SEPARATION AND PURIFICATION TECHNOLOGY
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2021
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IF 7.312
Lan Yang,Yuanzhi Hong,Enli Liu,Xue Zhang,Longyan Wang,Xue Lin,Junyou Shi
The photocatalytic H 2 production simultaneous with organic pollutant degradation has been received wide attention in resolving the problems of energy crisis and environmental pollution. In this study, for the first time, the Ni 2 P (NIP) nanoparticles are successfully loaded on the surface of In 2 O 3 (INO) nanocubes, and the physical-chemical features of as-formed NIP/INO samples are comprehensively characterized by various technologies. Moreover, the photoreactivities of as-prepared NIP/INO nanocomposites are carefully investigated through the photocatalytic H 2 evolution simultaneous with dye (Rhodamine B, RhB) degradation under simulated sunlight irradiation. It was found that the as-fabricated NIP/INO nanocomposites present the significantly enhanced H 2 production and RhB degradation rates than that of pure INO nanocubes. Consequently, the optimum photocatalytic performance of as-synthesized photocatalyst is loaded by 7 wt% NIP (7-NIP/INO), whose the H 2 evolution and RhB degradation rates are reached at 0.138 μmol h −1 and 16.12%, respectively, which are 10.6-folds and 1.6-folds higher than that of individual INO, even its photoactivity is superior than the 1 wt% Pt decorated INO. The greatly improved photocatalytic performance is due to the NIP as co-catalyst can not only promote the charge carries separation and transfer efficiency, but also provide the abundant reaction active sites. Our work highlights a simple strategy for the preparation of non-noble metal nanocomposites towards the renewable solar-driven photocatalysis applications by combining with earth-abundant Ni-based co-catalyst.
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
RSC Advances
·
2015
·Vol. 5
·期 67
·54769-54776
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IF 3.84
Chunxiao Lu,Yang Chen,Yun Li,Chunhong Ma,Hongbo Zhang,Yuwei Guo,Jun Wang
A highly effective and stable up-conversion luminescence agent, Er3+:Y3Al5O12, was synthesized by sol–gel and calcination methods. Then, as a novel visible-light photocatalyst, Er3+:Y3Al5O12, Pt and PdS (as dual co-catalysts) decorated ZnS nano-sized composites, Er3+:Y3Al5O12/Pt–PdS/ZnS, were fabricated by deposition–precipitation and ultrasonic dispersion methods. All prepared samples were characterized by X-ray diffractometry (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS) and energy dispersive X-ray spectroscopy (EDX). UV-vis absorption and PL spectra of Er3+:Y3Al5O12 were also determined. The visible-light photocatalytic H2 production activity of the prepared Er3+:Y3Al5O12/Pt–PdS/ZnS was evaluated by using Na2S and Na2SO3 as sacrificial reagents in an aqueous solution under 300 W irradiation from a xenon lamp. In addition, some influential factors such as Er3+:Y3Al5O12 and ZnS mass ratio, catalyst amount, irradiation time and irradiation intensity on visible-light photocatalytic H2 production of Er3+:Y3Al5O12/Pt–PdS/ZnS were investigated in detail. It was found that Er3+:Y3Al5O12 can effectively improve the visible-light photocatalytic activity of ZnS. Particularly, Er3+:Y3Al5O12/Pt–PdS/ZnS with 0.13 wt% PdS and 0.3 wt% Pt and a 0.30 : 1.00 mass ratio shows the highest photocatalytic H2 production activity in the sulfide/sulfite (0.2 mol L−1 Na2S and 0.3 mol L−1 Na2SO3) aqueous solution as sacrificial reagents.
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
ChemCatChem
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2020
·Vol. 12
·期 21
·5504-5510
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IF 4.853
Zi-Cheng Fu,Joshua T. Moore,Zi-Xin Yang,Jia-Jun Hu,Wen-Fu Fu
Graphical CoP for photocatalysis : Sphericalmesoporous SBA-15-supported CoP nanoparticlecatalysts tuning the highly efficient photocatalytic CO-and H 2 -generating pathways with product selectivity of up to 76.3 %and 99.9 % through switching solvent, respectively, were in situ fabricated by CoP embedded on the surface and interior of the porous s-SBA-15. The highly active spherical hybrid catalysts with diameters of 3–8 μm for robust selective CO 2 photoreduction and hydrogen production by switching solvent, CoP/(i)s-SBA-15 and CoP/(o)s-SBA-15, were in situ synthesized for the first time by incorporating CoP nanoparticles on the interior and outside of the spherical mesoporous Santa Barbara Amorphous (s-SBA)-type material s-SBA-15. CoP/(i)s-SBA-15 has a larger pore diameter of ∼9.5 nm, relative to ∼5.7 nm of CoP/(o)s-SBA-15, and a calculated Brunauer-Emmett-Teller surface area of ∼214 m 2 g −1 compared with ∼336 m 2 g −1 for the latter. In comparison with bare CoP, the composites exhibited excellent catalytic CO- and H 2 -generating performance with product selectivity of up to 76.3 % and 99.9 % through switching solvents containing Ru-based photosensitizer under ambient conditions, respectively. The influences of various solvents and electron donors, as well as the amounts of H 2 O, and catalyst on reaction kinetics for CO 2 reduction and H 2 production, and intrinsic properties of both catalysts were investigated and compared.
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
Nanoscale
·
2025
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IF 5.1
Wei Zhao,Yuxiang Yang,Yanbin Li,Yimin Liu,Yuezhou Wei,Xinpeng Wang,Deqian Zeng
The advancement of efficient photocatalysts is essential for tackling global energy and environmental issues. In this work, a unique sheet-on-sheet Cd(OH)2/CdS photocatalyst was synthesized via a facile solution strategy, demonstrating significantly improved photocatalytic performance for H2 generation and Cr(VI) reduction. The optimal 5% Cd(OH)2/CdS obtained an impressive H2 production rate of 3475 μmol·g-1·h-1 under visible light, marking a 6.3 times increase compared to CdS. Additionally, the kinetics of Cr(VI) reduction were markedly accelerated, with a rate constant of 0.2803 min-1, representing a 5.7 times improvement over pure CdS. Moreover, the 2D/2D Cd(OH)2/CdS photocatalyst exhibited exceptional stability, maintaining high photocatalytic activity over multiple reaction cycles. Experimental findings and DFT calculations revealed the charge transfer mechanism between CdS nanosheets and Cd(OH)2 cocatalyst. This work provides insights into designing high-performance CdS-based nanophotocatalysts for water splitting 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
PubMed
高影响因子
ACS Sustainable Chemistry & Engineering
·
2020
·
IF 7.632
Jiaxin Li,Dandan Wang,Renquan Guan,Yujun Zhang,Zhao Zhao,Hongju Zhai,Zaicheng Sun
Photocatalysis provides a sustainable route to convert N2 to NH3 with the aid of a photogenerated electron. Beyond the typical issue in the photocatalytic field, NH3 synthesis requires adsorption, activation, and hydrogenation of N2. In this report, Ni-doped TiO2 (Ni-x-TiO2) photocatalysts were fabricated by a simple sol–gel method to introduce the oxygen defects and Ni site on TiO2. The oxygen vacancy (Vo) enhances the adsorption of N2 on the catalyst surface. The Ni doping induced a defect energy level below the conduction band, which prefers to accept the photogenerated electron. The electron captured by Vo tends to transfer to the adsorbed N2 and activate N2. On the other hand, the Ni site is a typical H2 production site. It provides enough H2 for the hydrogenation of N2 to form NH3. To sum up all of these advantages, Ni-doped TiO2 displays a high NH3 production rate of 46.80 μmol·g–1·h–1 which is about 7 times higher than that of pure TiO2. This manuscript provides a potential method to design a highly efficient photocatalyst for the NH3 synthesis.
研究领域:
材料科学
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催化
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化学工程
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环境科学
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产品关联
DOI
高影响因子
INORGANIC CHEMISTRY
·
2024
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IF 4.3
Qinxuan Cao,Jianning Feng,Jinzhong Zhang,Jie Xue,Kang Wang,Ye Yang,Haipeng Lu
Direct utilization of solar energy by semiconductor nanocrystals for chemical transformations via photocatalysis has recently drawn a great deal of attention. While most photocatalytic reactions are mediated through photoredox events, the ultimate reaction scalability relies on the use of sacrificial agents. The imbalanced population of photogenerated electrons and holes often leads to catalyst degradation through photocorrosion. To circumvent this, we designed Ni2+-doped CsPbBr3 nanoplatelets (NPls) as a “redox-neutral” photocatalyst, where both oxidative and reductive cycles occur in one photocatalyst. We showed that surface Ni2+ ions can act as an “electron shuttle” to reduce protons, generating clean-energy H2 gas, while the photogenerated holes can be used to oxidize diaryl hydrazines to afford valuable azobenzenes and derivatives. Compared with previous photocatalytic demonstrations, our catalysts show excellent reaction yields with a wide substrate scope, unity atomic efficiency, and enhanced stability and recyclability.
研究领域:
材料科学
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化学工程
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光化学
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催化
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产品关联
DOI
PubMed
高影响因子
Materials Chemistry Frontiers
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2020
·Vol. 4
·期 6
·1671-1678
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IF 6.788
Ping She,Jun-sheng Qin,Heng Rao,Buyuan Guan,Jihong Yu
Efficient charge separation and light harvesting of photocatalysts (e.g., TiO2) are the key issues to be considered in the design of solar-energy conversion systems. In particular, the charge separation of noble metal-decorated TiO2 materials could be greatly improved via decreasing the size of noble metal particles (NPs). Furthermore, designing specific morphologies such as hollow structures can improve light harvesting ability. Herein, a hybrid hollow TiO2 with spatially separated bimetals (Pd@TiO2@Au) was prepared, which demonstrated enhanced charge separation. By choosing zeolite as the sacrificial substrate, ultrasmall Pd NPs and Au NPs were decorated in the inner and outer shells of hollow TiO2, respectively. The separated bimetals could pull the photoexcited electrons away from the surface of TiO2 for more efficient charge separation. The as-prepared Pd@TiO2@Au catalyst exhibited a superior photocatalytic H2 evolution rate up to 272.3 μmol h−1, which was higher than most of the TiO2-based photocatalysts.
研究领域:
材料科学
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光催化
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太阳能转换
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DOI
高影响因子
Journal of Materials Chemistry A
·
2019
·Vol. 7
·期 8
·3828-3841
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IF 10.733
Jia Jia,Qiqi Zhang,Zong Li,Xiaoyun Hu,Enzhou Liu,Jun Fan
Two-dimensional (2D) layered heterostructures have attracted substantial attention in recent years as promising platforms for the direct conversion of renewable solar energy to chemical fuels due to their unique optoelectronic, transport, and interfacial properties. The rational structural design and tailored synthesis of semiconductor heterojunctions are critical to explore and achieve well-defined photocatalytic systems. Herein, we propose a design strategy for ultrathin 2D FeS–FeSe2 lateral heterostructures to achieve rapid spatial migration of photogenerated charge carriers and to facilitate favorable kinetics of target surface redox reactions for photocatalysis. The resultant composites have superior photocatalytic H2 generation activity (2071.1 μmol g−1 h−1) without any noble metal as a cocatalyst under sunlight and show marked photocatalytic durability after a continuous test for 20 h under alkaline conditions. In particular, we have found, for the first time, that the irradiated FeS–FeSe2 is active for producing H2O2 by the two-electron reduction of O2 in the photocatalytic degradation process of phenol solution. A series of mechanistic studies on photocatalysis clearly demonstrates that the pronounced photocatalytic performance of the 2D lateral heterojunction nanosheets could be a result of increased carrier density, longer electron lifetime and higher hole injection efficiency as well as a stepwise two-electron/two-step reduction pathway.
研究领域:
材料科学
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纳米技术
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光催化
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可再生能源
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）