JOURNAL OF MOLECULAR STRUCTURE
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2022
·
IF 3.841
Yuqin Wei,Yan Chen,Rui Yuan,Zhaoli Xue,Long Zhao
Porphyrin-sensitized semiconductor particles can intensely absorb light in the visible wavelength range. Modification on molecular structure by either tuning the substituent species or elongating the distance between the second chromophore and porphyrin core may reduce interfacial electron-hole recombination and thus improving photocatalytic activity. Two zinc porphyrins are synthesized and doped on TiO 2 for photodegrading an organic pollutant AB1. Electronic structure of the molecules is studied by density functional theory calculations, showing more delocalized electron density on TPA-BiPh-ZnP than Cb-Ph-ZnP . Photo-electrochemical impedance measurements suggest greater electron-hole separation and interfacial charge transport efficiencies of TPA-BiPh-ZnP/TiO 2 than Cb-Ph-ZnP/TiO 2 . Both composites perform promising photodegradation activity of AB1, with superoxide radicals (•O 2− ) and holes (h + ) as the major reactive species at the reaction interfaces. Importantly, TPA-BiPh-ZnP/TiO 2 exhibits faster degradation kinetics than Cb-Ph-ZnP/TiO 2 , reaching a C/C 0 value of 10% within 60 min.
研究领域:
材料科学
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环境科学
·
化学
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DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2020
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IF 16.683
Han Zhang,Zhaoming Luo,Yalun Liu,Yuwen Jiang
In this study, Ni 3 C nanoparticles (NPs) were loaded on LaNiO 3 NPs as a co-catalyst during the photocatalytic H 2 evolution. The evolution rate of the LaNiO 3 -3 wt%Ni 3 C composite (4093.9 μmol g −1 h −1 ) is about 5 times and 2 times as that of pristine LaNiO 3 NPs (819.2 μmol g −1 h −1 ), and 1 wt% Pt loaded LaNiO 3 NPs (1927 μmol g −1 h −1 ). The effects of co-catalyze with Ni 3 C on light absorption, electron-hole spatial separation, and surface H 2 -evolution kinetics are investigated. Loading with Ni 3 C can enhance the spatial separation of electron-hole pairs, and improve the H 2 -evolution kinetics. Further investigation shows that surface decomposition of LaNiO 3 NPs can only be observed when the Ni 3 C content is over 3 wt%, caused by the reductive carbon source needed in the loading process. This work indicates that transition metal carbide can be a promising co-catalyst candidate for oxides in photocatalytic applications without concerning corrosion from the reductive carbonaceous precursors in the loading process.
研究领域:
材料科学
·
光催化
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产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2017
·
IF 9.446
Zizheng Ai,Gang Zhao,Yueyao Zhong,Yongliang Shao,Baibiao Huang,Yongzhong Wu,Xiaopeng Hao
CdS is a photocatalyst known for its desirable bandgap and availability but it is limited by photocorrosion and inefficiency issues in practical applications. According to band engineering theory, regulating the width of bonding region that exists between cubic phase and hexagonal phase, we design a suitable phase junction and achieve effective separation of electron-hole pairs. Thus, the problems caused by photocorrosion and phase exclusion can be resolved. The optimal photocatalytic activity of the prepared material is 4.9 mmol h −1 g −1 with 41.5% quantum efficiency at the wavelength of 420 nm, which is 60 times higher than that of the initial samples (cubic or hexagonal phase), and keeps high photocatalytic stability. This novel construction approach can be useful in designing ideal band structures and matching the phase bandgap of other binary sulfides.
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
高影响因子
Journal of Materials Chemistry C
·
2024
·Vol. 13
·期 1
·295-305
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IF 5.7
Yanan Gao,Jingjing Wang,Jingxuan Yang,Yajie Wang,Wenjuan Tian,Bin Liu
Nitrogen-rich graphitic carbon nitride (g-C3N5) has garnered significant attention in photocatalytic hydrogen production due to its unique physicochemical properties. However, g-C3N5 faces persistent challenges stemming from rapid carrier recombination. In this study, we successfully synthesized a Pd/C3N5-K,I photocatalyst through sequential doping of non-metallic heteroatoms and metal nanoparticles. The Pd/C3N5-K,I photocatalyst demonstrates a remarkable enhancement in the photocatalytic H2 evolution rate (2.9 mmol g−1 h−1), approximately 14 times higher than that of pure g-C3N5 (0.2 mmol g−1 h−1). Characterization and calculation analyses reveal that iodine doping into the g-C3N5 skeleton leads to the formation of planar C–I bonds, facilitating C3N5 layer electron–hole pair separation. The subsequent insertion of Pd nanoparticles between the layers leads to electron accumulation on C3N5-K,I, while resulting in hole concentration on Pd nanoparticles, thereby facilitating thorough spatial separation of electron–hole pairs. The strategic co-doping of iodine and palladium nanoparticles effectively restrains carrier recombination of g-C3N5 by connecting intra- and inter-layer interactions. This study constitutes a novel conceptual framework for CN-based photocatalysts, offering a promising approach to improve their performance in hydrogen production applications.
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
高影响因子
RSC Advances
·
2017
·Vol. 7
·期 5
·2943-2952
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IF 3.108
Jia Yang,Xiaojun Niu,Shaorong An,Weiyi Chen,Jie Wang,Wei Liu
A novel Bi2MoO6–MIL-100(Fe) heterostructure photocatalyst was synthesized by a facile solvothermal method for the first time, and characterized by X-ray diffraction, scanning electron microscopy, X-ray photoelectron spectroscopy, UV-vis diffuse reflectance spectra, transmission electron microscopy, and photoluminescence spectra. The as-prepared Bi2MoO6–MIL-100(Fe) composites exhibited excellent photocatalytic activity and stability towards the degradation of Rhodamine B (RhB) under visible light irradiation. The introduction of MIL-100(Fe) into semiconductor Bi2MoO6 improved the photocatalytic performance remarkably, and the optimal composite with 9% MIL-100(Fe) content showed the highest photocatalytic activity. According to the active radical trapping experiments, the h+ and ˙O2− radicals were the two main active species in the photocatalytic reaction. The enhanced photocatalytic performance is mainly attributed to the formation of the Bi2MoO6–MIL-100(Fe) heterostructure, which is beneficial to the transfer and separation of photo-generated electron–hole pairs. The possible mechanism of the enhanced photocatalytic performance of the Bi2MoO6–MIL-100(Fe) composites was discussed.
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
Scientific Reports
·
2019
·Vol. 9
·期 1
·1-11
·
IF 4.011
Wang Linjuan,Zan Ling
Compositing nanoparticles photo-catalyst with enormous surface areas metal–organic framework (MOF) will greatly improve photocatalytic performances. Herein, WO 3 nanoparticles are partly embedded into pores of MIL-101 or only supported on the outside of representative MIL-101, which were defined as embedded structure WO 3 @MIL-101@WO 3 and coating structure WO 3 &MIL-101 respectively. Different pH, concentration and loading percentage were researched. XRD, TEM and BET were carried to analyze the composites. Compared with the pristine WO 3 , all WO 3 loaded MOF nanocomposites exhibited remarkable enhancing for the efficiency of photocatalytic degradation methylene blue under visible light. Their activity of the same loading percentage WO 3 in embedded structure and coating structure have increased for 9 and 3 times respectively compared with pure WO 3 . The WO 3 @MIL-101@WO 3 has 3 times higher efficiency than WO 3 &MIL-101, because the shorter electron-transport distance can make a contribution to electron–hole separation. The further mechanism involved has been investigated by radical quantify experiment, XPS and photoluminescence spectroscopy.
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
APPLIED SURFACE SCIENCE
·
2023
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IF 6.7
Yubao Li,Hanke Li,Shuang Li,Ming Li,Ping He,Yao Xiao,Jiufu Chen,Yafen Zhou,Tongyan Ren
Photocatalytic water splitting for hydrogen evolution is viewed as a promising strategy to address the energy and environmental issues. In this study, a series of NiO/Zn 3 In 2 S 6 (NiO/ZIS 6 ) p-n heterojunction photocatalysts have been prepared by the facile ultrasonic assisted deposition method. The as-obtained samples were systematically characterized employing various testing techniques. The photocatalytic performance of the p-n photocatalysts were evaluated by photocatalytic hydrogen production and the effect of different mass ratios of NiO to ZIS 6 on photocatalytic hydrogen evolution performance was also explored. The results indicated that the 25% NiO/ZIS 6 sample demonstrates optimal photocatalytic hydrogen evolution activity with a hydrogen evoluton rate of 21.79 mmol g −1 h −1 , which is 7.65 times higher than that of ZIS 6 . The mechanism exploration proves that the formation of NiO/ZIS 6 p-n heterojunction effectively promotes the separation and migration of photoinduced electrons and holes. Meanwhile, the recombination of charge carriers was restrained observably. This work may shed light on the design and preparation of novel p-n heterojunction photocatalysts with efficient photocatalytic hydrogen evolution performance and high stability.
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
NANOTECHNOLOGY
·
2023
·Vol. 34
·期 47
·475701
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IF 3.5
Jiayu Ma,Xu Jin,Mengjuan Yang,Ximeng Zhao,Shanshan Ding,Bin Wang,Xiuyan Li
In this research work, a reusable and efficient 2D/1D heterogeneous structured photocatalyst based on amine-functionalized halloysite nanotubes (MHNTs) and Bi2WO6 nanosheet (BWO) was prepared using a facile hydrothermal method for decomposing PPCPs under simulated sunlight. On the degradation of tetracycline hydrochloride (TCH), the effects of composite catalysts prepared under various conditions were discussed. The results showed that over BWO/MHNTs with a mass ratio was 3:1, the synthesizing temperature was 120 °C and the precursor pH value was 1, the TCH (10 mg l−1) degradation efficiency reached 100% after 1 h irradiation of simulated sunlight. Moreover, BWO/MHNTs composites kept good recovery and stable photocatalytic activity after 5 cycles. The excellent dispersion of Bi2WO6 on the surface of clay minerals and the oxygen vacancy enhanced electron–hole separation may be responsible for the its high activity and stability. Futhermore, the radical capture test demonstrated that ·O−2 was primarily responsible for the photodegradation of TCH. Thus, BWO/MHNTs composites exhibit a good application prospect in the field of sunlight-driven photocatalytic degradation towards PPCPs pollutants in water.
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
Carbon Capture Science & Technology
·
2021
·
IF 0
Yuxin Mei,Nicui Yuan,Yuwei Liu,Xin Zhang,Baining Lin,Yonghua Zhou
Boron carbon nitride (BCN) is an emerging metal-free catalyst for CO 2 photocatalytic reduction. However, the fast electron-hole recombination as well as the weak absorption for ultraviolet-visible (UV-vis) light are still challenging for the activity upgrading of BCN. In this paper, a BCN/CeO 2 heterostructure via N-O-Ce bonding was fabricated by a urea-assistant heat-precipitation technique and confirmed by XRD, FT-IR, SEM, TEM and XPS characterizations. For CO 2 photoreduction with H 2 O as reducing agent, the BCN/CeO 2 heterostructure delivered an obviously enhanced catalytic performance with CO yield of ca. 6-fold that of BCN. UV-vis diffuse reflectance spectrophotometer (DRS), electrochemical impedance spectroscopy (EIS) and transient photocurrent response measurements revealed that the electron-hole separation efficiency and charge transfer are efficiently promoted on CeO 2 /BCN heterostructure, along with the boosted light harvesting in visible and ultraviolet light range. Furthermore, based on the photo(electro)chemical and photocatalytic results, a possible CO 2 photocatalytic reduction mechanism was proposed.
研究领域:
材料科学
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环境科学
·
化学
✓ 已验证
DOI
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Hongmei Chen,Yanyun Fan,Kexin Shi,Peng Wang,Chong-Chen Wang
It is of great significance to develop an efficient and stable photocatalyst for the photocatalytic decomposition of water to produce hydrogen. Within this paper, an effective and simple strategy was adopted to introduce pyrazine ring into graphite-like carbon nitride framework to realize efficient and stable hydrogen production process. After evaluation, the hydrogen production efficiency of the modified semiconductor material is 3.05 folds higher than the unmodified graphite-like phase carbon nitride, and an excellent stability performance was also achieved. It is proved that the light absorption ability of doped semiconductor composite nanomaterials was enhanced markedly by introducing 2-aminopyrazine into the carbon nitride structure. Meanwhile, the segregation efficiency of photo-induced carriers was obviously accelerated because the amino groups can work as hole trapping agents. Additionally, the introduced amino groups own Lewis alkalinity, which is in favour of the photoreduction. This work expands a new perspective of stable photocatalysts in the water split to produce hydrogen.
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
ENERGY & FUELS
·
2022
·
IF 4.654
Wei Zhang,Jie Zhao,Ahmed A. Allam,Yue Xin,Jingqi Lin,Ting Gao,Jamaan S. Ajarem,Ximing Li,Chuanyi Wang,Detlef W. Bahnemann
Bi2WO6 is a promising photocatalyst for NOx removal, owing to its wide solar light absorption and specific photoelectric properties. Nevertheless, enhancing its efficiency remains a major concern. Palladium proves to be a good co-catalyst for semiconductor materials, but how the combination of Pd and bismuth tungstate affects the efficiency of NO removal and relevant process is still vague. In this work, nutshell-like bismuth tungstate was synthesized using a hydrothermal method, followed by photo-depositing Pd nanoparticles with different contents. The obtained photocatalysts were characterized by X-ray diffraction, specific surface area analyzer (BET), X-ray photoelectron spectroscopy, and scanning electron microscopy. Among the prepared photocatalysts, Bi2WO6 deposited with 1 wt % Pd shows the best photocatalytic activity with a NO removal efficiency of 58%, which is 2.9 times that of the Bi2WO6 under the same conditions. The enhanced photocatalytic activities were attributed to the comprehensive effects of the high efficiency in separating electrons and holes, improvement in invisible light utilization and BET specific surface areas of Pd–Bi2WO6 nanocomposites. More importantly, it was found that NO2 is the main product over Bi2WO6, whereas the conversion of NO to NO3– (an environmentally friendly product) is dominant over Pd-modified Bi2WO6 due to the enhanced separation of electrons and holes. Active species capture experiments show that photo-generated holes (h+) and •O2– play an important role in NO removal. The present work provides new insights into the role of Pd cocatalysts in NO removal.
研究领域:
材料科学
·
环境科学
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产品关联
DOI
高影响因子
Water Research X
·
2025
·
IF 8.2
Hong Tu,Bihong Tian,Zhichao Zhao,Renjiang Guo,Ya Wang,Shunhong Chen,Jian Wu
The structural modulation of pristine graphitic carbon nitride poses a considerable challenge in the rational design of catalysts for the efficient degradation of small organic pollutants under visible light. In this study, we combined first-principles calculations and the structure-function relationship to predict a high-performance catalyst. The results reveal that CN-8 demonstrates a remarkable degree of electron-hole separation. Notably, CN-8 shows exceptional degradation efficiency towards rhodamine B, tetracycline, bisphenol A, and fluralaner under visible light irradiation. Specifically, the degradation rate constants are 11, 4, 12, and 32 times higher, respectively, compared to bulk g-C 3 N 4 . Through density functional theory calculations and investigations of the structure-function relationship, it is confirmed that the superior catalytic activity of CN-8 lies in modifying the amino position, which alters the electron cloud distribution and promotes the efficient separation of photo-generated electron-hole pairs. This study provides valuable insights for the development of eco-friendly and efficient photocatalysts for environmental remediation.
研究领域:
环境科学
·
材料科学
✓ 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）