developing efficient and sensitive techniques for detecting ofloxacin (OFL) residues is crucial for ensuring food safety and environmental protection. In this study, the electropolymerization method was utilized with polypyrrole (Ppy) as the functional monomer and OFL as the template to produce a molecularly imprinted composite material comprising silver (Ag) and graphitic carbon nitride (g-C 3 N 4 ) (MIP-Ag/g-C 3 N 4 /GCE) for the electrochemical detection of OFL. The electrochemical characterization was conducted using cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). Under the optimal conditions, the prepared sensor demonstrated decent sensitivity and selectivity using the differential pulse voltammetry (DPV) technique. The sensor demonstrated an optimal linear range of 10 −13 to 10 −11 mol L −1 , with a low limit of detection (LOD) of 8.842×10 −14 mol L −1 and a limit of quantification (LOQ) of 2.947×10 −13 mol L −1 , which can successfully detect OFL in milk and honey samples, showing a recovery range of 97.38–104.00 %, and 99.45–102.00 %, with relative standard deviations (RSD) below 2.82 % and 2.16 % (n=5), respectively. The sensor exhibited high selectivity, high stability, and decent reproducibility in OFL determination. This study offers valuable insights into the application of semiconductor-based electrochemical sensors, opening new possibilities for the field and contributing to the improvement of food safety and environmental protection.
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高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2018
·Vol. 25
·期 32
·32466-32477
·
IF 2.8
Cui Peipei,Hu Yun,Zheng Mengmeng,Wei Chaohai
Graphitic-like carbon nitride (g-C 3 N 4 ) photocatalyst was synthesized by a facile chemical pyrolysis method, which was built on the self-condensation of different precursors to generate g-C 3 N 4 , e.g., melamine, urea, and thiocarbamide. And the different precursors produced a great influence on the photocatalytic activities of g-C 3 N 4 . Heterojunctions of g-C 3 N 4 and BiVO 4 were synthesized using a facile solvent evaporation method. The formation of BiVO 4 /g-C 3 N 4 composites were confirmed by XRD, FT-IR, SEM, XPS, and UV-Vis DRS. The photocatalytic activities for RhB degradation were evaluated under visible-light irradiation. The photocatalytic activity of g-C 3 N 4 prepared by urea was higher than that of g-C 3 N 4 prepared by melamine and thiocarbamide, which was attributed to its favorable dispersibility, larger specific surface area, and higher oxidation capacity. The heterojunction composites exhibited higher photocatalytic activity than pure g-C 3 N 4 or BiVO 4 . The results showed obvious removal efficiency for RhB, and the optimal sample with a BiVO 4 content of 10% exhibited higher efficiency than pure g-C 3 N 4 and BiVO 4 , and 10 wt%BiVO 4 /CN-U showed the highest photocatalytic activity. The enhanced photocatalytic activity of BiVO 4 /g-C 3 N 4 composite can be attributed to the intimate coupling between the two host substrates, resulting in an efficient charge separation.
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高影响因子
JOURNAL OF APPLIED PHYSICS
·
2022
·Vol. 132
·期 18
·
IF 2.877
Zheng Xiaochun,Ren Shoutian,Gai Qixiao,Wang Yidi,Liu Wenjun
Various defects of nanocomposites inevitably bring some harmful effects on their photoelectric performance, especially considering that interface defects seriously hinder the carrier interfacial transfer. Here, the interface optimization can be realized between graphitic carbon nitride (C 3 N 4 ) and CoP co-catalyst by the introduction of good conductive carbon nanosheets (CNs). As a result, the defect density of synthesized C 3 N 4 /CNs/CoP is reduced to 1.40 × 10 12 cm −3 from 2.55 × 10 12 cm −3 of C 3 N 4 /CoP, and its interface impedance is correspondingly reduced to 34% of that of C 3 N 4 /CoP. Therefore, the optimal H 2 evolution rate of 5.26 mmol g −1 h −1 and apparent quantum efficiency of 9.27% at 420 nm are realized, which are 4.8 and 8.1 times that of C 3 N 4 /CoP photocatalyst in the absence of CNs, respectively. This work provides a general solution to reduce defect density and carrier transfer resistance in nanocomposites by the introduction of a highly conductive buffer layer.
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高影响因子
MICROCHEMICAL JOURNAL
·
2019
·
IF 3.206
Li Zhao,Wei Lv,Juying Hou,Yijing Li,Junling Duan,Shiyun Ai
We synthesized magnetically recyclable g-C 3 N 4 /Fe 3 O 4 /ZIF-8 nanocomposites as an emerging adsorbent for the malachite green (MG) removal in aqueous solution. Bath absorption experiments for MG were done to explore the influence (pH, adsorbent dosage and initial concentration) on its absorption process. The adsorption isotherm and kinetics followed Langmuir model and pseudo-second-order kinetic model, respectively. The thermodynamic datas (ΔG ○ < 0, ΔH ○ > 0, ΔS ○ > 0) showed that the adsorption process for MG was feasible, endothermic and spontaneous. The g-C 3 N 4 /Fe 3 O 4 /ZIF-8 nanocomposites showed excellent removal properties for MG. The maximum equilibrium adsorption capacity could reach as high as 3412 mg/g. The g-C 3 N 4 /Fe 3 O 4 /ZIF-8 nanocomposites could be easily separated using an external magnet, and the nanocomposites could be repeatedly utilized after five cycles. The ultra-high adsorption capacity, easy separation, and excellent recyclability enabled the obtained g-C 3 N 4 /Fe 3 O 4 /ZIF-8 nanocomposites a good adsorbent for the adsorption of MG.
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高影响因子
危险品化学品经营许可证（带存储）