Journal of Environmental Chemical Engineering
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2024
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IF 7.4
Wenjin Ni,Sicheng Zhang,Lingling Cheng,Tiejun Luo,Hongyun Yang,Tengfei Duan,Dejian Yan
Developing efficient photoanodes for water oxidation is highly promising due to their critical role in producing green H 2 and harnessing solar energy. Herein, a metal-organic framework (MOF)/photoanode was successfully constructed by coating TiO 2 nanorods with MIL-88(Fe) MOF for photoelectrochemical (PEC) water splitting. The results demonstrated that MIL-88(Fe) was uniformly and tightly coated on TiO 2 and functioned as a cocatalyst. The MIL-88(Fe) MOF provides a large surface area and more Fe-O active sites, contributing to high PEC activity by reducing electron/hole recombination and enhancing light response capability. Moreover, the photoanode also exhibited an improved charge conductivity. As a result, the MIL-88(Fe)/TiO 2 photoanode exhibited an excellent photocurrent density of 1.06 mA cm −2 at 1.23 V RHE , which is approximately 2.6 times higher than the pristine TiO 2 . Charge transfer kinetics analyses and electrochemical tests were carried out and revealed that the improved PEC performance was attributed to the introduction of MIL-88(Fe), which promoted charge separation-transfer. This research provided new insights into the design of efficient semiconductor/MOF composite photoanodes for PEC water oxidation.
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
APPLIED SURFACE SCIENCE
·
2018
·
IF 4.439
Li Liu,Mengting Yue,Jinrong Lu,Jinshan Hu,Yinghua Liang,Wenquan Cui
This paper reports that hybrid titanium dioxide (TiO 2 ) packaged self-assembly perylenetetracarboxylic acid diimide (PTCDI) by self-assembly. These were synthesized through simple mechanical milling that has great photocatalytic performance under visible light . The PTCDI@TiO 2 composite had high activity for the degradation of phenol and 2,4-dichlorophenol, which were 2.3 and 3.2 times of the monomer PTCDI, respectively. After three cycles, the activity of the composite catalyst remained at 70%. Further analysis showed that the photocatalytic activity and stability are mainly due to the enhancement of the charge mobility by the π-π conjugated structure in PTCDI. Moreover, the good energy level matching between PTCDI and TiO 2 helps to separate the electron-hole, thus improving the photocatalytic performance of the composite. The origin of photocatalytic activity was greatly improved due to holes and O 2 − , which was mainly attributed to the strong interaction between PTCDI and TiO 2 .
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
Catalysis Science & Technology
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2020
·Vol. 10
·期 11
·3709-3719
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IF 5.721
Chengwei Qiu,Jinjin Lin,Jinni Shen,Dan Liu,Zizhong Zhang,Huaxiang Lin,Xuxu Wang
Anatase/rutile TiO2 heterophase junction composites have been documented to have much higher photocatalytic activity than single phase TiO2 (nude anatase or nude rutile) for various chemical reactions, including hydrogen production from methanol–water solution and pollution degradation. Further improving the photocatalytic performance of heterophase junction photocatalysts is a subject worth studying in both theory and practice. Based on the concept of junction interface regulation and our previous findings, we embedded Ni12P5 nanoparticles at the interface between anatase (A) and rutile (R) TiO2 by a multi-step preparation method to obtain an A/Ni12P5/R composite with a sandwich-like structure. It was found that loading Ni12P5 on the outside surface of anatase TiO2 (Ni12P5/A), rutile TiO2 (Ni12P5/R), P25 TiO2 (Ni12P5/P25), and A/R composite (Ni12P5/A/R) leads to a decrease in the photocatalytic activity; however, interestingly, the A/Ni12P5/R sample showed higher photocatalytic activity than the other samples of loaded or unloaded Ni12P5, although the loaded Ni12P5 in the latter case is inaccessible to the reactant molecules. This abnormal phenomenon can be attributed to two main reasons. (i) Ni12P5 as a metal-like material has a higher work function than anatase and rutile, which leads to the formation of Schottky junctions at the interface between the two intimately contacted phases. (ii) When Ni12P5 is located on the outside surface, the Schottky junction is unfavorable for the transfer of photogenerated electrons from TiO2 to Ni12P5. However, when Ni12P5 is sandwiched between A and R, the formation of a reverse tandem Schottky junction can facilitate the directed transfer of photogenerated electrons from R phase to A phase. This work again verifies that photocatalytic activity can be regulated and controlled by introducing metal and metal-like particles within the junction of a metal/semiconductor interface or even on a semiconductor/semiconductor interface. Our findings not only provide a novel usage of Ni12P5 as a co-photocatalyst but also deepens the understanding of the Schottky effect on the photocatalytic process.
研究领域:
材料科学
·
光催化
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2023
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IF 6.2
Tarek A. Gad-Allah,Ruiyang Zhang,Yi Wang,Ying Zhou
Various factors control the photocatalyst efficiency including the lifetime of photogenerated charge carriers, photocatalyst surface energy, and light harvesting efficacy. In this study, the defective (001)-TiO 2 -x/h-BN composite was synthesized by a facile one-pot method to merge the fantastic features of the reactive metastable (001) facet and self-defects in TiO 2 anatase crystals with the 2D h-BN. Pure anatase phase of TiO 2 was obtained by the suggested preparation method, which contains ∼33 % of the exposed (001) facet. The predominancy of oxygen vacancy in TiO 2 crystals was proved experimentally and theoretically by the DFT calculations. The defects in TiO 2 along with the incorporated h-BN caused better light harvesting and longer charge lifetime. The prepared defective (001)-TiO 2 -x/h-BN was applied efficiently for NO removal with very limited release of the toxic NO 2 by-product as an environmental application. The detected oxygen vacancy in TiO 2 along with h-BN were found to play a synergistic enhancement for NO removal. However, more defects reduced the overall activity because of rapid oxidation of oxygen vacancies on surface of the photocatalyst. To sum up, the defective (001)-TiO 2 -x/h-BN composite can be considered as a promising material for environmental applications.
研究领域:
环境科学
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材料科学
✓ 已验证
DOI
高影响因子
Journal of Physical Chemistry C
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2015
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IF 4.772
Yuangang Li,Rongrong Wang,Huajing Li,Xiaoliang Wei,Juan Feng,Kaiqiang Liu,Yongqiang Dang,Anning Zhou
Co-Pi decorated TiO2@graphitic carbon nitrides (g-C3N4) nanorod arrays (denoted as CCNRs) with different mass ratios of g-C3N4 have been constructed on the FTO substrate through three processes, hydrothermal growth, chemical bath deposition and electrodeposition. First, TiO2 nanorod arrays were grown onto a FTO substrate by a hydrothermal method. Second, g-C3N4 was coated onto the TiO2 nanorod arrays by immersing the above substrate with TiO2 nanorod arrays into a solution of urea and then heated at higher temperature. In this procedure, the amount of the g-C3N4 on the TiO2 nanorod arrays can be controlled by tuning the concentration of the urea solution. At last, Co-Pi were decorated on the surface of the TiO2@g-C3N4 by electrodeposition. The as-prepared CCNRs were characterized by XRD, FESEM, TEM, XPS, UV–vis, and FTIR, respectively, which illustrated that Co-Pi moieties were successfully decorated on the hybrid TiO2@g-C3N4 nanorod arrays. Photoelectrochemical (PEC) measurements have demonstrated that the prepared CCNRs serve as an efficient and stable photoanode for PEC seawater splitting. The photocurrent density reaches 1.6 mA/cm2 under 100 mW/cm2 (AM1.5G) light illumination at 1.23 V (RHE). More significantly, the CCNRs photoanode is quite stable during seawater splitting and the performance remain undiminished even after 10 h continuous illumination. Finally, a systematical photocatalytic mechanism of the Co-Pi decorated TiO2@g-C3N4 was proposed, and it can be considered as potential explanation of enhanced PEC performance.
研究领域:
材料科学
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化学
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
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2014
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IF 4.086
Bing-Xin Lei,Xiao-Feng Zheng,He-kang Qiao,Yi Li,Shu-Nuo Wang,Guo-Lei Huang,Zhen-Fan Sun
We report a novel hierarchical homogeneous nanoarchitecture of TiO 2 nanosheets branched TiO 2 nanosheet arrays, which is formed directly on transparent conductive fluorine-doped tin oxide (FTO) glass substrate through a one-step facile hydrothermal reaction without the use of a seed layer. The hierarchical homogeneous nanoarchitecture is composed of long TiO 2 nanosheet trunks grafted with a large number of TiO 2 nanosheet branches, which is an effective structure to improve the charge transport with the increase of the specific surface area. Dye-sensitized solar cell (DSSC) based on TiO 2 nanosheets branched TiO 2 nanosheet arrays can achieve an outstanding power conversion efficiency of 6.66%, which is attributed to the specific performances such as higher specific surface area for adsorbing more dye molecules, superior light scattering capacity for boosting the light-harvesting efficiency and faster charge transport for efficient charge collection.
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
INORGANIC CHEMISTRY COMMUNICATIONS
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2022
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IF 3.428
Zelin Li,Lu Bai,Zhiqiang Xing,Wenxiao Yang,Qiuhua Wu,Guolin Zhang
Hollow spheres (HSs) are widely used as nanoreactors and catalysts due to their significantly large surface area, low density and high loading capacity. In this paper, new composites with PNVCL on the interior surface of mesoporous TiO 2 hollow spheres (TiO 2 -HSs), which were named PNVCL@TiO 2 -HSs, were designed and prepared. After grafting PNVCL on TiO 2 -HSs, the light absorption range extended from less than 400 nm to less than 418 nm. Compared with traditional composites (TiO 2 -HSs@PNVCL), the new composites have good dispersibility in water at a wide temperature range. Thus PNVCL@TiO 2 -HSs can be used as photocatalysts and showed higher catalytic activity in photocatalytic degradation of Rhodamine B (RB) and Acid Red 57 (AR57) in wastewater. ·OH radicals were confirmed to be the main active species and played a dominant role in the degradation, and the photocatalytic mechanism was discussed. The new composites provided new insights for exploring more diversified grafting methods.
研究领域:
材料科学
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环境科学
·
化学工程
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2015
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IF 4.321
Jing Di,Shixiong Li,Zhefei Zhao,Yicao Huang,Yi (Alec) Jia,Huajun Zheng
Two kinds of CNT@TiO 2 biomimetic composites with needle-leaved (NL) and broad-leaved (BL) trees morphology were synthesized respectively by a simple one-step solvothermal method for the first time. The TiO 2 leaves located on CNT stems act as active sites for photocatalysis. The method allows one to prepare the composites with distinguish morphology of TiO 2 leaves by adjusting the mass ratio of CNT and TiO 2 . In the photodegradation test of methylene orange, the reaction rate up to eightfold increment was observed with both the biomimetic composites compared to bare TiO 2 . The improved photocatalytic activity could be owed to two aspects, namely the enhanced light trapping and scattering ability benefited from large specific area and the direct transport pathway for electrons conducted by CNT, which all derive from the advantages of the unique tree-like structure. This work presents a new strategy to synthesize hetero-photocatalysts with maximized light-harvesting efficiency and low electron hole recombination rate concurrently. These results demonstrate the great potential of biomemic composites and would stimulate further research in photocatalysis and related areas.
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 MATERIALS SCIENCE
·
2020
·Vol. 55
·期 24
·10399-10411
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IF 3.553
Yang Wangyang,Shen Honglie,Min Huihua,Ge Jiawei
The application of TiO 2 acetone monitor is highly limited by the high operating temperature and poor sensitivity. In this work, black TiO 2 (B-TiO 2 ) is produced by Ti 3+ self-doping and is followed by Ag modification to form B-TiO 2 @Ag. It is first demonstrated that the operating temperature and sensitivity of TiO 2 to acetone can be promoted evidently. By introducing a Ti 3+ self-doped layer on the surface of TiO 2 , as observed in TEM images, the band gap of TiO 2 is reduced to 3.01 eV. Ag surface decoration is carried out for the enhancement of electron generation. Optical absorption and the Hall effect results prove that B-TiO 2 @Ag exhibits highest photoelectrical properties. As a result, the B-TiO 2 @Ag gas sensor with a low operating temperature at 250 °C and high response of 68.19 to 50 ppm acetone is realized. The low detection limit of B-TiO 2 @Ag sensor reaches 887 ppb, which provides an applicable way for non-invasive detection of blood glucose.
研究领域:
材料科学
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传感技术
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生物医学工程
✓ 已验证
DOI
高影响因子
OPTICAL MATERIALS
·
2022
·
IF 3.754
Jian Lin,Yulian Tao,Jialiang Liu,Chan Zheng,Xiaoyi Song,Pingqiang Dai,Qianting Wang,Wei Li,Wenzhe Chen
Photocatalytic micromotors hold considerable promise for use in water remediation owing to the synergistic effect of a combination of photocatalytic activity and self-propulsive behavior. We designed a symmetric TiO 2 @carbon microsphere (CMS) core–shell micromotor with photocatalytic TiO 2 for enhanced degradation of organic contaminants. TiO 2 @CMS micromotors were obtained via a facile sol–gel method and subsequent heat treatment to obtain an anatase TiO 2 shell. The self-propulsion of TiO 2 @CMS micromotors is governed by asymmetric decomposition of H2O2 via asymmetric illumination of the spherical particles. The photocatalytic propulsion can be switched on and off by modulating the incident light. The speed of the photocatalytic TiO 2 @CMS core–shell micromotors can be increased by increasing either the light intensity or concentration of the chemical fuel, i.e., H 2 O 2 . In the degradation of rhodamine B, the photocatalytic performance of the micromotors was higher than those achieved with control group photocatalysts . The degradation efficiency reached ∼100% in approximately 60 min when all necessary conditions, i.e., use of micromotors, UV irradiation, and H 2 O, were applied. TiO 2 @CMS core–shell micromotors have the advantages of facile preparation, a simple structure, self-propulsion, and a high degradation efficiency and photocatalytic performance. They will therefore be important in the development of methods for water purification and wastewater treatment.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF PHOTOENERGY
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2019
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IF 2.026
Manqing Ai,Wenli Qin,Tian Xia,Ying Ye,Xuegang Chen,Pingping Zhang
Novel nanocomposites have been prepared by intercalating TiO2 nanoparticles into talc. The nanocomposites have been verified by X-ray diffraction (XRD) from the appearance of a characteristic diffraction peak of TiO2. Thermal behavior of the prepared samples is examined by thermogravimetric analyzer (TGA), scanning electron microscope (SEM), and energy dispersive spectrometer (EDS), which have shown no TiO2 particles on the surface of the talc. The TiO2 particles are found in the layers of talc by transmission electron microscopy (TEM) and the Brunauer-Emmett-Teller (BET) method, which have shown the increase of specific surface areas and total pore volumes and the decline of average pore diameters. As the strong adsorption ability of talc can intensify the power of photon absorption and capture-recombination carriers, more than 99.5% of 2,4-dichlorophenol can be degraded in 1 h by the nanocomposite under an ultraviolet lamp in neutral solution and room temperature after reaching adsorption equilibrium, and the result of adsorbance is in accord with the first-order kinetic. The degradation rate was maintained at about 99% after 20 times. Therefore, the prepared talc/TiO2 nanocomposite is an efficient, stable, and recyclable material for wastewater treatment.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Junlei Wang,Xueqin Wang,Qihui Chen,Helong Xu,Man Dai,Mei Zhang,Wenyi Wang,Hua Song
The microstructure of photocatalysts plays a key role in enhancing their photocatalytic performance. Herein, resorcinol/formaldehyde (RF) polymer resin was prepared using the extended Stöber process and used for hard templates. Hollow TiO 2 spheres (HTS) were synthesized via hydrolysis of a versatile kinetics-controlled coating and carbonization method. The physicochemical properties of as-prepared catalysts were characterized. The pure RF template had a uniform diameter of ~450 nm. By adjusting the ammonia dosage from 0.1 to 0.35 mL, monodisperse RF@TiO 2 spheres were obtained with a porous TiO 2 shell of ~25–160 nm in thickness. The concentration of ammonia had a significant effect on the micromorphology, and hence, the photocatalytic properties of the HTS. The Brunauer-Emmett-Teller surface area and pore volume were ~30 m 2 /g and 0.082 cm 3 /g, respectively. The intrinsically high conductivity of the HTS microspheres and their high surface area resulting from this robust hollow structure was beneficial for photocatalytic performance toward phenol decomposition.
研究领域:
材料科学
·
环境科学
✓ 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）