APPLIED CATALYSIS B-ENVIRONMENTAL
·
2019
·
IF 14.229
Yajun Pang,Yuwei Li,Guangqing Xu,Yating Hu,Zongkui Kou,Qiang Feng,Jun Lv,Yong Zhang,John Wang,Yucheng Wu
An effective photoelectrochemical sensor is urgently needed for monitoring of the environmental pollution caused by organic wastes. In this work, we report a facile in-situ illumination-assisted process to introduce uniform metal oxide (Bi 2 O 3 ) nanocrystals of 2–3 nm in sizes on carbon bridged TiO 2 nanotube arrays (TiO 2 NTAs) (Bi 2 O 3 /C@TiO 2 NTAs), in which the carbon functions as both electron trapping for high efficiency and system integration. The Bi 2 O 3 /C@TiO 2 NTAs thus made exhibit a highly selective photoelectrochemical determination performance, with low background photocurrent (derived from the decomposition of water) and high detection current (derived from the decomposition of organics target). In particular, the current detection of the Bi 2 O 3 /C@TiO 2 NTAs is 3.38 times higher than that of the pristine TiO 2 NTAs. To understand the key working principles involved, they are scrutinized by probing into the photoelectrochemical reaction process, including the light absorption, charge separation and transfer, and surface reactions. With the novel Z-scheme heterostructure system being achieved with Bi 2 O 3 /C@TiO 2 NTAs, the present work demonstrates the potential of metal oxides with uniform size in nanometer range and conductor-bridged strategy in creating Z-scheme heterostructure system with high photoelectrochemical detection performance for organics.
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
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
·
2024
·
IF 4.1
Shan Huang,Mengmeng Wang,Jiajia Liu,Xinqi Liu,Min Xue,Yi Fang,Qi Xiao
Black phosphorus (BP) is highly regarded in photocatalysis for its bandgap thickness dependency, high hole mobility, and broad visible light absorption. This study introduces a simple hydrothermal method to construct a BP QDs/BiVO 4 direct Z-scheme heterojunction. The composite’s crystal structure, morphology, and photochemical properties were comprehensively characterized. The photocatalytic activity was evaluated using Rhodamine B (RhB) degradation under visible light. Notably, BP QDs 0.12% /BiVO 4 exhibited exceptional performance, achieving a 95.4 % RhB degradation after 100 min, three times higher than BiVO 4 alone. The direct Z-scheme heterojunction played a pivotal role in facilitating O 2 − and h + involvement in the degradation process. The interfacial interaction between BP QDs and BiVO 4 significantly enhanced BiVO 4 ′s visible light absorption, preserving its strong oxidation–reduction capacity. This enhancement was further corroborated by DFT simulation calculations. Overall, this study presents a novel approach for constructing efficient Z-scheme photocatalysts based on BP QDs, laying a solid foundation for their application in the field of photocatalytic degradation.
研究领域:
材料科学
·
环境科学
·
计算化学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2020
·
IF 4.939
Zhanbin Jin,Tingting Wei,Jiayu Huang,Fengyan Li,Yi Yang,Lin Xu
In this work, a novel direct Z-scheme g-C 3 N 5 /Zn 0.5 Cd 0.5 S (CN/ZCS) heterojunction was successfully synthesized. Furthermore, its photocatalytic activity for hydrogen production was also investigated, whose photoluminescence spectrum revealed the charge transfer procedure of g-C 3 N 5 and ZCS. Moreover, the optimized hydrogen production rate of ZCS with 15 wt% of g-C 3 N 5 (15% CN/ZCS) was about 142.8 mmol/h/g and quantum efficiency (Q.E.) was circa 33.7% under 420 nm monochromatic light. Compared with the pure ZCS and ZCS with 2 wt% of Pt, the 15% CN/ZCS composite exhibited considerable improved hydrogen production rate, which was about 20 times and 7 times, respectively. The formation of CN/ZCS composite resulted in faster separation of the photogenerated electron-hole pairs. Our work may supply valuable data for the application of g-C 3 N 5 on photocatalysis .
研究领域:
材料科学
·
光催化
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2022
·Vol. 30
·期 11
·32095-32107
·
IF 5.19
Huang Hua,Tao Xin,Niu Zhirui,Qin Xiaoqian,Ren Jialu,Shan Baoqin,Liu Yu,Ren Jingyu
Visible-light-driven magnetic heterojunction as a promising photocatalysts has received much attention in environmental remediation. In this work, novel Z-scheme heterojunction MnZnFe 2 O 4 @Ag 3 PO 4 (MZFO@APO) magnetic photocatalysts with excellent visible-light-driven photocatalytic activity are successfully constructed and characterized. The photocatalytic activity for phenol degradation is measured, and photodegradation mechanism is investigated with EPR, radical trapping experiments, and LC–MS. It turns out that the heterojunction introduced MZFO exhibits good adsorption effect on visible light and the direct Z-scheme bandgap alignment of MZFO and APO significantly improves charge separation and electron transfer, outperforming that of pure APO. MZFO@APO-40% with 40% APO content shows the rapid photodegradation performance, obtaining a 100% removal efficiency of phenol (25 mg L −1 ) after 12-min visible light irradiation, and its kinetic constants are approximately 25.3 and 4.9 times higher than that of P25 TiO 2 and pure APO, respectively. Especially, MZFO@APO-40% also possesses a high magnetic separation property and can be efficiently reused for 5 cycles. Additionally, EPR and radical trapping experiments confirm that h + , O 2 − , and 1 O 2 are the main active species in the photocatalytic process. Hydroquinone and small molecular organic acids such as maleic acid and oxalic acid are detected by LC–MS, which further indicates that the pathway of phenol degradation involves hydroxylation, open-ring reactions, and mineralization reactions. The novel addition of MZFO in photocatalyst construction has the potential to promote its application in environmental remediation.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
PubMed
高影响因子
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.
研究领域:
材料科学
·
能源科学
·
环境科学
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2016
·
IF 7.145
RongQin Ye,HuaBin Fang,Yan-Zhen Zheng,Nan Li,Yuan Wang,Xia Tao
A novel direct Z-scheme CoTiO3/g-C3N4 (CT-U) photocatalytic system with different weight percentage of CoTiO3 was synthesized using a facile in situ growth method for H2 evolution from water splitting. The as-prepared CT-U composites composed of 1D CoTiO3 microrod and 2D g-C3N4 nanosheet were characterized by various techniques including XRD, SEM, TEM, XPS, FTIR, and UV–vis. Results demonstrate that the CT-U composite photocatalysts were successfully fabricated, with intimate interfacial contact and heterojunction interaction between g-C3N4 and CoTiO3 which can significantly boost the photocatalytic activity compared with prinstine g-C3N4 and CoTiO3. The most enhanced H2-evolution rate of 858 μmol h–1 g–1 and high quantum efficiency (38.4% at 365 nm, 3.23% at 420 ± 20 nm) are achieved at an optimal 0.15% CT-U. Meanwhile, the 0.15% CT-U sample exhibits good photocatalytic stability in recycling H2 evolution. Accordingly, direct Z-scheme mechanism capable of leading efficient charge carrier separation and strong reduction ability for enhanced H2 production was proposed, and further evidenced by PL, photoelectrochemical analysis, and ESR assay.
研究领域:
材料科学
·
光催化化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Run-Jing You,Kuan Wang,Huan Ma,Xin-Peng Li,Zhe Cao,Zhen-Hong He,Huan Wang,Weitao Wang,Xiaojuan Lai,Zhao-Tie Liu
The utilization of solar energy in photocatalytic CO 2 reduction technology has demonstrated a significant potential in addressing the challenges of environmental pollution and energy shortage issues. Precise modulating of the photoreduction CO 2 pathway to achieve desired products is of particular interest, while the design of cost-effective and robust catalysts remains crucial. Herein, a series of BiOBr-based photocatalysts with different Co species were synthesized through a facile simple hydrothermal method in combination with the mechanical mixing. The Co species, which can be precisely modulated from Co 3 O 4 to CoOOH by adjusting the concentration of H 2 O 2 , were anchored into the BiOBr nanospheres to establish rich Z-scheme heterojunction interfaces. The Co species modulating of BiOBr-based Z-scheme heterojunction can achieve the transform photoreduction CO 2 products from CO to CH 4 . The CO selectivity in CO 2 photoreduction to reached 98.10 % (54.10 μmol·g −1 ·h −1 ), while the CH 4 selectivity over CoOOH/BiOBr reached 72.59 % (20.06 μmol·g −1 ·h −1 ). The outstanding photocatalytic performance and selective regulation of products are ascribed to the modulation of Co species in the BiOBr-based heterojunctions, which enables the customization of the photoreduction CO 2 pathway to achieve the desired products transformation from CO to CH 4 . In situ experiments and theoretical calculations reveal that the excellent CO selectivity observed in Co 3 O 4 /BiOBr heterojunction can be ascribed to a lower energy for *CO species compared with that of hydrogenation to *HCOOH and *CHO intermediates. Conversely, the presence of *HCOOH and *CHO intermediates with lower energy levels compared with *CO species achieved superior CH 4 selectivity in CoOOH/BiOBr heterojunction. This precise design strategy insights into the meticulous customization of Co species in semiconductor-based heterostructures at the molecular level, and enlightens the selective regulation of desired products for catalysis applications.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2020
·
IF 7.489
Lihua Zhi,Shengya Zhang,Youyuan Xu,Jibing Tu,Min Li,Dongcheng Hu,Jiacheng Liu
Controllable fabrication of nanomaterials with hierarchical architecture have received much attention in the field of photocatalysis due to their enhanced light-harvesting efficiency. Moreover, fabricating direct Z-scheme heterojunctions have been proven to be effective way to enhance the photocatalytic performance of photocatalysts . Herein, hierarchically hollow WO 3 nanoflower was successfully synthesized by a simple hydrothermal treatment of tungsten chloride (WCl 6 ) in ethanol solution. Decoration of the obtained WO 3 with AgI nanoparticles in situ can form the Z-scheme AgI/WO 3 hollow hierarchical nanoflowers (AgI/WO 3 HHNFs). The AgI/WO 3 HHNFs exhibited excellent photocatalytic activity and remarkable stability for the degradation of tetracycline hydrochloride (TC-HCl) and Eosin B (EB) under the irradiation of a low energy consume light (LED lamp, 5 W). Interestingly, compared to pure AgI nanoparticles , 3D hollow WO 3 nanoflowers and AgI/WO 3 nanosheets , the AgI/WO 3 HHNFs revealed conspicuously enhanced photocatalytic activity . This phenomenon could be associated to three aspects, namely the high light-harvesting efficiency, increased light trapping and scattering capability and strongly coupled Z-scheme heterointerface, which effectively improved the photoelectron-hole sepreation efficiency. Our work therefore provide a novel insight for the fabrication of 3D hollow hierarchical structures.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2020
·
IF 3.871
Xiaohan Ma,Qinghua Chen,Guocheng Liu,Yuanming Zhou,Dong Ma,Shuaishuai Xin,Chengze Yu,Bin Zhang,Yanjun Xin
Netlike 3D Z-scheme graphitic carbon nitride (g-C 3 N 4 ) nanosheets decorated TiO 2 nanobelt-tubes (TNBTs) photoelectrodes (g-C 3 N 4 /TNBTs) were fabricated via anodization and coating technology. The network 3D photoelectrodes were characterized by HR-TEM, XPS and UV–Vis/DRS. The photoelectrochemical properties were examined to reveal the transfer and separation efficiency of photogenerated electrons. The photocatalytic activity was investigated by the photocatalytic decomposition of tetracycline hydrochloride (TC) under light irradiation. Results showed that g-C 3 N 4 with rugged surface were loaded on TNBTs by chemical bond joint to form heterostructure. The g-C 3 N 4 /TNBTs exhibited stronger visible light absorption and reduced recombination of photogenerated electron-hole pairs than TNBTs. The photocurrent response of g-C 3 N 4 /TNBTs was ~1.88-fold that of TNBTs. The photocatalytic rate of g-C 3 N 4 /TNBTs for TC was significantly higher than that of TNBTs (0.017 min −1 vs 0.007 min −1 ). The O 2 − and h + were the dominant oxidation species during the degradation of TC. The possible photocatalytic mechanism of constructing Z-scheme heterojunction was also proposed.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Zixun Fang,Yao Zhou,Yang Yang,Yidong Hou,Can Yang,Jinshui Zhang
Artificial Z-scheme photocatalytic systems, inspired by natural photosynthesis, have been widely employed for pollutant removal. In this study, we fabricated a ternary Z-scheme Bi 2 O 3 /Bi/porous carbon nitride (PCN) heterojunction with an intimately coupled interface through a simple EG-assisted solvothermal approach to improving photocatalytic performance of NO oxidation. The in-situ generated metallic Bi acts as an electron mediator, effectively accelerating the separation and transfer of photoexcited carriers. The unique Z-scheme charge transfer mechanism provides the strong redox abilities and isolates the active sites for specific reactions, thus promoting photocatalytic NO oxidation activity. As a result, the optimized Bi 2 O 3 /Bi/PCN sample achieved a NO removal efficiency of 94.6%, outperforming single-component catalysts and most previously reported heterojunction-based photocatalysts. Additionally, in-situ Fourier transform infrared spectroscopy was employed to propose the NO removal mechanism, offering valuable insight into the conversion pathway. Such a heterogeneous Z-scheme photocatalytic system with a strong redox ability, high charge-separation efficiency, and long-term stability, demonstrates significantly enhanced photoactivity for pollutant removal and is expected to attract increasing interest for other photocatalytic applications.
研究领域:
环境科学
·
材料科学
·
光催化技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
·
2024
·
IF 4.3
Jin Chen,Suqing Qin,Xiaofeng Yang,Yueying Wang,Tai Yang,Meidan Que,Yuzhao Ma,Yanjun Li
BiOBr can effectively mitigate the ecological and environmental problems caused by pollution with antibiotics, and its photocatalytic properties can be improved by utilizing heterojunction structures and cocatalysts. In this study, the Z-scheme heterojunction ternary photocatalyst BiOBr/g-C 3 N 4 /CQDs (BCC x ) was obtained by using an uncomplicated electrostatic self-assembly process. The incorporation of carbon quantum dots (CQDs) with high conductivity provided a conduit for charge transfer between g-C 3 N 4 and BiOBr. The loading density of CQDs on BiOBr/g-C 3 N 4 could be rapidly adjusted by changing the concentration of the CQDs precursor in solution. The presence of CQDs enhanced the absorption of visible light and inhibited the synthesis of photogenerated charge carriers, thereby resulting in a synergistic effect on the Z-scheme heterojunction and improving the photocatalytic properties under visible light. In particular, BCC50 had the highest catalytic performance, with a tetracycline pollutant degradation efficiency of 100% within 60 min. The degradation efficiency remained above 95% even after repeated use in five cycles. The principles of semiconductor energy bands and internal electrostatic field generation are applied to explain the photocatalytic mechanism responsible for tetracycline degradation using BiOBr/g-C 3 N 4 /CQDs.
研究领域:
环境科学
·
材料科学
·
光催化技术
✓ 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
·
环境科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）