Catalysts
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2024
·Vol. 14
·期 6
·335
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IF 3.8
Peng Jiang,Yang Yu,Kun Wang,Wenrui Liu
Excessive emissions of carbon dioxide have led to the greenhouse effect and global warming. Reducing carbon dioxide into high-value-added chemicals through solar energy is a promising approach. Herein, a g-C3N4/TiO2heterojunction photocatalyst with efficient electron transfer is designed for photocatalytic CO2reduction. The CH4(18.32 µmol·h−1·g−1) and CO (25.35 µmol·h−1·g−1) evolution rates of g-C3N4/TiO2are higher than those of g-C3N4and TiO2. The enhanced photocatalytic CO2reduction performance is attributed to the efficient charge carrier transfer in the g-C3N4/TiO2heterojunction. The electron transfer route was verified by in situ irradiated X-ray photoelectron spectroscopy (XPS). The photocatalytic CO2reduction mechanism on g-C3N4/TiO2was investigated by in situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS). This work provides a strategy for designing a polymer/metallic oxide heterojunction with efficient electron transfer for enhanced photocatalytic CO2reduction.
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
产品关联
DOI
高影响因子
Journal of Physical Chemistry C
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2024
·
IF 3.3
Linjing Hao,Weiqi Zhang,Peng Li,Jing-He Yang,Jie Zhang
TiO2/BiOCl heterojunction photocatalysts were synthesized from different exposed facets (BiOCl(010) and BiOCl(001)). Both heterojunctions had higher photocatalytic activity than their respective components. The favorable energy band shifts constructed an efficient Z-scheme TiO2/BiOCl heterostructure photocatalytic system, which significantly reduced recombination and accelerated the separation rate of photogenerated carriers. Due to the different electrostatic fields inside the crystal planes of BiOCl, electrons migrate from BiOCl to the TiO2 surface through different transport paths, resulting in the charge transport distance of photogenerated electrons in BiOCl(010) being shorter than that in BiOCl(001), and the electron loss was lower. Therefore, TiO2/BiOCl(010) had a higher photocatalytic activity. Besides, the photocatalytic oxidization mechanism was proposed, TiO2/BiOCl(010) oxidizing NOF mainly via photogenerated h+, while TiO2/BiOCl(001) oxidizing NOF through h+ and ·OH. This study contributes to an in-depth understanding of the charge transfer behavior in the TiO2/BiOCl heterojunction structure and provides a reference for the design of efficient heterojunction photocatalysts.
研究领域:
材料科学
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环境科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Catalysis
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2024
·
IF 11.3
Hang Yu,Shanjun Mao,Bing Lu,Hao Wang,Xie Zhang,Menghui Qi,Ruiliang Gao,Yong Wang
Multicomponent reactions such as ammoxidation are highly desirable for chemical synthesis. The complicated reaction network and catalytic active sites involved, however, make it rather challenging for extensive structure–performance relationship investigations and subsequent rational design of an efficient catalyst. In this work, efficient VOx/TiO2 catalysts with concise components and exquisite structure design demonstrated 95% selectivity at 98% conversion under 2070 h–1 for 3-picoline ammoxidation. After clarifying that the oxidative dehydrogenation process is rate-limiting, we assumed that the abundance of reactive surface lattice oxygen at the interface of vanadium–titanium is the key to high productivity and suppression of oxidation side reactions since low reaction temperature is beneficial for enlarging the difference in rates of different energy barriers. In addition, rather than applying the traditional neutralization method with alkaline components, in situ formed V2O5 crystallite was subtly to cover the strong acid sites on VOx/TiO2 catalysts in that the strong adsorption of pyridine nitrogen in 3-cyanopyridine on strong acid sites can lead to severe hydrolysis side reactions.
研究领域:
催化化学
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材料科学
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产品关联
DOI
高影响因子
RSC Advances
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2015
·Vol. 5
·期 68
·55363-55371
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IF 3.84
Wai Szeto,Jiantao Li,Haibao Huang,Jin Xuan,Dennis Y. C. Leung
Novel urchin-like microparticles with photocatalytic activity and magnetically separable properties were prepared by a layer-by-layer assembly process. Photocatalytic degradation was investigated using two types of mercury vapor lamps: an ozone generating lamp emitting at both 254 nm and 185 nm as well as a germicidal lamp emitting at 254 nm only. This novel photocatalyst demonstrated superior photocatalytic activity in the mineralization of phenol under UVC illumination compared with the commercial P25, Degussa TiO2, especially in repeated usage. Importantly, this photocatalyst can be quickly separated for reuse simply by using a magnet. The merits of 3D spiny nanostructured TiO2 microparticle photocatalysts are high specific surface area, good permeability, reduced charge recombination rate and high catalytic activity while the incorporation of magnetically separable properties enables rapid and easy retrieval of the suspended photocatalyst after use.
研究领域:
材料科学
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环境科学
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS IN CIVIL ENGINEERING
·
2024
·Vol. 36
·期 12
·04024404
·
IF 3.1
Jihong Jiang,Han Wang,Yanchun Miao,Xiaobin Dong,Yali Li,Zeyu Lu
Due to the large specific surface area and strong van der Waals force, bulk aggregation of nano-TiO2 immediately occurs when it is mixed with fresh cement mixture, limiting its reinforcing efficiency to cement-based materials. This study proposes a novel strategy to improve the mechanical and photocatalytic properties of cement mortar using nano-TiO2 hydrosol instead of conventional nano-TiO2 powder. Compared with pure mortar, the 28-day compressive and flexural strength of mortar with 0.6% by weight nano-TiO2 hydrosol were enhanced by 51% and 15%, respectively, the water absorption and chloride ion diffusion coefficient were decreased by 21% and 31%, respectively. The observed improvements were attributed to the denser microstructure and enhanced micromechanical properties in the bulk matrix and around interfacial transition zone (ITZ), resulting from the better dispersion of nano-TiO2 hydrosol in alkaline environment. In addition, compared with the mortar with nano-TiO2 powder, the degradation efficiency of Rhodamine B and NO by the mortar with nano-TiO2 hydrosol (0.6% by weight) was enhanced by 18.3% and 17.1% at 28 days, respectively. The enhancement resulted from the higher intrinsic photocatalytic activity and larger exposed surface area of nano-TiO2 hydrosol due to better dispersion. The research outcomes demonstrate the potential of using nano-TiO2 hydrosol in cement mortar to significantly increase the mechanical strength, durability, and photocatalytic activity, which can lead to the development of cement-based constructions with the integrated design of functionality and structure.
研究领域:
建筑材料
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环境工程
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纳米技术
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
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2018
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IF 4.439
Ayyakannu Sundaram Ganeshraja,Kaixin Zhu,Kiyoshi Nomura,Junhu Wang
The hierarchical silver chloride loaded tin-doped titania (AgCl@Sn-TiO 2 ) microspheres were first time prepared by a hydrothermal method and annealing at different temperatures. The catalyst showed the enhanced visible light photocatalytic activity as compared to the plasmonic photocatalysts of AgCl and Ag/AgCl, and commercial Degussa P25 (TiO 2 ). The improved efficiency is considered to local surface plasmonic resonance (AgCl could reduce to Ag 0 during photocatalytic reaction) in enhanced broad band visible light absorption in addition to the characteristics of heterojunction between Sn-TiO 2 and AgCl NPs. Moreover, the surface and bulk properties of as-synthesized samples were analyzed by 119 Sn Mössbauer spectroscopy. The magnetic property of the bulk was studied as a function of magnetic field with different temperatures. These results signify the clear details of the magnetic and visible light photocatalytic activities of hierarchical AgCl@Sn-TiO 2 microspheres.
研究领域:
材料科学
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环境科学
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纳米技术
✓ 已验证
DOI
高影响因子
ORGANIC ELECTRONICS
·
2018
·
IF 3.68
Yue Wang,Lijie Zhu,Tiening Wang,Yufeng Hu,Zhenbo Deng,Qiuhong Cui,Zhidong Lou,Yanbing Hou,Feng Teng
In this work, we synthesized ligand-free anatase TiO 2 nanocrystals with clean surface and excellent electron extraction. By introducing the trap states between the TiO 2 nanocrystals and the photoactive layer of poly (3-hexylthiophene) (P3HT): (phenyl-C61-butyric-acid-methyl-ester) (PC 61 BM) bulk heterojunction (BHJ), a high performance solution-processed broadband OPD in the visible wavelength is realized and characterized. The OPD shows near spectrally flat response from 350 to 650 nm with high EQE (113%), high responsivity (0.5 A/W) and high detectivity (1.9 × 10 12 Jones) at −1 V. The device also exhibits a high −3 dB bandwidth of 902 kHz and a respectable response speed with a rise time and fall time of 34 μs and 26 μs, respectively. The photocurrent retention measurement at a bias voltage of −1 V implies that the device photoresponse is significantly stable. These OPD performance parameters are sufficient for use in the machine vision or imaging systems. With the help of the J-V curves and light assisted C-V measurements, the underlying working mechanism is proposed as well.
研究领域:
材料科学
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光学工程
✓ 已验证
产品关联
DOI
高影响因子
Materials Research Express
·
2018
·Vol. 6
·期 3
·035503
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IF 1.151
Qiwei Shi,Jianxiong Liu,Jianzheng Zhen,Guanqun Zhang,Cheng Liu,Qi Cheng,Zhaolin Zhan
The precursor of Fe(OH)3, C and TiO2 was synthesized by a simple one-step hydrothermal method. Then, the of C in the composite was eliminated by calcination at 500 °C for 5 h in an air atmosphere. Thereby, a Fe2O3@TiO2 microspheres composite material is synthesized. The incorporation of Fe2O3 helps provide high specific capacity, high speed cycling and stable life performance. The first discharge capacity of Fe2O3@TiO2 microspheres is 688 mAh g−1, with higher discharge performance, higher reversible capacity and higher cycle performance. Moreover, the 2nd to 50th charge and discharge of Fe2O3@TiO2 microspheres, the capacitance retention rate exceeds 90%. The outstanding stable cycling and well rate performance suggest that Fe2O3@TiO2 microspheres have great potential to be applied as anode material for lithium ion batteries.
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
高影响因子
JOURNAL OF POWER SOURCES
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2019
·
IF 7.467
Fengyan Xie,Jingwei Zhu,Yafeng Li,Deli Shen,Antonio Abate,Mingdeng Wei
The electron transporting layer plays an important role in charge extraction and transporting procedure for mesoscopic perovskite solar cells. Herein, the TiO 2 -B nanoparticles are used as an electron transporting material in perovskite solar cells for the first time which achieves a high efficiency of 18.83%. Furthermore, the effects of TiO 2 -B electron transporting layer on the nature of perovskite adsorption layer and the photovoltaic properties of devices are investigated in detail. As a consequence, the high efficiency can be ascribed to perovskite layer with a high crystallinity , resulting in suppressing charge recombination at interfaces, leading to favourable energy level alignment between perovskite and TiO 2 -B.
研究领域:
材料科学
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能源科学
✓ 已验证
产品关联
DOI
高影响因子
RENEWABLE ENERGY
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2019
·
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
✓ 已验证
产品关联
DOI
高影响因子
Journal of Chemistry
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2019
·
IF 1.727
Fei Chang,Zhong Bing He,Quan Zhou
Four kinds of Al-TiO2 solid samples with different Ti/Al ratios of 1 : 0.1, 1 : 0.09, 1 : 0.07, and 1 : 0.05 were synthesized via a solid-phase synthesis method and characterized by XRD, SEM, EDS, BET, and other techniques. The prepared solids were used for separation of the bioderived product danshensu, the content of which was determined by UV spectrophotometry. Moreover, the effects of extract concentration, PH value, adsorption time, and ethanol elution volume were investigated. The results showed that these Al-TiO2 samples had good adsorption and desorption ability. Especially, the solid Al-TiO2 with a Ti/Al ratio of 1 : 0.05 is more suitable for the separation of danshensu, exhibiting a higher adsorption (77.70%) under 2 h adsorption time and pH = 3; meanwhile, the high desorption rate (70.29%）was received under 80% ethanol and the sample concentration of 3.0 mg/mL.
研究领域:
材料科学
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分析化学
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药学
✓ 已验证
产品关联
DOI
高影响因子
PROGRESS IN ORGANIC COATINGS
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2015
·
IF 2.358
Wenzhong Zhai,Zhan-Min Wu,Xiaowen Wang,Pengfei Song,Yufeng He,Rong-Min Wang
Using nano-TiO 2 as stabilizer, a novel waterborne antibacterial Pickering emulsion containing epoxy-acrylate copolymer@nano-TiO 2 composite particles (PkE@NT) has been successfully prepared via emulsion polymerization. The core–shell composite nanoparticles were characterized by dynamic light scattering (DLS), scanning electron microscope (SEM) and transmission electron microscopy (TEM), whose components were also confirmed by FT-IR and TGA. The mechanism of PkE@NT was suggested by monitoring the particle size changes in time. The average particle size was approximately 180 nm. Furthermore, water absorption of PkE@NT film got to 142 wt%, which showed good water absorption. The basic properties and antibacterial property of PkE@NT emulsion for interior coatings were also investigated. It showed that the emulsion had excellent adhesive force and antibacterial activity.
研究领域:
材料科学
·
生物学
✓ 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）