JOURNAL OF ALLOYS AND COMPOUNDS
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2023
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IF 6.2
Fangfang Duo,Mingliang Zhang,Xiaoting Feng,Chubei Wang,Liangliang Chu,Xi Chen,Jianwei Zhou
Constructing Z-scheme heterojunction has been regarded as a fascinating method to enhance the charge carrier separation rate and retain the high photoredox ability. In this paper, a novel 0D/2D MoS 2 QDs/BiOCl Z-scheme heterojunction with outstanding visible-light photocatalytic performance has been successfully prepared by a facile one-step strategy. The MoS 2 QDs with a diameter of 5 nm were uniformly distributed on the surface of BiOCl nanosheets . The optimized MoS 2 QDs/BiOCl heterojunction showed the most robust CIP and RhB degradation efficiency, which was approximately 32.2 and 44.7 times higher than that of pure BiOCl under visible light irradiation, respectively. This result can be attributed to the synergetic effects of up-conversion and direct Z-scheme heterojunction of the MoS 2 QDs. The optical property , morphology and surface feature of the catalyst were analyzed through the UV–vis DRS, PL , XRD , Raman, FT-IR, XPS, SEM and TEM. The study of ESR characterization and free radical capture experiments confirmed the Z-scheme heterojunction electron transfer route. Finally, a rational photocatalytic mechanism for pollutants degradation over the MoS 2 QDs/BiOCl heterojunctions were proposed. This study may provide a reliable strategy for the construction of Z-scheme bismuth-based heterojunction and its potential application in photocatalytic organic pollutants degradation.
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CHEMOSPHERE
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2023
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IF 8.8
Kai Wang,Xiaojiao Yu,Zongbin Liu,Ting Zhang,Yao Ma,Jinfen Niu,Binhua Yao
Constructed heterojunction has been considered an efficient strategy to enhance the migration and transfer of photoinduced charge carriers. Herein, a Z-scheme Cu 2 O/BiOBr heterojunction with 0D/2D structure was fabricated by microwave hydrothermal method. It was found that the optimal composites photocatalyst showed excellent activity for sulfamethoxazole (SMZ) illumination, and the removal rate reached 90.7%, which was higher than pristine Cu 2 O (53.0%) and BiOBr (60.0%). Subsequently, the operational parameters such as catalyst dosage, concentrations of pollutants, and pH of solution were investigated. According to the ultraviolet–visible diffuse reflectance spectroscopy (UV–Vis DRs), Mott-Schottky curve, and density functional theory (DFT) analysis, the Z-scheme degradation mechanism of Cu 2 O/BiOBr heterostructure was proposed. Among them, the interface structure of 0-dimensions/2-dimensions (0D/2D) can significantly increase the number of heterojunctions in the composite catalyst, and Z-scheme heterostructures can accelerate the generation and migration of photoinduced charge carriers, which has a facilitation effect on improving the decomposition activity of the photocatalyst. Moreover, three possible pathways for SMZ degradation were inferred. This study provides a promising strategy for constructing novel heterojunctions with high photocatalytic performance.
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CHEMICAL ENGINEERING JOURNAL
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2020
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IF 10.652
Chunquan Li,Xiongbo Dong,Ningyuan Zhu,Xiangwei Zhang,Shanshan Yang,Zhiming Sun,Yangyu Liu,Shuilin Zheng,Dionysios D. Dionysiou
In this work, kaolinite supported monodispersed TiO 2 with carbon regulation was prepared through rational design and different dimensions’ assembly, leading to generation of Ti III species in carbon doped TiO 2 /kaolinite (C-TiO 2 /kaolinite) composite. The C-TiO 2 /kaolinite composite exhibited improved degradation performance towards ciprofloxacin under visible light, with a reaction rate constant of 0.00597 min −1 , which is about 3.24 and 24.88 times higher than that of 2.0C-T (2.0% carbon-doped TiO 2 ) and pure TiO 2 , respectively. Based on various materials characterization methods and DFT calculations, it was indicated that the electronic structure was correlated with the changes in light absorption, charge carrier lifetime, and reactive oxygen species (ROS). The enhanced visible light responding ability could be attributed to the synergistic effect between natural kaolinite and nanosized TiO 2 , the formation of localized occupied states in the gap, and the formation of Ti III defects consisted of surface oxygen vacancies. All of them effectively increase the separation efficiency, migration velocity, and lifetime of the photoinduced charge carriers under visible-light irradiation. Overall, our study provides a promising candidate for effective degradation of trace amounts of pharmaceutical and personal care products and other highly toxic contaminants with the assistance of solar light.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2021
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IF 8.128
Ziyi You,Xiaoyang Yue,Dainan Zhang,Jiajie Fan,Quanjun Xiang
In recent years, the use of quantum dots (QDs) cocatalysts to improve the hydrogen evolution activity from the water splitting of photocatalysts has become a popular research topic. Herein, we successfully prepared a novel 0 dimension/2 dimension (0D/2D) heterojunction nanocomposite (denoted Ag 2 S quantum dots (QDs)/g-C 3 N 4 ) with excellent photocatalytic performance by anchoring the Ag 2 S QDs cocatalyst on the surface of g-C 3 N 4 through a self-assembly strategy. Ag 2 S QDs with an average particle size of approximately 5.8 nm were uniformly and tightly modified on g-C 3 N 4 . The Ag 2 S QDs/g-C 3 N 4 composite with 0.5 wt% Ag 2 S QDs loading achieved the highest hydrogen evolution rate of 471.1 μmol·g −1 ·h −1 with an apparent quantum efficiency (AQE) of 1.48% at 405 nm. Such remarkable hydrogen evolution activity far exceeded that of undoped g-C 3 N 4 and Ag 2 S nanoparticles (NPs)/g-C 3 N 4 . Moreover, it was 2.04 times the activity of Pt/g-C 3 N 4 with Pt as the cocatalyst. The enhanced photocatalytic performance was attributed to the energy band broadening of Ag 2 S QDs caused by the quantum size effect and the convenient and effective charge transfer between g-C 3 N 4 and Ag 2 S QDs cocatalysts. The mechanism underlying the enhanced photocatalytic H 2 evolution activity was further proposed. This study demonstrates that semiconductor-based quantum dots are strong candidates for excellent cocatalysts in photocatalysis.
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Journal of Water Process Engineering
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2025
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IF 6.7
Qingsong Hu,Yanbing Liu,Meng Ye,Ting Zhou,Mingyang Li,Wei Jiangs,Binxian Gu
Photocatalytic technology has been widely concerned because of its characteristics of simple operation, low energy consumption and no secondary pollution. In this work, tea biomass carbon quantum dots (T-BCDs) modified PbBiO 2 Cl nanosheets have been prepared via ionic liquid assisted solvothermal method. Firstly, various characterization techniques were employed to study the morphology and structure of the catalysts. Subsequently, we evaluated the photocatalytic activities of the acquired catalysts on account of degradation of ciprofloxacin (CIP) under visible and near-infrared light. The experimental results show that the photocatalytic activity of nanocomposites is obviously improved. Among which, 3 mL T-BCDs/PbBiO 2 Cl displays the strongest photocatalytic performance. In addition, the reasons for the enhancement of photocatalytic activities were explored by photoelectrochemical characterizations. T-BCDs can be used as electron acceptors, which can effectively boost the charge transfer and inhibit the recombination of photogenerated carriers. Finally, the photocatalytic mechanism was elucidated through free radical trapping experiments, electron spin resonance (ESR) technology and band structure analysis. Superoxide radical (•O 2 − ), hydroxyl radical (•OH) and holes (h + ) are the main active substances involved in antibiotic degradation. This research aims to develop high-performance photocatalysts that contribute to environmental remediation.
研究领域:
环境科学
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材料科学
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纳米技术
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催化
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光化学
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SENSORS AND ACTUATORS B-CHEMICAL
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2020
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IF 7.1
Fenghe Duan,Chuanpan Guo,Mengyao Hu,Yingpan Song,Minghua Wang,Linghao He,Zhihong Zhang,Riccardo Pettinari,Liming Zhou
A promising nanocarrier of the complementary DNA (cDNA) toward miRNA-155 was synthesized on the basis of the nanohybrid type of Ti 3 C 2 T x MXene nanosheets decorated using iron phthalocyanine quantum dots (FePc QDs) (denoted as Ti 3 C 2 T x @FePcQDs) to construct a novel ultrasensitive impedimetric aptasensing system for microRNA-155 (miRNA-155). Owing to π–π* stacking interaction between Ti 3 C 2 T x nanosheets and FePc QDs, the homogeneous nanostructure of the Ti 3 C 2 T x @FePcQD nanohybrid that comprises mixed-valence states (Ti 2+ /Ti 3+ and Fe 2+ /Fe 3+ ), multicomponent (Ti-O and Ti-C), and various N-related groups was achieved. The constructed Ti 3 C 2 T x @FePcQDs-based aptasensor displayed an ultrahigh sensitivity for detecting miRNA-155 with a low detection limit of 4.3 aM (S/N = 3) within the miRNA-155 concentration ranging from 0.01 fM to 10 pM. Compared with the individual component-based aptasensors and other reported miRNA-155 aptasensors, the proposed impedimetric aptasensing system exhibited substantial merits of a feasible preparation process, non-use of labels or electrochemical indicators, fast response time, and comprehensive sensing performances for detecting miRNA-155. This strategy for determining miRNAs can extensively be applied as the platform for anchoring other kinds of aptamers in detecting diverse targets, thus indicating its great potential application for the early diagnosis of cancer biomarkers.
研究领域:
纳米技术
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生物传感器
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分析化学
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分子生物学
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癌症研究
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2020
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IF 7.489
Ting Song,Linquan Hou,Bei Long,Atif Ali,Guo-Jun Deng
The fabrication of ultrathin MXene (Ti 3 C 2 )-based photocatalysts is highly intriguing as the charges can vectorially transfer along the two-dimensional (2D) direction despite being challenging. Herein, ultrathin Ti 3 C 2 (TiC) nanosheets with excellent conductivity are rationally introduced to ultrathin metal-free 0D/2D black phosphorus (BQ)/ultrathin g-C 3 N 4 (UCN) heterojunction for improving photocatalytic H 2 production activity. The optimized BQ/TiC/UCN composite displayed obvious advantages such as the strong interfacial contact and enhanced visible-light capture. Importantly, the incorporation of TiC nanosheets substantially accelerates charge transfer to fast separation of photoinduced carriers between BQ and UCN . The optimized BQ/TiC/UCN composite exhibited 47.2 and 19.4 folds higher photocatalytic activity (18.42 mmol h −1 g −1 ) than that of bulk g-C 3 N 4 (BCN) and UCN, respectively. The microstructure, composition, and optical properties of BQ/TiC/UCN composite were carefully characterized. The current research results may furnish fresh insights into the exploration of MXene (Ti 3 C 2 )-based catalysts with high solar energy utilization.
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CHEMICAL ENGINEERING JOURNAL
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2020
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IF 10.652
Junyu Fan,Meimei Zuo,Zhaoxia Ding,Zhiwei Zhao,Jie Liu,Bo Sun
A promising and practicable catalyst is the key challenge for industrial perspective to promote photocatalytic nitrogen fixation. In this study, a new 0D /2D heterojunction, oxygen vacancy-induced In(OH) 3 /carbon nitride (OV-In(OH) 3 /CN), was synthesized by generating In(OH) 3 nanoparticles on g-C 3 N 4 nanosheets in the presence of glyoxal through a facile and readily precipitation growth method at 60℃and under atmospheric pressure. The existence of oxygen vacancies, structure, morphology and optical-electronic properties of the composite were characterized by HRTEM, XPS and EPR analysis and other measurements. The OV-In(OH) 3 /CN heterojunction exhibited excellent photocatalytic activity for nitrogen fixation with a good chemical stability. The OV-In/CN-3 sample reached the maximum NH 3 generation rate to be 3.81 mM*h −1 *g −1 , which was about 10 times as that of pure g-C 3 N 4 and was also higher than that of other catalysts reported. Though the In(OH) 3 in heterojunction was demonstrated incapable of producing photogenerated electrons under vis-light irradiation, its oxygen vacancy was found to “receive” and “trap” some excited electrons from g-C 3 N 4 , promoting electron-hole pairs separation efficiency and prolonging the lifetime of carriers. And it also can introduce many chemisorption sites for N 2 . Those are the two key reasons for its high photocatalytic activity.
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JOURNAL OF HAZARDOUS MATERIALS
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2026
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IF 11.3
Dehua Wang,Qixi Duan,Hai Sun,Jiahao Li,Zhenyu Zhu,Zhaolong Fang,Yanxing Yang,Yong Yang
MXene-based materials have received increasing attention in gas sensing due to their excellent electrical conductivity and favorable surface properties. However, their practical applications are severely limited by low sensitivity, limited selectivity and poor stability. In this study, a robust sandwich-like 2D/0D/2D MXene@TiO 2 /ZnIn 2 S 4 ternary integrated heterojunction is designed and constructed. The architecture effectively promotes charge transfer across multiple heterointerfaces (metal/semiconductor interface, semiconductor/semiconductor interface), enabling highly sensitive and selective detection of volatile organic compounds, particularly triethylamine. The MXene@TiO 2 /ZnIn 2 S 4 ternary integrated heterojunction exhibits a high response value of ∼48 (R a /R g ) toward 100 ppm triethylamine at 300 °C, along with excellent selectivity, fast response/recovery, low limit of detection (697.2 ppb), remarkable humidity tolerance and long-term stability over 110 days. It is found the efficient multi-interface charge transport channel and enhanced gas adsorption/oxidation characteristics of the MXene@TiO 2 /ZnIn 2 S 4 ternary integrated heterojunction contribute to the excellent gas sensing performance. Moreover, the construction of sandwich-like 2D/0D/2D hierarchical open structure not only greatly promotes the diffusion of gas molecules, but also enhances the stability of pristine MXene. This work not only offers a novel strategy to enhance the performance of MXene-based gas sensing materials, but also provides significant insight into charge transport mechanisms at muti-interfaces in resistive-type gas sensors.
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Scientific Reports
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2026
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IF 4.9
Luo Yan,Cheng Fangfang,Han Lin,Sun Zhiwang,Wang Yingxu,Zhong Hong,Wang Shifeng
Industrial wastewater causes serious water pollution, so it is urgent to remove toxic dyes like malachite green (MG). In this study, a 0D/2D S-scheme heterojunction was constructed by anchoring CeO 2 nanocubes onto SnSe 2 hexagonal nanosheets via a precisely controlled two-step hydrothermal strategy. In-situ electron paramagnetic resonance (EPR) analysis corroborates that illumination triggers the proliferation of surface oxygen vacancies. These photo-induced oxygen vacancies (OVs, oxygen vacancies) empower the CeO 2 /SnSe 2 heterostructure to sustain exceptional catalytic activity over five consecutive cycles. Moreover, the optimized 0.2 g CeO 2 /SnSe 2 composite exhibits a remarkable degradation efficiency of 100% for MG within 30 min. Such performance enhancement is attributed to the synergy between the 0D/2D dimensional matching and a potent internal electric field (IEF), which triggers an S-scheme charge transfer mechanism to preserve high redox potential while accelerating carrier separation. This work provides a sophisticated blueprint for designing dimension-matched S-scheme heterojunctions for high-performance environmental remediation.
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Nanoscale
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2026
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IF 5.1
Limeili Tian,Miaomiao Yang,Jing Wang,Shuai Yang,Chunxu Han,Yangyang Huang,Qingqiang Meng,Aiping Wu
Photocatalytic degradation is an eco-friendly method for decomposing tetracycline hydrochloride (TC), yet it faces challenges such as slow photogenerated carrier transfer, poor separation efficiency, and limited active sites. Semiconductor composites offer a promising solution to enhance catalytic efficiency. In this context, a novel 0D/2D BiOCl 0.7 I 0.3 /Bi 2 MoO 6 (BOCI-BMO) direct Z-scheme photocatalyst was synthesized via a solvothermal method, featuring 0D BiOCl 0.7 I 0.3 quantum dots anchored on 2D Bi 2 MoO 6 nanosheet. The composite photocatalyst with an optimal BOCI to BMO mass ratio of 7:3 (50 mg), achieved over 94% removal of TC (10 ppm) in 40 minutes, demonstrating excellent cyclic stability and broad applicability. Both theoretical calculations and experimental results confirm that the photogenerated carrier transport between semiconductors follows a Z-scheme mechanism, significantly enhancing carrier separation efficiency while preserving strong redox capabilities. Moreover, the unique 0D and 2D structures provide a large specific surface area, offering abundant active sites and reducing carrier transport distance, thereby boosting photocatalytic performance. This study provides theoretical and experimental insights for designing and synthesizing novel visible light-responsive photocatalysts.
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Materials Today Chemistry
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2024
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IF 6.7
Yun Zheng,Yikai Wang,Yilin Chen,Yayun Wang,Xiaoping Rao,Kang Sun,Jianchun Jiang,Chaochao Qin
The step-scheme (S-scheme) heterojunction shows the merits of controlling the directional transfer of photogenerated charge carriers and realizing a strong redox potential for photocatalytic hydrogen evolution and carbon dioxide reduction. In this paper, a zero/two-dimensional (0D/2D) S-scheme heterojunction composed of cadmium selenide quantum dots and covalent triazine frameworks (CdSe/CTF) is designed and fabricated by an electrostatic self-assembly approach. Compared with pristine CTF and CdSe quantum dots, the photocatalytic activities of CdSe/CTF composites for hydrogen evolution, carbon dioxide reduction and terpene oxidation are significantly enhanced. The hydrogen evolution rate of CdSe/CTF hybrid photocatalyst immobilized with platinum nanoparticles as cocatalyst reached 19.0 mmol g −1 h −1 under visible-light irradiation, and the apparent quantum yield is 9.8 % at 420 nm. The CdSe/CTF hybrid also exhibited more superior photocatalytic activity in carbon dioxide reduction with a carbon monoxide evolution rate of 1.48 mmol g −1 h −1 , and presented higher photocatalytic reactivity in the selective oxidation of α -terpinene to p -cymene. The remarkable enhancement of photocatalytic performance for CdSe/CTF composite is mainly attributed to the facilitated separation and transfer of photoexcited charge carriers of 0D/2D S-scheme heterojunction. This work provides an in-depth insight of utilizing semiconducting polymers as a suitable platform to sustainably transform inexhaustive solar energy to storable chemical energy.
研究领域:
材料科学
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环境科学
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化学工程
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