CHEMICAL ENGINEERING JOURNAL
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2024
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IF 13.3
Shanyue Lu,Shengwei Zhang,Linlin Li,Cong Liu,Zhou Li,Dan Luo
Converting CO 2 into high-value-added chemicals by artificial photosynthesis technology effectively solves environmental problems and energy shortages. Nevertheless, it remains challenging to improve CO 2 conversion rates due to low photo-utilization and rapid electron-hole recombination. In this study, we successfully synthesized direct Z-scheme ZnIn 2 S 4 /BaTiO 3 heterojunction structure by a hydrothermal method. Specifically, compared with previous studies of various heterojunction catalysts, ZnIn 2 S 4 /BaTiO 3 heterojunction structure achieved a remarkably high yield of 105.89 μmol g -1 h - 1 , increasing 2.55 and 3.62-fold over the individual performance of ZnIn 2 S 4 and BaTiO 3 , respectively. Our investigation of photocatalytic mechanism suggest that the improved photocatalytic CO 2 reduction performance can be attributed to the synergistic effects of the piezoelectric effect and Z-scheme electron transfer mechanism. These effects can synergistically enhance space charge separation and retain photogenerated electrons, thereby facilitating a more efficient CO 2 reduction process. Consequently, this innovative piezoelectric effect-assisted Z-scheme heterojunction demonstrates immense potential to offer a novel strategy for addressing CO 2 reduction challenges and advancing sustainable energy development.
研究领域:
材料科学
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环境科学
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化学
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产品关联
DOI
高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
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2024
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IF 3.2
Hongyan Zhang,Jiehui Huang,Yuxiang Shen,Zuofang Yao,Chenchen Xing,Yanping Hou
Z-Scheme heterojunction photocatalysts can effectively suppress the recombination of charge carriers while maintaining high redox capacity. In this study, ZnTe/WO 3 (ZW) Z-scheme heterojunction photocatalysts were synthesized using a hydrothermal method, and a series of photocatalytic materials were prepared for the simultaneous removal of tetracycline (TC) and Cu(II) from water. The physicochemical and photoelectrochemical properties of the catalytic materials were characterized through various methods, including SEM, XRD, XPS, and others. The experimental results indicate that the ZW-10 % composite material exhibits the most significant removal efficiency for pollutants. Within 150 min of visible light irradiation, the removal rates for TC and Cu(II) reach 73.8 % and 73.3 %, respectively, representing a substantial improvement compared to individual ZnTe and WO 3 . Free radical capture experiments and electron spin resonance analysis reveal that ·O 2 − and ·OH are the key reactive species responsible for TC oxidation, while electrons (e − ) dominate the reduction of Cu(II).
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
高影响因子
TALANTA
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2020
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IF 5.339
Shuo Wu,Yan Zhao,Xunxun Deng,Xinlan Yang,Xiuyun Wang,Yanqiu Zhao
This work demonstrates that the photoelectrochemical response of the CdS/Bi 2 O 2.33 direct Z-scheme heterojunction, synthesized by in situ deposition of CdS nanocrystals on the defect engineered Bi 2 O 2.33 , can be modulated by oxygen defect concentration. The appropriate oxygen defects not only increase the visible light absorption, provide active reaction sites to enhance PEC activity, but also promote the separation of carriers. The formation of CdS/Bi 2 O 2.33 direct Z-scheme heterojunction further improves these properties by extending the visible light absorption and promoting separation and transport of carriers, but avoids the usage of noble metal nanoparticles as electron transfer mediators, thus has a low cost and easy fabrication technology. The CdS/Bi 2 O 2.33 direct Z-scheme junction shows significantly improved photocurrent response as compared with those containing less oxygen defects, and is applied as a photoelectrochemical assay platform for Hg 2+ . The specific interaction between Hg 2+ and the S 2− in CdS significantly quenches the photocurrent response of the CdS/Bi 2 O 2.33 due to the formation of HgS. The photocurrent decrease is linear to the concentration of Hg 2+ in the range from 10 −11 to 10 −6 g/mL, with the limit of detection of 3.2 pg/mL. High accuracy and good reproducibility are realized in the real sample analysis of urine, river water, and sea water. The integration of oxygen defect engineering and direct Z-scheme electron transport principle provides a new avenue for fabricating high performance photoelectrochemical materials, which can be further combined with bio-recognition strategy for the ultrasensitive detection of biological molecules.
研究领域:
材料科学
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环境科学
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分析化学
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DOI
PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
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2020
·Vol. 44
·期 44
·19013-19021
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IF 3.288
Yi Zheng,Yiliang Shao,Xingzhi Jin,Min Shu,Longxiao Zhang,Chunlei Li
The contact quality of a composite is an important factor for the transfer and separation of photogenerated carriers. For this, we demonstrated a cation exchange method for the in situ construction of WO3/PbWO4 linked by WO6 octahedral crystal structure units, where WO3 was placed on the surface of PbWO4. We found that the apparent rate constant of the as-prepared WO3/PbWO4 was significantly increased (17 times higher than any single one). Our investigation indicated a remarkably enhanced photodegradation rate, originating from high contact quality. The photogenerated carriers of WO3/PbWO4 were greatly separated via the grain boundary, making WO3/PbWO4 exhibit 22 times higher photocurrent density than pristine PbWO4. Moreover, the photoelectrons and holes were separated through the high contact quality grain boundary built-in electric field, which is in accordance with the transmission path of the Z-scheme. Compared with the interface, a grain boundary is more conducive to the photocatalytic process. This study provides a feasible strategy to build a highly efficient Z-scheme photocatalyst with high contact quality grain boundary to remove organic pollutants.
研究领域:
材料科学
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环境科学
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光催化
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DOI
高影响因子
ACS Applied Nano Materials
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2023
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IF 5.9
Fan Wu,Chengwei Zhou,Guoyu Tai,Yang Ma,Xi Yang,Yuwei Pan,Jiangang Han,Weinan Xing,Guangyu Wu
Z-scheme heterojunction photocatalysts with excellent redox capability show great potential in the field of environmental remediation. In this research, ZIF-67 and BiOCl were used to construct metal–organic framework (MOF)-based heterostructures, which effectively achieved 97.4% rhodamine B (RhB) degradation and 78.2% tetracycline (TC) degradation under visible light irradiation. The cyclic experiments displayed that 15% ZIF-67/BiOCl remained structurally stable after 4 cycles. Reactive species trapping demonstrates that 1O2 and ·O2– were mainly responsible for RhB and TC degradation, which were inoculated with EPR results. This work also reveals the degradation path and mechanism of heterojunction, which provides insight into the synthesis of superior photocatalysts for environmental remediation.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
ACS Applied Materials & Interfaces
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2021
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IF 9.229
Hui Chen,Wengao Zeng,Yutang Liu,Wanyue Dong,Tao Cai,Lin Tang,Juan Li,Wenlu Li
It is important to find an effective way to enhance the photocatalytic efficiency of metal–organic frameworks. In this work, an organic supermolecule perylene diimide (PDI) semiconductor with a carboxyl terminal was added into the synthesis process of MIL-53(Fe) crystals. The PDI/MIL-53(Fe) (PM) composite photocatalyst was first obtained. The TC-H photodegradation rate of the most efficient 5PM was nearly 94.08% within 30 min, whose apparent reaction rate constant (k) is 4 times that of PDI and 33 times that of MIL-53(Fe), respectively. By investigation and characterization, it has been found that PDI nanofibers were dispersed and fixed in MIL-53(Fe) and bonded to each other by covalent bonds. The radical trap experiments and electron spin resonance analysis illustrated that hydroxyl radical (·OH), superoxide radical (·O2–), and photogenerated holes (h+) were active species. Combined with the band structure of PDI and MIL-53(Fe), it is proposed that the PM photocatalyst was a Z-scheme heterojunction mechanism. Therefore, PM photocatalysts showed excellent charge separation and transfer ability. The performance improvement of 5PM is due to enhanced visible light absorption, efficient charge separation, and excellent redox potential. Five cyclic photocatalytic tests and experiments further demonstrate that the 5PM photocatalyst has a promising future for pollutant removal.
研究领域:
材料科学
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环境科学
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化学
✓ 已验证
DOI
PubMed
高影响因子
CHINESE JOURNAL OF CATALYSIS
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2018
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IF 3.525
Zhen Qin,Wenjian Fang,Junying Liu,Zhidong Wei,Zhi Jiang,Wenfeng Shangguan
A two-step photocatalytic water splitting system, termed a “Z-scheme system”, was achieved using Zn-doped g-C 3 N 4 for H 2 evolution and BiVO 4 for O 2 evolution with Fe 2+ /Fe 3+ as a shuttle redox mediator. H 2 and O 2 were evaluated simultaneously when the doping amount of zinc was 10%. Moreover, Zn-doped (10%) g-C 3 N 4 synthesized by an impregnation method showed superior active ability to form the Z-scheme with BiVO 4 than by in-situ synthesis. X-ray diffraction, UV-Vis spectroscopy, scanning electron microscopy, and X-ray photoelectron spectroscopy were used to characterize the samples. It was determined that more Zn–N bonds could be formed on the surface of g-C 3 N 4 by impregnation, which could facilitate charge transfer.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR STRUCTURE
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2024
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IF 4
Longting Qi,Yujing Xie,Jing Ding,Jinfeng Zhang,Hui Wan,Guofeng Guan
Bi 2 MoO 6 has drawn considerable attention in the field of photocatalysis owing to its excellent visible light response and photo-generated carriers transport ability. However, pure Bi 2 MoO 6 suffers from the limited surface-active sites and poor photogenerated charge separation efficiency, resulting in unsatisfactory photocatalytic performance. Herein, the 2D/2D Bi 2 MoO 6 /BiOBr Z-scheme heterojunction photocatalysts were synthesized by in-situ hydrothermal growth of Bi 2 MoO 6 on BiOBr. The optimized heterojunction catalyst, Bi 2 MoO 6 /BiOBr-40 % exhibited a CH 3 OH yield of 6.21 μmol·g -1 ·h -1 , which was twice that of the pure Bi 2 MoO 6 . Simultaneously, mechanism study by the band potential estimation and electron spin resonance (ESR) analysis evidenced that the enhanced activity was ascribed to the Z-scheme. This unique structure could enhance the spatial separation of electron-hole pairs, remain the strong redox ability. Moreover, the density functional theory (DFT) calculations were carried out to further expose the charge transfer mechanism of composites. This paper provided a novel approach for the design and manufacture of 2D/2D Z-scheme heterojunctions for energy conversion and environmental remediation.
研究领域:
材料科学
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环境科学
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能源科学
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产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2025
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IF 9.7
Wen-Rong Fu,Shui-Miao Yu,Xianglin Xiang,Jian Yang,Zong-Yan Zhao
Layered delafossite, an inherently p-type semiconductor, has emerged as a highly promising photocathode material for photoelectrochemical (PEC) water splitting. However, its PEC performance and scalability are significantly limited by the shortcomings of conventional photoelectrode fabrication techniques, which often involve inferior physical adhesion or require harsh processing conditions. In this study, a Cu x O layer is introduced via in-situ oxidation of a copper foam (CF) substrate to achieve embedded anchoring of delafossite CuFeO 2 (CFO), thereby developing a robust embedded CF/(CFO@Cu x O) photocathode. This configuration features extensive and strong 3D semiconductor/semiconductor heterointerfaces. The embedded structure significantly reduces the carrier diffusion length to the CF, thereby enhancing photocarrier collection efficiency. Additionally, this unique geometric design provides abundant heterointerfaces with all-round contact, promoting efficient carrier separation while strengthening interfacial binding. Theoretical calculations further reveal the formation of a strong built-in electric field and a Z-scheme heterostructure, which facilitate effective photocarrier separation and transfer while maintaining robust redox activity. Remarkably, the photocurrent density of the embedded CF/(CFO@Cu x O) photocathode at zero bias is 2.73-fold higher than that of the traditional sandwich-stacked CF/Cu x O/CFO photocathode and 21.55-fold higher than that of the original CF/CFO photocathode. Furthermore, the scalability of this approach is demonstrated through the fabrication of a 100 cm 2 embedded photocathode. This work presents a scalable and cost-effective nanofabrication technique for robust photoactive films, enabling efficient and stable PEC water splitting.
研究领域:
材料科学
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能源科学
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产品关联
DOI
PubMed
高影响因子
RENEWABLE ENERGY
·
2019
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IF 5.439
Tao Wang,Xiqing Liu,Qiuyue Men,Changchang Ma,Yang Liu,Pengwei Huo,Yongsheng Yan
To completely utilize the high redox ability of photo-induced charge carriers. Here, a Z-scheme photocatalyst of TiO 2 QDs/Bi 12 TiO 20 (TBT) composites with TiO 2 QDs fragment attached to the surface of Bi 12 TiO 20 (BTO) was prepared and the photocatalytic activity was evaluated by degradation of gatifloxacin (GF). The optimal photocatalytic performance of TBT displayed 3 times higher than bare BTO. The improved photocatalytic performance was ascribed to the effective separation of the charge carriers between TiO 2 QDs and BTO via the direct Z-scheme heterojunction . Such a strategy for the construction of Z-scheme TBT composites for removal of organic pollutants, proving new insights into design photocatalyst.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2020
·
IF 4.65
Wang Cao,Caiyun Jiang,Chen Chen,HaiFei Zhou,Yuping Wang
The novel Z-scheme CdS/Bi 4 O 5 Br 2 heterostructure was successfully synthesized by a simple mixed-solvent thermal method. It proved that the Z-scheme CdS/Bi 4 O 5 Br 2 heterojunction was constructed by XRD , SEM, TEM and XPS. The synthesis of CdS nanospheres on ultra-thin Bi 4 O 5 Br 2 nanosheets to form a heterojunction interface was beneficial to the dispersion and transfer of the photogenerated electron–hole pairs, which was demonstrated by PL , i-t and EIS. UV-Vis diffuse reflectance spectra attested CdS/Bi 4 O 5 Br 2 heterojunction enhanced utilization of visible light. The Z-scheme 0.5-CdS/Bi 4 O 5 Br 2 heterojunction exhibited the highest photocatalytic performance for degradation process of CIP and TC than that of pure CdS and Bi 4 O 5 Br 2 . In addition, recycling tests declared that the Z-scheme 0.5-CdS/Bi 4 O 5 Br 2 heterojunction compared with single CdS had higher stability and durability, attributing to effectively alleviating photocorrosion of CdS. It could be seen from the trapping agent experiment that superoxide free radicals and hydroxyl free radicals were the main active substances. The possible photocatalytic mechanism of the Z-scheme 0.5-CdS/Bi 4 O 5 Br 2 heterojunction under visible light irradiation was proposed.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2017
·Vol. 42
·期 1
·489-496
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IF 3.269
Zengyu You,Qianhong Shen,Yuxuan Su,Yang Yu,Hui Wang,Tian Qin,Fang Zhang,Di Cheng,Hui Yang
A novel Z-scheme core–shell g-C3N4/MCNTs/BiOI heterojunction was successfully designed and fabricated through filling multi-walled carbon nanotubes (MCNTs) with g-C3N4, followed by the loading of BiOI on the outer surface of the MCNTs. The structure–property relationship was analyzed by X-ray diffraction (XRD), Fourier transform infrared spectra (FT-IR), scanning electron microscopy (SEM), transmission electron microscopy (TEM), UV-vis diffuse reflectance spectra (DRS), photoluminescence spectra (PL), ESR probe tests and reactive species trapping measurements. The results show that the BiOI nanoparticles are uniformly loaded on the surface of the MCNTs which are fully filled by g-C3N4. The MCNTs connect the two semiconductors of g-C3N4 and BiOI, and serve as electron mediating conductors to promote the transfer of the photo-generated electrons, thereby constructing a Z-scheme heterojunction between g-C3N4 and BiOI. With this unique structure, enhanced visible-light photocatalytic activities are achieved because of the synergistic effect of light harvesting and improved separation efficiency of photo-generated carriers.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
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