APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Jun Feng,Tao Jiang,Yingchun Han,Otieno Kevin Okoth,Ling Cheng,Jingdong Zhang
A dual Z-scheme Bi 2 S 3 /Bi 2 O 3 /WO 3 ternary film was constructed via a controllable reduction of peroxotungstate by ethanol, calcination of Bi (NO 3 ) 3 and in situ anion exchange of Bi 2 O 3 with sulfide. The as-prepared composite film was characterized by scanning electron microscopy, X-ray diffraction and X-ray photoelectron spectroscopy. The UV–visible diffuse reflectance spectroscopic and photoluminescence studies indicated that the introduction of Bi 2 S 3 in Bi 2 O 3 /WO 3 film effectively improved the absorption of the film in the visible region and suppressed the recombination of photogenerated carriers. The photoelectrocatalytic activity of the Bi 2 S 3 /Bi 2 O 3 /WO 3 film was evaluated by decoloration of Rhodamine B under visible light illumination. Compared with WO 3 and Bi 2 O 3 /WO 3 films, the Bi 2 S 3 /Bi 2 O 3 /WO 3 film exhibited much higher degradation efficiency. Moreover, the enhanced visible light photoelectrocatalytic activity of the Bi 2 S 3 /Bi 2 O 3 /WO 3 film was also demonstrated by efficient degradation of diclofenac. According to the reactive oxygen species detected by electron spin resonance, a dual Z-scheme system formed in the Bi 2 S 3 /Bi 2 O 3 /WO 3 film was proposed, which offered a new approach to the construction of semiconducting composite film with high photoelectrocatalytic performance for pollutant removal.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2019
·
IF 14.229
Sicong Wang,Zhenyuan Teng,Yanqi Xu,Meng Yuan,Yunhao Zhong,Sixiao Liu,Chengyin Wang,Guoxiu Wang,Teruhisa Ohno
In designing of carbon nitride-based Z-scheme systems, band structure engineering of graphitic carbon nitride (g-C 3 N 4 ) is unquestionably a crucial demand but paid rare attention to. Here, the broadened light absorption and charge transfer on sub gaps induced by thermal defects in defect-rich carbon nitride (d-C 3 N 4 ) are simultaneously utilized to engineer a novel and more efficient Z-scheme system. The as-prepared α-Fe 2 O 3 /d-C 3 N 4 -1 exhibits dramatically improved photocatalytic degradation rate for tetracycline compared withα-Fe 2 O 3 /g-C 3 N 4 -1 under visible light. Dye photosensitization effect on photocatalytic reaction was ruled out, and the tetracycline decomposition mechanism was proposed. The efficiently restrained charge recombination and broadened light absorption in this Z-scheme system are key parameters of the outstanding photocatalytic activity. This proposed mechanism has the potential to push the limit of traditional carbon-nitride-based Z-scheme photocatalysts and can also shed substantial light on the engineering strategies for other polymeric Z-scheme photocatalysts.
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JOURNAL OF POWER SOURCES
·
2016
·
IF 6.333
Junhua Hu,Lijie Wang,Peng Zhang,Changhao Liang,Guosheng Shao
Carbon-layer-coated TiO 2 /WO 3 nanofibers (WTC) were fabricated by combining the electrospinning technique (for TiO 2 /WO 3 nanofibers) and hydrothermal method (for carbon shell). The structure characterization results showed that TiO 2 /WO 3 nanofibers (WT) were encased within an uniform carbon shell about 10 nm in thickness. By adjusting the content of WO 3 , the graphitization degree of carbon layer could be controlled, and the WTC nanofibers had remarkable light absorption in the visible region. Furthermore, the photoelectrochemical performance and photocatalytic activity were investigated systematically. As expected, the H 2 -generation rate of the as-prepared composite materials was greatly enhanced compared with pure TiO 2 nanofibers (TNFs), TiO 2 /WO 3 nanofibers (WT) and TiO 2 @carbon core/shell nanofibers (TC). The enhanced activities were mainly attributed to the multichannel-improved charge-carrier photosynthetic heterojunction system with the carbon layer on the surface of TiO 2 as an electron collector and WO 3 as a hole collector, leading to effective charge separation on these components, which were evidenced by photoluminescence spectroscopy (PL), electrochemical impedance spectroscopy (EIS) and photocurrent analysis. Besides, the addition of WO 3 promoted the graphitization of carbon layer, which in turn improved transport of electrons in the carbon layer and also contributed to the performance improvement.
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JOURNAL OF PHYSICS D-APPLIED PHYSICS
·
2022
·Vol. 55
·期 43
·434005
·
IF 3.409
Yang Li,Yue Lu,Xiaofang Jia,Zhaoyu Ma,Junying Zhang
Graphitic carbon nitride (g-C3N4) is a photocatalytic semiconductor with great potential for application, whereas, its photocatalytic activity is limited by the high re-combination rate of photo-generated electrons and holes. Here, we load two-dimensional (2D) WO3 nanosheets on the surface of one-dimensional (1D) g-C3N4 porous nanotubes to form a Z-scheme heterojunction. The built-in electric field at the interface of the heterojunction is conducive to promoting electrons transfer from the conduction band of WO3 to the valence band of g-C3N4 and therein combine with the holes. This inhibits electron–hole re-combination in g-C3N4 and WO3, and thus retains the high redox potential of the photo-generated charge-carriers. Therefore, the 2D/1D WO3/g-C3N4 heterojunction shows excellent photocatalytic hydrogen production and Rhodamine B degradation activities. Under simulated sunlight, photocatalytic hydrogen production rate of the WO3/g-C3N4 heterojunction reaches 7.78 mmol g−1 h−1, 2.7 times that of the single g-C3N4 porous nanotubes.
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ACS Physical Chemistry Au
·
2022
·
IF 0
Feng-Kang Shang,Ming-Yu Qi,Chang-Long Tan,Zi-Rong Tang,Yi-Jun Xu
Simultaneously utilizing photogenerated electrons and holes in one photocatalytic system to synthesize value-added chemicals and clean hydrogen (H2) energy meets the development requirements of green chemistry. Herein, we report a binary material of CdS/BiVO4 combining one-dimensional (1D) CdS nanorods (NRs) with two-dimensional (2D) BiVO4 nanosheets (NSs) constructed through a facile electrostatic self-assembly procedure for the selectively photocatalytic oxidation of aromatic alcohols integrated with H2 production, which exhibits significantly enhanced photocatalytic performance. Within 2 h, the conversion of aromatic alcohols over CdS/BiVO4-25 was approximately 9-fold and 40-fold higher than that over pure CdS and BiVO4, respectively. The remarkably improved photoactivity of CdS/BiVO4 hybrids is mainly ascribed to the Z-scheme charge separation mechanism in the 1D/2D heterostructure derived from the interface contact between CdS and BiVO4, which not only facilitates the separation and transfer of charge carriers, but also maintains the strong reducibility of photogenerated electrons and strong oxidizability of photogenerated holes. It is anticipated that this work will further stimulate interest in the rational design of 1D/2D Z-scheme heterostructure photocatalysts for the selective fine chemical synthesis integrated with H2 evolution.
研究领域:
材料科学
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化学工程
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纳米技术
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ChemCatChem
·
2024
·Vol. 17
·期 3
·e202401364
·
IF 3.8
Haixia Li,Dan Li,Chuanqiang Yin,Feigao Xu
Graphical FeP/CdS Z-type heterojunction photocatalysts were successfully prepared by a facile hydrothermal method. Experimental results demonstrated that FeP/CdS composite photocatalysts have excellent performance in the catalytic degradation of TCH with the help of activated H 2 O 2 .The construction of Z-type heterostructures provided an effective photogenerated electron transfer channel, which facilitated its separation and utilization as well as accelerated the cycling of Fe 3+ /Fe 2+ . Photocatalysis is an efficient technology for the degradation of pollutants. However, it still needs to be improved. In this study, magnetic Z-scheme FeP/CdS composites heterojunction photocatalysts were prepared by a facile hydrothermal method, and the structure, morphology, optical, and photocatalytic properties of the prepared composites were investigated in detail. The efficiency of tetracycline hydrochloride (TCH) removal by FeP/CdS composites was investigated under different reaction conditions (including different FeP and CdS ratios, catalyst dosage, hydrogen peroxide consumption, temperature, and initial pH). FeP/CdS composites exhibited better catalytic performance compared with pure components. The F 1 Cd 1 composite (mass ratio of FeP to CdS is 1:1) achieved 92.7% removal efficiency of TCH; moreover, the F 1 Cd 1 composite still exhibits a high stability after five consecutive cycles. The capture experiments on the active material showed that the removal of TCH by the F 1 Cd 1 composite was mainly dominated by •OH; however, •O 2 − , e − , and h + played a minor role, and the degradation mechanism was revealed by combining various characterization techniques. The introduction of cadmium sulfide formed an effective photogenerated carrier transport channel at the interface with the iron phosphide surface, which could accelerate the transfer and separation of photo-excited e − /h + pairs, thus improving the degradation performance of TCH.
研究领域:
环境科学
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材料科学
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2026
·
IF 5.4
Yingying Qian,Jianhai Wang,Yuesong Shen
Heterojunction engineering has garnered significant attention in photocatalysis as an effective strategy to address the rapid carrier recombination dynamics in semiconductor photocatalysts. The core challenge in constructing high-performance heterojunction systems lies in establishing optimized interfacial connections to achieve directional charge carrier migration. This study proposed a temperature-regulated band engineering strategy, through precise control of Ni-MOFs growth temperature and integration with WO 3-x possessing exceptional photothermal conversion capacity, to successfully construct an efficient Z-scheme heterojunction system. When the synthesis temperature of the Ni-MOF reached 140 °C, its conduction band negatively shifted to −1.2 eV (vs. NHE), resulting in a well-matched Z-scheme heterojunction with WO 3-x . The optimized 140-Ni-MOF/WO 3-x heterojunction demonstrated remarkable enhancement in charge separation efficiency while preserving strong redox capabilities through the Z-scheme charge transfer pathway. Under mild gas-solid reaction conditions (H 2 O as electron donor), the optimized catalyst exhibited excellent CO 2 reduction performance, achieving a CO production rate of 111.17 μmol·g −1 with 96.92 % selectivity. The temperature-depended modulation strategy for MOF electronic band structure proposed in this study paved the way for constructing efficient MOF-based photocatalysts.
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GREEN CHEMISTRY
·
2020
·Vol. 22
·期 21
·7552-7559
·
IF 9.48
Bing-Cai He,Chao Zhang,Pei-Pei Luo,Yu Li,Tong-Bu Lu
Photocatalytic CO2 reduction coupled with water oxidation provides a fascinating approach to mitigating the issues of global warming and energy shortage. Herein, a direct Z-scheme heterojunction of Co1-C3N4@α-Fe2O3 comprising a g-C3N4-supported single-atomic Co site catalyst (denoted as Co1-C3N4) and α-Fe2O3 nanorod arrays is fabricated for efficient CO2 reduction. A CO production rate of 14.9 μmol g−1 h−1 with a high CO selectivity (>99%) is achieved under visible-light irradiation without any sacrificial agents other than water. Time-resolved photoluminescence (TRPL) analysis reveals that both the Z-scheme mechanism and the single-atomic Co sites contribute to the prolonged lifetime of the photo-induced excitons. Moreover, the formation of the Z-scheme heterojunction would lead to an altered charge density of the single-atomic Co sites. In situ diffuse reflectance infrared Fourier-transform spectroscopy and anion adsorption measurements reveal that the key intermediate CO2− could be efficiently stabilized by the positively charged Co sites in Co1-C3N4@α-Fe2O3, thus enhancing the CO2 reduction performance. This work offers a new direction for the rational design of single-atomic site catalysts in artificial photosynthesis.
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INORGANIC CHEMISTRY COMMUNICATIONS
·
2026
·
IF 5.4
Qinzheng Wei,Sze-Mun Lam,Jin-Chung Sin,Huanming Liu,Jinpeng Su,Kun Dong,Haixiang Li
Multifunctional catalyst surfaces for organic photodegradation and antibacterial applications are generally in high requirements, but they are facing towering challenges in light harnessing capability and charge transfer. In this work, a plate-like Bi 2 MoO 6 loaded onto prism-like ZnO (BZ) composite was devised via a two-step precipitation-solvothermal technique to surmount above lapses. Comprehensive material characterization using XRD, FESEM, TEM, XPS, FTIR, UV–vis DRS, PL and photoelectrochemical measurements witnessed successful material compounding and crucial structural as well as distinct electrochemical traits. When fed with enrofloxacin (ENR) as a targeted aquaculture pollutant, the BZ composite exhibited high photodegradation activity (98.2%) under solar light, which was 1.4 and 2.6 times those of individual Bi 2 MoO 6 and ZnO after 180 min solar irradiation, respectively. Moreover, the BZ composite efficiently realized photocatalytic inactivation of Escherichia coli and Staphylococcus aureus under solar light irradiation. The bacterial colony completely inactivated after introducing the binary composite within 180 min. The remarkable enhancement was due to both incorporation of abundant site Bi 2 MoO 6 and the formation of BZ Z -scheme system which better improved light capturing behaviour and afforded the effective charge segregation for the incremented reactive oxygen species yield (e.g. superoxide anion radical and photogenerated hole). Additionally, LC-MS and T.E.S.T outcomes further validated the efficient ENR photodegradation and a substantial reduction in the toxicity of intermediate products. The relatively convenient repeatability trait and eminent photoactivity performance of BZ were favorable for actual wastewater treatment and bacterial disinfection applications.
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OPTICAL MATERIALS
·
2026
·
IF 4.3
Ranran Zhang,Pengfei Zhu,Xuemei Chen,Yunhui Jiang
Antibiotic contamination in aquatic environments has become an increasingly serious issue, creating an urgent need for efficient and environmentally friendly remediation technologies. Herein, a Bi 0 -BiVO 4 /PPy composite photocatalyst was prepared through a combined hydrothermal, in situ reduction, and oxidative polymerization strategy for visible-light-driven tetracycline (TC) removal. Under optimized reaction conditions, Bi 0 -BiVO 4 /PPy-3 achieved 85.4% TC removal within 60 min and exhibited a significantly improved reaction rate compared with pristine BiVO 4 . The composite also showed good recyclability after regeneration, satisfactory salt tolerance, and stable activity in different water matrices. Moreover, a preliminary wheat-growth assay suggested that the treated solution had lower phytotoxicity than the original TC solution. The enhanced photocatalytic activity is associated with the synergistic effects of Bi 0 introduction and PPy coupling, including improved visible-light absorption and more efficient interfacial charge separation. THz Time-Domain Spectroscopy (THz-TDS) further revealed enhanced terahertz absorption and a modulated refractive response in Bi 0 -BiVO 4 /PPy-3, providing additional evidence for strengthened interfacial coupling and charge transport. Radical trapping experiments and EPR analysis indicate that h + and •O 2 − are the dominant reactive species in the TC degradation process. Based on the available experimental and DFT calculations, a possible Z-scheme like charge transfer pathway and several tentative degradation routes of TC were proposed. Overall, this work suggests that Bi 0 -BiVO 4 /PPy is a promising visible-light-responsive photocatalyst for antibiotic removal from water.
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APPLIED CATALYSIS A-GENERAL
·
2026
·
IF 4.8
Linke Zhao,Yang Li,Lili Li,Gongke Wang,Hairui Liu,Hongjing Li,Arif Nawaz,Haifa Zhai
A Z-scheme CIS/rGO/p-CN heterostructure was designed. • CIS/rGO/p-CN exhibits the highest visible-light activity for Cr(VI) photoreduction. • rGO serves as the solid-state electron mediator to switch the charge transfer mode. Hexavalent chromium (Cr (VI)), a highly toxic metal ion readily soluble in aqueous environments, poses significant threats to human health. Herein, a novel Z-scheme CuInS 2 /rGO/protonated g-C 3 N 4 heterostructure was designed with rGO serving as the solid-state electron mediator between CuInS 2 and protonated C 3 N 4 . The samples were systematically characterized using XRD, FTIR, SEM, TEM, XPS, PL, and UV–vis spectroscopy techniques. This flower-like hierarchical structure CuInS 2 /rGO/protonated g-C 3 N 4 exhibits enhanced visible-light photocatalytic activity for Cr (VI) photoreduction. Specifically, it demonstrates a 98% reductive efficiency for Cr (VI) within 20 min at pH= 4 and stable photocatalytic performance. The results indicate that the integration of rGO nanosheets significantly enhances the photocatalytic performance of the CuInS 2 /rGO/protonated g-C 3 N 4 heterostructure by weakening the built-in electric field between CuInS 2 and protonated C 3 N 4 and switching the charge transfer mode from a conventional p-n junction to a Z-scheme mechanism. Download: Download high-res image (103KB) Download: Download full-size image
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ADVANCED SYNTHESIS & CATALYSIS
·
2026
·Vol. 368
·期 9
·e70446
·
IF 3.7
Dingbin Zhu,Yue Wang,Fuxiu Cao,Wanjun Xu,Wenlong Jia,Huai Liu,Rui Zhang,Lincai Peng,Tianping Lv,Tianwei He,Junhua Zhang
The photocatalytic conversion of biomass-derived monosaccharides to lactic acid (LA) provides a sustainable approach for the high-value utilization of biomass. However, conventional photocatalysts suffer from insufficient visible light absorption, rapid recombination of photogenerated charge carriers, and inadequate surface active sites, which severely hinder the generation of key active species, thereby limiting the catalytic activity and LA selectivity. Herein, this study constructs a Z-scheme heterojunction photocatalyst TiO 2 /C-CN by combining carbon skeleton and oxygen vacancy (V O )–modified TiO 2 with graphitic carbon nitride (CN), with excellent photocatalytic performance. Under visible light irradiation, it achieves 92.3% LA yield and 96.4% selectivity within 60 min. The carbon skeleton effectively enhances visible light absorption and electron transport, V O provides abundant active sites for the adsorption and activation of oxygen, and the construction of the Z-scheme heterojunction achieves efficient charge separation while retaining strong redox capability. The synergistic effect of these three components facilitates the efficient generation of superoxide radicals ( ), which selectively cleave the C3 C4 bond of glucose intermediates, directing the reaction toward LA formation. This study provides a rational strategy to design efficient and precise photocatalysts for biomass valorization through the synergistic regulation of electron transport channels, defect sites, and heterojunction engineering.
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