NANOTECHNOLOGY
·
2020
·Vol. 32
·期 1
·015706
·
IF 3.551
Qiao Yin,Zhenzhen Cao,Zhiyuan Wang,Jiaming Zhai,Mingliang Li,Li Guan,Bingbing Fan,Wen Liu,Gang Shao,Hongliang Xu,Hailong Wang,Rui Zhang,Hongxia Lu
Photocatalytic degradation of pollutants has been proved to be an effective strategy for wastewater treatment. Herein, TiO2 nanoparticles were synthesized on a Ti3C2 matrix by in situ growth, forming Z-scheme TiO2@Ti3C2/Cd0.5Zn0.5S (TO/CZS) multilevel structured nanocomposites via one-step hydrothermal route. The effects of hydrothermal temperature and Cd0.5Zn0.5S content on microstructure and properties of composites were assessed. TO/CZS nanocomposites were probed into phase composition, morphological and optical properties with x-ray diffractometer, infrared radiation, scanning electron microscope and UV–vis reflective spectra. Following the hydrothermal reaction at 160 °C for 12 h, TiO2 nanoparticles of 30 nm in diameter were generated in situ on Ti3C2 lamina and Cd0.5Zn0.5S particles were evenly distributed on the Ti3C2 matrix. The photocatalytic activity of TO/CZS composites were evaluated, which found that degradation rate constant (k = 0.028 min−1) of TO/CZS-40 on Rhodamine B was 5.19 times that of pure TiO2 and 4.48 times that of Cd0.5Zn0.5S. Through anchoring Ti3C2 as an electron transition mediator and combination with TiO2 and Cd0.5Zn0.5S, the new Z-scheme between TiO2 oxidized by Ti3C2 and Cd0.5Zn0.5S establishes a multilevel structure of separating electron-hole pairs. This work demonstrates a valid way to control electrons and hole transfer directions efficiently through designing multilevel semiconductor structural designs.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
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.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
Journal of Physical Chemistry C
·
2023
·
IF 3.7
Yong Yang,Shenman Yao,Wufei Gong,Yan Liang,Ting Yu,Cailei Yuan
Light excitation has been developed as an economical way to realize room-temperature gas sensing recently. However, the high recombination rate of photogenerated carriers in semiconductor gas sensing materials leads to very limited carriers that can effectively take part in sensing reactions, which greatly restricts the further performance improvement of gas sensing under light excitation. Here, a hierarchical Z-scheme heterostructure microsphere of MoS2/SnO2 is designed and prepared. The heterostructure demonstrates an outstanding NO2 sensing performance at room temperature with the excitation of a low-power LED light (0.06 W), which exhibits an ultrahigh sensitivity of 264.2 to 10 ppm of NO2 along with acceptable response/recovery properties. The physical mechanism of NO2 sensing is analyzed. The results suggest that the construction of the Z-scheme heterostructure between MoS2 and SnO2 can greatly promote the separation of photogenerated carriers so that more photogenerated carriers can take part in the NO2 sensing reaction. Furthermore, the designing of a hierarchically porous structure can provide abundant active sites for gas sensing reactions. The work not only expands the development of Z-scheme heterostructures in gas sensing but also provides a strategy to promote the performance of light-excited gas sensors by designing a Z-scheme heterostructure with a hierarchically porous structure.
研究领域:
材料科学
·
传感器技术
✓ 已验证
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2019
·Vol. 43
·期 43
·17104-17115
·
IF 3.069
Lisha You,Minghuan Gao,Tiesheng Li,Linna Guo,Penglei Chen,Minghua Liu
Semiconductor-based photocatalysis attracts wide attention owing to its ability to directly utilize solar energy for the production of solar fuels. In particular, the construction of Z-scheme heterojunctions is demonstrated to benefit the photocatalytic performance because of the separation and transfer of the photogenerated charge carriers and well-preserved strong redox ability. In this work, a series of Z-scheme Ag3PO4/WO3 p–n junction photocatalysts were prepared employing a facile impregnation method. The photocatalysts (Ag3PO4/WO3 p–n junction) presented enhanced photo-degradation efficiency; for example, with AW-45, 99.9% degradation could be obtained for RhB (30 ppm) on irradiation (λ > 420 nm, 350 W xenon lamp) for 7 min, which is a great improvement compared with the individual constituents. The degradation rate for AW-45 was 27 times higher than that of a commercial powder (P25). The apparent kinetic rate of catalytic degradation was obtained according to the results from the degradation process. The mechanism for electron transfer between Ag3PO4 and WO3 was also investigated. The reduction and oxidation processes concentrated on the CB (conducting band) of Ag3PO4 and the VB (valence band) of WO3, resulting in promoting the mechanism for photocatalytic degradation in the Z-scheme Ag3PO4/WO3 p–n junction photocatalysts.
研究领域:
材料科学
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环境科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2020
·
IF 7.632
Yuan Lin,Qiao Zhang,Yuhang Li,Yunpeng Liu,Kejia Xu,Jiangnan Huang,Xiaosong Zhou,Feng Peng
An incompletely covered CdS/ZnS core/shell is synthesized via a simple hydrothermal method. Due to the defect energy levels introduced by zinc vacancies, the typical type-I heterojunction of CdS/ZnS evolves to a type-II heterojunction and Z-scheme hybrid structure so that the ZnS shell can timely transfer and capture the photogenerated holes from the CdS core. The surface photovoltage (SPV) distribution caused by photogenerated charges on the surface of catalyst is visually presented by Kelvin probe force microscopy with synchronous illumination (microscope SPV). It intuitively proves the effective spatial separation of photogenerated holes from the CdS core to the ZnS shell, for the first time. Under optimal conditions, the highest hydrogen production rate of CdS/ZnS reached 24.1 mmol g–1 h–1 under visible light illumination. The average apparent quantum yield of 9.3% can be achieved for 9 h of illumination (λ = 420 ± 5 nm). It exhibits highly efficient photocatalytic H2 evolution with well stability.
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
ACS Catalysis
·
2022
·
IF 13.7
Kaiwei Liu,Boyang Zhang,Jifang Zhang,Wenrui Lin,Jiaming Wang,Yao Xu,Yao Xiang,Takashi Hisatomi,Kazunari Domen,Guijun Ma
The solid solution of GaN and ZnO (GaN:ZnO) is a promising photocatalyst applicable to visible-light-driven overall water splitting. However, the band gap of active GaN:ZnO remains as large as ca. 2.7 eV because of the loss of ZnO during the widely applied NH3 nitridation process. Herein, particulate GaN:ZnO exhibiting a band gap of 2.3 eV was synthesized via calcination of a mixture of Ga2O3, Zn, and NH4Cl in a sealed evacuated tube. The synthesis method was also featured with a high nitrogen utilization rate of 87%. The prepared narrow-band-gap GaN:ZnO was active in the overall water-splitting reaction. In the presence of sacrificial reagents, the apparent quantum yields of GaN:ZnO at 420 nm for H2 and O2 generation were 5.1 and 14.3%, respectively. GaN:ZnO was applied as an oxygen evolution photocatalyst to construct a Z-scheme overall water-splitting system with SrTiO3:Rh as a hydrogen evolution photocatalyst, which achieved a solar-to-hydrogen energy conversion efficiency of 3.7 × 10–2% and a remarkable photochemical stability up to 100 h. This work provides an approach to the synthesis of narrow-band-gap GaN:ZnO solid solution and shows the potential of this material in H2 production from water under long-wavelength visible light.
研究领域:
材料科学
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光催化技术
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可再生能源
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Jiadong Li,Feng Wei,Ziyuan Xiu,Xiaojun Han
InVO 4 possesses great potential in photocatalytic CO 2 conversion. It is still highly desired to develop efficient strategies of photocatalyst fabrication to prevent its attenuated activity caused by the rapid recombination of photogenerated electron-hole. Herein, a direct Z-scheme heterojunction of Bi 2 WO 6 /InVO 4 nanosheets is constructed via two-step hydrothermal synthesis. The Bi 2 WO 6 /InVO 4 composite exhibits a superior photocatalytic performance toward CO 2 reduction into CO and CH 4 under visible light irradiation. The CO evolution rate reaches up to 17.97 μmol g −1 h −1 , while the CH 4 production rate is 1.13 μmol g −1 h −1 , which are higher than those catalyzed by bare InVO 4 and bare Bi 2 WO 6 . Based on the photoelectrochemical results, hydroxyl radical test, Scanning Kelvin Probe (SKP) and electron spin resonance (ESR) investigation, the enhanced activity of CO 2 reduction can be attributed to a Z-scheme electron transfer at the interface to promote spatial charge separation, which effectively preserves the reduction ability of photoelectron on the conduction band of InVO 4 for CO 2 conversion.
研究领域:
材料科学
·
环境科学
·
化学
✓ 已验证
DOI
高影响因子
TALANTA
·
2025
·
IF 6.1
Shihao Duan,Haipeng Zhang,Zhaopeng Liu,Jian Li,Liming Gao,Hong Jiang,Jidong Wang
Herein, a novel dual-mode biosensor integrating photoelectrochemical (PEC) and fluorescence (FL) sensing detection was developed for circulating tumor cells (CTCs) based on aptamer DNA-linked CdTe QDs (Apt-CdTe QDs)/Bi 2 MoO 6 /CdS “dual Z-scheme” sensing system. Apt-CdTe QDs were assembled on FTO/CdS/Bi 2 MoO 6 /cDNA electrode through hybridization with cDNA, resulting in the formation of a double Z-scheme CdS/Bi 2 MoO 6 /CdTe heterostructure that significantly enhanced the separation of photo-generated charge carriers, thereby improving photocatalytic efficiency. Upon the presence of MCF-7 cells, Apt-QDs were captured and subsequently released from the captured electrode, leading to a decrease in photocurrent and an increase in fluorescence intensity, thus enabling effective PEC-FL dual-mode detection. The detection of CTCs exhibited a linear relationship within the concentration range from 50 to 100000 cells mL −1 with limit of detection of 1 cell mL −1 in both PEC and FL modes. This approach effectively corrected systematic errors, improved detection accuracy and sensitivity, and held great potential in the clinical detection of CTCs.
研究领域:
生物传感技术
·
癌症诊断
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纳米医学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Science China-Chemistry
·
2023
·Vol. 66
·期 6
·1722-1730
·
IF 9.6
Xiao Ruixue,Zhang Jie,Jiang Tingting,Zhou Yefan,Wang Yun,Xu Wenjia,Feng Yuhua
Precise structural control had attracted tremendous interest in nanosynthesis due to its great importance in tailoring the physical properties of nanomaterials. Here we report the synthesis of highly ordered CdS-Au-TiO 2 ternary Janus structure via template-protected sequential growth and conversion method. Arising from the integration of the rectification effect of Au-CdS and Au-TiO 2 Schottky barriers, the Janus configuration of the CdS-TiO 2 domains, the plasmonic effect of Au nanosphere, and the Z -scheme charge transportation, the CdS-Au-TiO 2 Janus structure showed high efficiency in the model photocatalytic degradation of methyl orange (MO) dye. Importantly, the well-defined structural order allowed the identification of the correlation between the structure and the catalytic performance. We believe that the synthetic control and the mechanism insights would help the design and synthesis of sophisticated nanostructures, and would eventually promote their applications in photocatalysis fields.
研究领域:
材料科学
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纳米技术
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光催化
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Tingting Yu,Qingsong Liu,Zhiyuan Zhu,Wenwei Wu,Lifen Liu,Jinlong Zhang,Changfei Gao,Tao Yang
Using a Z-scheme MoS 2 /rGO/Bi 2 S 3 loaded onto carbon felt (CF) as the anode and BiOBr as the cathode in a photocatalytic fuel cell (PFC) was found to be an efficient photocatalytic system for degrading water contaminants such as antibiotics. Some standard analytical techniques, including scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), ultraviolet–visible spectrophotometry (UV–Vis DRS), ultraviolet photoelectron spectroscopy (UPS), electron paramagnetic resonance (EPR), high performance liquid chromatography-mass spectrometry (HPLC-MS) and electrochemical analysis (cyclic voltammetry, CV and current-time curve, I-t ), were applied to characterize the diverse properties of the electrodes. First, two typical antibiotic contaminants, berberine chloride (BEC) and tetracycline hydrochloride (TC), were used to investigate the degradation ability of the electrodes. As expected, results showed that the degradation of TC and BEC using MoS 2 /rGO/Bi 2 S 3 @CF was consistently above 90%, whereas the degradation achieved by independently using rGO/Bi 2 S 3 @CF and rGO/MoS 2 @CF was consistently below 85% and as low as 53%; this verified the excellent formation of the heterojunction. In addition, to further investigate the performance of MoS 2 /rGO/Bi 2 S 3 @CF, the test results under different conditions were discussed, such as pH, electrochemical property, light reactivity, dark absorption and recyclability in depth. All results of MoS 2 /rGO/Bi 2 S 3 @CF demonstrated good performance than rGO/Bi 2 S 3 @CF and rGO/MoS 2 @CF. Based on the UV–Vis DRS, UPS, EPR and trapping agent experiment results, the electron generated and Z-scheme transport mechanism in the fuel cell was proposed. Moreover, electron transmission from MoS 2 /rGO/Bi 2 S 3 @CF to BiOBr@CF through an external circuit further suppressed the recombination of electron-hole pairs. This new catalytic pollution control route is expected to provide a new way for efficient pollutant degradation with low energy consumption.
研究领域:
环境科学
·
材料科学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2018
·
IF 6.14
Yongjin Ma,Yuan Bian,Yi Liu,Anquan Zhu,Hong Wu,Hao Cui,Dewei Chu,Jun Pan
Photocatalytic hydrogen evolution from water splitting is a promising approach in energy conversion and storage. Here, the 0D/1D CdS quantum dots (QDs)/CeO2 nanorods heterojunction was designed and fabricated by a facile two-step method. The optimum photocatalytic H2 evolution activity for CeO2-based composites with 3 at. % CdS QDs (101.12 μ mol h–1 g–1) was 45 times as high as that of pure CeO2 nanorods (2.25 μ mol h–1 g–1) under light irradiation. Meanwhile, the photocurrent response intensity increased 17.75 times higher than pure CeO2 nanorods. Furthermore, the 0D/1D CdS QDs/CeO2 heterojunctions exhibited enhanced photocatalytic stability for long lifetime (60 h). The reasons that dramatically enhanced photocatalytic performance could be the improved light harvesting, enhanced photoresponse and stronger electronic conductivity while the CdS QDs was loaded in CeO2 nanorods to form the 0D/1D heterojunctions CdS QDs/CeO2 nanocomposites. What’s more, the remarkably increased photocatalytic performance of CdS QDs/CeO2 composites was mainly attributed to the Z-scheme between CdS QDs and CeO2 nanorods, which was confirmed by the PL (photoluminescence) method. Therefore, the proposed system is highly promising for large scale photocatalytic hydrogen evolution.
研究领域:
材料科学
·
纳米技术
·
可再生能源
·
催化
✓ 已验证
产品关联
DOI
高影响因子
MICROCHIMICA ACTA
·
2021
·Vol. 188
·期 6
·1-10
·
IF 5.833
Zhao Junhong,Cheng Jing,Sun Yudong,Liu Jiang,Chen Wen,Xu Yi,Yang Jiao,Li Yingchun
A novel photoelectrochemical (PEC) sensor based on “Z-scheme” TiO 2 @Au@CdS and molecularly imprinted polymer (MIP) was developed for the non-invasive detection of uric acid (UA). The “Z-scheme” material, consisting of an electron-transfer system (Au) and two isolated photochemical systems (CdS, TiO 2 ), was synthesized by chemical deposition method and it worked as a substrate for electro-polymerization of MIP. Due to the high photoelectric conversion efficiency provided by TiO 2 @Au@CdS and specific imprinting effect afforded by MIP, the sensor displayed desirable sensing performance with the merits of sensitivity, selectivity, repeatability, and stability. The linear range for UA detection is from 1 nM to 9 μM with the detection limit of 0.3 nM (S/ N = 3). Moreover, the assay was successfully utilized to measure UA in human tears and offered a reliable result. The incorporation of MIP and “Z-scheme” material into a PEC sensor system is expected to provide a promising strategy for detecting other small molecules. Graphical abstract
研究领域:
分析化学
·
生物传感器
·
材料科学
·
光化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）