JOURNAL OF ELECTRONIC MATERIALS
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2016
·Vol. 46
·期 2
·999-1004
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IF 1.491
Huang Zhengfeng,Cheng Xudong,Dong Peimei,Zhang Xiwen
To mitigate the greenhouse effect, many studies have been carried out to improve the CO 2 conversion efficiency of TiO 2 . Modification of TiO 2 has been intensively investigated, but the influence of an electric field on photoreduction by this material remains largely unknown. Accordingly, in this study, we explored the effect of an electric field on the photoreduction process using a porous TiO 2 -Ti material. The results indicated that the CO yield improved 85-fold (equivalent to 4772 μ mol/g h) when a 30-kV voltage was applied during the reduction process. To make the electric field effect fully functional, we also explored the effect of water on the photoreduction process, finding that TiO 2 showed the highest conversion rate when the humidity was controlled at 50% relative humidity (RH).
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
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2024
·
IF 9.4
Shujie Liang,Yan Zhang,Jingxian Cong,Jiaxin Lv,Hong Deng
Designing and fabricating nanozymes with photoactivity for CO 2 reduction poses a significant challenge. Here, a hierarchically structured ZFs-tpyNi heterojunction nanozyme, comprising a terpyridine-based Ni complex supported on ZrO 2 nanoframes, has been created through an interfacial engineering strategy for efficient CO 2 reduction under visible light. Due to its unique structural and compositional advantages, ZFs-tpyNi demonstrates superior photocatalytic CO 2 -to-CO conversion compared to its counterpart of ZFs and tpyNi, achieving a CO yield of 18.2 µmol and a selectivity of 92.4 % with a high apparent quantum efficiency of 0.96 % in 3 h. These innovative catalysts also show excellent durability for at least eight cycles without a loss in performance, maintaining a remarkable structural stability with no obvious collapse of its framework and morphology. Systematic investigations reveal that ZFs-tpyNi heterostructures exhibit a high specific surface area advantageous for the effective loading of tpyNi and exposure of active sites. The robust ZFs framework, characterized by extensive porosity, prevents nanoparticle agglomeration and accelerates mass transfer during catalysis. Additionally, the spatially heterogeneous interface enables precise modulation of band alignment and bandgap dynamics in nanozymes, enhancing light absorption and promoting the generation and separation of photogenerated charge carriers. Consequently, the nanozyme demonstrates enhanced CO 2 adsorption and activation capabilities, leading to improved selectivity of catalytic products. This work aims at highlight the role of nanozyme catalysts in sustainable energy production.
研究领域:
材料科学
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催化化学
·
环境科学
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产品关联
DOI
PubMed
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2022
·
IF 24.319
Zesheng Deng,Songchang Hu,Jiahui Ji,Shiqun Wu,Haijiao Xie,Mingyang Xing,Jinlong Zhang
Cu is widely used to prepare high-value products in photocatalytic CO 2 reduction reaction (CO2PR). The valence state of transition metals usually has a great impact on the catalytic process. However, the research on Cu valence in CO2PR is lack for its complex valence change. In current work, Cu x /P25 with stable Cu valence composition in CO2PR is prepared. The results show that Cu is composed of Cu 0 and Cu 2 O, and their proportions change regularly as Cu loading changing, which are linearly related to the selectivity of the corresponding products of CO2PR. Combined with thermodynamic and kinetic analysis, the CO adsorption and activation on the surface of Cu 0 and Cu 2 O are considered to be the key to determine the product of CO2PR, which is further confirmed by DFT calculation. Cu 0 and Cu 2 O are proved to be active site of producing CH 4 and CO, respectively. In this case, a reference for the study of highly selectivity Cu based photocatalysts is provided.
研究领域:
材料科学
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催化化学
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DOI
高影响因子
Journal of CO2 Utilization
·
2018
·
IF 5.503
Zhengfeng Huang,Peimei Dong,Yanzhao Zhang,Xiaoxiao Nie,Xiya Wang,Xiwen Zhang
A strategy of coupling a photocatalyst with a high CO 2 adsorption capacity material was proposed in order to integrate CO 2 capture and photoreduction processes into a single system. TiO 2 and ZIF-8 were selected for their high photoactivity and CO 2 adsorption capacity respectively. We employed a facile in-situ growth strategy to inlay ZIF-8 into the TiO 2 film grid. X-ray diffraction and scanning electron microscopy revealed that ZIF-8 was successfully prepared and inlaid into the TiO 2 film. X-ray photoelectron spectroscopy and photoluminescence spectra suggested that the TiO 2 and ZIF-8 were coupled by chemical bonding. The ZIF-8 decorated TiO 2 film exhibited excellent CO 2 capture capacity and showed remarkably enhanced yield for reducing CO 2 to CO and CH 4 when compared with pure TiO 2 film. The probable mechanism of the photoreduction process is also discussed.
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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DOI
高影响因子
MATERIALS RESEARCH BULLETIN
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2017
·
IF 2.446
Xiaojuan Zhao,Hongda Cui,Tianhe Wang
We report a novel Bi 2 Sn 2 O 7 /Ag-AgCl photocatalysts with excellent visible-light-driven photocatalytic properties. The crystalline Bi 2 Sn 2 O 7 was synthesized by solid-state reaction at 550 °C. Then Bi 2 Sn 2 O 7 /Ag-AgCl was prepared using deposition-precipitation technique followed by photo-reduction of partial Ag + to Ag 0 nanoparticles on surface of AgCl. The photocatalysis were evaluated by degrading organic dyes under controlled conditions. The Bi 2 Sn 2 O 7 /Ag-AgCl composite exhibited a much improved photocatalysis, approximately 7 times stronger than that of pure Bi 2 Sn 2 O 7 , primarily due to its enhanced visible-light absorption and high separation efficiency of charge. On the basis of band structure analysis, a possible mechanism of photocatalysis enhancement for Bi 2 Sn 2 O 7 /Ag-AgCl is proposed. The strong photocatalytic capability, together with simplicity of fabrication suggests Bi 2 Sn 2 O 7 /Ag-AgCl composite provided in this study may have certain practical applications in water treatments. Additionally, the study implies a novel but simple methodology that may be also applicable in construction of other types of single semiconductor/plasmonic composite 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
CHEMOSPHERE
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2020
·
IF 5.778
Min Liu,Xinyu Gao,Fei Pan,Yuwei Deng,Dongsheng Xia,Zhang Li,Jie Fu
This work reported the role of pyrene in formation of naturally occurring silver nanoparticles (AgNPs) via the reduction of silver ions by humic acid under the UV irradiation in the aquatic environment. An increase in temperature (25–90 °C), pH (5–9) or concentration of humic acid (2.5–15 mg/L) led to an enhanced formation of AgNPs. The TEM images indicated the formed AgNPs were spherical with an average particle size of ∼20 nm. Pyrene showed a limited capacity for the photoreduction of silver ions, and when both pyrene and humic acid were present, pyrene would compete with humic acid for the reduction of silver ions. However, the presence of pyrene would enhance the stability and suppress the antibacterial activity of natural AgNPs. The UV–vis spectra of AgNPs suspensions generated with pyrene did not change within 45 days. The inhibition rates against Escherichia coli of AgNPs generated with pyrene were 8–32% lower than those of AgNPs generated without pyrene. This study provides environmental implications on the fate and ecotoxicity of natural AgNPs with interaction of polycyclic aromatic hydrocarbons .
研究领域:
环境科学
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纳米生物学
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DOI
高影响因子
Catalysts
·
2021
·Vol. 11
·期 2
·174
·
IF 4.146
Jing Zhang,Li Wang,Wenwen Liu,Mengsha Cao,Jing Zhang,Ningyi Yuan,Shuai Zhang,Zhongze Gu
The surface modification of perovskite nanocrystals (NCs) (i.e., their decoration with noble metals) holds great promise with respect to the tailoring of their properties but has remained a challenge because perovskite NCs are extremely sensitive to water and alcohols. In this study, Au or Pt@CsPbBr3NCs were successfully synthesized by photoreduction at the water/hexane interface. First, Cs4PbBr6NCs were synthesized through the hot-injection method. Then, Cs4PbBr6was transformed into CsPbBr3and subjected to noble metal modification, both at the interface. The synthesized CsPbBr3NCs exhibited a cubic perovskite phase and had an average size of approximately 13.5 nm. The deposited Au and Pt nanoparticles were crystalline, with a face-centered cubic lattice and average diameters of approximately 3.9 and 4.4 nm, respectively. The noble metal modification process had almost no effect on the steady-state photoluminescence (PL) emission wavelength but affected the charge-recombination kinetics of the CsPbBr3NCs. Time-resolved PL decay spectral analysis indicated that the fluorescence lifetimes of the Au and Pt@CsPbBr3NCs were shorter than those of the pure CsPbBr3NCs, probably owing to the quenching of the free charges because of electron transfer from the perovskite to the noble metal nanoparticles.Keywords:perovskite nanocrystals;noble metal;interface;photoreduction
研究领域:
材料科学
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化学
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产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2024
·Vol. 12
·期 16
·9871-9885
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IF 10.7
Longyan Chen,Pengkun Zhang,Dong-Hau Kuo,Jianmei Jiang,Binghong Wu,Zhengjie Su,Osman Ahmed Zelekew,Jinguo Lin,Dongfang Lu,Xiaoyun Chen
Herein, we demonstrate a Co/S doped TiO2 bimetal sulfur oxide nanoparticle catalyst (labeled CoTiOS) with heterovalent Co states and abundant oxygen vacancy (Ov) defects for the photocatalytic nitrogen reduction reaction (PNRR) in an ambient environment. Co/S co-doping converted TiO2 into a catalyst for visible light photocatalytic nitrogen fixation. The incorporation of Co endows TiO2 with better electrical conductivity and electron trapping ability. The introduction of sulfur adjusts the amount of Ov and Co3+/Co2+ ratio. Ov acts as an active site for trapping H2O and activating H2O to generate a proton for the N2 reduction reaction. Active atoms Co3+ were exposed and activated for N2, and electrons hopping between Co2+ and Co3+ enhanced electron transfer. CoTiOS-3 with appropriate Co/S doping has abundant Ov, suitable heterovalent Co3+/Co2+ ratios, higher surface active sites, smaller crystal sizes, higher specific surface area (SBET), and fast transfer of electrons, and it exhibited a super PNRR activity of 491.56 μmol g−1 h−1, an apparent quantum efficiency (AQE) of 1.89% at 420 nm and a solar-to-ammonia (STA) conversion efficiency of 0.083% in pure water under AM1.5G light irradiation. It also exhibited excellent stability and persistence and shows potential for photocatalytic nitrogen fixation.
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 Water Process Engineering
·
2025
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IF 6.7
Xingkun Liang,Keng Xie,Jun Cai,Zengxu Yang,Kongzhai Li
Hexavalent chromium (Cr(VI)) has long been recognized as a significant threat to human health and ecosystems. However, achieving the rapid and efficient reduction of Cr(VI) to the non-toxic Cr(III) by using conventional photocatalysts remains a challenge. While polyethylene glycol (PEG) is widely used as a photoreductant for Cr(VI) reduction, the core factors influencing the Cr(VI) reduction reaction and underlying mechanisms have not been thoroughly explored. In this study, we examined the effects of different factors on the photoreduction of Cr(VI) by PEG. Experimental results reveal that PEG-2000 exhibits the strongest photoreduction capability. Moreover, the optimum pH for photoreduction is 0.5, while the most favorable temperature is 30 °C. Furthermore, the intermediates and photo-induced mechanism of Cr(VI) photoreduction by PEG were analyzed. The photoreduction reaction proceeds following the formation of a complex between PEG and Cr(VI). This complex absorbs light energy, facilitating the rapid transfer of electrons from the excited oxygen clusters to chromic acid. Both ∙O 2 − and ∙OH radicals are involved in the photoreduction process, and radical trapping experiments confirm that electrons are the primary contributors to the reduction. This study provides a comprehensive investigation into the mechanism of Cr(VI) reduction by PEG, offering valuable insights into the practical application of photoreductants in catalytic reduction processes.
研究领域:
环境科学
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化学
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产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
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2025
·
IF 19
Wenchao Shangguan,Guoqiang Li,Shidi Gui,Xiaodong Zhang,Sugang Meng,Shifu Chen,Yingxuan Li
Separating photoexcited holes in metallic nanostructure to drive H 2 O oxidation reaction to balance the CO 2 photoreduction reaction is highly desirable, but challenging. The bottleneck lies in the sluggish kinetics of both photoexcited hole transfer and H 2 O oxidation. Herein, this work demonstrates that the in situ reconstruction of n -type wide-bandgap AlOOH-supported Au nanoparticle heterogeneous photocatalyst, triggered by thermal and photothermal cooperative effect during photocatalytic reactions, facilitates the efficient CO 2 photoreduction through optimizing the Au 5 d -band holes separation and H 2 O activation. In situ and ex situ characterizations evidence restructuring at interfaces to form an ultrathin γ-Al 2 O 3 nanolayer (≈2 nm thickness), which optimizes the energy band structure and promotes spontaneous transfer of photoexcited Au 5 d -band holes to the valence band of AlOOH, and prolongs the lifetime of electrons available for CO 2 reduction on Au. Furthermore, hydroxyl vacancies generated during restructuring process are demonstrated to promote H 2 O adsorption and lower the energy barrier for O 2 formation, supplying adequate protons for CO 2 protonation reduction and thereby boosting CO 2 photoreduction efficiency. This study offers valuable insights into the underlying mechanisms of utilizing n -type semiconductors to separate photoexcited d -band holes in metal nanoparticles.
研究领域:
材料科学
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催化化学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
CHINESE JOURNAL OF CHEMISTRY
·
2021
·Vol. 39
·期 5
·1310-1318
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IF 6
Jingyu Zhao,Yaru Li,Ping Na
Main observation and conclusion We reported a facile and green hydrothermal strategy to tailor the carbon dots layer (CDL) and oxygen vacancies (Vo) modified on TiO 2 , by using ascorbic acid as CDL precursor and Vo regulator. The amorphous CDL was uniformly coated on the surface of the as prepared CDL@TiO 2– x composites by Ti-O-C bond. With the increase of carbon content, the amorphous CDL gradually became thicker, while the Vo concentration first increased and then decreased. 1.5 CDL@TiO 2– x possessed the highest Vo concentration. With the decoration of CDL and Vo, the photoreduction properties of CDL@TiO 2– x composites were significantly improved. Under simulated solar light and visible light, the reaction rates of 1.5 CDL@TiO 2– x were 9.6 times and 216 times higher than that of pure TiO 2 , respectively. Interestingly, the results discovered that CDL and Vo influenced the properties of CDL@TiO 2– x composites in different ways. The primary function of CDL was to improve the utilization of solar light, and the enhancement of the charge transfer ability was decided by Vo and CDL together. Our work provides a new strategy for the modification of TiO 2 and sheds new light on the respective role of CDL and Vo when they coexist in the catalyst.
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
Jove-Journal of Visualized Experiments
·
2019
·
IF 1.108
XiaoXiang Fang,Zhihong Gao,Hanfeng Lu,Qiulian Zhu,Zekai Zhang
We demonstrate a method for the enhancement of CO2 photoreduction. As the driving force of a photocatalytic reaction is from solar light, the basic idea is to use concentration technology to raise the incident solar light intensity. Concentrating a large-area light onto a small area cannot only increase light intensity, but also reduce the catalyst amount, as well as the reactor volume, and increase the surface temperature. The concentration of light can be realized by different devices. In this manuscript, it is realized by a Fresnel lens. The light penetrates the lens and is concentrated on a disc-shaped catalyst. The results show that both the reaction rate and the total yield are efficiently increased. The method can be applied to most CO2 photoreduction catalysts, as well as to similar reactions with a low reaction rate at natural light.
研究领域:
环境科学
·
能源化学
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产品关联
DOI
PubMed
高影响因子
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