RSC Advances
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2017
·Vol. 7
·期 48
·30051-30059
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IF 3.108
Minghui Shang,Huilin Hou,Fengmei Gao,Lin Wang,Weiyou Yang
Photocatalytic hydrogen evolution is a promising solution to energy and environmental problems. The grand challenge for its application is how to make photocatalysts with satisfactory efficiency. In the present work, exploration of Ag@TiO2 mesoporous nanofibers via two strategies is reported, namely in situ electrospinning preparation (strategy I) and electrospinning combined with subsequent photodeposition (strategy II). The photocatalytic behavior of the as-synthesized Ag@TiO2 hybrid nanofibers was evaluated in terms of hydrogen evolution efficiency for the photodecomposition of water under Xe lamp irradiation. It was found that incorporation of Ag nanoparticles into the TiO2 mesoporous nanofibers could enhance remarkably their photocatalytic efficiency. The products prepared through strategy I exhibited the highest photocatalytic performance as compared with those prepared by strategy II. Current work might give some insight into exploration of stable binary photocatalysts, which have potential applications for efficient hydrogen evolution.
研究领域:
材料科学
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能源科学
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环境科学
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DOI
高影响因子
RSC Advances
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2017
·Vol. 7
·期 62
·39089-39095
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IF 3.108
Ying-Ying Shao,Wei-Dong Ye,Chun-Yan Sun,Chu-Lin Liu,Qi Wang
As typical persistent organic pollutants, polybrominated diphenyl ethers (PBDEs) have aroused high environmental concern because of their toxicity and recalcitrant degradation. Here we report the visible-light-induced degradation of PBDEs with AgI–TiO2 (>420 nm). A series of nano-structured AgI–TiO2 particles were synthesized by a deposition–precipitation method and characterized by SEM, TEM, XRD, XPS, BET and UV-Vis-DRS. The AgI–TiO2 hybrids showed high efficiency for degradation of PBDEs and excellent photostability in cyclic run experiments. The absorbance intensity and absorption ability of AgI–TiO2 hybrids and the properties of the solvents were found to greatly influence the efficiency of degradation of PBDEs. The 0.2-AgI–TiO2 (the mass ratio of Ag to P25 was about 20%) in CH3OH solution presented the highest reaction rate with 0.29 ± 0.02 h−1. Most interestingly, mechanistic pathways in the degradation of PBDEs were different under UV and visible light. Unlike the common single-electron transfer in the UV-TiO2 system, the debromination mechanism in the visible light/AgI–TiO2 system showed multi-electron transfer. The analysis of products showed that many different lower brominated congeners simultaneously appeared under visible light rather than being stepwise formed under UV. This implies that the special structure of AgI–TiO2 performs remarkably enhanced electron transfer, multi-electron transfer, and results in high photocatalytic activity. This research may provide a green and efficient method to remove halogenated pollutants by using visible light.
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
CERAMICS INTERNATIONAL
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2021
·
IF 4.527
Lele Zhou,Zhizhang Shen,Shuibing Wang,Junxian Gao,Lingling Tang,Ji Li,Yuming Dong,Zhenyu Wang,Jinze Lyu
We constructed quantum-scale catalytic regions on the surfaces of TiO 2 nanoparticles by loading TiO 2 quantum dots (QDs) with a two-step method. The removal rate and mineralization efficiency of toluene were measured and then used in evaluating the oxidation performance of the prepared samples. A home-built atmospheric surface photovoltage spectrometer and X-ray photoelectron spectrometer were used in analyzing band alignment across the interface between TiO 2 QD and TiO 2 particle and the transfer of charge carriers at the surface. Results showed that an upward band bending formed from the TiO 2 particle to the TiO 2 QD and promoted the accumulation of holes at the QD side. Moreover, the QD and surrounding substrate TiO 2 formed a quantum-scale catalytic region, improving the reaction probability of electron-hole pairs and corresponding intermediates. The mineralization efficiency of toluene in QD-loaded TiO 2 reached 95.8%. The synthetic method is green and simple, showing potential in scale production and industrial application.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
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2019
·Vol. 27
·期 15
·17446-17457
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IF 2.914
Gao Zhao,Yang Hanpei,Fu Xiaofei,Jin Qiu,Wu Qiangshun,Kang Li,Wu Junming
Slow and random transfer of pollutants and photo-induced carriers on photocatalysts causes loss of efficiency in photodegradation of contaminants. Enhancing and directing mass transfer of them are considered as two major methods for improving the photodegradation of pollutants over photocatalysts. Here in this work, we focused on the design of a novel photocatalyst which not only accelerated the transfer rate of Cr(VI) and electrons but also provided specific transfer routes for them. By careful characterizations, it is indicated that 2-((2-(2-aminoethylamino)ethylimino)methyl)phenol (AEMP) was covalently attached onto activated carbon (AC), which enhanced Cr(VI) transfer from bulk solution to AC through electrostatic or coordinative interactions. The external mass transfer coefficient ( K f ) of Cr(VI) over TiO 2 /AC-AEMP was estimated as 1.75 × 10 −6 m s −1 , which was ~ 12.79 and ~ 5.96 times that of TiO 2 and TiO 2 /AC, respectively. Dense and homogeneous heterojunctions between AC and TiO 2 were acquired synchronically by forming Ti–O–C linkages, which increased traveling of electrons from TiO 2 to AC. Accordingly, Cr(VI) can capture photo-induced electrons on the surface of AC via concrete routes and then be reduced efficiently. The results showed that the photoreduction rate of Cr(VI) on TiO 2 /AC-AEMP reached to ~ 92.7%, and the overall photocatalytic activity of this well-designed TiO 2 /AC-AEMP has been enhanced significantly by 5.5 times compared to TiO 2 /AC. The enhanced photocatalytic activity of TiO 2 /AC-AEMP was mainly attributed to an improved synergetic process of mass transfer–induced adsorption–photoreduction by forming specific transfer routes for accelerative motion of Cr(VI) and electrons. This work provides a feasible strategy to improve the photoactivity of photocatalysts for the degradation of pollutants by effective mass transfer.
Graphical abstract
研究领域:
环境科学
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材料科学
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DOI
PubMed
高影响因子
Analytical Methods
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2025
·
IF 2.6
Changqiu Ma,Daheng Jiang,Linghui Zeng,Lixin Zhu,Xiaoliang Xu
Conventional photoelectrochemical (PEC) biosensors based on ZnO and TiO2 face challenges in applications in vivo due to the poor penetration of excitation light through the skin. To address this limitation, we designed a novel near-infrared (NIR)-driven FTO@UC@Cu2O@TiO2 heterojunction biosensor for subcutaneous L-cysteine detection. NIR light penetrates the skin and excites the upconversion material (called UC for short, NaYF4:Er, Yb), which emits visible light at 540 nm. This emission activates the Cu2O semiconductor to generate photocurrent. The Cu2O@TiO2 heterojunction facilitates charge carrier separation and suppresses electron-hole recombination. The biosensor demonstrates stable, sensitive, and reproducible detection of L-cysteine over a range of 10 μM to 10 pM, with a detection limit of 5.2 pM. Notably, it also enables subcutaneous detection covering a range from 10 μM to 100 pM, with a detection limit of 74 pM. These results provide a promising strategy for real-time in situ monitoring of L-cysteine in clinical applications.
研究领域:
生物传感器
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纳米技术
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分析化学
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生物医学工程
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光化学
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DOI
PubMed
高影响因子
GREEN CHEMISTRY
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2020
·Vol. 23
·期 3
·1382-1388
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IF 9.48
Liang Chen,Yiming Huang,Ren Zou,Jiliang Ma,Yunyi Yang,Tingzhen Li,Mingsai Li,Qi Hao,Haibo Xie,Xinwen Peng
Synthesis of D-xylonic acid, a high value chemical feedstock, from biomass chemicals through a photocatalytic process is of great significance in respect of economical and sustainable concerns, and therefore has aroused considerable attention. Herein, a TiO2/Ti3C2(TT) photocatalyst was designed for the oxidation of xylose to D-xylonic acid under ambient conditions. The photocatalyst is fabricated by in situ growth of TiO2 nano-particles on Ti3C2 nanosheets and exhibits 64.2% of D-xylonic acid yield with excellent stability. The mechanistic study indicates that the electron transfer from TiO2 to Ti3C2 significantly increases the life time of light-induced charge carriers, and hence improved photocatalytic performance.
研究领域:
材料科学
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化学工程
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可持续化学
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光催化
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DOI
高影响因子
JOURNAL OF RARE EARTHS
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2021
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IF 3.712
Zhimin Zhao,Jinjia Liu,Gala Sa,Aiju Xu
In this study, the photocatalytic activity of Nd-TiO 2 photocatalysts obtained by common hydrothermal method was evaluated by practical experiments and theoretical calculations based on density functional theory (DFT). The synthesized photocatalysts were characterized by X-ray diffraction (XRD), N 2 adsorption–desorption, Fourier transform infrared spectroscopy (FT-IR), high resolution transmission electron microscopy (HRTEM), X-ray photoelectron spectroscopy (XPS), UV–Vis diffuse reflectance spectroscopy (DRS), and photoluminescence (PL) to study their physical/chemical properties. At the same time, the photoelectronic performance was also investigated. The photodegradation ability of as-prepared photocatalysts and the effect of Nd doped amount and photocatalysts dosage were investigated by the photodegradation of phenol (30 mg/L) under 400 W metal halide lamp (UV–Vis). The effect of Nd on electronic properties of TiO 2 and adsorption ability of phenol were discussed. Results show the red-shift wavelength of 0.5 mol%Nd-TiO 2 , indicating that its absorption capacity is stronger than pristine TiO 2 in the same wavelength range. The result of DFT calculations demonstrates that the optical bandgap of Nd-TiO 2 is profoundly reduced, thus the light absorption ability is promoted, which will be responsible for the enhanced photocatalytic performance of Nd-TiO 2 . 0.5 mol% Nd is an optimum value for photodegradation phenol, and phenol can be completely degraded by 0.5 mol%Nd-TiO 2 for 210 min, the higher catalytic performance is derived from the efficient separation of e – /h + pairs. Moreover, the adsorption energy calculations of phenol on TiO 2 (101) and Nd-TiO 2 (101) demonstrate that the Nd doping can significantly enhance the adsorption ability of phenol on catalyst surfaces because of the formation of Nd–O bonds. At last, the stability measurement through four recycles exhibits that 0.5 mol%Nd-TiO 2 possesses excellent stability.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
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2017
·Vol. 17
·期 2
·1204-1209
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IF 1.483
Zheng Yan,Wang Junpeng,Yang Ping
Anatase TiO2 with exposed {001} facets were synthesized via solvothermal method by using titanium (IV) butoxide as Ti source, hydrofluoric acid as capping agent and alcohol as solvent. Different alcohols such as methanol, ethanol, isopropyl alcohol, and n-butanol were investigated
systematically. As-prepared samples were characterized by X-ray diffraction, field emission scanning electron microscope and transmission electron microscope. The results indicated that regular TiO2 nanosheets were created from ethanol and isopropanol alcohol even though the size
and thickness changed. However, TiO2 nanosheets were attached together in methanol and n-butanol. The reasons of solvent effect the morphology and properties of TiO2 crystals exposed {001} facets have been discussed. The photocatalysis investigation of samples was carried
out by degradating methyl orange under ultraviolet light irradiation. TiO2 nanosheets obtained in ethanol solvent exhibited superior photocatalytic performance compared with other samples. The reasons could attribute to TiO2 nanosheets obtained in ethanol solvent with
higher specific surface area, mesoporous structure, and exposed highly active {001} facets.
研究领域:
材料科学
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环境科学
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DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
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2020
·
IF 6.182
Krishnamoorthy Rajavel,Shuyi Shen,Tao Ke,Daohui Lin
The present study addresses the establishment of a highly reactive catalyst derived from Ti 3 C 2 T x (MXene), which is a graphitic carbon-supported TiO 2 hybrid nanostructure for photocatalytic and bacteriostatic applications. The graphitic carbon-supported TiO 2 nanoparticles, which were placed onto a Ti 3 C 2 T x backbone as ternary hybrids under the controlled oxidation of isopropylamine delaminated Ti 3 C 2 T x , were demonstrated to be semiconducting nanostructures. Beneficially, the oxygen-related vacancies in TiO 2 along with graphitic carbon support in the metallic Ti 3 C 2 T x heterostructures exhibited distinct methylene blue dye degradation under UV irradiation at a rate constant of ( k ) of 0.035 ± 0.003 min −1 . The demonstrated superior catalytic performance of the assembled hybrid structure was attributed to the formation of multiple interfacial junctions formed by graphitic carbon, TiO 2 nanoparticles, and Ti 3 C 2 T x , which created distinct intermediate energy levels for electron-hole pair separation and improved the catalytic performance. The synthesized hybrid nanostructures also exhibited excellent antibacterial activity; approximately 97.4% of E. coli was killed by the nanostructures under light exposure due to the excessive radicals that caused oxidative stress on bacterial cells. The developed hybrid nanostructures from the controlled oxidation of delaminated Ti 3 C 2 T x are expected to be superior materials for photocatalytic and bacteriostatic applications.
研究领域:
材料科学
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环境科学
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微生物学
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DOI
高影响因子
MOLECULES
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2017
·Vol. 22
·期 11
·1943
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IF 2.861
Xiaojia Li,Mingming Zou,Yang Wang
Highly crystalline mesoporous anatase TiO2nanospheres with high surface area (higher than P25 and anatase TiO2) are prepared by a soft-template method. Despite the high specific surface area, these samples have three times lower equilibrium adsorption (<2%) than Degussa P25. The rate constant of the mesoporous anatase TiO2(0.024 min−1) reported here is 364% higher than that of P25 (0.0066 min−1), for the same catalytic loading. The results of oxidation-extraction photometry using several reactive oxygen species (ROS) scavengers indicated that mesoporous anatase TiO2generates more ROS than P25 under UV-light irradiation. This significant improvement in the photocatalytic performance of mesoporous spherical TiO2arises from the following synergistic effects in the reported sample: (i) high surface area; (ii) improved crystallinity; (iii) narrow pore wall thicknesses (ensuring the rapid migration of photogenerated carriers to the surface of the material); and (iv) greater ROS generation under UV-light.Keywords:mesoporous anatase TiO2;high surface area;photocatalytic
研究领域:
材料科学
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环境科学
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DOI
PubMed
高影响因子
ENERGY CONVERSION AND MANAGEMENT
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2023
·
IF 10.4
Huping Yan,Zhen Liu,Ronghui Qi
Utilizing ambient humidity to drive electron motion in nanomaterials and generate usable electricity is promising for self-powered electronics and sensors. This paper developed a humidity gradient-driven microgenerator (HGDM) by coating a cobalt hydrogel on part of the TiO 2 nanoparticle film and employing multi-walled carbon nanotubes as electrodes. The humidity gradient was established between the bottom hygroscopic hydrogel and the top electrode in contact with ambient air. Results demonstrated that the TiO 2 /Co hydrogel HGDMs can achieve an open-circuit voltage of 0.95 V at 20 °C and 50–80% relative humidity (RH). The single generator (size: 5 × 4 cm 2 ) exhibited a current output of approximately 0.1 mA, which remained stable for over 100 h with less than 1% decay. The increase in hydrogel films’ height first increased then decrease the performance, and the optimal value was provided. By alternately introducing 10% and 80% RH air humidity cycles, the generator responded rapidly with a wet/dry output ratio over 400, and the delay time maintained within 1.0 s after 1000 cycles. The output performance dropped severely when the air temperature was higher than 40 °C. In practical applications, a series of 5–7 micro-generators successfully delivered consistent power supply to LED lights and calculators for a duration exceeding one week, and the voltage output can be recovered to its initial value after less than 5 h of recharging. Mechanistic studies have revealed that the primary driving force for power generation is the humidity gradient rather than vapor evaporation. Because the diameter of the nanopores (around 200 nm) are much smaller than the Debye length of the double electric layer (960 nm), ion-selective permeability in TiO 2 nanochannels is also important which can prevent nearly 90% OH – from passing through the channels. This hydrogel microgenerator exhibits wide-ranging application prospects, and our study contributes to enhancing its performance and elucidating the mechanism.
研究领域:
材料科学
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能源技术
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DOI
高影响因子
ELECTROCHIMICA ACTA
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2017
·
IF 4.798
Qinghua Tian,Lingxiangyu Li,Li Yang,Jizhang Chen,Shin-ichi Hirano
With a much higher theoretical capacity than that of graphite anodes, SnO 2 has attained great attention as a potential anode material for next-generation lithium-ion batteries. However, it's practical application yet be impeded by such disadvantages of poor conductivity and terrible structure stability during repeated discharge/charge process. Herein, a unique TiO 2 /SnO 2 /C hybrid (TiO 2 SS@SnO 2 @C) consist of one-dimensional TiO 2 nanobelts , zero-dimensional SnO 2 nanoparticles and conformal carbon coating has been fabricated based on a strategy of synergistic effect of components with different dimensional nanostructures , which can provide improved electrochemical kinetic and outstanding structure stability for the TiO 2 SS@SnO 2 @C. As a result, the TiO 2 SS@SnO 2 @C is able to exhibit outstanding lithium storage performance as an anode material, delivering capacities of 904.9 and 492.4 mAhh g −1 after even 400 cycles at 200 and even 1000 mA g −1 , respectively. It is demonstrated that the synergistic effect of these components is responsible for thus outstanding electrochemical performance.
研究领域:
材料科学
·
能源存储
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DOI
高影响因子
危险品化学品经营许可证（带存储）