JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
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2020
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IF 6.155
Miao-Miao Fang,Jun-Xia Shao,Xiang-Gang Huang,Jin-Yi Wang,Wei Chen
A direct Z-scheme CdFe 2 O 4 /g-C 3 N 4 hybrid systems with different weight ratios of CdFe 2 O 4 nanoparticles were successfully designed and constructed for ceftiofur sodium photodegradation. The as-obtained CdFe 2 O 4 /g-C 3 N 4 hybrid samples composed of CdFe 2 O 4 nanoparticles and g-C 3 N 4 nanosheets were systematically characterized by different techniques including X-ray diffraction, scanning electron microscope, transmission electron microscope, Fourier transform infrared spectroscopy , X-ray photoelectron spectroscopy, UV–vis DRS , chemical oxygen demand, inductively coupled plasma mass spectrometer, photochemical test and electron spin resonance spectrometer technique. The optimal photocatalytic activity for ceftiofur sodium photodegradation was achieved by modulating the weight ration between CdFe 2 O 4 nanoparticles and g-C 3 N 4 nanosheets. The result from photocatalytic tests indicate that CdFe 2 O 4 /g-C 3 N 4 -2 hybrid sample exhibit highly efficient photocatalytic activity towards ceftiofur sodium removal in comparison with pristine CdFe 2 O 4 nanoparticles and pure g-C 3 N 4 nanosheets. Meanwhile the excellent photocatalytic stability of CdFe 2 O 4 /g-C 3 N 4 -2 hybrid sample was also verified during recycling runs towards photocatalytic ceftiofur sodium degradation. The significant enhancement of photocatalytic activity was attributed to the Z-scheme charge separation and transfer based on the construction of tight heterogeneous interface and well-matched band potentials. We expect this research to provide a new insight into the design and preparation of direct Z-scheme hybrid 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
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2018
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IF 4.229
Wei Zhao,Jincheng Liu,Zhenyu Deng,Jinhong Zhang,Zhongxiang Ding,Yanxiong Fang
Photocatalytic hydrogen evolution is a prospective approach to solve the problem about energy crisis by fossil fuel combustion . As the good candidate to generate hydrogen under visible light irradiation , the rapid charge recombination and easy photocorrosion of pure CdS nanomaterials limited its hydrogen generation activity and photocatalytic stability. Here we constructed a novel ternary Z-scheme CdS Ag TiO 2 composite based on CdS nanowires by a three-step process to solve this problem. Compared with CdS TiO 2 and CdS, the Z-scheme CdS Ag TiO 2 composites could obviously extend the light-absorption region, accelerate the transfer rate of charge-separation, and possess stronger redox capability. The prepared Z-scheme CdS Ag TiO 2 composites show high photocatalytic hydrogen evolution rate of 1.91 mmol h −1 g −1 , which is 1.50 and 2.45 times that of CdS TiO 2 heterojunction and pure CdS nanowires. The Z-scheme photocatalytic system exhibits the synergetic effects due to more efficient charge transfer and surface plasmon resonance absorption. Ag nanoparticles used as electron mediator could decrease the recombination of the photocarriers, alter the path of charge transfer and suppress the photocorrosion. This work opens up a new way for the novel Z-scheme photocatalytic systems that suppress the photocorrosion of CdS, and has a promising application in the photocatalytic water splitting.
研究领域:
材料科学
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能源科学
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纳米技术
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产品关联
DOI
高影响因子
Catalysts
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2022
·Vol. 12
·期 10
·1250
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IF 4.501
Lei Zhao,Tingting Yu,Bing Yang,Huilin Guo,Lifen Liu,Jinlong Zhang,Changfei Gao,Tao Yang,Mingyan Wang,Yu Zhang
Unlike many studies on the preparation of Z-scheme heterojunctions by doping precious metals, in this paper we first prepared a core-shell material obtained by C doping in ZnO and then composite with MnO2to form a heterojunction; that is, a low-cost and highly catalytic ternary composite catalyst was prepared by a simple hydrothermal reaction. Meanwhile, a large amount of experimental data have enabled the heterostructure type as well as the mechanism of photocatalytic performance to be fully demonstrated. It is proven that C as an intermediate medium achieves electron transport while making up the deficiency of ZnO, and constitutes an all-solid state Z-scheme heterojunction, which enables the rapid transfer of photogenerated electron pairs and visible light irradiation to the stream to improve the photocatalytic performance of the composite photocatalyst. In terms of examination of degradation performance, this catalyst showed a high photodegradation rate of tetracycline hydrochloride (TC) of 92.6% within 60 min, and the surface ZnO-C/MnO2catalysts also showed good degradation effect on practical petrochemical wastewater in CODcr degradation experiments.Keywords:ZnO-C/MnO2;Z-scheme heterojunction;wastewater purification;mechanism exploring
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
OPTICAL MATERIALS
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2022
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IF 3.754
Hao Hu,Jiacheng Jin,Mingchen Xu,Chengdong Xu,Yue Cheng,Weiwei Ji,Zhencen Ding,Min Shao,Yushan Wan
The present work demonstrates the synthesis of the microsphere composite photocatalyst Bi 3 O 4 Br/NH 2 -MIL-125(Ti) (BOB/NMILT) system, and the physicochemical properties of the material were analyzed by various characterization means. Further, the photocatalytic performance of the BOB/NMILT system was evaluated by degrading tetracycline (TC) under simulated sunlight. The degradation rate of TC using BOB/NMILT-5 reached 88.5% within 90 min. The degradation rate is 6.5 times and 3 times higher than that of individual catalysts NH 2 -MIL-125(Ti) (NMILT) and Bi 3 O 4 Br, respectively. The improvement in photocatalytic activity of composites mainly benefited from the construction of heterojunctions , which effectively inhibited the recombination of carriers. Importantly, the role of h + and •O 2 − was found to be significant in the reaction of TC. Cumulatively, a Z-scheme photocatalytic degradation mechanism of tetracycline on the BOB/NMILT composite system was proposed. The proposal of this system is of great significance for the future development of photocatalytic materials that can degrade tetracycline.
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
ChemSusChem
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2024
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IF 7.5
Tong Xu,Tao Shan,Yuting Jiang,Lian-hua Xu,Huiyan Zhang,Sheng Chu
Graphical Utilizing solar energy to upcycling plastic waste into value-added chemicals is a promising strategy for realizing sustainable development. In this study, an efficient photocatalytic conversion of polyethylene plastic into syngas (CO+H 2 mixtures) by using a ZnS/Ga 2 O 3 Z-scheme heterojunction photocatalyst is reported. The strategy provides a green approach to effectively mitigate plastic pollution under environmentally friendly conditions. The photocatalytic conversion of plastic waste into value-added products using solar energy presents a promising approach for promoting environmental sustainability. Nonetheless, the emission of CO 2 during the conventional photocatalytic degradation process remains a major hurdle that impedes its further development. In this study, we propose an efficient photocatalytic conversion of polyethylene plastic into syngas (CO+H 2 mixtures) by using a ZnS/Ga 2 O 3 Z-scheme heterojunction photocatalyst. It is found that the strong redox capability of photogenerated holes and electrons in the Z-scheme heterojunction photocatalyst can promote the oxidative depolymerization of PE plastic, concurrently enabling the efficient reduction of the intermediate product CO 2 into syngas. Furthermore, this system also demonstrates applicability in the conversion and upcycling of other polyolefin plastics including polypropylene and polyvinyl chloride. Our findings highlight the potential of polyolefin plastics photoreforming for the production of syngas under environmentally benign conditions.
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
Reactions
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2025
·Vol. 6
·期 2
·24
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IF 2.2
Kuo Zhang,Xiufei Zhao,Hang Qian,Lihong Chen,Biyu Wu,Xiao Yang,Haonan Zou,Yujiao Hu,Feng Chen,Borong Liao,Hu Zhou,Lei Zhang,Tianyi Ma,Yusheng Zhang
Cu2O, a narrow-bandgap semiconductor with visible light absorption capabilities, faces limitations in photocatalytic applications due to photocorrosion from hole self-oxidation and insufficient light absorption. In this work, a series of novel spherical Cu2O/FePO4Z-scheme heterojunctions were successfully synthesized via self-assembly to overcome these challenges. The photocurrent, electrical impedance spectroscopy (EIS), and photoluminescence (PL) tests showed that Cu2O/1.5FePO4(CF1.5) had excellent electron hole separation efficiency. Subsequently, photocatalytic degradation was utilized as a probing technique to further confirm the above conclusions, with the kinetic reaction constants of CF1.5 being 2.46 and 11.23 times higher than those of Cu2O and FePO4, respectively. After five cycles of experiments and XPS analysis, it was found that the content of Cu(I) in CF1.5 did not significantly decrease after the reaction, indicating that it has superior anti-photocorrosion performance compared to single Cu2O, which is also due to the establishment of a Z-scheme heterojunction. Systematic studies using radical scavenging experiments and ESR tests identified ·OH and ·O2−as the main active species involved in photocatalysis. The formation of a Z-scheme heterojunction not only enhances the photocatalytic activity of the CF1.5 composite but also effectively suppresses the photocorrosion of Cu2O, thereby offering a promising approach for enhancing anti-photocorrosion of Cu2O.
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 THE AMERICAN CERAMIC SOCIETY
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2024
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IF 3.5
Mingzhang Wang,Jie Yang,Yifei Zhang,Chenyang Shao,Yan Xing
Heterojunction photocatalytic materials show great promise in hydrogen production from water decomposition under visible light. The selection of components in the heterojunction and the type of heterojunction constructed directly determine the hydrogen production efficiency. In this study, black phosphorene (BP), which has a broad visible light absorption range, and ZnIn 2 S 4 (ZIS), with a suitable band structure, are chosen to design new heterojunction photocatalysts. Through an ultrasound-assisted solvothermal method, a BP/ZIS heterojunction with a unique layered 2D/2D structure is successfully synthesized. Comprehensive characterization and calculation have elucidated the microstructure and band structure of BP and ZIS, further confirming the formation of a Z-scheme heterojunction. Such a novel BP/ZIS heterojunction exhibits a remarkable photocatalytic hydrogen evolution rate of 1317 µmol·h −1 ·g −1 , making a 3.35-fold increase compared to ZIS and superior performance over BP. This enhancement in photocatalytic activity of BP/ZIS heterojunction can be primarily attributed to the enhanced light harvesting and carrier utilization resulting from the formation of the Z-scheme heterojunction. This work provides new insights for the development of efficient photocatalysts for hydrogen production.
研究领域:
材料科学
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能源化学
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产品关联
DOI
高影响因子
ACS Applied Nano Materials
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2019
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IF 0
Yan Cheng,Navid Hussain Shah,Jian Yang,Kai Zhang,Yanyan Cui,Yaling Wang
A multicomponent Bi-based Z-scheme photocatalyst, BISB, was developed through a hydrothermal method. In this sample, two semiconducting nanostructures, BiOI and Bi2S3, were linked together with the metal Bi nanoparticle. As compared with BiOI (BI) and heterojunction BiOI/Bi2S3 (BIS) samples, the BISB had optimal Rhodamine B (RhB) photodecomposition performance. High efficiency separation of photoexcited electrons and holes, decreased band gap energy, extended specific surface area, and promotional redox potential were key factors for enhancing the photocatalytic activity of the prepared sample. The photoexcited holes were the key active radicals during the RhB photodecomposition process over the BISB catalyst, while ·O2¯ was also involved to a smaller extent. Additionally, the photocatalyst demonstrated excellent reusability and stability during the photoreaction process, suggesting that the BISB sample could be a candidate for water purification applications.
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
APPLIED CATALYSIS A-GENERAL
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2022
·
IF 5.723
Mei Su,Honggang Sun,Zhixue Tian,Zihao Zhao,Pan Li
Herein, we designed and prepared a novel two-dimensional/two-dimensional WS 2 /Bi 2 WO 6 heterostructure photocatalyst. Firstly, by first-principles calculations, we found that Bi 2 WO 6 and WS 2 could form a stable WS 2 /Bi 2 WO 6 heterostructure with a type-II band alignment structure. Supporting by the theoretical prediction, a series of WS 2 /Bi 2 WO 6 heterostructures with different amounts of WS 2 were synthesized via a facile hydrothermal method. The WS 2 /Bi 2 WO 6 heterostructures exhibited higher photocatalytic activity in degradation of rhodamine B and oxytetracycline under visible light irradiation than the pure Bi 2 WO 6 and WS 2 . And the WS 2 /Bi 2 WO 6 heterostructure had a large specific surface area and good photo-stability. The photoluminescence spectra and photoelectrochemical measurements showed that the WS 2 /Bi 2 WO 6 heterostructure possessed the ability to facilitate the separation and transfer of photo-generated carries. The active species generated in the photocatalytic system were photo-induced holes, singlet oxygen, and superoxide anion, which were verified by the trapping experiments and electron spin resonance technique. Furthermore, a Z-scheme photocatalytic mechanism 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
Materials Science and Engineering B-Advanced Functional Solid-State Materials
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2022
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IF 3.407
Lianqing Yu,Xingyu Zhao,Jiandong He,Lijie Duan,Yankun Wang,Yaping Zhang,Haifeng Zhu
It is extremely desirable to develop efficient and cheap water splitting photocatalysts. An ultrahigh performance and stable photocatalyst g-C 3 N 4 /Zn 0.5 Cd 0.5 S was prepared by simple sintering method. g-C 3 N 4 nanosheets are evenly distributed around 20–30 nm ZnCdS nanoparticles, which can accelerate carriers separation and transfer, and increase the carriers life-time from 4.1 ns to 5.5 ns. UV–vis absorption spectra demonstrate that their absorption range can reach to visible light edge of 539 nm. The photocatalyst has a high photocatalytic hydrogen evolution rate of 16.66 mmol•h −1 •g −1 under visible light illumination (λ = 400–780 nm). Furthermore, after six recycles of photocatalyst, the hydrogen evolution stability still remains 94%. The excellent photocatalytic performance is attributed to the Z-scheme energy band structure formed between g-C 3 N 4 and Zn 0.5 Cd 0.5 S by simple sintering method. This work provides significant progress toward the synthesis of cheap Z-scheme photocatalysts for practical applications.
研究领域:
材料科学
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能源化学
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DOI
高影响因子
APPLIED SURFACE SCIENCE
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2018
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IF 4.439
Lina Kong,Xintong Zhang,Changhua Wang,Jianping Xu,Xiwen Du,Lan Li
Artificial direct Z-scheme system is promising in solar-fuel production owing to their efficient charge separation and high redox capability. However, direct Z-scheme system suffers from how to construct reasonable interfacial charge transfer channel for selective charge recombination. Here we fabricate a direct Z-scheme system consisting of g-C 3 N 4 crumpled sheet with Ti 3+ -doped TiO 2 nanoparticles via polycondensation of urea with TiO 2 followed by hydrogenated treatment. UV–vis diffuse reflectance spectroscopy, X-ray photoelectron spectroscopy (XPS) and electron paramagnetic resonance (EPR) manifest that the hydrogenated treatment conferred Ti 3+ defect states below the conduction band minimum (CBM) of TiO 2 and improved visible light absorption of the g-C 3 N 4 /Ti 3+ -doped TiO 2 composite. The g-C 3 N 4 /Ti 3+ -doped TiO 2 exhibits remarkable photocatalytic performance for water splitting and degradation of pollutants than that of g-C 3 N 4 /TiO 2 , C 3 N 4 , and TiO 2 . The H 2 evolution rates of g-C 3 N 4 /Ti 3+ -doped TiO 2 reach up to 1938 and 287 μmol·h −1 ·g −1 under solar-light and visible-light irradiation, which is 3.4 and 2.8 times higher than that of g-C 3 N 4 /TiO 2 . The enhanced photocatalytic activity is ascribed to the Ti 3+ defects assistant formation of g-C 3 N 4 /Ti 3+ -doped TiO 2 Z-scheme photocatalyst, which results in efficient interfacial charge emigration and separation. Our work points out the critical role of defects in construction of Z-scheme pathways for charge transfer and provides possibilities for developing the other efficient photocatalysts.
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
SEPARATION AND PURIFICATION TECHNOLOGY
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2023
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IF 8.6
Yibing Xie,Huihui Wu,Jianfei Luo,Shao Zhang,Langlang Wang,Xueqian Wang,Yixing Ma,Ping Ning
The incorporation of vanadium during the synthesis process induced a spontaneous and complete thermal phase transition from α-Bi 2 O 3 to β-Bi 2 O 3 . This phase transition facilitated the development of intrinsic electric field at the interface between V 2 O 5 and β-Bi 2 O 3 , consequently establishing a novel carrier transfer pathway. As a result, the fabricated V 2 O 5 /β-Bi 2 O 3 heterojunction exhibited an outstanding removal efficiency of over 98 % for gaseous mercury (Hg 0 ) under UV light, and this efficiency of 95.0 % even after 35 h of testing. Introducing vanadium enhanced the light absorption capacity in the ultraviolet region and effectively separated photoinduced charge carriers. As revealed by density functional theory calculations, the photoinduced electron–hole transfer in the V 2 O 5 /β-Bi 2 O 3 heterojunction followed the Z-scheme mechanism. This mechanism significantly contributed to the long-term stability of photocatalytic Hg 0 removal, even when H 2 O and NO were present. This study presents a novel material composited by a thermal phase transition technique, aimed at the highly effective and green removal of Hg 0 in the environment.
研究领域:
环境科学
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材料科学
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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）