JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
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.
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DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2021
·
IF 7.46
Yong-Yi Zhao,Huan Luo,Qingmei Ge,Mao Liu,Zhu Tao,Hang Cong
With a facile preparation for graphitic carbon nitride quantum dots (g-C 3 N 4 QDs), an ultrasensitive photoelectrochemical (PEC) sensor was developed with the supramolecular affinity of chiral multifarene[3,2,1] (CMF) to a hormone drug, thyroxine (T 4 ), for efficient identification of thyroxine enantiomers. In the principle that g-C 3 N 4 QDs was employed to achieve the photocurrent response and the macrocyclic compound served as the supramolecular enantiorecognition for thyroxine, the photoelectrochemical electrode was constructed by layer-by-layer assembly of g-C 3 N 4 QDs and CMF on the surface of ITO (ITO-g-C 3 N 4 -CMF QDs). The proposed PEC sensor produced the limits of detection low to 67 pM towards L -T 4 and 85 pM towards D -T 4 in a concentration range from 0.1 nM to 10 nM, which was superior to the values in pioneering reports with colorimetric or electrochemical methods. With good stability, reproducibility, repeatability anti-interference ability, and acceptable recoveries, the proposed PEC sensor was employed for quantitative determination of L/D -T 4 in water, human serum and commercial tablet.
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高影响因子
Desalination and Water Treatment
·
2024
·
IF 1
Xiang Li,Wei Li,Shiyu Xie,Guoming Zeng,Sarfaraz Khan
Despite low exposure level in the water, environmental hormone pollutants can still inflict significant biological effects that endanger ecological safety and human reproduction. However, they are unable to be effectively removed using ordinary water treatment methods, which makes the deposition of environmental residues highly likely. In light of this demand, this study synthesized metal-doped g-C 3 N 4 composite photocatalysts and coupled them with nitrogen doped ordered mesoporous (NMC) carbon to treat water contaminated by environmental hormone micropollutants. The experimental results show that AgIn 5 S 8 /g-C 3 N 4 (25%) makes the prime candidate for degrading bisphenol A (BPA), displaying the highest degradation rates of 82%. Moreover, h+ and·O 2− were found to be the main active substances in the photocatalytic process, while the degradation rate of BPA by AgIn 5 S 8 /g-C 3 N 4 (25%) was still over 80% after 5 repeated photocatalyses. When the nitrogen doped ordered mesoporous carbon was coupled with AgIn 5 S 8 /g-C 3 N 4 (25%), the degradation and removal rates of BPA were greatly improved, demonstrating up to 94.8% removal rate in batch treatment. Furthermore, NMC/AgIn 5 S 8 /g-C 3 N 4 also exhibited good adsorption–photocatalytic synergy under continuous flow conditions of the fluidized bed, and the highest removal rate of BPA in the dark-free adsorption experiment was about 98.1%.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Zhixin Liu,Yongdi Liu,Xianbo Sun,Haodong Ji,Wen Liu,Zhengqing Cai
A novel Z-scheme Ag/AgVO 3 /carbon-rich g-C 3 N 4 heterojunction with excellent solar-light-driven photocatalytic activity was constructed via a facile hydrothermal-calcining method. The Ag/AgVO 3 /carbon-rich g-C 3 N 4 composites displayed superior performance for the photocatalytic degradation of sulfamethiadiazole (SFZ) under solar irradiation. The optimal composite with a 10 wt% Ag/AgVO 3 content showed the highest photocatalytic activity, its degradation rate constant ( k ) for SFZ degradation was ∼13 and 30 times than that of carbon-rich g-C 3 N 4 (CCN) and Ag/AgVO 3 , respectively. Furthermore, •O 2 – was identified as the most crucial reactive species in the Z-scheme photocatalysis system. The greatly improved photocatalytic activities are derived from the built-in electric field (BIEF) of CCN and efficient Z-scheme charge transfer with Ag nanoparticles as charge transmission-bridge. The possible photocatalytic degradation mechanism and pathway over Ag/AgVO 3 /carbon-rich g-C 3 N 4 were proposed based on LC-MS analysis and density functional theory (DFT) calculation, and the toxicity of intermediates was evaluated by Quantitative structure–activity relationship (QSAR) based prediction. In summary, this work provides new insight into constructing highly efficient Z-scheme photocatalyst, which is promising for implementation in surface water remediation.
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高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Pin Chen,Siyuan Di,Xiaoqing Qiu,Shukui Zhu
In order to achieve excellent visible light photoactivity of TiO 2 , it is still urgently required to extend their optical absorption ability and improve the potential of charge separation and migration. Here we synthesized highly efficient visible-light-active catalysts F-TiO 2 /g-C 3 N 4 via a one-step-calcination method. Due to the synergic effect of ≡Ti−F, ≡Ti:F−H and the heterojunction, the obtained catalysts possess promising properties as highly efficient separation and migration of photoelectron-hole pairs. The prepared F-TiO 2 /g-C 3 N 4 heterojunction can be successfully applied to degrade the widely used flame retardants and antibiotics. More than 95% of tetrabromobisphenol A (TBBPA) was decomposed after light illumination for 120 min, and 98% of sulfamethazine (SMZ) was degraded for 60 min by F-TiO 2 /g-C 3 N 4 . Furthermore, a reasonable catalytic mechanism for the F-TiO 2 /g-C 3 N 4 catalysts was proposed. It could be seen that the active species •O 2 − , •OH, and h + played important roles in the photocatalytic process under visible light illumination.
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高影响因子
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2022
·Vol. 24
·期 12
·7521-7530
·
IF 3.945
Qixiao Gai,Shoutian Ren,Xiaochun Zheng,Wenjun Liu,Quanli Dong
Low-cost and high-abundance Cu nanostructures are potential near-infrared (NIR) surface plasmonic resonance (SPR) photosensitizers for carbon nitride (C3N4) photocatalysts, but their low activity and stability need to be improved. In this article, doping S into C3N4 (S-C3N4) creates anchoring sites for photo-deposited Cu nanoparticles (NPs), and the spontaneous construction of S-Cu bonds is realized between S-C3N4 and Cu NPs. The optimal hydrogen evolution rate of 1.64 mmol g−1 h−1 is obtained for S-C3N4–Cu, which is 5.5, 4.6 and 1.7 times that of pure C3N4, S-C3N4 and S-C3N4–Cu, respectively. With further loading of a Pt co-catalyst to confirm the role of Cu NPs and improve the photocatalytic activity of the SCN–Cu, the photocatalytic rate can reach up to 14.34 mmol g−1 h−1. Due to the NIR SPR effect of Cu NPs, the apparent quantum efficiency (AQE) of S-C3N4–Cu at 600 and 765 nm is 2.02% and 0.47%, respectively. The enhanced photocatalytic performance of S-C3N4–Cu compared with C3N4–Cu is mainly due to the introduced S–Cu bonds that improve the injection rate of hot electrons. This solution provides a simple and efficient interface optimization strategy for the construction of efficient NIR-driven photocatalysts.
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高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2018
·
IF 6.434
Jiafeng Ding,Gaoyuan Long,Yang Luo,Runze Sun,Mengxia Chen,Yajun Li,Yanfang Zhou,Xinhua Xu,Weirong Zhao
Polychlorinated dibenzo- p -dioxins (PCDDs), as a group of notorious anthropogenic environmental toxicants, are arguably ubiquitous in nature. In this study, we investigated the photocatalytic reductive dechlorination of 2-chlorodibenzo- p -dioxin (2-CDD) over Pd/g-C 3 N 4 catalysts under UV–vis irradiation. The g-C 3 N 4 and a series of Pd/g-C 3 N 4 catalysts were prepared by thermal polymerization and mechanical mixing-illumination method and characterized by XRD, TEM, BET, SEM and UV–vis DRS analyses. Among all the samples, the Pd/g-C 3 N 4 (5 wt%) yielded the optimal dechlorination activity with a total 2-CDD conversion of 54% within 4 h, and 76% of those converted 2-CDD were evolved to dibenzo- p -dioxin (DD). The kinetics of dechlorination could be described as pseudo-first-order decay model (R 2 > 0.84). Corresponding rate constants (k) increased from 0.052 to 0.17 h −1 with Pd contents up to 5 wt% and decreased to 0.13 h −1 with a 10 wt% of Pd. The enhanced activities originated from the surface plasmonic resonance (SPR) effect of Pd nanoparticles and the formation of Schottky barrier between Pd and g-C 3 N 4 , which extend the spectrum responsive range and suppress the charge recombination of g-C 3 N 4 . This is the first report on the photocatalytic reductive removal of PCDDs and may provide a new approach for PCDDs pollution control.
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高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2019
·
IF 6.361
Huinan Che,Guangbo Che,Pengjie Zhou,Chunbo Liu,Hongjun Dong
It is very challenging to fabricate novel, high-efficiency photocatalysts with an enhanced visible light absorption capacity, high charge carrier separation efficiency, and large specific surface area . For this purpose, a yeast-derived carbon (YC) sphere was added as a charge carrier bridge to the 2D-2D Cu 2 WS 4 /g-C 3 N 4 heterojunction through a facile hydrothermal method . The YC sphere, as a bridge for electrons, is not only advantageous in inhibiting rapid recombination by electrons, but also remarkably enhances the visible light absorption capacity. Moreover, the YC sphere can also increase the specific surface area and surface roughness , which can enhance the adsorption of pollutant molecules and provide abundant active sites for photocatalytic reactions. The g-C 3 N 4 /YC/Cu 2 WS 4 heterojunction showed the best photocatalytic activity for reducing hexavalent chromium Cr(VI) and decomposing tetracycline (TC) under visible light. Meanwhile, the acute toxicity of Daphnia magna (D. magna) gradually decreases with the conversion of Cr(VI) to Cr(III) in solution. In addition, the possible intermediate products and the photocatalytic reaction mechanism are revealed in depth. This work provides a general example for improving the photocatalytic activity of 2D-2D based heterojunctions by introducing a biomass material.
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高影响因子
APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Jianchang Gan,Huihu Wang,Haiping Hu,Ming Su,Feng Chen,Huang Xu
By rationally adjusting the band position of CuInZnS in CuInZnS/g-C 3 N 4 hybrids, we reveal the effects of fine turning the band matching on CO 2 reduction and methyl orange near-infrared degradation. The novel design strategy of CuInZnS/g-C 3 N 4 hybrids, including orderly energy band regulation of CuInZnS and surface carboxylation of g-C 3 N 4 , effectively enhances the light absorption capacity and separation efficiency of photogenerated carriers. In addition, L-cysteine was used as sulfur source for in situ synthesis of hybrids. Using the abundant functional groups of L-cysteine molecules to form bonds and interactions with carboxylated g-C 3 N 4 can effectively improve the dispersion and interface binding of CuInZnS/g-C 3 N 4 hybrids, thus enhancing the transport of carriers at the interface. Benefitting from band matching and interface binding characteristics, the optimized CuInZnS/g-C 3 N 4 hybrids manifest remarkable performance for CO 2 reduction with high CO production rate of 50.04 μmol/g in 8 h and excellent activity for methyl orange near-infrared degradation with 96.5% efficiency in 5 h.
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高影响因子
Journal of Materials Chemistry A
·
2019
·Vol. 7
·期 32
·19173-19186
·
IF 10.733
Xiaoming Liu,Xueya Chen,Yizu Li,Bingquan Wu,Xubiao Luo,Sheng Ouyang,Shenglian Luo,Abdulaziz A. Al Kheraif,Jun Lin
Here, we demonstrate a g-C3N4@Au@SrAl2O4:Eu2+,Dy3+ composite as a novel efficient self-luminous visible-light plasmonic photocatalyst for photocatalytic degradation of organic pollutants and hydrogen evolution from water around the clock. The g-C3N4@Au@SrAl2O4:Eu2+,Dy3+ composite was prepared by integrating a g-C3N4@Au plasmonic photocatalyst composite with a SrAl2O4:Eu2+,Dy3+ long-afterglow phosphor through a simple Pechini-type sol–gel method followed by a mechanical mixing and high-temperature calcination process. Owing to the synergistic effect of surface plasmon resonance of the Au nanoparticles in g-C3N4 and long-lasting phosphorescence of the SrAl2O4:Eu2+,Dy3+ phosphor, the prepared g-C3N4@Au@SrAl2O4:Eu2+,Dy3+ composite shows a continuous and efficient photocatalytic activity for photocatalytic degradation of organic pollutants and hydrogen evolution from water in a sunless environment. The current research study could provide a new strategy for designing a highly efficient composite photocatalyst for solar environmental purification and hydrogen energy production around the clock.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Zijie Liu,Seulgi Ji,Shiqi Zhao,Xinge Hu,Xingda An,Tianqi Liu,Xiaorong Cheng,Heechae Choi,Graham Dawson
In order to boost the photocatalytic water splitting activity of g-C 3 N 4 , depositions of various multiple cocatalyst combinations have been suggested in a number of previous studies. Despite the improvement in photocatalytic activities bestowed on g-C 3 N 4 layers by the junctions of multiple cocatalyst particles at once, the complexities of synthesis procedures and fabrication conditions retard the wider applications or commercialization of such materials. In this study, we introduce a new effective strategy to improve the activity of a g-C 3 N 4 photocatalyst in water splitting: dual function hole carrier transport enhancement and reduced surface reaction energy barrier with phase-control of Fe 2 O 3 . The self-assembled solvothermal composites of Fe 2 O 3 and g-C 3 N 4 resulted in the formation of a three-phase heterojunction. The best composite demonstrated an effective hydrogen production rate of 5.53 mmol g −1 h −1 . The formation of the three-phase heterojunction between the two components was shown to alter the chemical environment and a band diagram of the system is proposed. Our density functional theory (DFT) calculations and ultraviolet photoemission spectroscopy (UPS) measurements revealed that the combination of ε-Fe 2 O 3 and α-Fe 2 O 3 improves the photocatalytic activity of g-C 3 N 4 by Fermi level pinning.
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高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2025
·
IF 8.3
Yixin Sun,Jiawen Liu,Xinyang Xu,Zhonghua Li
In the strategies of modifying g-C 3 N 4 by changing its electron transport structure, it has been demonstrated that constructing donor-acceptor (D-A) or D-π-A g–C 3 N 4 –based conjugated copolymers can obviously accelerate the separation of charge carriers. Inspired by their advantages, a novel g–C 3 N 4 –based D-A 1 -π-A 2 type polymer was designed and synthesized via the thermal copolymerization of urea and PA-PM (the product of the amidation reaction between PA and PM). As a result, the prepared CN-PA-PM photocatalysts with D-A 1 -π-A 2 structure not only improve visible-light response, but also promote the separation of charge carriers, thereby achieving superior photocatalytic hydrogen evolution activity. The optimized CN-PA-PM-13 polymer has the best hydrogen evolution efficiency of 17.79 mmol g −1 h −1 under visible light (λ > 420 nm), which is 33.7 times that of pure g-C 3 N 4 . This work presents a new design concept for g–C 3 N 4 –based polymer photocatalysts with high optical absorption capability and effective carrier separation ability.
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高影响因子
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