JOURNAL OF ALLOYS AND COMPOUNDS
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2025
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IF 6.3
Jian Gao,Shu Wang,Shuang Han,Wenlong Yang
The rational design and efficient utilization of room-temperature ferroelectric physical field photocatalysts are of significant importance for addressing energy and environmental challenges. In this work, ferroelectric-based Zn 0.5 Cd 0.5 S/PbTiO 3 S-scheme heterojunction photocatalyst was synthesized via a facile and mild two-step hydrothermal method. The heterostructure was constructed through in-situ selective growth of Zn₀.₅Cd₀.₅S nanoparticles onto the positively polarized surface of PbTiO₃ microplates. The underlying mechanism of this ferroelectric polarization-driven selective growth was systematically investigated through combined theoretical simulations and experimental analyses. Furthermore, the charge transfer behavior within the heterostructure, the synergistic enhancement mechanism of the built-in electric field, and the photocatalytic Cr(VI) reduction performance along with influencing factors were comprehensively examined via DFT calculations and a series of characterization techniques. Zn 0.5 Cd 0.5 S/PbTiO 3 S-scheme heterojunction catalyst integrates three key aspects for boosting photocatalytic efficiency, including the increased solar spectrum response, the enhanced photogenerated charge separation, and the improved surface chemical reaction. As a result, it exhibits an optimal Cr(VI) reduction rate of 15.16 μmol·min⁻¹ ·g⁻¹ , which is 5.5 times higher than that of pristine PbTiO₃. This provides a new design and application of the synergistic and enhanced effect on ferroelectric-based artificial-photosynthesized heterojunction catalyst.
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Journal of Materials Chemistry C
·
2025
·
IF 5.1
Rui Ding,Wenjuan Zhang,Shiva Pandeya,Xueqing Zhu,Kai Xu,Meixing Gui,Hongbing Wang,Ziliang Li,Qianqian Shang,Mahesh Kumar Joshi
The design of a double Z-type heterojunction represents a promising strategy in photocatalysis to achieve superior charge carrier separation, increased light-harvesting capability, and consequently, a higher photocatalytic reaction rate. Herein, a novel ternary heterojunction with direct dual Z-scheme configuration, g-C3N4/In2S3/In2O3 photocatalyst, was synthesized using a chemical bath and facile calcination process. The XRD, SEM-EDS and XPS results confirmed the successful integration of g-C3N4, In2S3, and In2O3 with preserved crystalline phases. Photocatalytic performances of the ternary composite were evaluated via two effective routes, such as methyl orange (MO) degradation and hydrogen (H2) generation, benchmarked against the pristine g-C3N4 and the g-C3N4/In2S3 and In2S3/In2O3 binary composite, revealing that the in-situ growth of In2O3 onto the g-C3N4/In2S3 composite contributed to the remarkable enhancement of their photocatalytic activity. The photodegradation process follows the pseudo-first order reaction kinetics. The ternary g-C3N4/In2O3/In2S3 heterojunction exhibited 94.8% degradation efficiency of MO with a corresponding rate of 23.4×10-3 min-1, 4.8 times higher than the pristine g-C3N4, and excellent photocatalytic activity in five consecutive cycles. Similarly, the g-C3N4/In2S3/In2O3 heterojunction exhibited a rate constant of ~2.4 mmol h−1 g−1 for H2 generation. This superior enhancement was attributed to the dual Z-scheme charge transfer mechanism. The formation of direct dual Z-scheme heterojunction improved the light harvesting, minimized electron hole recombination, and efficiently facilitated the separation of charge carriers. This work provided a mechanistic insight for engineering multifunctional heterojunction for environmental remediation and pollutant mitigation.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2025
·
IF 9
Yuan Li,Sisi Pan,Hongyan Li,Ying Zhao,Jie Zhao,Ping Ning,Kai Li
The selective oxidation of H 2 S into elemental sulfur is considered as one promising method for the removal of this undesired gas. Second heterogeneous atom introducing into N doped carbocatalyst skeleton shows their potential on the enhancement of selectivity. We developed a novel N, S co-doped porous carbon with high pyridinic content and mesoporous pore structure for H 2 S selective oxidation. The experimental results showed that the optimized catalyst exhibits excellent durability about 133 h with 100 % conversion and 95 % elemental sulfur selectivity at 180 °C. Kinetic study and density functional theory calculation reveals that sulfur doping could regulate the electronic structure of N atom on the carbocatalyst surface and further weaken the interactions between N active site and H 2 S molecule, then prevent deep oxidation of H 2 S. The work provides a strategy for atomic-level modulation of non-metal doping catalysts, enabling selective oxidation process for efficient and durable desulfurization.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Yuhui Xie,Zipeng Xing,Xinyue Liu,Na Zhang,Zibin Wang,Zhenzi Li,Wei Zhou
S-scheme heterojunctions have garnered significant attention in the field of solar energy conversion, predominantly owing to their profound ability to facilitate charge carrier transfer and enhance photocatalytic activity. In this study, we introduce a novel hollow molybdenum dioxide containing oxygen vacancies@Nickel-Iron layered double hydroxide (MoO 2 -OV@NiFe-LDH) S-scheme heterostructure, designed to achieve effective charge separation and thereby enhance photothermal-photocatalytic performance. The photocatalytic hydrogen production efficiency under visible light is enhanced by a factor of 10.15 relative to pristine molybdenum dioxide (MoO 2 ). Additionally, the photocatalytic degradation efficiency for tetracycline is improved by 21.5 % compared to Nickel-Iron layered double hydroxide (NiFe-LDH). These enhancements are attributed to the S-scheme carrier transport pathways and a significant photothermal effect, as substantiated by diverse characterization tests and theoretical calculations. The S-scheme heterojunction promotes electron-hole separation, augments carrier transport, and enhances photo-oxidative reduction capabilities. This research presents an innovative approach for fabricating S-scheme heterojunctions with unique architectures that significantly improve photothermal and photocatalytic efficiencies.
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PubMed
高影响因子
Results in Chemistry
·
2025
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IF 4.2
Worku Lakew Kebede,Molla Tefera,Amogne Wondu,Melesse Ababay,Abrha Berhe,Mengistu Mulu,Atnafu Guadie
Water contamination caused by textile and industrial dyes is currently among the most important issues facing humanity that require urgent attention. Organic pollutants are harmful and can cause cancer in both humans and aquatic life. Even small amounts of these pollutants in water can lead to grave health problems. One promising way to clean up these pollutants is through degradation, using oxysulfide-based photocatalysts. These materials are effective because of their advanced optical and structural properties. The Sn-Mo(O,S) 3 catalysts were prepared through an easy precipitation process conducted at low temperatures. Different techniques were used to examine the catalyst's shape, structure, electrical properties, chemical makeup, and how it interacts with light. The Sn-Mo(O,S) 3 oxy-sulfide nanoparticle was successfully used to break down organic pollutants through photocatalytic processes. Among the samples made, the SMOS-25 catalyst showed the best performance in breaking down methylene blue dye. The effectiveness of the SMOS-25 catalyst was tested by seeing how well they could break down organic dye pollutant when exposed to visible light. The SMOS-25 nanoparticle was able to remove 98.9 % MB dye from water within 105 min under visible light. In this system, the main substance responsible for breaking down the dye is hydroxyl radical ( • OH).
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Aiting Xu,Xueliang Lu,Qiao Zhang,Guangxing Yang,Zhiting Liu,Siyuan Yang,Feng Peng
Constructing strongly coupled S-scheme heterojunctions without sacrificing redox capability remains a central challenge in photocatalytic water splitting. Herein, we report the in situ photogeneration of metallic Bi (Bi 0 ) nanobridges from layered Bi 2 O 2 CO 3 (BOC) under UV irradiation, which effectively wire BOC with TiO 2 (P25) to form a ternary BOC-Bi 0 -TiO 2 S-scheme heterojunction. Under ultraviolet-visible light or simulated sunlight, the optimized BOC-0.5P25 catalyst achieves a high H 2 evolution rate of ∼5.8 mmol·g −1 ·h −1 , which further increases by ∼24 % (to ∼7.2 mmol·g −1 ·h −1 ) after light-activated cycling. The apparent quantum efficiency (AQE) reaches 2.45 % at 380 nm. Structural characterizations confirm the light-induced formation of Bi 0 , accompanied by a slight chemical shift in Ti 2 p and Bi 4 f spectra, consistent with interfacial band bending. Band structure and kinetics analyses elucidate an S-scheme charge transfer mechanism where electrons preferentially flow via Bi 0 into TiO 2 while holes stay on Bi 2 O 2 CO 3 , driven by the built-in field. Isotopic labeling experiments via Gas Chromatography-Mass Spectrometry (GC–MS) isotopologues (CH x D 4-x in D 2 O/MeOH) together with online Differential Electrochemical Mass Spectrometry (DEMS) signals confirm that water contributes to both H 2 production and methanol oxidative reforming (partially to CH 4 ). The concept of light-triggered, in-situ mediator activation provides a practical route for photocatalytic water reduction coupled with methanol oxidative reforming under unbiased and noble-metal-free conditions through engineering tightly coupled S-scheme interfaces.
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PubMed
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ENERGY & FUELS
·
2025
·
IF 5.3
Yunyun Xie,Guanghua Liu,Zongwang Rao,Zhifang Xu,Jun Zhu,Chao Jiang,Yulong Yang,Zhiwen Hu,Qibing Chang
Fabricating an inexpensive and efficient electrocatalyst for the electrocatalytic oxygen evolution reaction (OER) in an alkaline medium is crucial for renewable energy generation. In this work, nickel foam (NF) modified with few-layer or single-layer MXene (S-MXene) was used as a substrate to prepare an independent, self-supporting composite electrode for oxygen evolution reaction (OER) catalysis. CoFe bimetallic MOF nanosheets were grown in situ on composite substrates by electrodeposition. Compared to multilayer MXene, S-MXene has a larger specific surface area and interlayer spacing, making it an ideal material for enhancing the conductivity of the electrode or serving as a supporting matrix. As an intermediate material, S-MXene can not only reduce the charge transfer resistance of the electrode and improve the active sites but also enhance the structural stability of the electrode, significantly improving the catalytic activity and long-term electrolysis stability of the electrode. The improved CoFe NSs@S-MXene/NF composite electrode delivers a current density of 10 mA cm–2 at a low overpotential value of only 191 mV in 1.0 M KOH, along with an ultralow Tafel slope of 31 mV dec–1. Additionally, the composite electrode exhibits outstanding stability for 24 h during OER at various current densities. This work innovatively uses S-MXene as a base material and develops a highly efficient new type of OER electrode. This novel strategy can serve as a reference for the modification of other electrode materials and expand the application of MXene in the field of water splitting.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Xiao Liu,Yanjun Zhang,Wuxia Zhang,Gang Cheng,Fan Tian,Wei Li,Jinyan Xiong
Solar-driven photocatalytic hydrogen production from water splitting holds significant potential in addressing the energy crisis and environmental pollution. However, rapid recombination of photogenerated carriers and insufficient surface catalytic reaction kinetics hinder the photocatalytic process. Constructing the catalytic systems with multi-channel charge-separation can effectively alleviate those issues. In this work, ternary PdO@TiO 2 -Cu 2 O composites have been synthesized through precursor calcination and low-temperature reduction, where PdO and Cu 2 O nanoparticles couple with the TiO 2 nanorods. Comparing to single TiO 2 , binary PdO@TiO 2 and TiO 2 -Cu 2 O, the PdO@TiO 2 -Cu 2 O hybrid exhibits enhanced photocatalytic hydrogen production performance (5831μmol g -1 h −1 ), with a hydrogen production rate more than three times that of single TiO 2 . Based on the band structures of TiO 2 and Cu 2 O, along with the photochemical/electrochemical, in-situ EPR, Photoluminescence (PL) tests, and work function calculations, the formation of an S-scheme heterojunction at the TiO 2 -Cu 2 O interface under light illumination facilitates the recombination of electrons in the conduction band (CB) of TiO 2 with holes in the valence band (VB) of Cu 2 O. In this regard, the established built-in electric field significantly accelerates the transfer of photogenerated charges while preserving their respective strong oxidation and reduction capabilities. Meanwhile, the introduction of PdO enriches the holes and further enhances the rate of charge separation. This S-scheme heterojunction with directional charge transfer and oxidation cocatalyst collectively form multi-channels of charge separation, optimizing charge migration and enabling efficient hydrogen production, thus improving the photocatalytic capability of pristine TiO 2 . This study provides a rational approach to construct efficient S-scheme heterojunction/oxidation cocatalyst multi-component catalytic systems for water splitting into hydrogen.
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JOURNAL OF BIOMATERIALS APPLICATIONS
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2015
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IF 2.197
Yan-Ling Luo,Yuan Wang,Xuan Wang,Feng Xu,Ya-Shao Chen
Tribrachia star-shaped random copolymers with tunable thermosensitive phase transition temperature were designed and synthesized via a simple one-pot ammonolysis reaction approach with trimesic acid as cores. The self-assembly micellization behavior of the copolymers in aqueous solution was examined by surface tension, UV–vis transmittance, transmission electron microscope, and dynamic light scattering measurements, etc. The results indicated that the resultant copolymers formed thermosensitive micelle aggregates through hydrophobic interactions among the isopropyl groups of poly(N-isopropylacrylamide) PNIPAM chains and inter-star association at a polymer concentration above critical aggregation concentrations from 4.06 to 6.55 mg L−1, with a cloud point range from 36.6℃ to 52.1℃, and homogeneously distributed micelle size below 200 nm. The arm length and the compositional ratios of the two comonomers had effect on physicochemical properties of the polymer micelle aggregates. Particularly, the cloud point values were enhanced as the (N,N-dimethylacrylamide) DMAM monomer was introduced and reached to 36.6℃ and 41.0℃–44.7℃ when the mass ratio of NIPAM to DMAM was 90:10 and 80:20, respectively. The thermo-triggered drug release and cytotoxicity were evaluated to confirm the applicability of the random copolymer micelle aggregates as novel drug targeted release carriers.
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JOURNAL OF SOILS AND SEDIMENTS
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2024
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IF 2.8
Yuan Zhao-Feng,Zhang Sha,Gustave Williamson,Ge Tida,Zhu Zhenke,Shi Xiaoyu,Tang Xianjin,Chen Zheng
Purpose Arsenic (As) and antimony (Sb) are toxic elements that usually co-occur in paddy soils due to their chemical similarity. Those elements are redox-sensitive and shift their species across the soil–water interface (SWI) where redox potentials change in every millimeter. In the real world, the distribution and speciation of As and Sb in soils are often influenced by external redox disturbance, but their temporospatial response remains poorly understood. This study aimed to address this gap by introducing external disturbance by adding nitrate into the overlying water. Methods Daily changes in the profile of As, Sb, iron (Fe), and sulfur (S) were measured using ICP-MS and the In-situ Porewater Iterative (IPI) sampler array. Results The results revealed a rapid formation of a sink for As and Fe at the oxic-anoxic transition zone within one day, persisting for at least 6 days and extending to ~ 30 mm below the SWI. Moreover, Sb was re-mobilized in the same area as the As and Fe sink, but the re-mobilized Sb zone was weaker, lasting only 4 days and extending to ~ 20 mm below the SWI. The presence of aqueous ferrous Fe below the transition zone facilitated the formation of Fe and As sink, while the presence of aqueous sulfide below the transition zone hindered the development of the Sb source. Conclusion These findings highlight the importance of carefully evaluating the impact of nitrate-based fertilizers or stabilization reagents when applied in As and Sb contaminated soils.
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JOURNAL OF ELECTRONIC MATERIALS
·
2021
·Vol. 50
·期 11
·6237-6244
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IF 1.938
Zhao Guixiang,Meng Yanshuang,Zhang Hongshuai,Duan Mingtao,Zhu Fuliang
The development of lithium–sulfur batteries is limited due to its notorious "shuttle effect". Heteroatoms are introduced to the host materials to absorb the polysulfides and further to alleviate the shuttle effect. Herein, porous carbon (NSPC) was successfully prepared by template method and used as sulfur host material. The results show that NSPC has a high specific surface area (697.19 m 2 g −1 ) and abundant heteroatom doping, which helps to enhance the capture and absorption of polysulfides. The prepared S@NSPC was loaded with 76% sulfur, and the composite electrode displayed excellent cycle stability because of its strong polysulfide absorption. The S@NSPC composite electrode shows high initial specific capacity of 741.8 mAh g −1 at 167.5 mA g −1 , the capacity of the S@NSPC composite electrode remained 609.8 mAh g −1 after 500 cycles, and the attenuation per cycle was only 0.027%, showing good stability.
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CHINESE JOURNAL OF POLYMER SCIENCE
·
2022
·Vol. 40
·期 7
·754-763
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IF 3.815
Chen Xing,Xiao Lei,Qiu Xin-Sheng,Chen Kang-Cheng
A series of multiblock sulfonated poly(arylene ether sulfone)s (SPAES) with various block lengths and predictable ion exchange capacity were synthesized from 4,4′-difluorodiphenyl sulfone, 4,4′-dihydrodiphenyl sulfone and 4,4′-biphenol by one-pot and two-pot polymerization. 1 H-NMR and FTIR spectra confirmed the structure that sulfonic acid groups were introduced precisely on the poly(arylene ether sulfone)s by post-sulfonation which resulted in controllable sulfonation degree. The proton exchange membranes (PEMs)-based SPAES displayed excellent dimensional, thermal, antioxidant stability, proton conductivity and mechanical properties (maximum tensile stress >35 MPa). Thermogravimetric analysis indicated the prepared SPAES began to degrade above 310 °C. The effects of polymerization processes, those were, one-pot hydrophobic segment process, one-pot hydrophilic segment process and two-pot process, on the properties of polymers were investigated. The proton conductivity and microphase separation of SPAES PEMs increased in order of those prepared by one-pot hydrophobic segment process, two-pot process and one-pot hydrophilic segment process. The highest conductivities of SPAES synthesized by the above processes under 80 °C and 100% relative humidity were 213 (MS4), 297 (MB3) and 360 mS·cm −1 (MQ2), respectively.
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