CHINESE JOURNAL OF CATALYSIS
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2023
·
IF 16.5
Defa Liu,Bin Sun,Shuojie Bai,Tingting Gao,Guowei Zhou
Solar-powered semiconductor photocatalysis is considered a powerful strategy for addressing environmental pollution and energy crisis. Nevertheless, the separation and transfer abilities of photogenerated photocatalysts remain unsatisfactory. Herein, dual Ti 3 C 2 nanosheets/Ag co-catalysts synergistically decorated hierarchical flower-like TiO 2 microspheres for boosting photocatalytic H 2 production were fabricated by electrostatic self-assembly and subsequent photoreduction procedures. The optimal Ag/Ti 3 C 2 /TiO 2 composite demonstrated an excellent photocatalytic H 2 -production rate of 1024.72 μmol g −1 h −1 under simulated solar irradiation, achieving nearly 40, 2.3, and 1.8 folds with respect to that obtained on pristine TiO 2 , optimized Ti 3 C 2 /TiO 2 composite, and Ag/TiO 2 composite, respectively. The considerably improved photocatalytic H 2 -production activity is associated with the synergistic effect of the hierarchical flower-like structure of TiO 2 , excellent electrical conductivity of Ti 3 C 2 , and surface plasmon resonance effect of Ag, which enhances the light absorption capacity and promotes the separation and transfer of photogenerated carriers. This study provides insight into the design of high-efficiency photocatalysts with dual co-catalysts for solar H 2 production.
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
ACS Applied Bio Materials
·
2019
·
IF 0
Huifan Li,Jiahui Zhong,Huijuan Zhu,Yuping Yang,Mengna Ding,Liulin Luo,Yuning Huo,Hexing Li
The hybrid Cu2O-TiO2 photocatalytic composite with a p-n heterojunction was synthesized by the supercritical solvothermal route. The uniformly distributed Cu2O was stably combined with TiO2 to benefit the increase of the specific surface area, the harvesting of visible light, and the separation of photogenerated holes and electrons. As a result, photocatalytic inactivation of Acinetobacter baumannii under visible-light irradiation was facilitated. Based on the photogenerated holes acting as the main active species, the Cu2O-TiO2 photocatalytic heterojunction could induce the leakage of K+ ions and serious damage of the cell structure, leading to the final cell death. During the photoantibacterial process on Cu2O-TiO2, the RecA gene played a significant role in enhancing the survival rate of Acinetobacter baumannii. Furthermore, the great bactericidal effect of Cu2O-TiO2 nanocomposites to different bacteria indicated the potential application for the environment-friendly disinfection.
研究领域:
微生物学
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环境科学
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材料科学
✓ 已验证
DOI
PubMed
ACS Sustainable Chemistry & Engineering
·
2025
·
IF 7.3
Haodong Zhang,Min Chen,Weiming Qian,Jianghao Zhang,Xueyan Chen,Xiaoxiao Qin,Minmin Liang,Changbin Zhang
The hydrogenation of CO2 to produce valuable chemicals through photocatalytic or photothermal technologies represents a viable path toward carbon neutrality. However, typical nanosemiconductor materials, such as TiO2, often exhibit limited activity, necessitating the optimization of their performance as a key research priority. Here, we demonstrate that the size of anatase TiO2 significantly influences its performance in the selective photocatalytic and photothermal reduction of CO2 to CO. The small-sized TiO2 (S-TiO2, 15 nm) exhibits a low CO yield of 32.7 μmol g–1 h–1 and shows almost no photothermal synergy. In contrast, the large-sized TiO2 (L-TiO2, 160 nm) demonstrates a high CO yield of 185.3 μmol g–1 h–1 and significant photothermal synergy, with the CO yield reaching 438.7 μmol g–1 h–1. We reveal that L-TiO2 is well-crystallized and has a higher conduction band position compared to the S-TiO2. This results in a higher charge separation efficiency and more effective photoexcited electrons for CO2 reduction. Additionally, the external heating primarily enhances the charge separation in L-TiO2, significantly improving the conversion of CO2 to CO. This work provides insights into the relationship between the structure and activity of TiO2 in photocatalytic and photothermal CO2 reduction.
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
DOI
高影响因子
CELLULOSE
·
2021
·Vol. 28
·期 8
·4959-4973
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IF 5.044
Wang Dong,Lin Junkang,Huang Jianhua,Zhang Hui,Lin Shan,Chen Lihui,Ni Yonghao,Huang Liulian
A major obstacle for the development of the cellulose-based nanofiltration membrane is its fouling. In this study, a novel cellulose-based composite nanofiltration membrane (CS/DA-TiO 2 -NFM) with excellent anti-fouling performance was prepared through casting of both chitosan (CS) and TiO 2 modified by dopamine (DA-TiO 2 ) on the cellulose substrate membrane. DA-TiO 2 was successfully introduced into the surface of membrane, resulting in significant improvement in its hydrophilicity due to the formation of dense CS layers. Furthermore, both CS and DA-TiO 2 were effective antimicrobial agents (against E. coli 90.6% and S. aureus 95.1%) that could minimize the accumulation of bacteria on the CS/DA-TiO 2 -NFM. For the antifouling test against BSA, the irreversible recovery ratio of the CS/DA-TiO 2 -NFM was only 23.25% of the control (no CS/DA-TiO 2 modified NFM). In addition, the CS/DA-TiO 2 -NFM exhibited an increased rejection rate of MgSO 4 (enhanced 40.93%) and water-flux (enhanced 18.10%) compared with the control. These results highlight the potential of the presented approach for designing membranes with effective separation performance and antifouling for drinking water treatment. Graphic abstract
研究领域:
材料科学
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环境科学
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生物学
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
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2012
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IF 2.103
Fajia Liu,Hu Liu,Xiaoyun Li,Huanyu Zhao,Danping Zhu,Yingying Zheng,Chaorong Li
The antibacterial and photocatalytic PVC film was prepared by doping heteronanostructure of TiO 2 nanowire@Ag nanoparticles. TiO 2 nanowire with 50–60 nm in diameter and 0.1 mm in length was prepared by a hydrothermal method, and Ag nanopartical about 5–10 nm in diameter was grafted on the surface of TiO 2 nanowire evenly in the solution. The antimicrobial ability and the photocatalytic properties of the nano-TiO 2 @Ag/PVC film were systematically investigated by changing the influence factors such as the content of nano-TiO 2 @Ag, pH value and the cultivation condition. It confirmed that the nano-TiO 2 @Ag nanostructure could increase the antibacterial efficiency of the PVC film. Further, nano-TiO 2 @Ag/PVC film also showed enhanced photocatalytic activity to decompose Rhodmine B (RhB).
研究领域:
材料科学
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微生物学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
Progress in Natural Science-Materials International
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2012
·
IF 1.099
Delong Li,Chunxu Pan
A process to fabricate a kind of novel micro–nano scaled TiO 2 /CuS composite fibers by electrospinning technique and chemical precipitation method was developed in the present study. The microstructures and photoelectronic properties of the fibers were characterized using SEM, FT-IR, UV–vis and fluorescence spectroscopy. The results revealed that the TiO 2 portion in the composite fibers was a mixture rutile and anatase phases while TiO 2 and CuS had been fully composite. The fibers had smooth surface with a diameter of 50–300 nm. Comparing with pure TiO 2 fiber, the TiO 2 /CuS micro–nano-scaled composite fibers exhibited a strong absorption in the visible light region and the efficiency of photo-induced charge separation were enhanced. This composite system is of widely potential applications in the areas such as solar cells, supercapacity, photocatalysis, etc.
研究领域:
材料科学
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纳米技术
✓ 已验证
产品关联
DOI
高影响因子
PROGRESS IN ORGANIC COATINGS
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2018
·
IF 2.955
Hongxia Wang,Jun Qian,Houbin Li,Fuyuan Ding
Traditional ink owning harmful components has caused many problems, so this paper developed chitosan-TiO 2 edible inks and used it as the model to study the relationship between rheology and printing, for better development of edible inks. Rheological properties and the corresponding fitting were investigated. The developed ink exhibited non-Newtonian behavior, shear-thinning behavior, and temperature-dependent properties. Shear strain, frequency and temperature had great impact on modulus of inks. Low J ( t ) (compliance) values reflected strong material structure and the related final recovery ratio attained 65.9%. Based on the fitting results, the screen-printing simulation were further researched for closer practical application. The recovery rate reached 55% with high initial recovery coefficient (K 3 = 10.7), indicating that the ink recovered sooner to the high viscosity after the shear was released and was suitable for printing. The ink was also printed on coated paper. Fastness was up to 91% and scratch resistance achieved H. The print effect on black cardboard and PET film was also excellent. The prepared edible ink provides a novel alternative to traditional ink and holds great potential in printing industry, especially on food.
研究领域:
食品科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2013
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IF 3.777
Lin Gao,Xiangru Li,Hao Hu,Guojian Li,Haowen Liu,Ying Yu
A facile solvothermal treatment without any template is employed to synthesize TiO 2 mesoporous microspheres with nanorod structure. The post-calcination of the microsphere sample at 500 °C with carbon source leads to the formation of C-coated TiO 2 with the same structure . All of the prepared samples have been characterized by the techniques of X-ray diffraction, scanning electron microscopy and transmission electron microscopy. Additionally, N 2 adsorption-desorption isotherm curves have been depicted to show the tunable mesopores and high specific surface area of the prepared pure and C-coated TiO 2. A growth scheme is also proposed to elucidate the formation process of the mesoporous microspheres with nanorods on the surface. The electrochemical results show that both of the prepared samples have better electrochemical performance than commercial anatase TiO 2 due to the nanorod and mesoporous structures, which provides direct and open channals for efficient Li + ion diffusion. Moreover, the prepared C-coated TiO 2 has superior rate property and cycling performance with specific capacity of 157.4 mAh g −1 at 1C rate even after 200 cycles. The galvanostatic charge-discharge voltage indicates that the C-coated TiO 2 with improved electronic conductivity has the broadest voltage platform comparable to Li 4 Ti 5 O 12 . Therefore, the C-coated TiO 2 with mesoporous microspheres and nanorod structure can be an attractive candidate as functional anode materials.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING SCIENCE
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2018
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IF 3.306
Qing Li,Xiaofang Zhu,Ying Zhang,Zhigang Zak Fang,Shili Zheng,Pei Sun,Yang Xia,Ping Li,Yang Zhang,Xing Zou
Hydrogen assisted magnesiothermic reduction (HAMR) of TiO 2 is a promising new process developed recently to produce Ti metal with low cost and less energy consumption. This work focuses on the understanding and optimization of the reduction process to control the quality of the reduced product. TiO 2 precursor particles with different relative densities were prepared, and the effects of the relative densities on reduction by Mg in H 2 were studied. The changes of oxygen contents vs. reduction time at various temperatures were investigated. The phase transformations during the reduction were analyzed both theoretically and experimentally. The relationship between the morphology of the reduced products and the relative densities of the TiO 2 precursors was analyzed by SEM characterization and the likely reason for the morphology evolution was discussed.
研究领域:
材料科学
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冶金工程
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产品关联
DOI
高影响因子
Materials Chemistry Frontiers
·
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
·
太阳能转换
✓ 已验证
DOI
高影响因子
Russian Journal of Physical Chemistry A
·
2023
·Vol. 97
·期 12
·2786-2791
·
IF 0.7
Yu Hongchao,Zhang Mengmeng,Jin Tianxiang
Abstract A unique heterostructure of Ag/TiO 2 nanofibers (denoted as Ag/TiO 2 NFs) have been fabricated by a facile electrospinning technique with subsequent annealing. The loading amount of the Ag nanoparticles can be conveniently tailored by adjusting the concentration of the Ag precursor. The resulting samples were characterized by different techniques such as SEM, TEM, XRD, UV–Vis diffuse reflectance spectra and XPS. Photoelectrochemical performances were also tested under full spectrum light illumination and the results demonstrated that Ag nanoparticles provided efficient separation of photogenerated electron–hole pairs and made for the enhancement of photocatalytic activity in comparison with pure TiO 2 nanofibers. Furthermore, the optimum matching between the Ag and TiO 2 for the best photoelectrochemical activity was investigated and a reasonable mechanism was also proposed.
研究领域:
材料科学
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环境科学
·
光催化技术
✓ 已验证
DOI
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2020
·
IF 3.408
Ningxiao Gao,Tingting Wan,Zhiyang Xu,Liansheng Ma,Seeram Ramakrishna,Yong Liu
Photoanode optimization of the dye-sensitized solar cell is a crucial part of its performance improvement. In this study, graphene-containing TiO 2 nanofibers were prepared by electrospinning, and the nitrogen element was doped via the hydrothermal method . After that, a nitrogen-graphene co-doped TiO 2 nanofiber photoanode was prepared using a doctor blade coating process . Micromorphological characterization revealed that nitrogen and graphene were successfully doped into composite nanofibers with favorable morphology and distribution. Ultraviolet–visible light spectroscopy and monochromatic light conversion efficiency data demonstrated that the doping of nitrogen enhanced the cell's response to sunlight. The J-V curve was obtained under solar simulation, and the conversion efficiency of 5.01% was reached, which was 26% higher than that of undoped. Therefore, the co-doped composite fiber makes a promising prospect for further applications.
研究领域:
材料科学
·
能源科学
✓ 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）