JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2020
·
IF 7.489
Sheng Zhao,Jing Xu,Min Mao,Lingjiao Li,Xuanhao Li
A dye-sensitive photocatalytic H 2 evolution reaction (HER) system with photogenerated carrier directed conduction was constructed. The protonated g-C 3 N 4 combines with the sheet-like Co MOF to form a 2D/2D heterojunction via electrostatic self-assembly. The protonated g-C 3 N 4 and 2D Co-MOF directionally adsorb Eosin Y (EY) and triethanolamine (TEOA) molecules through hydrogen bond and complexation to achieve a whole photocatalytic system. The integral structure effectively facilitates the utilization of dye sensitizer and hole sacrificial agent to achieve the effective and stable photocatalytic H 2 evolution capacity. The photocatalytic hydrogen evolution rate of g-C 3 N 4 after protonation is 1.88 times as high as that of the original g-C 3 N 4 . On the basis of 2D/2D heterojunction, Co MOF is doped with rare earth element Sm. The 4f electrons and the difference valences (Sm 3+ and Co 2+ ) further suppress the reorganization of photogenerated excitons to achieve highly efficient photocatalytic HER. The directional coupling of sensitizer and electron sacrificial agent combined with rare earth element doping makes the photocatalytic HER rate of the composite material reached 73.42 μmol . h −1 within 5 h under simulated sunlight.
研究领域:
材料科学
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光化学
·
能源科学
✓ 已验证
DOI
高影响因子
ADVANCED SYNTHESIS & CATALYSIS
·
2016
·Vol. 358
·期 16
·2631-2641
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IF 6.453
Lingling Wang,Min Yu,Chaolong Wu,Nan Deng,Chao Wang,Xiaoquan Yao
In this contribution, an Ag/g-C 3 N 4 nanocomposite was synthesized and utilized as highly efficient and green photocatalyst for organic reactions under visible light irradiation. A layered, porous g-C 3 N 4 was synthesized following a modified solvothermal-roasting process by using melamine and cyanuric chloride as precursor. Silver nanoparticles (NPs) were well anchored on g-C 3 N 4 nanosheets, which were prepared by a facile impregnation–roasting method. The inexpensive, stable g-C 3 N 4 coupled with the localized surface plasmon resonance (LSPR) effect of Ag NPs exhibited high photocatalytic activities toward aerobic oxidative amidation of aromatic aldehydes under visible light irradiation. Good to excellent yields were achieved for various substrates under the light of a 25 W compact fluorescent light (CFL) bulb in air. The operationally easy procedure provides an economical, green, and mild alternative for the formation of amide bonds.
研究领域:
材料科学
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有机化学
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2020
·
IF 5.774
Haochuan Jing,Ruipeng Ou,Hongbin Yu,Yahui Zhao,Ying Lu,Mingxin Huo,Hongliang Huo,Xianze Wang
The emergence of antibiotics in surrounding environment has aroused serious concerns. In this work, a direct Z-scheme heterojunction was constructed by integrating g-C 3 N 4 nanoparticles (g-C 3 N 4 NP) with WO 3 hollow microsphere composed of nanosheets (WO 3 NHMs) and developed as highly efficient photocatalyst for tetracycline hydrochloride (TC) removal. The hierarchical structure of WO 3 NHMs not only enhanced the optical absorption of catalyst by multiple reflecting and scattering of photons, but also promoted the adsorption of reactant molecules owing to the high surface area generated from the self-assembly interconnected nanosheets. The close contact between the interfaces of g-C 3 N 4 NP and WO 3 NHMs led to effective charge separation and transfer, and the optimized Z-scheme architecture preserved the oxidation and reduction capacity of each component to the greatest extent. After optimizing the component ratio, the corresponding g-C 3 N 4 NP/WO 3 NHMs hybrid delivered a significantly prominent photocatalysis towards TC degradation, whose kinetic constant was 2.42 times as high as that of bulk g-C 3 N 4 , and 6.88 folds as great as that of pristine WO 3 NHMs. As far as we know, this is the first report of integrating C 3 N 4 NP with WO 3 NHMs to enhance TC photodegradation through the synergistic effect of light absorption, quantum efficiency and adjusted surface characteristics. The active species capture experiments testified that h + and OH originated from the reaction of electrons with oxygen played important roles in the photocatalytic process. Under the attack of reactive oxygen species, TC underwent demethylation, deacylation, and ring-opening processes, and ultimately mineralized into CO 2 and H 2 O. This research can open up a new way to develop photocatalysts with high TC removal efficiency through reasonable structural configuration.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
ENERGY & FUELS
·
2020
·
IF 3.421
Menglong Sun,Qian Wang,Baiying Dai,Weihua Sun,Yaru Ni,Chunhua Lu,Jiahui Kou
A simple combination of thermal etching and liquid-phase ultrasonic stripping was deployed to prepare high-performance graphite carbon nitride (g-C3N4) nanosheets. Also, graphene oxide with plentiful active groups was used to combine g-C3N4 with a magnetically actuated artificial cilia array (MAACA) to generate a composite cilia array, which can ensure the facile recovery of g-C3N4. This strategy addresses the limitations of an adjustable band gap for easy response to visible light and circumvents the encumbered limitation of recyclability, thus addressing a chronic environmental problem by curbing waste. The underlying functional principle of the array used was analyzed and studied in greater detail. The photocatalytic hydrogen production efficiency of MAACA with 0.4 mg of g-C3N4 at a magnetic field driving frequency of 12.50 Hz was found to be ∼75.0% higher than that at a magnetic field driving frequency of 0 Hz.
研究领域:
材料科学
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环境科学
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能源科学
✓ 已验证
DOI
高影响因子
OPTICAL MATERIALS
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2022
·
IF 3.754
Zhengdong Zhang,Xingyu Chen,Shanhua Chen,Qi Dong,Xinyi Zhang,Ao Jiang,Dafu Zhang,Yuli Di,Taishan Li
A Z-scheme TiO 2 /g-C 3 N 4 heterostructure system was used to activate peroxymonosulfate (PMS) for the photocatalytic degradation of Rhodamine B (RhB). The Z-scheme TiO 2 /g-C 3 N 4 heterojunction photocatalysts were successfully synthesized by using a simple impregnation method. The structure and surface morphology of the samples were characterized by X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FT-IR), X-Ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The optical and electrochemical properties were characterized by UV–vis diffuse reflectance spectroscopy (DRS), photoluminescence (PL) electrochemical impedance spectroscopy (EIS).The results indicated that the Z-scheme heterojunction between TiO 2 and g-C 3 N 4 was successful established and the optimal photocatalytic activity was achieved when the mass ratio of TiO 2 to g-C 3 N 4 is 10:1. The degradation rate of RhB (20 mg/L, 50 mL) was 82.79% within 120 min simulated sunlight irradiation. After adding PMS to 10% TiO 2 /g-C 3 N 4 heterojunction photocatalysts , the reaction rate constant (k) of the TiO 2 /g-C 3 N 4 -PMS system is about 11.39 times as large as that with 10% TiO 2 /g-C 3 N 4 system. Moreover, the free radical trapping experiments results demonstrated that h + and SO 4 − · were the main active species in the TiO 2 /g-C 3 N 4 -PMS system.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Zihan Yang,Jingkai Yang,Lixia Li,Wanning Cao,Jiao Zhang,Hongli Zhao,Liqin Wang
The challenge of creating effective S-scheme visible-light photocatalysts persists due to the inactive visible-light-driven component and the low band-gap characteristics of semiconductors. In this work, we developed a novel F-BiVO 4 /g-C 3 N 4 /CdS dual S-scheme photocatalyst using a sonochemical method. The removal efficiency of Cr(VI) and ciprofloxacin (CIP) can reach 98 % and 90 % in 5 min and 30 min, respectively, under simulated solar illumination. The excellent photocatalytic activity can be attributed to the efficient carrier separation and transport with the help of internal electric field at the interface. This work also reveals the reduction process of Cr(VI), as well as the intermediates and pathways involved in the CIP degradation, taking into account practical situations and expanding its potential applications. This research presents promising prospects for the design of bismuth-based dual S-scheme heterojunctions in the field of environmental remediation.
研究领域:
环境科学
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材料科学
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2017
·
IF 3.387
Liang-pei Hou,Rong-xiang Zhao,Xiu-ping Li,Xiao-han Gao
A series of catalysts of composition X -MoO 2 /g-C 3 N 4 ( X = 0, 0.5, 1, 3, 5 wt.%) were successfully synthesized by calcination of a mixture of (NH 4 ) 6 Mo 7 O 24 ·4H 2 O and g-C 3 N 4 . Oxidative desulfurization experiments were conducted using X -MoO 2 /g-C 3 N 4 as a catalyst, H 2 O 2 as an oxidant, and ionic liquids (ILs) as extraction agents. Catalysts were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Fourier-transform infrared (FT-IR), scanning electron microscopy-energy dispersive X-ray spectroscopy (SEM-EDS), and Brunauer-Emmett-Teller analysis (BET). Characterization results suggested that MoO 2 was present in the catalyst and its crystallinity improved with increased Mo-loading. The catalysts had a larger specific surface area due to the presence of MoO 2 dispersed on g-C 3 N 4 . Experimental results showed that 3%-MoO 2 /g-C 3 N 4 had the highest catalytic activity among all the catalysts tested. A desulfurization rate of 96.0% was achieved under optimal conditions. Through gas chromatography-mass spectrometry (GC–MS) analysis, it was shown that dibenzothoiphene sulfone was the sole product of the oxidation desulfurization reaction. An apparent activation energy of 61.1 kJ/mol was estimated based on Arrhenius equation. The activity of 3%-MoO 2 /g-C 3 N 4 slightly decreased after six runs. A possible mechanism for the reaction has been proposed.
研究领域:
化学工程
·
材料科学
✓ 已验证
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2021
·
IF 4.539
Chunyan Zhang,Zhendong Fu,Feng Hong,Ge Pang,Tengri Dong,Yunxiao Zhang,Guixia Liu,Xiangting Dong,Jinxian Wang
Broad spectrum response photocatalyst is crucial for making full use of sunlight and widely used in efficient photocatalytic degradation of organic dyes. In this work, upconversion luminescence boosted broadband photocatalysts based on BiF 3 :Yb 3+ , Er 3+ nanoparticles (BFY) and the carbon nitride doped with various masses of barbituric acid (CNB x ) semiconductor materials (BFY/CNB x ) were successfully designed and produced for photocatalysis in UV–Vis–NIR region. Compared with pure g-C 3 N 4 , BFY/CNB 0.5 composites have better photocatalytic performance attributed to the utilization of broadband spectrum energy and effective charge separation. After 30 min illumination by visible light , photodegradation efficiency of RhB reaches about 99.4% by using BFY-2/CNB 0.5 . A plot of C/C 0 versus time indicates that the BFY-2/CNB 0.5 can degrade about 64.7% of RhB in 80 min by NIR irradiation. Under simulated solar light, the sample of BFY-2/CNB 0.5 reaches a maximum degradation efficiency of 98.0% within 15 min. The strengthened photocatalytic activity is due to the synergistic effect of CNB 0.5 and upconversion materials. The active species utilized in the degradation process were examined using capture experiments. After four continuous photocatalytic cycles, about 94.0% of RhB solution is degraded. The photocatalytic mechanism of the composite photocatalysts is also analyzed in detail. The results indicate that the prepared BFY/CNB 0.5 photocatalysts have good prospects in the field of environmental remediation.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
Applied Catalysis O: Open
·
2024
·
IF 0
Yongsi Jiao,Cunjun Li,Yanqi Xu,Limei He,Linjiang Wang
Photodegradation of indigo carmine (IC) in wastewater has received much attention in recent decades. However, the current photocatalysts used for IC photodegradation suffer from an unsatisfactory efficiency due to low yield of reactive species. Herein, a P-modified biochar/g-C 3 N 4 (P-BC/CN) photocatalyst was fabricated by mechanochemical method using P-modified biochar and g-C 3 N 4 as precursors. It is discovered that P N bonds were constructed between P-modified biochar and g-C 3 N 4 , and these bonds served as the active sites to promote the generation of •O 2 − during the photodegradation process. The biochar component in P-BC/CN composite is conducive to transfer the photogenerated carriers, thereby avoiding their recombination. The photodegradation experiment showed that the P-BC/CN composite exhibits an impressive photodegradation performance towards IC ( C 0 = 50 mg/L) with a photodegradation rate of 95.3% in 120 min. This work provides a green and efficient method to design biochar-based photocatalyst with P N active sites for advanced wastewater purification.
研究领域:
环境科学
·
材料科学
·
化学工程
✓ 已验证
DOI
Materials Research Express
·
2021
·Vol. 8
·期 12
·125006
·
IF 1.62
Peng She,Chun Yao,Jun Li,Hegang Bao,Xiuquan Xu,Hong Zhou
Co-doping is one of the most facile and efficient strategies for boosting the photocatalytic performance of g-C3N4. Herein, a series of Ti and O co-doped g-C3N4 (Ti/OCN) composites with excellent photocatalytic inactivation activity of Enterobacter cloacae (E. cloacae) were successfully synthesized by simple calcination of urea/formic acid/TiCl4 precursor. The obtained Ti/OCN-3 possessed the optimal photocatalytic capability with complete inactivation of 6.20 log CFU·ml−1 E. cloacae under 60 min of visible light irradiation. The improved photocatalytic disinfection performance was probably attributed to the synergistic effect of Ti and O co-doping, which led to an extended visible light response and accelerated charge transport efficiency. Furthermore, scavenger trapping and electron spin resonance (ESR) experiments revealed that ·O2−, h+ and ·OH were responsible for the enhanced inactivation activity. Overall, this research provided a promising strategy for fabricating g-C3N4-based catalysts to efficiently deal with the hazards of pathogenic microorganisms.
研究领域:
环境科学
·
微生物学
·
材料科学
✓ 已验证
DOI
高影响因子
Journal of Food Measurement and Characterization
·
2024
·Vol. 18
·期 3
·2420-2427
·
IF 2.9
Chen Fazheng,Jiang Zhiyong,Yang Shiyou
In the present work, the surface of glassy carbon electrode (GCE) was modified with graphitic carbon nitride (g-C 3 N 4 ) prepared from the freeze-dried dicyandiamide. The physiochemical properties and electrocatalytic ability of the g-C 3 N 4 nanosheets have been well investigated. Differential pulse voltammetry (DPV) method was employed to determine bisphenol A (BPA) using the modified GCE. To obtain the conditions for maximum DPV response, the effects of experimental parameters, such as the solution pH and nano-sized modifier concentration, were investigated and optimized. The proposed BPA sensing assay indicated a linear range of 0.01 to 75.0 µM under optimal conditions, with a detection limit of 9.0 nM. The anti-interference investigations revealed that the presence of various organic and inorganic species did not hinder the accurate measuring of BPA. In addition, the presented modified electrode exhibited satisfactory results in terms of stability and reproducibility. The obtained results also confirm the efficacy of the g-C 3 N 4 nanocatalyst for determination of BPA in different real samples (drinking water, milk and orange juice) with satisfactory recovery values (95.6–104.0%). The suggested assay provides a powerful sensing platform for the fast and sensitive analysis of BPA in food samples.
研究领域:
分析化学
·
材料科学
·
电化学
·
食品安全
·
环境监测
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2018
·
IF 3.057
Minquan Sun,Shuling Shen,Zhujun Wu,Zhihong Tang,Jiaping Shen,Junhe Yang
A novel rice spike-like g-C 3 N 4 /TiO 2 nanowire heterojunctions are fabricated by hydrothermal treating Na 2 Ti 3 O 7 ultralong nanotubes in the presence of g-C 3 N 4 . The presence of g-C 3 N 4 promotes the hydrolysis of Na 2 Ti 3 O 7 ultralong nanotubes. The partially replaced O of TiO 2 by N from g-C 3 N 4 leads to the formation of a tight-binding interface between one dimensional TiO 2 and two dimensional g-C 3 N 4 , which is crucial for fast and effective transfer of photogenerated electrons in heterostructured photocatalysts . As a result, the g-C 3 N 4 /TiO 2 nanowire heterojunctions exhibit excellent visible-light photocatalytic activity. The kinetic constant (k) of g-C 3 N 4 /TiO 2 (0.024 min −1 ) for degradation of methylene blue under visible light irradiation is 1.85 and 4 times than that of pure g-C 3 N 4 and P25, respectively.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）