Frontiers in Chemistry
·
2022
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IF 5.545
Yang Shuhui,Ke Xi,Zhang Menglong,Luo Dongxiang
Metal nanoparticles have been extensively used as co-catalysts in photocatalytic systems in order to pursue improvements in both reaction kinetics and selectivity. In this work, PdAg dual-metallic nanoparticles synthesized by the co-reduction method were decorated on a well-established α-Fe2O3/CdS Z-scheme photoactive material as a co-catalyst to study their performance for promoting the photoreduction of CO2. Herein, α-Fe2O3 and CdS were in situ synthesized on fluorine-doped tin oxide (FTO) glass by hydrothermal and SILAR (successive ionic layer adsorption and reaction) methods, respectively. The direct Z-scheme charge transfer path between Fe2O3 and CdS and the effective electron migration toward the PdAg mainly contributed to the excellent photocatalytic CO2 reduction performance. The controllable work function based on Pd (5.12) and Ag (4.26) constructed an appropriate band alignment with α-Fe2O3/CdS and displayed favorable production for CH4 rather than CO. The optimum ratio of PdAg 1:2 performed a 48% enhancement than pure Pd for photoreduction of CO2. Meanwhile, the enhanced charge separation improved the photoelectrochemical performance and photocurrent generation, and reduced the electrical resistance between components. This work provided insights into the dual-metallic co-catalyst for boosting the activity and selectivity of photocatalytic CO2 reduction.
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Molecular Catalysis
·
2019
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IF 2.938
Tao Lv,Haifan Wang,Wei Hong,Peng Wang,Lishan Jia
In the present work, an indirect Z-schematic heterojunction system of TiO 2 and LaFeO 3 (LFO) with a solid state electron mediator (RGO) is proposed and applied for photocatalytic hydrogen (H 2 ) evolution. Through a facile 2-step synthesis strategy including adsorption of LFO on GO sheets and growth of TiO 2 between the LFO-GO frameworks, a Ti-O-C bonds strongly linked sandwich-like TiO 2 /RGO/LFO composite is obtained. The structure, morphology, optical properties and catalytic mechanism of the Z-scheme heterojunction are thoroughly investigated. The obtained visible light responded TiO 2 /RGO/LFO composite displays significantly elevated photocatalytic performance for H 2 evolution with excellent stability, and its H 2 production rate (0.893 mmol h −1 g -1 ) is approximately 3.2, 14.4 and 11.4 times superior to the direct Z-scheme TiO 2 /LFO composite, pure TiO 2 and LFO, respectively. The sandwich-like structure with strong interaction between three components and short diffusion distance for impactful separation of e--h + pairs bring about a vast improvement in H 2 evolution performance of TiO 2 /RGO/LFO composite. In addition, Ti-O-C bonds could also enhance electronic conductivity and structure stability as a bridge of photogenerated carriers. Based on the investigation results, possible mechanisms for synthesis and photocatalytic charge transfer pattern for TiO 2 /RGO/LFO are developed.
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CHEMICAL ENGINEERING JOURNAL
·
2024
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IF 13.3
Xiangwei Zou,Bo Sun,Liang Wang,Hongcun Bai,Xiangchao Meng,Chunhu Li,Zizhen Li
Designing low-cost and efficient photocatalysts for the degradation of antibiotic contaminants in water is crucial for environmental remediation. In this study, we synthesized SnS 2 /Bi 2 MoO 6-x composites with a synergistic modulation of oxygen vacancies (OVs) and a Z-scheme charge transfer mechanism using a simple hydrothermal method. The synthesized composites, designated as SBMO-5, were used for the photocatalytic degradation of tetracycline (TC). Notably, SBMO-5 exhibited the highest reaction rate constant (0.01385 min −1 ), surpassing pristine SnS 2 (0.00129 min −1 ) and Bi 2 MoO 6 (0.00312 min −1 ) by 10.7 and 4.4 times, respectively. The enhanced photocatalytic degradation performance can be ascribed to the synergistic effect of the Z-scheme electron transfer mechanism and OVs. The unique Z-scheme electron transfer channel both accelerated the separation of photogenerated charge carriers and exploited the strongest oxidation and reduction capabilities within the constituent materials. Furthermore, the low-cost and readily available OVs modification enhanced absorption of visible light. Additionally, we investigated the influence of various experimental conditions on the degradation efficiency of SBMO-5, predicted the degradation pathways of TC , and evaluated the toxicity of the intermediates. Overall, this study provides insights into the application of efficient catalysts for pollutant degradation under a multi-electric field modulation strategy.
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CHEMICAL ENGINEERING JOURNAL
·
2021
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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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Scientific Reports
·
2025
·Vol. 15
·期 1
·1-16
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IF 3.9
Dong Yuqi,Qiao Qing-an,Wang Ruping,Yang Yueyue,Cai Honglan,Gao Hongwei
Environmental pollution caused by industrial waste is an increasing concern, and the design and development of efficient photocatalysts offer promising approaches to address this issue. A series of novel Zn 0.6 Cd 0.4 S/ZnO/g-C 3 N 4 composites were prepared through a calcination‒hydrothermal method. Under visible light, these materials demonstrated exceptional performance in the photodegradation of methylene blue (MB), rhodamine B (RhB), and tetracycline (TC). Among the composite materials, Z 0.6 C 0.4 S/ZnO/CN-35% exhibited the highest degradation efficiencies for MB (98.52%), RhB (99.45%), and TC (98.20%), demonstrating excellent reusability as well. The photocatalytic performance of the catalysts was assessed across various water sources and different pH conditions. The findings revealed that the degradation efficiency for contaminants in seawater, lake water, and tap water closely mirrored that observed in deionized water, suggesting wide adaptability among different aqueous solutions. The exceptional photocatalytic performance of the composite materials can be attributed primarily to the efficient separation and migration of holes (h + ) and electrons (e − ) via well-contacted interfaces. Free radical capture experiments confirmed that hydroxyl radicals (·OH) and superoxide ion radicals (·O 2 - ) play crucial roles in the reaction process. The photocatalytic mechanism was also revealed via density functional theory (DFT) calculations. This work introduced an innovative strategy to design and fabricate novel photocatalysts, emphasizing their extensive applications from both theoretical and experimental aspects.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2021
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IF 5.816
Tingting Yu,Qingsong Liu,Guang Chen,Lifen Liu,Jinlong Zhang,Changfei Gao,Tao Yang
A novel heterostructure of g-C 3 N 4 /ZnO/Bi 4 O 5 Br 2 (ZB-3) was designed, and used in the microbial coupled photocatalytic fuel cell (MPFC). It can effectively improve electron utilization efficiency and pollutant degradation using this double Z-scheme heterojunction structure . The current–time ( I – t ) curves demonstrated that the current density of ZB-3 was higher than that of ZnO, ZnO/Bi 4 O 5 Br 2 (ZB-1), g-C 3 N 4 /ZnO (ZB-2). Electrochemical impedance spectroscopy (EIS) indicated ZB-3 possessed the minimum charge-transfer resistance. This MPFC for degrading rhodamine B (RhB) and tetracycline (TC) under different conditions were developed using these materials. Even in the dark condition, MPFC with g-C 3 N 4 /ZnO/Bi 4 O 5 Br 2 demonstrated 93% and 82% degradation efficiency for RhB and TC, respectively. Furthermore, the electron transport mechanism of the MPFC and ZB-3 were proposed. It paves the approach for more efficient pollutant degradation via MFC photocatalysis .
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Applied Materials Today
·
2020
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IF 8.352
Xin Du,Tianyu Zhao,Ziyuan Xiu,Zipeng Xing,Zhenzi Li,Kai Pan,Shilin Yang,Wei Zhou
Novel BiVO 4 @ZnIn 2 S 4 /Ti 3 C 2 MXene quantum dots (QDs) assembly all-solid-state direct Z-scheme photocatalyst is fabricated via in-situ growth combined with two-step solvothermal strategy, which forms a hierarchical core-shell structure. The proper energy band structure of BiVO 4 and ZnIn 2 S 4 and the formation of a good solid-solid contact interface between them promote the construction of Z-scheme system, which achieves effective charge separation. It is surprisingly discovered that Ti 3 C 2 MXene QDs can be applied as cocatalysts for photocatalytic overall water splitting, which could accelerate the surface redox kinetics of the catalyst due to the unique properties of Ti 3 C 2 MXene QDs . In particular, due to its excellent metal conductivity, a Schottky barrier can be formed at the interface in contact with ZnIn 2 S 4 , further promoting charge separation. BiVO 4 @ZnIn 2 S 4 /Ti 3 C 2 MXene QDs achieves effective visible-light-driven pure water splitting into O 2 and H 2 evolution rates up to 50.83 and 102.67 μmol g −1 h −1 (~1:2). In addition, it also shows high photocatalytic degradation Bisphenol A efficiency of ~96.4 %. The high photocatalytic performance can be ascribed to the all-solid-state direct Z-scheme structure favoring spatial charge separation, Ti 3 C 2 MXene QDs as cocatalysts promoting proton reduction, and hierarchical core-shell structure offering more surface active sites. This work provides new insights to fabricate high-performance direct Z-scheme assembly system.
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Journal of Environmental Chemical Engineering
·
2026
·Vol. 14
·期 2
·122081
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IF 7.5
Yongming Zhong,Yangting Liao,Rongni Dou,Xiaolong Yu,Jin Tang,Hang Liu,Dan Liu,Yuming Fang,Yilun Luo,Jianteng Sun
The synthesis of novel film-like photocatalysts is an effective strategy for reducing Cr(VI). Herein, a Z-scheme ZnIn 2 S 4 –CdS heterojunction photocatalyst was fabricated on a self-assembled graphene-based substrate via hydrothermal and solvothermal methods. By controlling the ethanol:water ratio during solvothermal synthesis, differently sized CdS nanoparticles were grown on the ZnIn 2 S 4 nanosheets surface for regulating the photocatalytic activity of ZnIn 2 S 4 –CdS heterojunction. The three-dimensional layered structure of the graphene film provided abundant active sites for material loading and its excellent conductivity rapidly transferred photogenerated electrons. Compared to the ZnIn 2 S 4 –CdS heterojunction samples with other controlled structure, graphene-based film-like photocatalyst bring advantage in enrich photocatalysts for bursting out better activity. Under visible light irradiation, the synthesized RZC-40 sample exhibited a photocatalytic efficiency of 91.02% in photoreducing 20 mg L −1 Cr(VI) within 50 min, highlighting the feasibility and promising practical application prospects of synergistic film-like photocatalysts and laying a theoretical foundation for the further development of photocatalysts with improved activity.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2026
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IF 9.7
Haileyesus Hatano Haitosa,Osman Ahmed Zelekew,Pu Chen,Daniel Manaye Kabtamu,Weimao Yan,Hong Wang,Yi-nan Wu
Fluoroquinolone antibiotics like ciprofloxacin (CIP) pose environmental risks when released into water. Herein, a visible-light-active Fe-doped NH 2 -UiO-66(Zr)@AgI Z -scheme heterostructure was prepared via an ion exchange precipitation method. By varying AgI content, reduced particle size and enhanced charge separation for efficient photodegradation was achieved. The optimum composition (Fe-UNH@AgI-20) exhibited a 95.2 % degradation efficiency toward CIP after 60 min of visible-light irradiation. It also showed high removal efficiencies for tetracycline, lomefloxacin, and Rhodamine B. Reaction kinetics followed pseudo-first-order behavior, with rate constants significantly higher than those of pristine NH 2 -UiO-66(Zr) and AgI. The catalyst maintained 85.1 % activity after cycles, indicating good stability. Scavenger tests and electron paramagnetic resonance (EPR) analyses identified holes (h + ), superoxide radical (•O 2 − ), and hydroxyl radical (•OH) as key reactive species. Fe doping enhanced visible-light absorption and created defect sites, while AgI introduction promoted charge separation and suppressed AgI photocorrosion. Under irradiation, a small fraction of Ag + was reduced to metallic Ag, forming an electron bridge that switched the initial type-II heterojunction to a Z -scheme configuration. This Z-scheme mechanism efficiently separated carriers, facilitated generation of ROS, and enabled thorough mineralization of CIP; toxicity predictions showed most products were less mutagenic than CIP, confirming reduced ecological risk. The findings demonstrate that the Fe-doped NH 2 -UiO-66(Zr)@AgI heterostructure is a promising photocatalyst for antibiotic-contaminated wastewater remediation.
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PubMed
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JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
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2026
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IF 6.7
Liangman Shi,Lunhui Zhu,Jialing Cao,Xiaoyan Xu,Xiaoshu Tang,Shuang Zhang,Lianfu Zhang,Cheng Yang
A rapid method for producing cis-(Z)-lutein esters from all-E-lutein esters was developed using I2, AlCl3, and sulfides as catalysts. Z-Isomer-rich lutein (38.6%) and Z-isomer-rich lutein esters (34.8%) by I2 were obtained. The antioxidant activities of Z-isomer-rich lutein and Z-isomer-rich lutein esters were higher than those of their all-E-isomers by Ferric Reducing Antioxidant Power, ORAC-L, and ABTS assays. The UV-A and UV-B blocking activities of Z-isomer-rich lutein esters were higher than those of all-E-lutein esters. After short-term ingestion by rats, the in vivo absorption concentration of Z-isomer-rich lutein (222.3 pmol/mL) in a high dose was higher than those of other forms of lutein (<125.6 pmol/mL). Enrichment of Z-lutein (Z-ratio: 59.5%) and Z-lutein esters (Z-ratio: 44.4%) was achieved in hexane and ethanol, respectively. We conclude, for the first time, that Z-isomer-rich lutein esters play a more important role than all-E-lutein esters in preventing oxidation and UV-blocking activity and are estimated to exhibit higher bioavailability than all-E-lutein esters and all-E-lutein.
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Catalysis Science & Technology
·
2026
·
IF 4
Xianfeng Zhang,Hao Zhang,Jingbo Lu,Sun Zhao,Jianjian Cheng,Han Zhou,Yuting Liang
This study reports the successful fabrication of a novel ternary heterojunction photocatalyst, denoted as CBA (g-C3N4/BiOI/Ag2CrO4), featuring a double Z-scheme charge transfer pathway aimed at the effective degradation of the toxic azo dye Sudan red III under visible light. The synthesis commenced with the fabrication of porous g-C3N4 via calcination coupled with a subsequent etching process. BiOI nanospheres were then grown onto the g-C3N4 substrate via a hydrothermal route. Subsequently, Ag2CrO4 nanoparticles were anchored on the g-C3N4/BiOI composite via a straightforward precipitation technique. The experimental evidence confirms successful formation of a ternary heterojunction, which exhibits a mesoporous structure and enhanced visible-light absorption. Evaluation of photocatalytic performance revealed that the optimized CBA catalyst (containing 30% g-C3N4/BiOI) attained a Sudan red III degradation efficiency of 82.37% under 90 min visible-light irradiation, with a pseudo-first-order rate constant of 0.01944 min−1. This constant value is 31.35 times that of the binary g-C3N4/BiOI system and 1.99 times that of individual Ag2CrO4. The remarkable photocatalytic enhancement is attributable to the established dual Z-scheme mechanism. This configuration effectively facilitates photogenerated charge separation, broadens visible-light absorption, and maintains high redox potentials. Thus, this work advances the design of efficient g-C3N4-based heterojunction systems, offering a viable strategy for photocatalytic purification of dye wastewater.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2026
·
IF 6.7
Shuyue He,Jincheng Dai,Gang Liu,Xiyu Song,Hongjuan Zhang,Ruyi Xie
The persistent accumulation of organic pollutants in aquatic environments poses serious risks to ecosystems and public health. In this study, a double Z-type photocatalyst BiOBr/BiOI/MIL-53(Fe)-min was successfully fabricated by a two-step solvothermal-hydrothermal synthesis method. Characterization revealed tightly stacked BiOBr/BiOI nanosheets uniformly coating rod-like the 2-methylimidazole-modified metal–organic framework MIL-53(Fe) (MIL-53(Fe)-min), forming a core-shell structure with intimate interface contact. The formation of a unique double Z-type heterojunction significantly inhibited the recombination of photogenerated electron-hole pairs and optimized the charge carrier transfer pathway. Meanwhile, the surface stacked catalyst nanosheets not only improve the utilization efficiency of photons, but also greatly increase the contact area between active radicals and reactants. Under visible light irradiation, BBF-20 composite photocatalyst demonstrated a tetracyclines (TC) degradation rate of 90.6% within 100 min, with 80.3% of its activity retained after five cycles. Notably, polyethylene terephthalate (PET) microplastics achieved 56% weight loss after being treated by BBF-20 for 8 h. The main active species during degradation process were determined through quenching experiment and EPR tests. HPLC-MS analysis proposed the possible degradation pathways for TC and PET microplastics. Based on experimental results, a double Z-type heterojunction mechanism was proposed. This work presents a novel strategy for designing efficient photocatalysts to degrade antibiotics and microplastics in complex aquatic environments.
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