APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Jiping Shi,Liuqing Hua,Lu Ruan,Xingjian Zhang,Zhengdao Li,Fengyun Su,Xin Li,Haiquan Xie,Yong Zhou
The ZnIn 2 S 4 nanosheets were successfully synthesized on the surface of compacted stainless steel mesh using a simple solvothermal method, and further modified with Cu x O nanoparticles to form ZnIn 2 S 4 /Cu x O heterojunction photocatalyst via a wet chemistry approach. These photocatalysts were then utilized for photothermal catalytic CO 2 reduction under full spectrum solar light. The experimental results demonstrated that the deposition of the photocatalyst on the flexible substrate effectively prevented the aggregation of ZnIn 2 S 4 nanosheets. The incorporation of Cu x O nanoparticles enhanced the specific surface area of the photocatalyst, and created a Z-scheme heterojunction with ZnIn 2 S 4 to improve the utilization efficiency of photogenerated electrons. It was noteworthy that the dark red Cu x O exhibited a full spectrum response and excellent photothermal effect, thereby facilitating carrier migration and reducing CO 2 catalytic reaction barriers. Consequently, the optimized ZnIn 2 S 4 /Cu x O exhibited significantly enhanced CO 2 to CO yield of 1515.8 μmol m -2 h −1 and CH 4 yield of 1579.4 μmol m -2 h −1 , which was about 7.5 and 7.6 times higher than those achieved by pure ZnIn 2 S 4 , respectively. Furthermore, this study provided detailed insights into the mechanism of photocatalytic CO 2 reduction over composite material as well as valuable guidance for designing immobilized photocatalysts with high activity for CO 2 reduction.
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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产品关联
DOI
高影响因子
SEMICONDUCTOR SCIENCE AND TECHNOLOGY
·
2021
·Vol. 36
·期 7
·075004
·
IF 2.352
Yefeng Chen,Dan Tang,Zhuhan Wang,Wen Li,Mengyun Yin,Qin Yang,Yafen Zhou,Kaiming Zhang,Taotao Kan,Limei Zhou
As an important intermediate, imine is widely used in industrial chemistry. The photocatalytic oxidation of amines to form imines is a green and economical method. But it remains a challenge for the efficient transformation under mild conditions. Herein, a Z-scheme carbon nitride (CM)-Fe2O3 heterojunction photocatalyst was synthesized by in-situ preparation of Fe2O3 nanoparticles on two-dimensional CM nanosheets. The as-prepared catalyst exhibited efficient photocatalysis activity in selective oxidation of benzylamine to N-benzylidene benzylamine. Under ambient air and room temperature, the selectivity and conversion rate both can reach 99.9%, and the corresponding turnover frequency value reaches up to 9.99 mmol g−1 h−1, superior to the most of heterogeneous photocatalysts reported in previous literatures. The excellent catalytic activity of the modified CM material may be due to the enhanced absorption of visible light and the improved photogenerated carrier separation and migration rate, and the Z-scheme mechanism also retains the strong oxidation and reduction ability of the composite material. This work will provide a promising and practical method to promote the photocatalytic conversion of solar-driven organics.
研究领域:
材料科学
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环境化学
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光催化技术
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DOI
高影响因子
PHOTOCHEMICAL & PHOTOBIOLOGICAL SCIENCES
·
2019
·Vol. 19
·期 1
·80-87
·
IF 2.408
Tingting Wei,Zhanbin Jin,Fengyan Li,Dandan Yan,Lin Xu
In this work, a series of samples of Cd0.5Zn0.5S (ZCS) nanoparticles decorated with porous TaON were successfully prepared as a direct Z-scheme system. The photocatalytic evolution of H2 with a high efficiency was explored using NiS decorated with TaON sensitized ZCS nanocomposites (NiS-TaON/ZCS) and Na2SO3/Na2S as sacrificial reagents. The results showed that 0.5 wt% NiS deposited on the surface of 4 wt% TaON-ZCS nanocomposites could reach the highest photocatalytic H2 evolution rate of 34.8 mmol h−1 g−1 with a maximum quantum yield of about 25.5% under 420 nm monochromatic light. The activity of the TaON-ZCS photocatalyst for photocatalytic H2 evolution is higher than that of either pure ZCS or TaON. This high photocatalytic performance is ascribed firstly to the hierarchical structure of the coupled semiconductor system and secondly to the efficient transfer and separation of photogenerated charge carriers with NiS as a cocatalyst, which could serve as an electron collector.
研究领域:
材料科学
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能源科学
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化学工程
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DOI
高影响因子
ENVIRONMENTAL RESEARCH
·
2023
·
IF 8.3
Chunyan Hu,Jinke He,Jianjun Liang,Tao Lin,Qiuliang Liu
A novel photo-Fenton catalyst α-Fe 2 O 3 @g-C 3 N 4 @NH 2 -MIL-101(Fe) (FGN) with dual Z-scheme heterojunction was successfully prepared by hydrothermal method to degrade tetracycline (TC). The preparation conditions were optimized by orthogonal test, and the successful synthesis was confirmed by characterization analyses. The prepared FGN showed better light absorption performance, higher photoelectrons-holes separation efficiency, lower photoelectrons transfer resistance, and higher specific surface area and pore capacity compared with α-Fe 2 O 3 @g-C 3 N 4 and α-Fe 2 O 3 . The effects of experimental conditions on the catalytic degradation of TC were investigated. The degradation rate of 10 mg/L TC could reach 98.33% within 2 h when the dosage of FGN was 200 mg/L, and the degradation rate could remain 92.27% after 5 times of reuse. Furthermore, the XRD spectra and XPS spectra of FGN before and after reuse were compared to explore the structural stability and catalytic active sites of FGN, respectively. According to the identification of oxidation intermediates, three degradation pathways of TC were proposed. Through H 2 O 2 consumption experiment, radical-scavenging experiments, EPR results, the mechanism of the dual Z-scheme heterojunction was proved. The improved performance of FGN was attributed to the dual Z-Scheme heterojunction effectively promoting the separation of photogenerated electrons from the holes and accelerating the electrons transfer , and the increase of the specific surface area.
研究领域:
环境科学
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材料科学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2020
·
IF 7.489
Beibei Wang,Dongyun Chen,Najun Li,Qingfeng Xu,Hua Li,Jinghui He,Jianmei Lu
We report an unique 2D/2D Iodine doped BiOIO 3 /g-C 3 N 4 heterojunction was successfully prepared. The iodine doped BiOIO 3 was prepared by a simple solvent exchange method and combined with g-C 3 N 4 by solvothermal method . The prepared photocatalyst has potential application value in the future due to its excellent stable cycle property. BiOIO 3 nanoplates and g-C 3 N 4 nanosheets form a close interfacial contact directly, so the catalyst has higher charge transport efficiency and wide visible range due to the introduction of iodide ions. Synergistic heterojunction exhibits strong photocatalytic activity for degradation of NO at ppb-level under visible light , of which 30% Iodine doped BiOIO 3 /g-C 3 N 4 can achieve a maximum removal rate of 57% for NO. According to the experimental results of ESR and other experiments, a more complex Z-scheme photocatalytic mechanism is proposed, which has stronger redox ability than the traditional mechanism.
研究领域:
环境科学
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材料科学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
·
2016
·
IF 2.477
Xiaojuan Zhao,Jiajie Yu,Hongda Cui,Tianhe Wang
In this study, for the first time, BSO/g-C 3 N 4 composite photocatalysts were synthesized by high temperature solid-state reaction method. The influence of systematically varied g-C 3 N 4 contents on the photocatalytic activity was investigated in detail. The photocatalytic activity of the catalysts was evaluated through the degradation of methylene blue (MB) and acid red 18 (AR 18) as target pollutants under visible light irradiation. The results demonstrated the photocatalytic performance of the BSO/g-C 3 N 4 composites was greatly enhanced compared to pure photocatalyst. In addition, the optimized photocatalytic efficiency for MB and AR 18 was achieved when the mass percentage of g-C 3 N 4 in the composite was 60%. And based on our analysis, it is proposed that the BSO/g-C 3 N 4 has the characteristic of direct Z-scheme type photocatalyst. The excellent photocatalytic performance was interpreted in terms of enhanced visible light absorption and efficient separation of electrons and holes. Compared with hydrothermal method, this method only involves sintering in air at a moderately elevated temperature, so it is efficient and more preferred for industrial scale production.
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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产品关联
DOI
高影响因子
Materials
·
2023
·Vol. 16
·期 2
·868
·
IF 3.4
Kai Zhang,Kehao Zhang,Yuxiang Ma,Hailong Wang,Junyong Shao,Mingliang Li,Gang Shao,Bingbing Fan,Hongxia Lu,Hongliang Xu,Rui Zhang,Huanhuan Shi
TiO2/Au/BDD composites with a Z-scheme structure was prepared by orderly depositing gold (Au) and titanium dioxide (TiO2) on the surface of a boron-doped diamond (BDD) film using sputtering and electrophoretic deposition methods. It was found that the introduction of Au between TiO2and the BDD, not only could reduce their contact resistance, to increase the carrier transport efficiency, but also could improve the surface Hall mobility of the BDD electrode. Meanwhile, the designed Z-scheme structure provided a fast channel for the electrons and holes combination, to promote the effective separation of the electrons and holes produced in TiO2and the BDD under photoirradiation. The electrochemical characterization elucidated that these modifications of the structure obviously enhanced the electrocatalytic performance of the electrode, which was further verified by the simulated wastewater degradation experiments with reactive brilliant red X-3B. In addition, it was also found that the photoirradiation effectively enhanced the pollution degradation efficiency of the modified electrode, especially for the TiO2/Au/BDD-30 electrode.Keywords:boron-doped diamond;TiO2;Z-scheme;electrocatalysis;wastewater treatment
研究领域:
环境科学
·
材料科学
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产品关联
DOI
PubMed
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2023
·
IF 4.6
Debin Zeng,Longtao Wang,Ruian Du,Zhen Wu,Xiting Wang,Chunguang Kuai,Yuzheng Guo,Changlin Yu
CO 2 photoreduction under mild conditions remains challenging, attributing to sluggish kinetics of complex coupling process of multi-electrons-protons and inefficient electron-hole pairs utilization. Herein, with Zn 3 V 2 O 8 as a phase transformation material, we construct an effective Zn 2 V 2 O 7 /Zn 3 V 2 O 8 /ZnO (OVZn) Z-scheme system by partial decomposition of Zn 3 V 2 O 8 into Zn 2 V 2 O 7 and ZnO. Time-resolved fluorescence decay (TRFD) spectra investigation shows that the photogenerated electrons of Zn 2 V 2 O 7 and ZnO recombine with the holes of Zn 3 V 2 O 8 , retaining more reductive electron of Zn 3 V 2 O 8 for CO 2 reduction. Moreover, in-situ Fourier-transform infrared spectroscopy suggests that the heterostructure can lower the energy barrier of CO desorption by changing bridge-bonded CO to linear-bonded CO and optimizing the energy barrier of CO production. Moreover, Cu, Ag and Au loading on OVZn greatly enhance light harvesting and promote photoelectric conversion, producing much photogenerated electron-hole pairs for CO 2 reduction. OVZn and metal loaded OVZn have better photocatalytic performance, showing application superiority on CO 2 photoreduction.
研究领域:
材料科学
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环境科学
·
化学
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产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Lei Zuo,Ning Yang,Weiwei Xia,Xianghua Zeng,Rongxing Cao
Due to exceptional photocatalytic hydrogen evolution properties, ZnCdS is considered as a promising strategy to enhance the photocatalytic hydrogen evolution performance of ZnCdS with introducing sulfur vacancy or constructing heterostructures. Here, sulfur vacancy-rich ZnCdS nanoparticles were synthesized via a straightforward co-precipitation method followed by a high-temperature annealing treatment. Then NiS@ZnCdS composites were prepared with the hydrothermal method after mixed the precursors of Ni(Ac) 2 ·2H 2 O and CH 4 N 2 S with the prepared Zn 0.5 Cd 0.5 S powders. Thereafter, the prepared samples were used as photocatalysts for hydrogen production. The results showed that the optimized NiS@ZnCdS heterostructures has a photocatalytic hydrogen production rate of 42 mmol · g −1 ·h −1 , which is 14 times higher than that of the ZnCdS sample without annealing treatment. The mechanism behind has been analyzed. A staggered band energy alignment between NiS and ZnCdS was constructed from the measurements of ultraviolet photoelectron spectroscopy (UPS) and XPS spectra, and a z-scheme charge transfer mode was proposed between NiS and ZnCdS with an assistance of electron spin resonance (ESR) signals of •O 2 − . The z-scheme heterostructure between NiS and ZnCdS can enhance the separation of photogenerated electron-hole pairs and increase the photocatalytic activity. The studies will be helpful to construct the NiS related heterostructure.
研究领域:
材料科学
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能源化学
·
催化科学
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产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2024
·
IF 20.2
Yuanyuan Qi,Shuming Li,Tengfei Bao,Ping She,Heng Rao,Jun-sheng Qin
Molecular catalysts have attracted significant attention in photocatalytic CO 2 reduction (PCR) due to well-defined structure and exceptional catalytic selectivity. However, they are still limited by recycling challenges and inherent instability. Forming an organic-inorganic composite can address these issues and enhance PCR performance simultaneously. Herein, we developed a flower-like Z-scheme heterojunction of cobalt porphyrin ([meso-tetra(4-sulfonatophenyl)porphyrin], CoTPPS) and ZnIn 2 S 4 (ZIS). The optimized ZIS@CoTPPS exhibited a superior CO evolution rate of 388.26 μmol g −1 h −1 , which is 8.96 times of pristine ZIS (43.32 μmol g −1 h −1 ). The superior PCR activity is contributed by the enhanced light absorption, and photoinduced charge separation facilitated by the Z-scheme structure and the cobalt active sites. Moreover, theoretical calculations confirm the heterojunction relies on a substantial interfacial coupling between the Zn atoms of ZIS and the sulfonic acid groups of CoTPPS through coordination assembly. This investigation affords a useful inspiration for consciously constructing novel ZIS-incorporated atomistic Z-scheme photocatalysts.
研究领域:
材料科学
·
环境科学
·
化学
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产品关联
DOI
高影响因子
CRYSTENGCOMM
·
2017
·Vol. 19
·期 6
·982-993
·
IF 3.474
Yadong Meng,Yuanzhi Hong,Changyou Huang,Weidong Shi
Novel Z-scheme InVO4/CdS heterojunction photocatalysts have been successfully synthesized for the first time via a microwave-assisted process, followed by a mild hydrothermal method. The crystal structures, morphologies and sizes, chemical compositions and optical properties of the prepared photocatalysts were characterized via X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), high-resolution transmission electron microscopy (HRTEM), X-ray photoelectron spectroscopy (XPS), UV-vis diffuse reflectance spectroscopy (DRS), and photocurrent measurements. Results showed that the prepared InVO4/CdS heterojunctions were composed of about 15 nm InVO4 nanoparticles and 1.5 μm CdS microspheres, and all heterojunctions exhibited good photoabsorption in the visible light region. The photocatalytic activity of the obtained samples was carefully evaluated via the degradation of rhodamine B (RhB) and ciprofloxacin (CIP) under visible light irradiation (λ > 420 nm). Compared to that of bare InVO4 and CdS, the InVO4/CdS heterojunctions exhibited significantly enhanced photocatalytic activity for RhB and CIP degradation. Moreover, the 40 wt% InVO4-coupled CdS composite displayed the highest catalytic efficiency for RhB photodegradation, which is about 59.4 and 4.8 times higher than that of pure InVO4 and CdS, respectively. In addition, the active species trapping experiment and electron spin resonance (ESR) measurement demonstrated that h+ and ˙O2− radicals were the predominant active species in the photocatalytic reaction process. Furthermore, the possible enhanced photocatalytic mechanism of InVO4/CdS heterojunctions was also proposed based on the band position measurements and ESR analysis.
研究领域:
材料科学
·
纳米技术
·
环境化学
·
光催化
·
无机合成
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2019
·
IF 4.175
Li Li,Jiumao Cai,Yunhui Yan,Fengying Zhao,Jianguo Zhou
Novel flower-like direct Z-scheme WS 2 /Bi 2 O 2 CO 3 photocatalyst was fabricated via a one-pot hydrothermal method . The structure, morphology, together with the optical and photoelectrochemical properties of the photocatalysts were analyzed by various techniques. The flower-like WS 2 /Bi 2 O 2 CO 3 photocatalyst exhibited efficient removal of Lanasol Red 5B, with rate constants of 1.85 and 3.23 times higher than that of Bi 2 O 2 CO 3 under UV and simulated solar irradiation, respectively. Additionally, the flower-like WS 2 /Bi 2 O 2 CO 3 photocatalyst exhibited 95% ciprofloxacin removal efficiency within 90 min. The enhanced photocatalytic activity of optimal WS 2 /Bi 2 O 2 CO 3 could be attributed to the synergistic effect of the effective photoinduced charge carrier separation and transfer, the enhanced light harvesting ability and larger specific surface area. Furthermore, the active species trapping and ESR experiments indicated that hole (h + ), superoxide radical (•O 2 − ) and hydroxyl radical (•OH) were main reactive species in the photocatalytic process. The WS 2 /Bi 2 O 2 CO 3 heterojunction was speculated to follow a Z-scheme charge transfer mechanism. This facile method provides new possibilities for the fabrication of effective Bi 2 O 2 CO 3 -based photocatalysts for environmental remediation.
研究领域:
环境科学
·
材料科学
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DOI
高影响因子
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